Skip to main content
Announcing GCN Classic Migration Survey, End of Legacy Circulars Email. See news and announcements

GCN Circular 28288

Subject
GRB 200826A: AstroSat CZTI detection
Date
2020-08-26T19:40:25Z (4 years ago)
From
Soumya Gupta at IUCAA/ASTROSAT <soumya@iucaa>
S. Gupta, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:

Analysis of AstroSat CZTI data showed the detection of a bright short GRB 200826A, which was also detected by Fermi GBM (GCN #28284), Global MASTER-Net (Lipunov V. et al., GCN #28285) and BALROG (Kunzweiler F. et al., GCN #28286).

The source was clearly detected in the 40-200 keV energy range. The light curve showed a single peak of emission peaking at 2020-08-26 04:29:51.529 UT. The measured peak count rate associated with the burst is 686 +/- 34 cts/s above the background in the combined data of four quadrants, with a total of 1383 +/- 10 cts. The local mean background count rate was 537 +/- 2 cts/s. Using cumulative rates, we measure a T90 of 1.95 +/- 0.01 s.

It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed a single peak of emission peaking at 2020-08-26 04:29:51.000 UT. The measured peak count rate is 735 +/- 53 cts/s above the background in the combined Veto data of four quadrants, with a total of 1043 +/- 42 cts. The local mean background count rate was 1870 +/- 16 cts/s.  We measure a T90 of 2.17 +/- 0.23 s from the cumulative Veto light curve.

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.
Looking for U.S. government information and services? Visit USA.gov