TITLE:   GCN CIRCULAR
NUMBER:  22515
SUBJECT: GRB 180314A: AstroSat CZTI detection
DATE:    18/03/17 21:15:29 GMT
FROM:    Vidushi Sharma at IUCAA  <vidushi@iucaa.in>

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 the detection of a bright GRB 180314A, which was also detected by Swift (D'Avanzo P. et al., GCN 22478) and Fermi-GBM (Bissaldi E. et al., GCN 22485).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 00:43:20.5 UT. The measured peak count rate is 339.5 cts/s above the background in combined data of four quadrants, with a total of 5127 cts. The local mean background count rate was 586.5 cts/s. Using cumulative rates, we measure a T90 of 37.3 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.