GRB 220507A: AstroSat CZTI detection
Abstract
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 220507A which was also detected by Fermi-GBM (GCN #32009). The source was clearly detected in the 20-200 keV energy range. The light curve peaked at 2022-05-07 10:09:07.35 UT. The measured peak count rate associated with the burst is 466 (+188, -32) counts/s above the background in the combined data of three quadrants, with a total of 527 (+145, -147) counts. The local mean background count rate was 366 (+7, -10) counts/s. Using cumulative rates, we measure a T90 of 5 (+1, -1) s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaked at 2022-05-07 10:09:07.21 UT. The measured peak count rate is 647 (+73, -81) counts/s above the background in the combined Veto data of four quadrants, with a total of 1796 (+412, -458) counts. The local mean background count rate was 1500 (+5, -6) counts/s. We measure a T90 of 6 (+11, -3) s from the cumulative Veto light curve. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
- Publication:
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GRB Coordinates Network
- Pub Date:
- May 2022
- Bibcode:
- 2022GCN.32017....1G