SN2025imw: What Happened, Distance & Viewing Guide

Q: What type of supernova is SN2025imw and what kind of star exploded?

SN2025imw is spectroscopically classified as a Type Ia supernova, consistent with a thermonuclear explosion involving a carbon-oxygen white dwarf. Type Ia events are used as distance indicators via empirical relations such as the Phillips relation, but that cosmological utility does not identify which binary channel (single-degenerate accretion, double-degenerate merger, or sub-Chandrasekhar detonation) produced this object.

Q: What was the progenitor star doing in the millions of years leading up to SN2025imw?

No unique progenitor history is established for SN2025imw. Type Ia spectral classification is consistent with a thermonuclear explosion of a carbon-oxygen white dwarf, but it does not identify which binary pathway produced this event. Leading models include single-degenerate accretion toward the Chandrasekhar mass, double-degenerate white-dwarf mergers, and sub-Chandrasekhar helium-shell detonations. Distinguishing these requires population statistics, early-time spectra, or remnant searches that are not established for this individual object. Claims that this white dwarf accreted for millions of years, or that it approached 1.4 solar masses, are general theory—not documented facts about SN2025imw.

Q: How far away is SN2025imw from Earth and how old is the light reaching us?

SN2025imw has a luminosity distance of approximately 283.7 Million Light-Years (redshift z = 0.02, d_L = 86.97). Under a flat ΛCDM cosmology (H₀≈70 km/s/Mpc, Ωₘ≈0.3), the corresponding lookback time is ≈275 Myr — when the light set out 275.4 million years ago during the Paleozoic era, long before the first dinosaurs appeared on Earth. Luminosity distance is larger than the light-travel distance because cosmic expansion stretches the path; the two must not be equated.

Q: What does the cosmological redshift of SN2025imw tell us about the expansion of space?

SN2025imw exhibits a measured spectroscopic redshift of z = 0.0200. The cockpit reports a user-facing recession velocity of 5,935.9 km/s, computed as the redshift Doppler-equivalent v = c·((1+z)²−1)/((1+z)²+1). Cosmological redshift is not generally equivalent to special-relativistic motion through space; this number is a convenient velocity label for z, not a measured peculiar velocity and not supernova ejecta speed. Bare c·z (≈5,996 km/s) is a different low-z approximation and is not mixed here.

Q: How bright did SN2025imw become at its peak, and how many Suns does that equal?

Observed (single-epoch) magnitude of SN2025imw is 19.26 (cyan) on 2025/04/27 (MJD 60792.1). A single calibrated detection is not evidence of a peak; no rise, decline, or light curve can be established from one point. An absolute magnitude of -15.44 mag can be quoted only if distance is independently known.

Q: How fast are the supernova ejecta and shockwave of SN2025imw expanding through space?

No ejecta velocity is measured for SN2025imw. Blast-wave speed is obtained from Doppler shifts of spectral absorption features (e.g. Si II λ6355 for Type Ia), not from cosmological redshift. Any recession velocity derived from z describes Hubble flow, not the explosion debris. Type Ia events typically show ejecta speeds of order ~11,000 km/s near maximum, but that class scale is not a measurement of SN2025imw.

Q: What chemical elements did SN2025imw create and disperse into the universe?

Type Ia explosions are efficient producers of iron-peak elements via thermonuclear burning. Models typically yield substantial ⁵⁶Ni (which decays to stable ⁵⁶Fe), plus silicon, sulfur, calcium, and related species—consistent with the Si II features used in classification. No object-specific nucleosynthetic yield has been published for SN2025imw; asserting that this event synthesized half a solar mass of iron would overstate the evidence.

Q: Did SN2025imw leave behind a black hole, a neutron star, or nothing at all?

Nothing remains at the center. Because a Type Ia supernova involves the total thermonuclear disruption of the progenitor white dwarf, the entire star was incinerated and flung into space. There is no central neutron star, pulsar, or black hole left behind. The star's entire mass now exists as an expanding gaseous shell traveling through the host galaxy.

          🔭 Deep Field (~2.1′ FOV) · DSS2 Optical (China-VO mirror)
        

● SN2025imw Explosion Site

High-magnification deep optical view into SN2025imw's host environment. Pan and scroll to explore the cosmic neighborhood where this star exploded.

⚡ Quick Observer Facts & Telemetry

IAU Transients DB

🌐 Distance to Earth

283.7 Million Light-Years

Lookback Cosmic Time

✨ Peak Brightness

Mag 19.26 (cyan)

Large Observatory

☀️ Peak Radiance

128.2 million Suns

Combined Stellar Energy

🚀 Shock Velocity

Not measured

No spectral ejecta velocity

🌌 Host Galaxy

Field Transient Host

Center Coincident

🧭 Constellation

Capricornus

The Sea Goat

💥 Explosion Physics

Type Ia

Thermonuclear White Dwarf

📅 Discovered On

2025/04/27

J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)

CHAPTER I

A Type Ia Thermonuclear Explosion

On 2025/04/27, astronomers scanning the heavens flagged a sudden, violent pinpoint of light that had flared into visibility. Designated SN2025imw, it represents a catastrophic stellar explosion classified as a Type Ia supernova.

SN2025imw is spectroscopically classified as Type Ia, consistent with a thermonuclear white-dwarf explosion in an unidentified host environment. Competing progenitor channels (single-degenerate accretion, double-degenerate merger, sub-Chandrasekhar detonations) remain open; an individual accretion history toward the Chandrasekhar mass is not established for this event.

Astrophysical Mechanism Summary

Type: Type Ia • Progenitor: Carbon-Oxygen White Dwarf (Binary System) • Velocity: Not measured

CHAPTER II

A Message Across Deep Cosmic Time

SN2025imw has a luminosity distance of approximately 283.7 Million Light-Years (redshift z = 0.02). That figure is not the light-travel time: under flat ΛCDM the lookback time is ≈275 Myr, when the light set out 275.4 million years ago during the Paleozoic era, long before the first dinosaurs appeared on Earth.

Luminosity distance incorporates cosmic expansion and exceeds the light-travel distance. The two quantities must be reported separately.

CHAPTER III

Incandescence of 128.2 million Suns

An observed magnitude of 19.26 (cyan) is on record around 2025/04/27 (MJD 60792.1), with absolute magnitude -15.44 mag. A single detection is not evidence of a peak.

The total energy released by the cataclysm was on the order of 10⁵¹ to 10⁵³ ergs. Virtually all of this was deposited into the kinetic shockwave and radioactive nucleosynthesis.

CHAPTER IV

The Radioactive Furnace: Why Supernovae Glow for Months

After peak, many supernovae are powered by the radioactive chain ⁵⁶Ni → ⁵⁶Co → ⁵⁶Fe. That is the standard model for Type Ia light curves; an object-specific nickel mass for SN2025imw is not published here.

Nickel-56 decays to Cobalt-56 (half-life ≈6.1 days), then to stable Iron-56 (half-life ≈77.2 days), heating the ejecta from within. Typical class yields must not be quoted as measured values for this event.

CHAPTER V

Cosmic Kiln: Seeding the Elements of Life

Supernovae enrich galaxies with heavy elements. Events of SN2025imw's class are associated with iron-peak and intermediate-mass products (Ni/Fe, Si, S, Ca) in galactic chemical-evolution models. No measured elemental yields are published for SN2025imw.

As Carl Sagan observed, "We are made of star-stuff" — a statement about nucleosynthesis in general, not a claim that atoms from this specific remnant are identified in the Solar System.

CHAPTER VI

Galactic Setting in Capricornus

No host galaxy is identified for SN2025imw in this catalog record . In our terrestrial sky, it resides in the constellation Capricornus (The Sea Goat) at Right Ascension 20:40:42.867 and Declination -20:26:08.31.

CHAPTER VII

The Scientific Surveillance Campaign

Following its discovery by J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU), observatories worldwide swung their lenses toward SN2025imw. In the sne.space, SN2025imw is documented across 1 photometric measurements in passbands such as cyan and 0 spectroscopic epochs. These multi-wavelength observations allow astrophysicists to model the expanding photosphere, measure shock velocities, and probe circumstellar interactions.

CHAPTER VIII

Stargazer's Field Guide: Can You See It Tonight?

Can I see it tonight? Unknown — single-epoch observation only.

Discovered 567 days ago (2025/04/27). Observed magnitude m = 19.26 on 2025/04/27 (MJD 60792.1). A single photometry point is not evidence of a peak, rise, or decline.

Current brightness: No reliable current brightness estimate.

Instrument Class & Aperture	Sensitivity Limit	Observed Single-Epoch Detection (m=19.26 on 2025/04/27 (MJD 60792.1))	Current Brightness Tonight
Naked Eye Dark sky site (Bortle 1–3) with no optical aid	m ≤ 6.0	Requires larger aperture (limit m ≤ 6.0)	No reliable estimate
Binoculars (50mm) Standard 7x50 or 10x50 handheld binoculars	m ≤ 9.5	Requires larger aperture (limit m ≤ 9.5)	No reliable estimate
Small Backyard Scope (4" / 100mm) Entry 4-inch (100mm) refractor / reflector	m ≤ 12.0	Requires larger aperture (limit m ≤ 12.0)	No reliable estimate
Medium Amateur Scope (8"–12") 8-inch to 12-inch Dobsonian or Schmidt-Cassegrain	m ≤ 14.5	Requires larger aperture (limit m ≤ 14.5)	No reliable estimate
Amateur CMOS Rig Cooled monochrome/color CMOS camera with multi-hour stack	m ≤ 19.5	✅ Reachable	No reliable estimate
2m–3m Research Telescope University or regional observatory (e.g. Palomar 60", Calar Alto)	m ≤ 22.0	✅ Reachable	No reliable estimate
Giant 8m–10m Observatories Keck (10m), VLT (8.2m), Gemini, Subaru optical imaging	m ≤ 25.0	✅ Reachable	No reliable estimate
Space Observatories Only Hubble Space Telescope (WFC3) / JWST (NIRCam deep stack)	m ≤ 30.0	✅ Reachable	No reliable estimate

Planetary Safety Note: Even though SN2025imw was a titanic explosion, our planet sits safely outside the lethal 50–100 light-year kill zone. At a distance of 283.7 Million Light-Years, the blast poses zero physical hazard to Earth's biosphere.

🌌 Cosmic Neighbors & Contemporaries 105,868+ transients indexed

Cataloged transients closest to SN2025imw in discovery time, spatial sky neighborhood, and cosmological redshift:

⏱️ Closest in Time

SN2025imc Exploded same day

Type Ia 2025/04/27

SN2025ime Exploded same day

Type Ia 2025/04/27

SN2025imr Exploded same day

Type SLSN-I 2025/04/27

🔭 Closest on the Sky

LSQ14dlu 4.3′ away

Type Ia Discovered 2014/07/18

AT2021sbj 10.6′ away

Type Candidate Discovered 2021/07/01

PS15brg 18.9′ away

Type Transient Discovered 2015/08/10

🌌 Same Cosmic Era (Redshift)

SN1993Y z = 0.02

Type Ia ~274.0 Mly (approx.)

SN1997du z = 0.02

Type II ~274.0 Mly (approx.)

SN1996M z = 0.02

Type II ~274.0 Mly (approx.)

❓ Frequently Asked Questions About SN2025imw

Scientific & observational Q&As indexed from astronomical databases & the sne.space

What type of supernova is SN2025imw and what kind of star exploded? Astrophysics & Progenitor

SN2025imw is spectroscopically classified as a Type Ia supernova, consistent with a thermonuclear explosion involving a carbon-oxygen white dwarf. Type Ia events are used as distance indicators via empirical relations such as the Phillips relation, but that cosmological utility does not identify which binary channel (single-degenerate accretion, double-degenerate merger, or sub-Chandrasekhar detonation) produced this object.

What was the progenitor star doing in the millions of years leading up to SN2025imw? Astrophysics & Progenitor

No unique progenitor history is established for SN2025imw. Type Ia spectral classification is consistent with a thermonuclear explosion of a carbon-oxygen white dwarf, but it does not identify which binary pathway produced this event. Leading models include single-degenerate accretion toward the Chandrasekhar mass, double-degenerate white-dwarf mergers, and sub-Chandrasekhar helium-shell detonations. Distinguishing these requires population statistics, early-time spectra, or remnant searches that are not established for this individual object. Claims that this white dwarf accreted for millions of years, or that it approached 1.4 solar masses, are general theory—not documented facts about SN2025imw.

How far away is SN2025imw from Earth and how old is the light reaching us? Cosmic Distance & Time

SN2025imw has a luminosity distance of approximately 283.7 Million Light-Years (redshift z = 0.02, d_L = 86.97). Under a flat ΛCDM cosmology (H₀≈70 km/s/Mpc, Ωₘ≈0.3), the corresponding lookback time is ≈275 Myr — when the light set out 275.4 million years ago during the Paleozoic era, long before the first dinosaurs appeared on Earth. Luminosity distance is larger than the light-travel distance because cosmic expansion stretches the path; the two must not be equated.

What does the cosmological redshift of SN2025imw tell us about the expansion of space? Cosmic Distance & Time

SN2025imw exhibits a measured spectroscopic redshift of z = 0.0200. The cockpit reports a user-facing recession velocity of 5,935.9 km/s, computed as the redshift Doppler-equivalent v = c·((1+z)²−1)/((1+z)²+1). Cosmological redshift is not generally equivalent to special-relativistic motion through space; this number is a convenient velocity label for z, not a measured peculiar velocity and not supernova ejecta speed. Bare c·z (≈5,996 km/s) is a different low-z approximation and is not mixed here.

How bright did SN2025imw become at its peak, and how many Suns does that equal? Explosion Energetics

Observed (single-epoch) magnitude of SN2025imw is 19.26 (cyan) on 2025/04/27 (MJD 60792.1). A single calibrated detection is not evidence of a peak; no rise, decline, or light curve can be established from one point. An absolute magnitude of -15.44 mag can be quoted only if distance is independently known.

How much total energy was released by SN2025imw, and where did that energy go? Explosion Energetics

Type Ia events are typically associated with a kinetic energy scale of order 10⁵¹ ergs, with little neutrino emission compared to core-collapse. That is a class expectation—not a calorimetry measurement for SN2025imw.

How fast are the supernova ejecta and shockwave of SN2025imw expanding through space? Explosion Energetics

No ejecta velocity is measured for SN2025imw. Blast-wave speed is obtained from Doppler shifts of spectral absorption features (e.g. Si II λ6355 for Type Ia), not from cosmological redshift. Any recession velocity derived from z describes Hubble flow, not the explosion debris. Type Ia events typically show ejecta speeds of order ~11,000 km/s near maximum, but that class scale is not a measurement of SN2025imw.

What powers the prolonged glow of SN2025imw weeks and months after detonation? Radioactive Engine

After peak, Type Ia light curves are generally powered by the radioactive chain ⁵⁶Ni → ⁵⁶Co → ⁵⁶Fe (half-lives ≈6.1 d and ≈77.2 d). Typical Type Ia events synthesize of order half a solar mass of freshly made Nickel-56 (which later decays into Iron-56); that is a class expectation, not a measured nickel mass for SN2025imw. Estimating M(⁵⁶Ni) for this object requires a bolometric light-curve fit that is not published here.

What chemical elements did SN2025imw create and disperse into the universe? Nucleosynthesis & Elements

Type Ia explosions are efficient producers of iron-peak elements via thermonuclear burning. Models typically yield substantial ⁵⁶Ni (which decays to stable ⁵⁶Fe), plus silicon, sulfur, calcium, and related species—consistent with the Si II features used in classification. No object-specific nucleosynthetic yield has been published for SN2025imw; asserting that this event synthesized half a solar mass of iron would overstate the evidence.

Did SN2025imw leave behind a black hole, a neutron star, or nothing at all? Cosmic Remnant

Nothing remains at the center. Because a Type Ia supernova involves the total thermonuclear disruption of the progenitor white dwarf, the entire star was incinerated and flung into space. There is no central neutron star, pulsar, or black hole left behind. The star's entire mass now exists as an expanding gaseous shell traveling through the host galaxy.

What will SN2025imw's explosion site look like in 1,000 to 10,000 years? Cosmic Remnant

Supernova remnants in general evolve through free-expansion, Sedov–Taylor, and radiative phases over centuries to millennia, sometimes becoming bright X-ray shells and occasionally compressing nearby molecular clouds. These are standard remnant-evolution models, not forecasts measured for SN2025imw. Whether this site will trigger star formation, reach particular X-ray temperatures, or match Cassiopeia A depends on local density and magnetic field—none of which are constrained by the data shown here.

In which galaxy did SN2025imw explode, and where is it located relative to the galactic center? Galactic Environment

No host galaxy is identified for SN2025imw in this catalog record. A blank host field means the association is unresolved here—it does not establish that the host is uncataloged, resolved in imaging, or securely linked by astrometry. Possible states (unidentified, hostless candidate, imaging detection without a catalog name, or a securely matched cataloged galaxy) require separate evidence that is not present in this field.

Where is SN2025imw located in the night sky and which constellation is it in? Sky Coordinates

In the celestial sphere, SN2025imw is located at Right Ascension 20:40:42.867 and Declination -20:26:08.31, situated in the constellation Capricornus (The Sea Goat). Because its declination is -20:26:08.31, it is favorably placed for Southern Hemisphere observatories.

How much Milky Way interstellar dust obscures our view of SN2025imw? Interstellar Dust

Along this line of sight, the catalog records a Milky Way foreground color excess of E(B−V) = 0.0601 mag (source: Analytical Galactic Disk Model (IAU)), corresponding to roughly A_V ≈ 0.19 mag for R_V = 3.1. Band-specific corrections (e.g. A_r) differ from A_V and should be applied when available. Map-based values (IRSA / Schlafly & Finkbeiner 2011) must not be claimed unless that map was actually queried.

Across which photometric filter bands was SN2025imw monitored? Astronomical Observations

SN2025imw has 1 calibrated photometric detection on record in cyan from ATLAS. A single point is not a light curve: no rise, peak, or decline rate can be measured until additional epochs are published.

What did astronomical spectroscopy reveal about SN2025imw's chemical makeup? Astronomical Observations

No spectrum has been published for SN2025imw. Without spectroscopy, its chemical composition, expansion velocity, and physical classification cannot be established. Classification spectra from follow-up observatories would be required to identify diagnostic absorption and emission lines.

Who discovered SN2025imw and how was it first detected? Discovery & History

SN2025imw was officially reported on 2025/04/27 by J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU). Discoveries are typically flagged by high-cadence robotic survey telescopes (such as ATLAS, ZTF, Pan-STARRS, ASAS-SN, or Gaia) and worldwide amateur astronomers scanning the night sky, followed by rapid spectroscopic classification by international observatories.

How many scientific publications and observatories have contributed data to SN2025imw? Scientific Research

SN2025imw is documented across 3 scientific references and archival data sources in the sne.space. These include discovery circulars and research datasets from Transient Name Server, 2025TNSTR1548....1T, The Open Supernova Catalog. All raw photometry and spectroscopy points are cross-indexed to their original bibliographic records for peer-reviewed verification.

What other names and survey identifiers exist for SN2025imw? Cross-Identifications

Throughout global alert streams and survey databases, SN2025imw has also been designated as: 2025imw, PS25czr, AT2025imw, GOTO25cec, ATLAS25eib, SN 2025imw, ZTF25aaqhkyi, BGEM J204042.84-202608.3, MASTER OT J204042.89-202609.1. These cross-matched identifiers allow astronomers to cross-reference observations across the Zwicky Transient Facility (ZTF), the Asteroid Terrestrial-impact Last Alert System (ATLAS), Pan-STARRS, Gaia Photometric Science Alerts, and the IAU Transient Name Server (TNS).

How does SN2025imw contribute to measuring the Hubble Constant and the scale of the cosmos? Cosmology & Distance Ladder

Because SN2025imw is a Type Ia supernova, it serves as an indispensable rung on the Cosmic Distance Ladder. Astrophysicists utilize the Phillips relation—a tight empirical correlation between peak absolute magnitude and light curve decline rate (Δm₁₅)—to standardize its luminosity. By comparing this calibrated intrinsic brightness with observed apparent magnitude, researchers calculate precise geometric distances across the universe, providing key empirical tests of the Hubble constant (H₀) and dark energy.

Could gravitational waves or neutrinos from SN2025imw be detected on Earth? Multi-Messenger Astronomy

For thermonuclear explosions like SN2025imw, gravitational wave and neutrino emissions are negligible compared to core-collapse events. However, multi-messenger radio and X-ray observations are crucial: detecting synchrotron radio emission would reveal circumstellar gas shed by a companion star, helping settle the century-old debate between single-degenerate and double-degenerate white dwarf progenitor channels.

How does SN2025imw compare to famous historical supernovae like SN 1987A or the Crab Supernova? Historical Comparison

Compared to historical landmarks like SN 1987A in the Large Magellanic Cloud (168,000 light-years away, naked-eye peak m = 2.9) or the Crab Supernova of 1054 (6,500 light-years away), SN2025imw occurred at a distance of 283.7 Million Light-Years. While historical naked-eye supernovae occurred within our Milky Way or its immediate satellites, modern discoveries like SN2025imw allow astrophysicists to probe diverse galactic environments, metallicities, and stellar populations across the broader universe.

Can I see SN2025imw tonight with a backyard telescope or binoculars? Backyard Observation

Unknown — no measured brightness. SN2025imw was discovered 567 days ago (2025/04/27), but no calibrated photometry is published for it, so its current apparent magnitude cannot be stated. Without a magnitude there is no basis for a telescope-aperture recommendation. Use the coordinates and airmass chart above to plan a follow-up observation and report what you measure.

Does the radiation or shockwave from SN2025imw pose any threat to Earth? Planetary Safety

No, Earth is in zero danger. Supernovae are violent events emitting powerful gamma rays, X-rays, and cosmic rays; however, the astrophysical 'lethal kill zone' for our planet's protective ozone layer is estimated at 50 to 100 light-years. At a distance of 283.7 Million Light-Years, the inverse-square law dilutes the radiation by quintillions of times, making SN2025imw completely harmless to our biosphere and purely a fascinating spectacle for human exploration.

Data sourced from IAU TNS, ALeRCE, WISeREP, and the sne.space. View All General Astrophysics FAQs →

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The Story of Supernova SN2025imw