TITLE:   GCN CIRCULAR
NUMBER:  26851
SUBJECT: GRB 200120A: AstroSat CZTI detection
DATE:    20/01/22 12:06:37 GMT
FROM:    Ramkrishna Gaikwad at IUCAA/AstroSat  <ramkrishna@iucaa.in>

R. Gaikwad, S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:

Analysis of AstroSat CZTI data showed a weak detection of a long GRB 200120A, which was also detected by Fermi GBM Final Real-time Localization (GCN #26831) and IceCube (Lagunas C. et al., GCN #26832).

The source was clearly detected in the 40-200 keV energy range. The light curve showed a single peak of emission peaking at 2020-01-20 23:04:55.0 UT. The measured peak count rate associated with the burst is 156 cts/s above the background in the combined data of four quadrants, with a total of 805 cts. The local mean background count rate was 678 cts/s. Using cumulative rates, we measure a T90 of 9.8 s.

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.