Using GRB 080723B to cross-calibrate Fermi/GBM and INTEGRAL
Abstract
On July 23, 2008 GRB 080723B, a bright GRB lasting about 105 s was detected by the INTEGRAL burst alert system. This burst was also detected by the Fermi Gamma-ray burst monitor. At this time no Fermi/GBM GCN notices were distributed to the public because Fermi was still in commissioning phase. The simultaneous detection of a bright GRB by both satellites gives us the opportunity to cross-calibrate the GBM with the already well-calibrated instruments on-board INTEGRAL, the Spectrometer SPI and the Imager IBIS. Time-resolved spectroscopy of this long and structured GRB is of special importance because Fermi was slewing during the GRB was still ongoing. In this paper we present a first and still preliminary analysis of the GBM spectra and compare them to those obtained by SPI for the same selection of time intervals. A more accurate cross-calibration will be forthcoming when the improved in-flight calibration of GBM is available and the corresponding data and responses can be reprocessed.
- Publication:
-
Gamma-ray Burst: Sixth Huntsville Symposium
- Pub Date:
- May 2009
- DOI:
- 10.1063/1.3155949
- Bibcode:
- 2009AIPC.1133..446V
- Keywords:
-
- 98.70.Rz;
- 95.55.Ka;
- 29.40.-n;
- gamma-ray sources;
- gamma-ray bursts;
- X- and gamma-ray telescopes and instrumentation;
- Radiation detectors