Refine
Has Fulltext
- no (71)
Year of publication
Document Type
- Article (71)
Language
- English (71)
Is part of the Bibliography
- yes (71)
Keywords
- gamma rays: galaxies (20)
- gamma rays: general (16)
- BL Lacertae objects: general (12)
- galaxies: active (11)
- acceleration of particles (8)
- astroparticle physics (7)
- radiation mechanisms: non-thermal (7)
- binaries: general (6)
- ISM: supernova remnants (3)
- X-rays: binaries (3)
- cosmic rays (3)
- galaxies: jets (3)
- galaxies: nuclei (3)
- gamma rays: stars (3)
- gamma-rays: general (3)
- magnetic fields (3)
- BL Lacertae objects: individual (B2 1215+30, VER J1217+301) (2)
- BL Lacertae objects: individual: Mrk 421 (2)
- BL Lacertae objects: individual: Mrk 501 (2)
- Galaxy: center (2)
- diffuse radiation (2)
- gamma-ray burst: general (2)
- methods: data analysis (2)
- pulsars: general (2)
- relativistic processes (2)
- AGN (1)
- Active galactic nuclei (1)
- BL Lacertae objects: individual (1ES 0229+200, VER J0232+202) (1)
- BL Lacertae objects: individual (1ES 0414+009, ERJ0416+011) (1)
- BL Lacertae objects: individual (1ES 1959+650) (1)
- BL Lacertae objects: individual (1ES 1959+650=VER J1959+651) (1)
- BL Lacertae objects: individual (1ES1218+30.4) (1)
- BL Lacertae objects: individual (BL Lacertae = VER J2202+422) (1)
- BL Lacertae objects: individual (Mrk 501) (1)
- BL Lacertae objects: individual (PKS 1424+240)-cosmic background radiation (1)
- BL Lacertae objects: individual (RBS 0413-VER J0319+187) (1)
- BL Lacertae objects: individual (RX J0648.7+1516, 1FGL J0648.8+1516, VER J0648+152) (1)
- BL Lacertae objects: individual (TXS 0506+056, VER J0509+057) (1)
- BL Lacertae objects: individual (VER J0521+211) (1)
- BL Lacertae objects: individual: 1ES 2344+514=VERJ2347+517 (1)
- BL Lacertae objects: individual: Markarian 501 (1)
- BL Lacertae objects: individual: Mrk501 (1)
- Childhood traits and disorders (1)
- Consortium (1)
- Cosmology (1)
- Diffuse radiation (1)
- Extragalactic astronomy (1)
- Genetics (1)
- IACT (1)
- ISM: individual objects (Crab Nebula) (1)
- ISM: individual objects (G120.1+01.4, Tycho=VER J0025+641) (1)
- Instrumentation (1)
- Longitudinal (1)
- Markarian 421 (1)
- Moonlight (1)
- Observing methods (1)
- TeV gamma rays (1)
- VERITAS (1)
- X-rays: galaxies (1)
- X-rays: individual (Cygnus X-3) (1)
- X-rays: individual (RX J0007.0+7303) (1)
- accretion, accretion disks (1)
- astrobiology (1)
- binaries: close (1)
- black hole physics (1)
- cosmic background radiation (1)
- dark matter (1)
- data behind figure (1)
- extraterrestrial intelligence (1)
- galaxies: Seyfert (1)
- galaxies: active-galaxies: individual: PMN J0948+0022 (1)
- galaxies: clusters: general (1)
- galaxies: clusters: individual (Coma (ACO 1656)) (1)
- galaxies: individual (BL Lacertae, VER J2202+422) (1)
- galaxies: individual (M 87) (1)
- galaxies: individual (M 87, VER J1230+123) (1)
- galaxies: individual (Markarian 501) (1)
- galaxies: individual (RGB J2243+203) (1)
- galaxies: individual: 1ES 1741+196=VER J1744+195 (1)
- gamma rays : stars (1)
- gamma rays: galaxies: clusters (1)
- gamma rays: general(HESS J0632+057, VER J0633+057) (1)
- gamma-ray burst: individual (GRB 130427A) (1)
- gamma-ray burst: individual (GRB 150323A) (1)
- gamma-ray burst: individual (MGRO J1908+06, VER J1907+062) (1)
- gamma-rays: galaxies (1)
- gamma-rays: stars (1)
- material (1)
- methods: observational (1)
- neutrinos (1)
- novae, cataclysmic variables (1)
- pulsars : individual (PSR J2021+3651) (1)
- pulsars: individual (PSR J0007+7303) (1)
- pulsars: individual (PSR J0633+1746, Geminga) (1)
- pulsars: individual (PSR J1023+0038) (1)
- pulsars: individual (PSR J1907+0602) (1)
- pulsars: individual (PSR J2032+4127) (1)
- pulsars: individual: B0531+21 (1)
- quasars: general (1)
- rays: stars (1)
- stars: individual ( KIC 8462852) (1)
- stars: individual (1A 0535+262) (1)
- stars: individual (LS I+61 degrees 303, VER J0240+612) (1)
- supernovae : individual (CTB 87) (1)
- supernovae: individual (G0.9+0.1) (1)
- supernovae: individual (G119.5+10.2) (1)
- techniques: photometric (1)
- white dwarfs (1)
Institute
On 2015 March 23, the Very Energetic Radiation Imaging Telescope Array System (VERITAS) responded to a Swift-Burst Alert Telescope (BAT) detection of a gamma-ray burst, with observations beginning 270 s after the onset of BAT emission, and only 135 s after the main BAT emission peak. No statistically significant signal is detected above 140 GeV. The VERITAS upper limit on the fluence in a 40-minute integration corresponds to about 1% of the prompt fluence. Our limit is particularly significant because the very-high-energy (VHE) observation started only similar to 2 minutes after the prompt emission peaked, and Fermi-Large Area Telescope observations of numerous other bursts have revealed that the high-energy emission is typically delayed relative to the prompt radiation and lasts significantly longer. Also, the proximity of GRB 150323A (z = 0.593) limits the attenuation by the extragalactic background light to similar to 50% at 100-200 GeV. We conclude that GRB 150323A had an intrinsically very weak high-energy afterglow, or that the GeV spectrum had a turnover below similar to 100 GeV. If the GRB exploded into the stellar wind of a massive progenitor, the VHE non-detection constrains the wind density parameter to be A greater than or similar to 3 x 10(11) g . cm(-1), consistent with a standard Wolf-Rayet progenitor. Alternatively, the VHE emission from the blast wave would be weak in a very tenuous medium such as the interstellar medium, which therefore cannot be ruled out as the environment of GRB 150323A.