Results 11 to 20 of about 70,039 (295)

Monitoring the Low-Energy Gamma-Ray Sky Using Earth Occultation with GLAST GBM [PDF]

, 2007
Long term all-sky monitoring of the 20 keV – 2 MeV gamma-ray sky using the Earth occultation technique was demonstrated by the BATSE instrument on the Compton Gamma Ray Observatory.
Case, G. L., Cherry, M. L., Kippen, R. M., Ling, J. C., Radocinski, R. G., Wheaton, W. A., Wilson-Hodge, C. A.   +6 more
core   +1 more source

Variable optical/infrared counterpart to the transient gamma-ray source J0109+6134 [PDF]

Astronomy & Astrophysics, 2014
Context. We investigate the optical/infrared counterpart to the flaring gamma-ray source J0109+6134, which is believed to be a blazar seen through the Galactic plane.Aims. The original aim of this work was to confirm the previously proposed optical counterpart by means of studying its temporal behaviour.
E. Fernández-Valenzuela, J. Martí, P. L. Luque-Escamilla, A. J. Muñoz-Arjonilla, J. M. Paredes   +4 more
openaire   +1 more source

The HAWC Gamma-Ray Observatory: Sensitivity to Steady and Transient Sources of Gamma Rays

, 2013
The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is designed to record air showers produced by cosmic rays and gamma rays between 100 GeV and 100 TeV. Because of its large field of view and high livetime, HAWC is well-suited to measure gamma rays from extended sources, diffuse emission, and transient sources.
Collaboration, HAWC, Abeysekara, AU, Alfaro, R, Alvarez, C, Álvarez, JD, Arceo, R, Arteaga-Velázquez, JC, Solares, HA Ayala, Barber, AS, Baughman, BM, Bautista-Elivar, N, Belmont, E, BenZvi, SY, Berley, D, Rosales, M Bonilla, Braun, J, Caballero-Lopez, RA, Caballero-Mora, KS, Carramiñana, A, Castillo, M, Cotti, U, Cotzomi, J, Fuente, E de la, León, C De, DeYoung, T, Hernandez, R Diaz, Díaz-Vélez, JC, Dingus, BL, DuVernois, MA, Ellsworth, RW, Fernandez, A, Fiorino, DW, Fraija, N, Galindo, A, Garfias, F, González, LX, González, MM, Goodman, JA, Grabski, V, Gussert, M, Hampel-Arias, Z, Hui, CM, Hüntemeyer, P, Imran, A, Iriarte, A, Karn, P, Kieda, D, Kunde, GJ, Lara, A, Lauer, RJ, Lee, WH, Lennarz, D, Vargas, H León, Linares, EC, Linnemann, JT, Longo, M, Luna-GarcIa, R, Marinelli, A, Martinez, H, Martinez, O, Martínez-Castro, J, Matthews, JAJ, Miranda-Romagnoli, P, Moreno, E, Mostafá, M, Nava, J, Nellen, L, Newbold, M, Noriega-Papaqui, R, Oceguera-Becerra, T, Patricelli, B, Pelayo, R, Pérez-Pérez, EG, Pretz, J, Rivière, C, Rosa-González, D, Salazar, H, Salesa, F, Sanchez, FE, Sandoval, A, Santos, E, Schneider, M, Silich, S, Sinnis, G, Smith, AJ, Sparks, K, Springer, RW, Taboada, I, Toale, PA, Tollefson, K, Torres, I, Ukwatta, TN, Villaseñor, L, Weisgarber, T, Westerhoff, S, Wisher, IG, Wood, J, Yodh, GB, Younk, PW, Zaborov, D   +99 more
openaire   +4 more sources

The Fermi Gamma-ray Burst Monitor: Results from the first two years [PDF]

, 2011
In the first two years since the launch of the Fermi Observatory, the Gamma-ray Burst Monitor (GBM) has detected over 500 Gamma-Ray Bursts (GRBs), of which 18 were confidently detected by the Large Area Telescope (LAT) above 100 MeV.
BISSALDI E., on behalf of the Fermi GBM Collaboration   +1 more
core   +2 more sources

Precise source location of the anomalous 1979 March 5 gamma-ray transient [PDF]

The Astrophysical Journal, 1982
Refinements in the source direction analysis of the observations of the unusual gamma ray transient are presented. The final results from the interplanetary gamma ray burst network produce a 0.1 arc sq. min. error box. It is nested inside the initially determined 2 arc sq min. source region. This smaller source location is within both the optical and X-
T. L. Cline, U. D. Desai, B. J. Teegarden, W. D. Evans, R. W. Klebesadel, J. G. Laros, C. Barat, K. Hurley, M. Niel, M. C. Weisskopf   +9 more
openaire   +1 more source

Variable gamma-ray emission from the Be/X-ray transient A0535+26? [PDF]

, 2001
We present a study of the unidentified gamma-ray source 3EG J0542+2610. This source is spatially superposed to the supernova remnant G180.0-1.7, but its time variability makes unlikely a physical link.
Bernado, M. M. Kaufman, Combi, Jorge A., Romero, Gustavo E., Torres, Diego F.   +3 more
core   +2 more sources

Discovery of a transient MeV range gamma-ray source

The Astrophysical Journal, 1995
The University of California, San Diego (UCSD)/MIT hard X-ray and gamma-ray instrument on the HEAO 1 surveyed the region near the Galactic center 3 times during its lifetime in 1977-1979. During the 1977 September-October scan, a gamma-ray source was detected south of the Galactic center. The source was below the threshold sensitivity in the spring and
M. S. Briggs, D. E. Gruber, J. L. Matteson, L. E. Peterson   +3 more
openaire   +1 more source

Dedicated polarimeter design for hard x-ray and soft gamma-ray astronomy [PDF]

, 2004
We have developed a modular design for a hard X-ray and soft gamma-ray polrimeter that we call GRAPE (Gamma RAy Polarimeter Experiment). Optimized for the energy range of 50-300 keV, the GRAPE design is a Compton polarimeter based on the use of an array ...
Ledoux, J, Macri, John R, McConnell, Mark L, Ryan, James M.   +3 more
core   +2 more sources

GeV Gamma-Ray Sources [PDF]

, 2000
We report on the preliminary extension of our work on cataloging the GeV sky to approximately 7 years of CGRO/EGRET observations with special emphasis on a search for transient sources. The search method and significance levels are presented. Our initial
Lamb, R. C., Macomb, D. J.
core   +1 more source

First Results from Fermi GBM Earth Occultation Monitoring: Observations of Soft Gamma-Ray Sources Above 100 keV [PDF]

, 2010
The NaI and BGO detectors on the Gamma-ray Burst Monitor (GBM) on Fermi are now being used for long-term monitoring of the hard X-ray/low energy gamma-ray sky.
A. Camero-Arranz, A. von Kienlin, Atwood, Bouchet, C. A. Meegan, C. A. Wilson-Hodge, Caballero-García, Cadolle Bel, Case, Case, Case, Connaughton, Cowley, E. Beklen, Fishman, G. L. Case, Gehrels, Harmon, Harmon, Homan, Hoover, J. C. Rodi, J. Greiner, Jourdain, Levine, Ling, Ling, Ling, M. H. Finger, M. L. Cherry, M. S. Briggs, Markwardt, Markwardt, Matsuoka, McClintock, McConnell, Meegan, Miller, Much, Muñoz-Darias, Muñoz-Darias, Negoro, Negoro, P. Jenke, P. N. Bhat, Paczynski, Palmer, Petry, R. M. Kippen, R. Preece, Rothschild, Shaposhnikov, Smith, Steinle, Tueller, US Committee on Extension to the Standard Atmosphere., V. Chaplin, V. Connaughton, W. S. Paciesas, Wilson-Hodge, Wilson-Hodge, Wilson-Hodge, Wilson-Hodge, Yamaoka, Zdziarski   +64 more
core   +3 more sources