Results 91 to 100 of about 6,020,151 (174)

Gamma-Ray Bursts Observed by the Transiting Exoplanet Survey Satellite: Prompt Optical Counterparts and Afterglows of Swift-XRT-localized Gamma-Ray Bursts

The Astrophysical Journal
Very few detections have been made of optical flashes contemporaneous with prompt high-energy emission from a gamma-ray burst (GRB). In this work, we present and analyze light curves of GRB-associated optical flashes and afterglows from the Transiting ...
Rahul Jayaraman, Michael Fausnaugh, George R. Ricker, Roland Vanderspek, Geoffrey Mo   +4 more
doaj   +1 more source

Chandra X-Ray Observatory Observations of 13 Fermi LAT Sources

The Astrophysical Journal
In the latest data release from the Fermi Gamma-ray Space Telescope (the 4th Fermi LAT 14 yr Catalog, or 4FGL), more than 50% of the Galactic sources are yet to be identified.
Blagoy Rangelov, Hui Yang, Brice Williams, Oleg Kargaltsev, Jeremy Hare, Kean Martinic   +5 more
doaj   +1 more source

PKS 2254+074: A Blazar in Likely Association with the Neutrino Event IceCube-190619A

The Astrophysical Journal Letters
We report our study of the field of the ≃0.2 PeV neutrino event IC-190619A. This neutrino belongs to Gold events, which more likely have an astrophysical origin.
Shunhao Ji, Zhongxiang Wang
doaj   +1 more source

Fermi Unassociated Sources in the MeerKAT Absorption Line Survey

The Astrophysical Journal
Over 2000 γ -ray sources identified by the Large Area Telescope on NASA's Fermi Gamma-ray Space Telescope are considered unassociated, meaning that they have no known counterparts in any other frequency regime.
Morgan Himes, Preshanth Jagannathan, Dale A. Frail, Frank Schinzel, Neeraj Gupta, S. A. Balashev, F. Combes, P. P. Deka, H.-R. Klöckner, E. Momjian, J. D. Wagenveld   +10 more
doaj   +1 more source

Sixteen Years of Gamma-Ray Discoveries and AGN Observations with Fermi-LAT

Particles
In June 2024, the Fermi Gamma-Ray Space Telescope (FGST) celebrated its 16th year of operations. The Fermi Large Area Telescope (Fermi-LAT) is the main instrument onboard the FGST satellite and is designed to be sensitive to γ-rays in the energy range ...
Fausto Casaburo, Stefano Ciprini, Dario Gasparrini, Federica Giacchino   +3 more
doaj   +1 more source

Neutron star mass estimates from gamma-ray eclipses in spider millisecond pulsar binaries. [PDF]

Nat Astron, 2023
Clark CJ, Kerr M, Barr ED, Bhattacharyya B, Breton RP, Bruel P, Camilo F, Chen W, Cognard I, Cromartie HT, Deneva J, Dhillon VS, Guillemot L, Kennedy MR, Kramer M, Lyne AG, Sánchez DM, Nieder L, Phillips C, Ransom SM, Ray PS, Roberts MSE, Roy J, Smith DA, Spiewak R, Stappers BW, Tabassum S, Theureau G, Voisin G.   +28 more
europepmc   +1 more source

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source

Discerning Misclassified Flat-spectrum Radio Quasars from Low-frequency-peaked BL Lacertae Objects

The Astrophysical Journal Supplement Series
A sample of 312 low-frequency-peaked BL Lacertae objects (LBLs) and 694 flat-spectrum radio quasars (FSRQs) with the parameters of both redshift and gamma-ray photon spectral index (Γ _γ ) is compiled from the Fourth Catalog of Active Galactic Nuclei ...
S. Liang, W. G. Yang, Y. G. Zheng, S. J. Kang   +3 more
doaj   +1 more source

Very High Energy Gamma-Rays from Binary Systems [PDF]

, 2010
This thesis presents a study of the very high energy (VHE) gamma-ray emission from X-ray binary systems using the H.E.S.S. imaging atmospheric Cherenkov array.
DICKINSON, HUGH,JOHN, Dickinson, Hugh John   +1 more
core  

Time-averaging Polarimetric and Spectral Properties of Gamma-Ray Bursts

The Astrophysical Journal Supplement Series
The composition and radiation mechanism of gamma-ray bursts (GRBs) within jets continue to be hotly debated. Investigating the joint polarimetric and spectral properties is crucial for understanding the composition and radiation mechanism of GRBs ...
Liang Li, Soroush Shakeri
doaj   +1 more source