//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32231 SUBJECT: GRB 220619A: AstroSat CZTI detection DATE: 22/06/20 04:59:25 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 the detection of a long GRB 220619A which was also detected by Fermi GBM (TrigNum: 677307509). The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2022-06-19 04:58:41.500 UTC. The measured peak count rate associated with the burst is 139 (+37, -18) counts/s above the background in the combined data of three (out of four) quadrants, with a total of 2456 (+577, -573) counts. The local mean background count rate was 320 (+2, -3) counts/s. Using cumulative rates, we measure a T90 of 47 (+20, -15) s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2022-06-19 04:58:42.035 UTC. The measured peak count rate is 333 (+70, -39) counts/s above the background in the combined Veto data of all quadrants, with a total of 6930 (+826, -1099) counts. The local mean background count rate was 1405 (+3, -3) counts/s. We measure a T90 of 55 (+15, -18) 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32232 SUBJECT: Integral GRB220619.53: Global MASTER-Net observations report DATE: 22/06/20 05:19:24 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Integral GRB220619.53 (trigger No 9962,19h 34m 57.38s , +21d 51m 05.1s, R=0.0546667) errorbox 6676 sec after notice time and 6687 sec after trigger time at 2022-06-19 14:37:50 UT, with upper limit up to 12.2 mag. Observations started at twilight. The observations began at zenith distance = 41 deg. The sun altitude is -15.6 deg. MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) was pointed to the Integral GRB220619.53 errorbox 49078 sec after notice time and 49090 sec after trigger time at 2022-06-20 02:24:33 UT, with upper limit up to 14.8 mag. The observations began at zenith distance = 77 deg. The sun altitude is -59.9 deg. MASTER-OAGH robotic telescope located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) was pointed to the Integral GRB220619.53 errorbox 58727 sec after notice time and 58739 sec after trigger time at 2022-06-20 05:05:21 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 53 deg. The sun altitude is -26.7 deg. The galactic latitude b = 0 deg., longitude l = 58 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2010368 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 6777 | MASTER-Amur | P\ | 180 | 12.2 | 49180 | MASTER-OAFA | C | 180 | 14.8 | 58829 | MASTER-OAGH | C | 180 | 18.5 | 58829 | MASTER-OAGH | C | 180 | 18.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.