GCN Circular 21163
Subject
GRB 170511A: AstroSat CZTI detection
Date
2017-05-30T09:20:19Z (8 years ago)
From
Vidushi Sharma at IUCAA <vidushi@iucaa.in>
V. Sharma (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration:
Analysis of Astrosat data showed the CZTI detection of a bright GRB 170511A which was also detected by MAXI/GSC (Takao et al., GCN 21137), CALET GBM (Yamaoka et al., GCN 21146) and Fermi GBM (E. Bissaldi et al., GCN 21161).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks emission with the strongest peak at 05:59:40.920 UT, ~30 s after the Fermi Trigger. The measured peak count rate is 515.9 cts/s above the background in combined data of four quadrants, with a total of 5191 cts. The local mean background count rate was 373 cts/s. Using cumulative rates, we measure a T90 of 36.6 s.
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.