[vsnet-grb-info 18920] GRB 170105A: AstroSat CZTI detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20389
SUBJECT: GRB 170105A: AstroSat CZTI  detection
DATE:    17/01/07 13:28:52 GMT
FROM:    Vidushi Sharma at IUCAA  <vidushi at iucaa.in>

V. Sharma,  V. Bhalerao and D. Bhattacharya (IUCAA), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:

Analysis of AstroSat CZTI data showed clear detection of GRB170105A (POLAR Observation: R. Marcinkowski et al., GCN Circ. 20387) in the 40-200 
keV energy range. The light curve shows a single peak structure with main peak at 06:14:06 UT in the quadrant A and B only,  ~1 sec before the 
POLAR trigger at 06:14:07 UT. The measured peak count rate is 305.46 counts/sec above the background in combined data of four quadrants, with a 
total of 762 counts. The local mean background count rate was 287.54 counts/sec. Using cumulative rates, we measure a T90 of 2.86 secs. 
 
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.