V. Sharma, A. Vibhute 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 long GRB 180806A, which was also detected by Fermi-GBM (Malacaria C. et al., GCN 23095) and Konus-Wind (Tsvetkova A. et al., GCN 23119).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 22:39:04.500 UT. The measured peak count rate is 994 cts/s above the background in combined data of four quadrants, with a total of 9327 cts. The local mean background count rate was 498 cts/s. Using cumulative rates, we measure a T90 of 25.8 s. In preliminary analysis, we find that 623 compton events are associated with this event.
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.