TITLE: GCN CIRCULAR NUMBER: 27313 SUBJECT: GRB200210A AstroSat observations DATE: 20/03/04 04:52:33 GMT FROM: Tilak Katoch at TIFR H. M. Antia, Tilak Katoch, Parag Shah, Dhiraj Dedhia (TIFR), S. Gupta, R. Gaikwad, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA) on behalf of the AstroSat LAXPC and CZTI collaboration report: Analysis of AstroSat LAXPC and CZTI data showed the detection of a long GRB 2002010A. The source was clearly detected in the 3-400 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-02-10 08:03:40.00 UT. The measured peak count rate above the background associated with the burst is 354 +/- 29 cts/s in LAXPC10 and 197 +/- 21 in LAXPC20, with a total of 5524 +/- 143 cts in LAXPC10 and 3384 +/- 99 in LAXPC20. LAXPC20 has a nominal energy range of 3-100 keV but due to lower gain in LAXPC10 the energy range is about 30-400 keV. The background subtracted light curve with 1 sec time-bin in LAXPC detectors is available at the web-site: https://www.tifr.res.in/~astrosat_laxpc/grb200210lc.jpg The measured peak count rate associated with the burst in CZTI is 288 +/- 29 cts/s above the background in the combined data of four quadrants, with a total of 6338 +/- 67 cts. The local mean background count rate was 533 +/- 15 cts/s. Using cumulative rates, we measure a T90 of 29.2 +/- 0.01 s. CZTI operates in the energy range of 40-200 keV. 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. LAXPC is built by TIFR in collaboration with the Indian Space Research Organisation. 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.