M. M. Kasliwal
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View article: A Luminous and Hot Infrared through X-Ray Transient at a 5 kpc Offset from a Dwarf Galaxy
A Luminous and Hot Infrared through X-Ray Transient at a 5 kpc Offset from a Dwarf Galaxy Open
We are searching for hot, constant-color, offset optical flares in the Zwicky Transient Facility data stream that are >10″ from any galaxy in public imaging data from the PanSTARRS survey. Here, we present the first discovery from this sea…
View article: Characterizing EP241107a: multiwavelength observations of an <i>Einstein Probe</i> -detected fast X-ray transient
Characterizing EP241107a: multiwavelength observations of an <i>Einstein Probe</i> -detected fast X-ray transient Open
Fast X-ray transients (FXTs) represent a new class of highly luminous transients in soft X-rays ($\sim$0.3–10 keV) associated with violent astrophysical processes. They manifest as short, singular flashes of X-ray photons with durations la…
View article: A Panchromatic View of Late-time Shock Power in the Type II Supernova 2023ixf
A Panchromatic View of Late-time Shock Power in the Type II Supernova 2023ixf Open
We present multiwavelength observations of the Type II supernova (SN II) 2023ixf during its first 2 yr of evolution. We combine ground-based optical/near-infrared spectroscopy with Hubble Space Telescope far- and near-ultraviolet spectrosc…
View article: An optical-to-infrared study of type II SN 2024ggi at nebular times
An optical-to-infrared study of type II SN 2024ggi at nebular times Open
We present 0.3–21 μm observations at ∼275 d and ∼400 d of type II supernova (SN) 2024ggi that combined ground-based optical and near-infrared data from the Keck I/II telescopes and space-based infrared data from the James Webb Space Telesc…
View article: Optically Overluminous Tidal Disruption Events: Outflow Properties and Implications for Extremely Relativistic Disruptions
Optically Overluminous Tidal Disruption Events: Outflow Properties and Implications for Extremely Relativistic Disruptions Open
Recent studies suggest that tidal disruption events (TDEs) with off-axis jets may manifest as optically overluminous events. To search for jet signatures at late times, we conducted radio observations of eight such optically overluminous (…
View article: The Slow Brightening of WNTR23bzdiq/WTP19aalzlk: Possible Onset of Common Envelope Evolution in an Asymptotic Giant Branch Star?
The Slow Brightening of WNTR23bzdiq/WTP19aalzlk: Possible Onset of Common Envelope Evolution in an Asymptotic Giant Branch Star? Open
We present WNTR23bzdiq/WTP19aalzlk, a slow eruption of an early-asymptotic giant branch (AGB) star in M31 identified by the Wide-field Infrared Transient Explorer near-infrared (NIR) and the NEOWISE mid-infrared (MIR) surveyors. This sourc…
View article: OpenUniverse2024: a shared, simulated view of the sky for the next generation of cosmological surveys
OpenUniverse2024: a shared, simulated view of the sky for the next generation of cosmological surveys Open
The OpenUniverse2024 simulation suite is a cross-collaboration effort to produce matched simulated imaging for multiple surveys as they would observe a common simulated sky. Both the simulated data and associated tools used to produce it a…
View article: AppleCiDEr II: SpectraNet -- A Deep Learning Network for Spectroscopic Data
AppleCiDEr II: SpectraNet -- A Deep Learning Network for Spectroscopic Data Open
Time-domain surveys such as the Zwicky Transient Facility (ZTF) have opened a new frontier in the discovery and characterization of transients. While photometric light curves provide broad temporal coverage, spectroscopic observations rema…
View article: Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors
Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors Open
GRB 250702B was the longest gamma-ray burst ever detected, with a duration that challenges standard collapsar models and suggests an exotic progenitor. We collected a rich set of optical and infrared follow-up observations of its rapidly f…
View article: Very Late-time JWST and Keck Spectra of the Oxygen-rich Supernova 1995N
Very Late-time JWST and Keck Spectra of the Oxygen-rich Supernova 1995N Open
We present new JWST/MIRI Medium Resolution Spectroscopy and Keck spectra of SN 1995N obtained in 2022–2023, more than 10,000 days after the supernova (SN) explosion. These spectra are among the latest direct detections of a core-collapse S…
View article: SN 2023xgo: Helium-rich Type Icn or Carbon-Flash Type Ibn supernova?
SN 2023xgo: Helium-rich Type Icn or Carbon-Flash Type Ibn supernova? Open
We present observations of SN 2023xgo, a transitional Type Ibn/Icn SN, from −5.6 to 63 days relative to r-band peak. Early spectra show C iii λ5696 emission like Type Icn SNe, shifting to Type Ibn features. The He i velocities (1800-10000 …
View article: Kilonova Constraints for the LIGO/Virgo/KAGRA Neutron Star Merger Candidate S250206dm: GW-MMADS Observations
Kilonova Constraints for the LIGO/Virgo/KAGRA Neutron Star Merger Candidate S250206dm: GW-MMADS Observations Open
Gravitational-wave (GW) neutron star mergers with an associated electromagnetic counterpart constitute powerful probes of binary evolution, the production sites of heavy elements, general relativity, and the expansion of the Universe. Only…
View article: The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system
The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system Open
AT2022rze is a luminous, ambiguous transient located south-east of the geometric centre of its host galaxy at redshift $z = 0.08$. The host appears to be formed by a merging galaxy system. The observed characteristics of AT2022rze are remi…
View article: A real-time search for Type Ia Supernovae with late-time interactions with circumstellar material in ZTF data
A real-time search for Type Ia Supernovae with late-time interactions with circumstellar material in ZTF data Open
While it is generally accepted that Type Ia supernovae (SNe Ia) are the terminal explosions of white dwarfs (WDs), the nature of their progenitor systems and the mechanisms that lead up to these explosions remain widely debated. In rare ca…
View article: SN 2023uqf: An Interacting Supernova Coincident with a High-Energy Neutrino
SN 2023uqf: An Interacting Supernova Coincident with a High-Energy Neutrino Open
Astrophysical high-energy (TeV-PeV) neutrinos were first discovered in 2013, but their origin remains largely unknown. Here we present SN 2023uqf, a supernova found in coincidence with high-energy neutrino IC231004A, as part of a systemati…
View article: A Luminous Red Optical Flare and Hard X-Ray Emission in the Tidal Disruption Event AT 2024kmq
A Luminous Red Optical Flare and Hard X-Ray Emission in the Tidal Disruption Event AT 2024kmq Open
We present the optical discovery and multiwavelength follow-up observations of AT 2024kmq, a likely tidal disruption event (TDE) associated with a supermassive ( M BH ∼ 10 8 M ⊙ ) black hole in a massive galaxy at z = 0.192. The optical li…
View article: EP250108a/SN 2025kg: A Jet-driven Stellar Explosion Interacting with Circumstellar Material
EP250108a/SN 2025kg: A Jet-driven Stellar Explosion Interacting with Circumstellar Material Open
We present optical, radio, and X-ray observations of EP250108a/SN 2025kg, a broad-line Type Ic supernova (SN Ic-BL) accompanying an Einstein Probe (EP) fast X-ray transient at z = 0.176. EP250108a/SN 2025kg possesses a double-peaked optica…
View article: Applying multimodal learning to Classify transient Detections Early (AppleCiDEr) I: Data set, methods, and infrastructure
Applying multimodal learning to Classify transient Detections Early (AppleCiDEr) I: Data set, methods, and infrastructure Open
Modern time-domain surveys like the Zwicky Transient Facility (ZTF) and the Legacy Survey of Space and Time (LSST) generate hundreds of thousands to millions of alerts, demanding automatic, unified classification of transients and variable…
View article: Limits on the ejecta mass during the search for kilonovae associated with neutron star-black hole mergers: A case study of S230518h, GW230529, S230627c and the low-significance candidate S240422ed
Limits on the ejecta mass during the search for kilonovae associated with neutron star-black hole mergers: A case study of S230518h, GW230529, S230627c and the low-significance candidate S240422ed Open
Neutron star-black hole (NSBH) mergers, detectable via their gravitational-wave (GW) emission, are expected to produce kilonovae (KNe). Four NSBH candidates have been identified and followed-up by more than fifty instruments since the star…
View article: Efficacy of Galaxy Catalogues for following up gravitational wave events
Efficacy of Galaxy Catalogues for following up gravitational wave events Open
The detection of gravitational waves (GW) by the LIGO-Virgo-KAGRA (LVK) network has opened up a new era in astrophysics. The identification of the electromagnetic counterparts of GW sources is crucial for multi-messenger astronomy, one way…
View article: Twin peaks: SN 2021uvy and SN 2022hgk in the landscape of double-peaked stripped envelope supernovae
Twin peaks: SN 2021uvy and SN 2022hgk in the landscape of double-peaked stripped envelope supernovae Open
In recent years, a class of stripped-envelope supernovae (SESNe) showing two distinct light-curve peaks has emerged, where the first peak cannot be attributed to shock cooling emission. Such peculiar SNe are often studied individually, exp…
View article: WINTER on S250206dm: A Near-infrared Search for an Electromagnetic Counterpart to a Gravitational-wave Event
WINTER on S250206dm: A Near-infrared Search for an Electromagnetic Counterpart to a Gravitational-wave Event Open
We present near-infrared follow-up observations of the International Gravitational Wave Network event S250206dm with the Wide-Field Infrared Transient Explorer (WINTER). Near-infrared observations are a critical component of electromagneti…
View article: Optimal Follow-up of Gravitational-wave Events with the UltraViolet EXplorer (UVEX)
Optimal Follow-up of Gravitational-wave Events with the UltraViolet EXplorer (UVEX) Open
The UltraViolet EXplorer (UVEX) is a wide-field ultraviolet space telescope selected as a NASA Medium-Class Explorer mission for launch in 2030. UVEX will undertake deep, cadenced surveys of the entire sky to probe low mass galaxies and ex…
View article: Low-Luminosity Type IIP Supernovae from the Zwicky Transient Facility Census of the Local Universe. II: Lightcurve Analysis
Low-Luminosity Type IIP Supernovae from the Zwicky Transient Facility Census of the Local Universe. II: Lightcurve Analysis Open
The Zwicky Transient Facility Census of the Local Universe survey yielded a sample of 330 Type IIP supernovae (SNe) with well-constrained peak luminosities. In paper I (arXiv:2502.19493), we measured their luminosity function and volumetri…
View article: Cryoscope: A Cryogenic Infrared Survey Telescope in Antarctica
Cryoscope: A Cryogenic Infrared Survey Telescope in Antarctica Open
We present Cryoscope, a new 50 deg 2 field-of-view, 1.2 m aperture, K dark survey telescope to be located at Dome C, Antarctica. Cryoscope has an innovative optical–thermal design wherein the entire telescope is cryogenically cooled. Cryos…
View article: Inferring CSM properties of Type II SNe using a magnitude-limited ZTF sample
Inferring CSM properties of Type II SNe using a magnitude-limited ZTF sample Open
Although all Type II supernovae (SNe) originate from massive stars possessing a hydrogen-rich envelope, their light-curve morphology is diverse, reflecting poorly characterized heterogeneity in the physical properties of their progenitor s…
View article: JWST/MIRI Observations of Newly Formed Dust in the Cold, Dense Shell of the Type IIn SN 2005ip
JWST/MIRI Observations of Newly Formed Dust in the Cold, Dense Shell of the Type IIn SN 2005ip Open
Dust from core-collapse supernovae (CCSNe), specifically Type IIP supernovae (SNe IIP), has been suggested to be a significant source of the dust observed in high-redshift galaxies. CCSNe eject large amounts of newly formed heavy elements,…
View article: The <tt>BTSbot-nearby</tt> Discovery of SN 2024jlf: Rapid, Autonomous Follow-up Probes Interaction in an 18.5 Mpc Type IIP Supernova
The BTSbot-nearby Discovery of SN 2024jlf: Rapid, Autonomous Follow-up Probes Interaction in an 18.5 Mpc Type IIP Supernova Open
We present observations of the Type IIP supernova (SN) SN 2024jlf, including spectroscopy beginning just 0.7 days (∼17 hr) after first light. Rapid follow-up was enabled by the new BTSbot-nearby program, which involves autonomously trigger…