[vsnet-grb-info 25354] GRB 200326B: AstroSat LAXPC detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27454
SUBJECT: GRB 200326B: AstroSat LAXPC detection
DATE:    20/03/27 12:41:54 GMT
FROM:    Tilak Katoch at TIFR  <tilak at tifr.res.in>

H. M. Antia, Tilak Katoch, Parag Shah and Dhiraj Dedhia
TIFR, Mumbai, India.

Analysis of AstroSat LAXPC data showed the detection of a long
GRB 200326B. The light curve showed a double peak profile
triggered at T0 = 21h 13m 52s UT on 26 Mar 2020, with T90=10 sec
for the first peak followed by a second smaller peak of similar
duration about 10 s later. The measured peak count rate above the
background associated with the burst is 158 +/- 24 cts/s in
LAXPC10 and 171 +/- 20 cts/s in LAXPC20 at T0+3 sec. The total
counts in the first peak are 542 +/- 71 cts in LAXPC10 and
773 +/- 54 in LAXPC20.

Both LAXPC instruments (LAXPC10 and LAXPC20) have registered this
burst profile in the light curve. For LAXPC20 the nominal energy
range is 3-100 keV, but due to lower gain in LAXPC10 the energy
range is about 30-400 keV.

The background subtracted light curve with 1 sec time-bin is
available at the web-site:
https://www.tifr.res.in/~astrosat_laxpc/grb200326blc.jpg

LAXPC was built by TIFR in collaboration with the Indian Space
Research Organisation. The Indian Space Research Organisation
funded, managed and facilitated the project.