Results 21 to 30 of about 70,039 (295)

Hybrid Emission Modeling of GRB 221009A: Shedding Light on TeV Emission Origins in Long GRBs

The Astrophysical Journal, 2023
Observations of long-duration gamma-ray bursts (GRBs) with TeV emission during their afterglow have been on the rise. Recently, GRB 221009A, the most energetic GRB ever observed, was detected by the Large High Altitude Air Shower Observatory experiment ...
Hebzibha Isravel, Damien Bégué, Asaf Pe’er   +2 more
doaj   +1 more source

The detector response matrices of the burst and transient source experiment (BATSE) on the Compton Gamma Ray Observatory [PDF]

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1995
Abstract The detector response matrices for the Burst And Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory (CGRO) are described, including their creation and operation in data analysis. These response matrices are a detailed abstract representation of the gamma-ray detectors' operating characteristics that are needed for
Geoffrey N. Pendleton, William S. Paciesas, Robert S. Mallozzi, Tom M. Koshut, Gerald J. Fishman, Charles A. Meegan, Robert B. Wilson, John M. Horack, John Patrick Lestrade   +8 more
openaire   +2 more sources

A mass model for estimating the gamma ray background of the Burst and Transient Source Experiment [PDF]

Astronomy & Astrophysics, 2003
Orbiting x-ray and gamma ray instruments are subject to large background count rates due to local particle fluxes in the space environment. The ability of an instrument to make calibrated measurements of the flux from a source of interest is highly dependent on accurately determining the background level.
S. E. Shaw, M. J. Westmore, A. J. Bird, A. J. Dean, C. Ferguson, R. Gurriaran, J. J. Lockley, D. R. Willis   +7 more
openaire   +2 more sources

Ultrahigh-Energy Photons as a Probe of Nearby Transient Ultrahigh-Energy Cosmic-Ray Sources and Possible Lorentz-Invariance Violation

, 2009
Detecting neutrinos and photons is crucial to identifying the sources of ultrahigh-energy cosmic rays (UHECRs), especially for transient sources. We focus on ultrahigh-energy gamma-ray emission from transient sources such as gamma-ray bursts, since >EeV ...
J. Rachen, Kohta Murase, R. J. Protheroe   +2 more
core   +1 more source

X-ray outbursts of AXPs and SGRs [PDF]

, 2010
We show that the X‐ray enhancement light curves of transient AXP∕SGRs can be reproduced by the active fallback disk model. We solve the diffusion equation for the relaxation of a disk that has been pushed back by a soft gamma‐ray burst.
Caliskan, Sirin, Ertan, Unal, Ertan, Ünal, Çalışkan, Şirin   +3 more
core   +1 more source

The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision

The Astrophysical Journal
We present the early radio detection and multiwavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift z = 0.257. The Australia Telescope Compact Array automatically triggered a 9 hr observation of GRB 231117A at 5.5 and 9 GHz following
G. E. Anderson, G. P. Lamb, B. P. Gompertz, L. Rhodes, A. Martin-Carrillo, A. J. van der Horst, A. Rowlinson, M. E. Bell, T.-W. Chen, H. M. Fausey, M. Ferro, P. J. Hancock, S. R. Oates, S. Schulze, R. L. C. Starling, S. Yang, K. Ackley, J. P. Anderson, A. Andersson, J. F. Agüí Fernández, R. Brivio, E. Burns, K. C. Chambers, T. de Boer, V. D’Elia, M. De Pasquale, A. de Ugarte Postigo, Dimple, R. Fender, M. D. Fulton, H. Gao, J. H. Gillanders, D. A. Green, M. Gromadzki, A. Gulati, D. H. Hartmann, M. E. Huber, N. J. Klingler, N. P. M. Kuin, J. K. Leung, A. J. Levan, C.-C. Lin, E. Magnier, D. B. Malesani, P. Minguez, K. P. Mooley, T. Mukherjee, M. Nicholl, P. T. O’Brien, G. Pugliese, A. Rossi, S. D. Ryder, B. Sbarufatti, B. Schneider, F. Schüssler, S. J. Smartt, K. W. Smith, S. Srivastav, D. Steeghs, N. R. Tanvir, C. C. Thoene, S. D. Vergani, R. J. Wainscoat, Z.-N. Wang, R. A. M. J. Wijers, D. Williams-Baldwin, I. Worssam, T. Zafar   +67 more
doaj   +1 more source

The MEGA Advanced Compton Telescope Project [PDF]

, 2001
The goal of the Medium Energy Gamma-ray Astronomy (MEGA) telescope is to improve sensitivity at medium gamma-ray energies (0.4-50 MeV) by at least an order of magnitude over that of COMPTEL. This will be achieved with a new compact design that allows for
A Zoglauer, Aprile, Boggs, F Schopper, G Kanbach, P.F Bloser, R Andritschke, Schopper, V Schönfelder, Wilderman   +9 more
core   +2 more sources

EDNRB‐dependent endothelin signaling reduces proliferation and promotes proneural‐to‐mesenchymal transition in gliomas

Molecular Oncology, EarlyView.
Glioma cells mainly express the endothelin receptor EDNRB, while EDNRA is restricted to a perivascular tumor subpopulation. Endothelin signaling reduces glioma cell proliferation while promoting migration and a proneural‐to‐mesenchymal transition associated with poor prognosis. This pathway activates Ca2+, K+, ERK, and STAT3 signalings and is regulated
Donovan Pineau, Leonor Garcia, Hugo Arnold, Antonija Hanžek, Maialen Arrieta, Laurent R Gauthier, Christine Granotier‐Beckers, François D Boussin, Amaury Herbet, Marie Hautière, Valentin Asei‐Ceschino, Clémentin Jacques, Laura Brard, Thomas Harnois, Valérie Coronas, Bruno Constantin, Aurélien Chatelier, Jean Chemin, Serge Urbach, Martial Seveno, Szimonetta Hideg, Chantal Ripoll, Kasandra Aguilar‐Cázarez, Min Zheng, Guo‐Hao Huang, Sheng‐Qing Lv, Lei Zhang, Philippe Rondard, Laurent Prezeau, Jean‐Philippe Pin, Hugues Duffau, Luc Bauchet, Valérie Rigau, Franck Denat, Charles Truillet, Didier Boquet, Jean‐Philippe Hugnot   +36 more
wiley   +1 more source

The Case of the Missing Very High-energy Gamma-Ray Bursts: A Retrospective Study of Swift Gamma-Ray Bursts with Imaging Atmospheric Cherenkov Telescopes

The Astrophysical Journal
Gamma-ray bursts (GRBs) are particle acceleration sites that can emit photons in the very high-energy (VHE) domain through nonthermal processes. From 2004 until 2018, the current generation of Imaging Atmospheric Cherenkov Telescopes (IACTs) did not ...
H. Ashkar, A. Sangaré, S. Fegan, J. Damascene Mbarubucyeye, E. Ruiz-Velasco, S. J. Zhu   +5 more
doaj   +1 more source

A Search for Hard X-Ray Emission from Globular Clusters - Constraints from BATSE [PDF]

, 1996
We have monitored a sample of 27 nearby globular clusters in the hard X-ray band (20-120 keV) for approximately 1400 days using the BATSE instrument on board the Compton Gamma-Ray Observatory.
Ford, E., Harmon, B. A., Kaaret, P., Tavani, M., Zhang, S. N.   +4 more
core   +2 more sources