69 citations · 202 across the 16 of their papers we have counts for
19 papers
Deciphering the Physical Origin of GRB 240825A: A Long GRB Lacking a Bright Supernova
Rahul Gupta, Judith L. Racusin, R. Sanchez-Ramirez +54
We present a comprehensive multiwavelength analysis of GRB 240825A, a bright gamma-ray burst (GRB) detected by Fermi and Swift, with a prompt duration ( 4 sec in…
An in-depth study of Gamma rays from the Starburst Galaxy M 82 with VERITAS
Atreya Acharyya, Colin B. Adams, Priyadarshini Bangale +60
Assuming Galactic cosmic rays originate in supernovae and the winds of massive stars, starburst galaxies should produce very-high-energy (VHE; E100 GeV) gamma-ray emission via t…
Multiwavelength Afterglow Analysis of GRB 221009A: Unveiling the Evolution of a Cooling Break in a Wind-like Medium
Donggeun Tak, Z. Lucas Uhm, Gregory S. H. Paek +8
Gamma-ray bursts (GRBs) are the most energetic explosions in the universe, and their afterglow emission provides an opportunity to probe the physics of relativistic shock waves in…
GRB 221009A: the B.O.A.T Burst that Shines in Gamma Rays
M. Axelsson, M. Ajello, M. Arimoto +151
We present a complete analysis of Fermi Large Area Telescope (LAT) data of GRB 221009A, the brightest Gamma-Ray Burst (GRB) ever detected. The burst emission above 30 MeV detected…
Impact of Ejecta Temperature and Mass on the Strength of Heavy Element Signatures in Kilonovae
Donggeun Tak, Z. Lucas Uhm, James H. Gillanders
A kilonova, the electromagnetic emission produced by compact binary mergers, is formed through a delicate interplay of physical processes, involving r-process nucleosynthesis and i…
Exploring the Impact of Ejecta Velocity Profile on Kilonova Evolution: Diversity of the Kilonova Lightcurves
Donggeun Tak, Z. Lucas Uhm, James H. Gillanders
A kilonova is a short-lived explosive event in the universe, resulting from the merger of two compact objects. Despite its importance as a primary source of heavy elements through…
Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS
A. Acharyya, A. Archer, P. Bangale +51
Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) a leading dark matter candidate. WIMPs have not been detected in…
VERITAS and Fermi-LAT constraints on the Gamma-ray Emission from Superluminous Supernovae SN2015bn and SN2017egm
A. Acharyya, C. B. Adams, P. Bangale +56
Superluminous supernovae (SLSNe) are a rare class of stellar explosions with luminosities ~10-100 times greater than ordinary core-collapse supernovae. One popular model to explain…
Temporal and Spectral Evolution of Gamma-ray Burst Broad Pulses: Identification of High Latitude Emission in the Prompt Emission
Donggeun Tak, Z. Lucas Uhm, Judith Racusin +5
We perform a detailed analysis on broad pulses in bright Gamma-ray bursts (GRBs) to understand the evolution of GRB broad pulses. Using the temporal and spectral properties, we tes…
Evidence of High-latitude Emission in the Prompt Phase of GRBs: How Far from the Central Engine are the GRBs Produced?
Z. Lucas Uhm, Donggeun Tak, Bing Zhang +5
One of the difficulties in nailing down the physical mechanism of gamma-ray bursts (GRBs) comes from the fact that there has been no clear observational evidence on how far from th…
Current and future gamma-ray searches for dark-matter annihilation beyond the unitarity limit
Donggeun Tak, Matthew Baumgart, Nicholas L. Rodd +1
For decades, searches for electroweak-scale dark matter (DM) have been performed without a definitive detection. This lack of success may hint that DM searches have focused on the…
Probing the multiwavelength emission scenario of GRB 190114C
Marc Klinger, Donggeun Tak, Andrew M. Taylor +1
Multiwavelength observation of the gamma-ray burst, GRB 190114C, opens a new window for studying the emission mechanism of GRB afterglows. Its Very-High-Energy (VHE; …
Multi-Resolution HEALPix Maps for Multi-Wavelength and Multi-Messenger Astronomy
I. Martinez-Castellanos, Leo P. Singer, E. Burns +4
HEALPix -- the Hierarchical Equal Area isoLatitude Pixelization -- has become a standard in high-energy and gravitational wave astronomy. Originally developed to improve the effici…
Improving the low-energy transient sensitivity of AMEGO-X using single-site events
I. Martinez-Castellanos, H. Fleischhack, C. Karwin +14
AMEGO-X, the All-sky Medium Energy Gamma-Ray Observatory eXplorer, is a proposed instrument designed to bridge the so-called "MeV gap" by surveying the sky with unprecedented sensi…
VTSCat - The VERITAS Catalog of Gamma Ray Observations
Sameer Patel, Gernot Maier, Philip Kaaret
We present a catalog of results of gamma-ray observations made by VERITAS, published from 2008 to 2020. VERITAS is a ground based imaging atmospheric Cherenkov telescope observator…
Bright gamma-ray flares observed in GRB131108A
Donggeun Tak, Z. Lucas Uhm, Bing Zhang
GRB 131108A is a bright long Gamma-Ray Burst (GRB) detected by the Large Area Telescope and the Gamma-ray Burst Monitor on board the Fermi Gamma-ray Space Telescope. Dedicated temp…
Multiple Components in the Broadband -ray Emission of the Short GRB 160709A
Donggeun Tak, Sylvain Guiriec, Z. Lucas Uhm +3
GRB 160709A is one of the few bright short gamma-ray bursts detected by both the Gamma-ray Burst Monitor and the Large Area Telescope on board the - $Te…
Closure relations of Gamma Ray Bursts in high energy emission
Donggeun Tak, Nicola Omodei, Z. Lucas Uhm +3
The synchrotron external shock model predicts the evolution of the spectral () and temporal () indices during the gamma-ray burst (GRB) afterglow for different environmental…
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow
M. Ajello, M. Arimoto, M. Axelsson +147
We report on the observations of gamma-ray burst (GRB) 190114C by the Fermi Gamma-ray Space Telescope and the Neil Gehrels Swift Observatory. The early-time observations reveal mul…