34 research outputs found
Six Years of Bursts with the SPI-ACS
No full textThe anticoincidence system of the INTEGRAL spectrometer has been an essential component of the
interplanetary network since launch. It has observed about 600 events which have been confirmed as
either soft gamma repeaters or cosmic gamma ray bursts by other instruments in the IPN. It has also
observed over 130 events which are unconfirmed, but which are almost certainly weak bursts below the
thresholds of the other IPN experiments. We review the highlights of these observations, which include
gamma-ray bursts, soft gamma repeaters, and one or two extragalactic giant magnetar flares
GLAST burst monitor instrument simulation and modeling
No full textThe GLAST Burst Monitor (GBM) will enhance LAT observations of GRBs by extending the spectral coverage from the LAT threshold down to ∼8keV, and will provide a trigger for re-orienting the spacecraft to observe delayed emission from selected bursts outside the LAT field of view. GBM consists of twelve NaI scintillation detectors operating in the 8 keV to 1 MeV energy range and two BGO scintillation detectors operating in the 150 keV to 30 MeV energy range. Detector resolution, effective area, and angular response have been determined by calibrations. Analyses indicate that the on-board burst threshold will be ∼0.7photonscm-2s-1 and the on-board burst localization accuracy will typically be better than 8°. © 2008 American Institute of Physics
On-Orbit Performance of the Fermi Gamma-Ray Burst Monitor
No full textThe Fermi Gamma Ray Burst Monitor (GBM) enhances the science return from the Fermi mission by providing observations of GRBs in the energy range 8 keV to 40 MeV, thereby extending GRB spectra three decades below the Large Area Telescope (LAT) threshold of ~20 MeV. GBM employs twelve sodium iodide scintillation detectors and two bismuth germinate scintillation detectors to observe the full unocculted sky. The flight software localizes GRBs and can generate a request to autonomously repoint the spacecraft to place a burst within the LAT field of view. GBM has a trigger threshold of 0.74 photons-cm-2-s-1 and triggers on ~260 bursts per year, as well as a variety of other gamma-ray transients
On-orbit performance of the Fermi gamma-ray burst monitor
No full textThe Fermi Gamma Ray Burst Monitor (GBM) enhances the science return from the Fermi mission by roviding observations of GRBs in the energy range 8 keV to 40 MeV, thereby extending GRB spectra three decades elow the Large Area Telescope (LAT) threshold of ∼20 MeV. GBM employs twelve sodium iodide scintillation etectors and two bismuth germinate scintillation detectors to observe the full unocculted sky. The flight software ocalizes GRBs and can generate a request to autonomously repoint the spacecraft to place a burst within the LAT field of iew. GBM has a trigger threshold of 0.74 photons-cm -2-s-1 and triggers on ∼260 bursts per year, as well as a variety of ther gamma-ray transients. © 2009 American Institute of Physics
