TITLE: GCN CIRCULAR NUMBER: 32183 SUBJECT: GRB 220608A: AstroSat CZTI detection DATE: 22/06/09 03:23:52 GMT FROM: Gaurav Waratkar at IIT,Bombay R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed detection of a long GRB 220608A which was also reported by Fermi GBM (GCN 32178). The source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2022-06-08 05:03:45.50 UTC. The measured peak count rate associated with the burst is 294 (+43, -35) counts/s above the background in the combined data of three quadrants, with a total of 2720 (+389, -365) counts. The local mean background count rate was 393 (+1, -2) counts/s. Using cumulative rates, we measure a T90 of 36 (+11, -3) s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2022-06-08 05:03:44.45 UTC. The measured peak count rate is 483 (+71, -70) counts/s above the background in the combined Veto data of four quadrants, with a total of 4040 (+617, -645) counts. The local mean background count rate was 1621 (+4, -4) counts/s. We measure a T90 of 36 (+5, -10) 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, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.