R. Mukherjee
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View article: HAWC, VERITAS, Fermi-LAT, and XMM-Newton Follow-up Observations of the Unidentified Ultra-high-energy Gamma-Ray Source LHAASO J2108+5157
HAWC, VERITAS, Fermi-LAT, and XMM-Newton Follow-up Observations of the Unidentified Ultra-high-energy Gamma-Ray Source LHAASO J2108+5157 Open
We report observations of the ultra-high-energy gamma-ray source LHAASO J2108+5157, utilizing VERITAS, HAWC, Fermi-LAT, and XMM-Newton. VERITAS has collected ∼40 hr of data that we used to set ULs to the emission above 200 GeV. The HAWC da…
View article: Multiwavelength Study of HESS J0632+057: New Insights into Pulsar–Disk Interaction
Multiwavelength Study of HESS J0632+057: New Insights into Pulsar–Disk Interaction Open
We present an analysis of new multiwavelength observations of the TeV gamma-ray binary HESS J0632+057, conducted using SALT, Swift, NuSTAR, and VERITAS in 2023–2024. By combining these new data with archival observations, we confirm previo…
View article: Multi-wavelength Study of HESS J0632+057: New Insights into Pulsar-Disk Interaction
Multi-wavelength Study of HESS J0632+057: New Insights into Pulsar-Disk Interaction Open
We present an analysis of new multi-wavelength observations of the TeV gamma-ray binary HESS J0632+057, conducted using SALT, Swift, NuSTAR, and VERITAS in 2023--2024. By combining these new data with archival observations, we confirm prev…
View article: Genetic Diversity and Phylogenetic Analysis Among Multidrug-Resistant Pseudomonas spp. Isolated from Solid Waste Dump Sites and Dairy Farms
Genetic Diversity and Phylogenetic Analysis Among Multidrug-Resistant Pseudomonas spp. Isolated from Solid Waste Dump Sites and Dairy Farms Open
The excessive use of antimicrobials drives the emergence of multidrug resistance (MDR) in bacterial strains, which harbor resistance genes to survive under diverse drug pressures. Such resistance can result in life-threatening infections. …
View article: Supermassive Black Holes and Their Surroundings: MeV Signatures
Supermassive Black Holes and Their Surroundings: MeV Signatures Open
View article: Multiwavelength Observation of a Candidate Pulsar Halo LHAASO J0621+3755 and the First X-Ray Detection of PSR J0622+3749
Multiwavelength Observation of a Candidate Pulsar Halo LHAASO J0621+3755 and the First X-Ray Detection of PSR J0622+3749 Open
Pulsar halos are regions around middle-aged pulsars extending out to tens of parsecs. The large extent of the halos and well-defined central cosmic-ray accelerators make this new class of Galactic sources an ideal laboratory for studying c…
View article: Constraints on the X-Ray and Very-high-energy Gamma-Ray Flux from Supernova Remnant W44
Constraints on the X-Ray and Very-high-energy Gamma-Ray Flux from Supernova Remnant W44 Open
Observations of GeV gamma-ray emission from the well-studied mixed-morphology supernova remnant (SNR) W44 by Fermi-Large Area Telescope and AGILE imply that it is a site of significant cosmic-ray acceleration. The spectral energy distribut…
View article: Constraints on the X-ray and Very High Energy $γ$-ray Flux from Supernova Remnant W44
Constraints on the X-ray and Very High Energy $γ$-ray Flux from Supernova Remnant W44 Open
Observations of GeV gamma-ray emission from the well-studied mixed-morphology supernova remnant (SNR) W44 by Fermi-LAT and AGILE imply that it is a site of significant cosmic ray acceleration. The spectral energy distribution (SED) derived…
View article: An In-depth Study of Gamma Rays from the Starburst Galaxy M82 with VERITAS
An In-depth Study of Gamma Rays from the Starburst Galaxy M82 with VERITAS Open
Assuming Galactic cosmic rays originate in supernovae and the winds of massive stars, starburst galaxies should produce very-high-energy (VHE; E > 100 GeV) gamma-ray emission via the interaction of their copious quantities of cosmic rays w…
View article: VERITAS and multiwavelength observations of the Blazar B3 2247+381 in response to an IceCube neutrino alert
VERITAS and multiwavelength observations of the Blazar B3 2247+381 in response to an IceCube neutrino alert Open
While the sources of the diffuse astrophysical neutrino flux detected by the IceCube Neutrino Observatory are still largely unknown, one of the promising methods used towards understanding this is investigating the potential temporal and s…
View article: Spectrum and Location of Ongoing Extreme Particle Acceleration in Cassiopeia A
Spectrum and Location of Ongoing Extreme Particle Acceleration in Cassiopeia A Open
Young supernova remnants (SNRs) are believed to be the origin of energetic cosmic rays (CRs) below the “knee” of their spectrum at ∼3 PeV (10 15 eV). Nevertheless, the precise location, duration, and operation of CR acceleration in young S…
View article: An In-depth Study of Gamma Rays from the Starburst Galaxy M82 with VERITAS
An In-depth Study of Gamma Rays from the Starburst Galaxy M82 with VERITAS Open
Assuming Galactic cosmic rays originate in supernovae and the winds of massive stars, starburst galaxies should produce very-high-energy (VHE; E > 100 GeV) gamma-ray emission via the interaction of their copious quantities of cosmic rays w…
View article: First Operation of a Liquid Argon Time Projection Chamber (LArTPC) in the Stratosphere as an Engineering Gamma-Ray and AntiMatter Survey (GRAMS) Balloon Flight (eGRAMS)
First Operation of a Liquid Argon Time Projection Chamber (LArTPC) in the Stratosphere as an Engineering Gamma-Ray and AntiMatter Survey (GRAMS) Balloon Flight (eGRAMS) Open
Gamma-Ray and AntiMatter Survey (GRAMS) is a next-generation balloon/satellite experiment utilizing a Liquid Argon Time Projection Chamber (LArTPC), to simultaneously target astrophysical observations of cosmic MeV gamma rays and conduct a…
View article: Spectrum and location of ongoing extreme particle acceleration in Cassiopeia A
Spectrum and location of ongoing extreme particle acceleration in Cassiopeia A Open
Young supernova remnants (SNRs) are believed to be the origin of energetic cosmic rays (CRs) below the "knee" of their spectrum at $\sim3$ petaelectronvolt (PeV, $10^{15}$ eV). Nevertheless, the precise location, duration, and operation of…
View article: Multiwavelength Investigation of γ-Ray Source MGRO J1908+06 Emission Using Fermi-LAT, VERITAS and HAWC
Multiwavelength Investigation of γ-Ray Source MGRO J1908+06 Emission Using Fermi-LAT, VERITAS and HAWC Open
This paper investigates the origin of the γ -ray emission from MGRO J1908+06 in the GeV–TeV energy band. By analyzing the data collected by the Fermi Large Area Telescope, the Very Energetic Radiation Imaging Telescope Array System, and Hi…
View article: A Multiwavelength Study to Decipher the 2017 Flare of the Blazar OJ 287
A Multiwavelength Study to Decipher the 2017 Flare of the Blazar OJ 287 Open
In 2017 February, the blazar OJ 287 underwent a period of intense multiwavelength activity. It reached a new historic peak in the soft X-ray (0.3–10 keV) band, as measured by the Swift X-ray Telescope. This event coincides with a very-high…
View article: The Very Energetic Radiation Imaging Telescope Array System (VERITAS)
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) Open
View article: A Multiwavelength Study to Decipher the 2017 Flare of the Blazar OJ 287
A Multiwavelength Study to Decipher the 2017 Flare of the Blazar OJ 287 Open
In 2017 February, the blazar OJ 287 underwent a period of intense multiwavelength activity. It reached a new historic peak in the soft X-ray (0.3–10 keV) band, as measured by the Swift X-ray Telescope. This event coincides with a very-high…
View article: A Multiwavelength Investigation of PSR J2229+6114 and its Pulsar Wind Nebula in the Radio, X-Ray, and Gamma-Ray Bands
A Multiwavelength Investigation of PSR J2229+6114 and its Pulsar Wind Nebula in the Radio, X-Ray, and Gamma-Ray Bands Open
G106.3+2.7, commonly considered to be a composite supernova remnant (SNR), is characterized by a boomerang-shaped pulsar wind nebula (PWN) and two distinct (“head” and “tail”) regions in the radio band. A discovery of very-high-energy gamm…
View article: A Multiwavelength Investigation of PSR J2229+6114 and its Pulsar Wind Nebula in the Radio, X-Ray, and Gamma-Ray Bands
A Multiwavelength Investigation of PSR J2229+6114 and its Pulsar Wind Nebula in the Radio, X-Ray, and Gamma-Ray Bands Open
G106.3+2.7, commonly considered to be a composite supernova remnant (SNR), is characterized by a boomerang-shaped pulsar wind nebula (PWN) and two distinct (“head” and “tail”) regions in the radio band. A discovery of very-high-energy gamm…
View article: Pathways to Discovery in Astronomy and Astrophysics for the 2020s
Pathways to Discovery in Astronomy and Astrophysics for the 2020s Open
We live in an extraordinary period of discovery in astronomy and astrophysics. Six Nobel Prizes have been awarded over the past decade alone for discoveries based on astronomical data (dark energy, gravitational waves, neutrino oscillation…
View article: Multiwavelength Observations of the Blazar PKS 0735+178 in Spatial and Temporal Coincidence with an Astrophysical Neutrino Candidate IceCube-211208A
Multiwavelength Observations of the Blazar PKS 0735+178 in Spatial and Temporal Coincidence with an Astrophysical Neutrino Candidate IceCube-211208A Open
We report on multiwavelength target-of-opportunity observations of the blazar PKS 0735+178, located 2.°2 away from the best-fit position of the IceCube neutrino event IceCube-211208A detected on 2021 December 8. The source was in a high-fl…
View article: Hard X-Ray Observation and Multiwavelength Study of the PeVatron Candidate Pulsar Wind Nebula “Dragonfly”
Hard X-Ray Observation and Multiwavelength Study of the PeVatron Candidate Pulsar Wind Nebula “Dragonfly” Open
We studied the PeVatron nature of the pulsar wind nebula (PWN) G75.2+0.1 (“Dragonfly”) as part of our NuSTAR observational campaign of energetic PWNe. The Dragonfly is spatially coincident with LHAASO J2018+3651, whose maximum photon energ…
View article: MeV gamma-ray all-sky simulation
MeV gamma-ray all-sky simulation Open
The MeV gamma-ray domain is the only unexplored window among recent multiwavelength observations in astrophysics, often referred to as the "MeV gap". To bridge this gap, there are several ongoing and planned projects of MeV gamma-ray teles…
View article: Comparative study of CTAO Medium-size telescopes array layouts performances in gamma-ray burst observations
Comparative study of CTAO Medium-size telescopes array layouts performances in gamma-ray burst observations Open
The Cherenkov Telescope Array Observatory (CTAO), thanks to its unprecedented sensitivity in the very high-energy gamma-ray band for transient phenomena and short-timescale variability, will significantly improve the temporal and spectral …
View article: A VERITAS/Breakthrough Listen Search for Optical Technosignatures
A VERITAS/Breakthrough Listen Search for Optical Technosignatures Open
The Breakthrough Listen Initiative is conducting a program using multiple telescopes around the world to search for “technosignatures”: artificial transmitters of extraterrestrial origin from beyond our solar system. The Very Energetic Rad…
View article: Exploring the Potential of the Pulsed Laser onboard the CALIPSO Satellite to Improve Calibration with VERITAS
Exploring the Potential of the Pulsed Laser onboard the CALIPSO Satellite to Improve Calibration with VERITAS Open
Imaging Atmospheric Cherenkov Telescopes (IACTs) are used to detect bright\nnanosecond-duration flashes of optical light originating from interactions of\ncosmic/gamma-rays in the atmosphere. A natural calibration source with similar\nchar…
View article: A VERITAS/Breakthrough Listen Search for Optical Technosignatures
A VERITAS/Breakthrough Listen Search for Optical Technosignatures Open
The Breakthrough Listen Initiative is conducting a program using multiple telescopes around the world to search for "technosignatures": artificial transmitters of extraterrestrial origin from beyond our solar system. The VERITAS Collaborat…
View article: Hard X-ray observation and multiwavelength study of the PeVatron candidate pulsar wind nebula "Dragonfly"
Hard X-ray observation and multiwavelength study of the PeVatron candidate pulsar wind nebula "Dragonfly" Open
We studied the PeVatron nature of the pulsar wind nebula G75.2+0.1 ("Dragonfly") as part of our NuSTAR observational campaign of energetic PWNe. The Dragonfly is spatially coincident with LHAASO J2018+3651 whose maximum photon energy is 0.…
View article: VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations
VERITAS Discovery of Very High Energy Gamma-Ray Emission from S3 1227+25 and Multiwavelength Observations Open
We report the detection of very high energy gamma-ray emission from the blazar S3 1227+25 (VER J1230+253) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations of the source were triggered by the …