Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 22364

GRB 180113B: AstroSat CZTI detection
2018-01-20T18:21:39Z (6 years ago)
Vidushi Sharma at IUCAA <>
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 bright GRB 180113B, which was also detected by Fermi-GBM (Veres P. et al., GCN 22329), Insight-HXMT/HE (Li C. K. et al., GCN 22342), IPN Triangulation (Svinkin D. et al., GCN 22354) and  Konus-Wind (Frederiks D. et al., GCN 22355).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 00:16:01.500 UT, ~1 s after the Fermi-GBM trigger. The measured peak count rate is 1344.6 cts/s above the background in combined data of four quadrants, with a total of 3534 cts. The local mean background count rate was 520 cts/s. Using cumulative rates, we measure a T90 of 10.8 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 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