Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 25287

GRB 190805B: AstroSat CZTI detection
2019-08-08T11:27:52Z (5 years ago)
Prachee Ghumatkar at IUCAA/AstroSat <>
P. Ghumatkar, V. Sharma and D. Bhattacharya and A. Vibhute (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 190805B, which was also detected by Fermi GBM Final Real-time Localization (GCN #25270), MAXI/GSC detection (Sato T. et al., GCN #25271), BALROG localization (Biltzinger B. et al., GCN #25272), Tiled Swift observations (Evans P. A. et al., GCN #25275), Fermi GBM detection (Hamburg R. et al., GCN #25277), Swift-XRT (Perri M. et al., GCN #25279) and Konus-Wind (Kozlova A. et al., GCN #25285).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with the strongest peak at 04:46:05.0 UT. The measured peak count rate associated with the burst is 323 cts/s above the background in the combined data of four quadrants, with a total of 4289 cts. The local mean background count rate was 588 cts/s. Using cumulative rates, we measure a T90 of 24 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 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.
Looking for U.S. government information and services? Visit