GRB 200506C: AstroSat CZTI detection

Analysis of AstroSat CZTI data showed the detection of a long GRB 200506C, which was also detected by Fermi GBM (GCN #27692). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 2020-05-06 09:41:37.093 UT. The measured peak count rate associated with the burst is 307 +/- 25 cts/s above the background in the combined data of four quadrants, with a total of 9495 +/- 228 cts. The local mean background count rate was 547 +/- 1.0 cts/s. Using cumulative rates, we measure a T90 of 205.8 +/- 0.04 s. In preliminary analysis, we find that 756 Compton events are associated with this event. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. 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.