Soft Gamma-Ray Spectral and Time evolution of the GRB 221009A: prompt and afterglow emission with INTEGRAL/IBIS-PICsIT
arXiv:2303.16943 · doi:10.1051/0004-6361/202346373
Abstract
The gamma-ray burst (GRB) 221009A, with its extreme brightness, has provided the opportunity to explore GRB prompt and afterglow emission behavior on short time scales with high statistics. In conjunction with detection up to very high-energy gamma-rays, studies of this event shed light on the emission processes at work in the initial phases of GRBs emission. Using INTEGRAL/IBIS's soft gamma-ray detector, PICsIT (200-2600 keV), we studied the temporal and spectral evolution during the prompt phase and the early afterglow period. We found a "flux-tracking" behavior with the source spectrum "softer" when brighter. However the relationship between the spectral index and the flux changes during the burst. The PICsIT light curve shows afterglow emission begins to dominate at ~ T0 + 630s and decays with a slope of 1.6 +/- 0.2, consistent with the slopes reported at soft X-rays.
arXiv comment6 pages, 4 figures, A&A Accepted
References in corpus (9)
- GRB 221009A, The BOAT
- Properties of the extremely energetic GRB~221009A from Konus-WIND and SRG/ART-XC observations
- GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst
- INTEGRAL Spectrometer SPI's GRB detection capabilities. GRBs detected inside SPI's FoV and with the anticoincidence system ACS
- Synchrotron Radiation Dominates the Extremely Bright GRB 221009A
- Bayesian Time-Resolved Spectroscopy of Multi-Pulsed GRBs: Variations of Emission Properties amongst Pulses
- INTEGRAL IBIS, SPI, and JEM-X observations of LVT151012
- The peak-flux of GRB 221009A measured with GRBAlpha
- The first GRB survey of the IBIS/PICsIT archive