GCN Circular 33155

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

Analysis of AstroSat LAXPC data showed the clear detection of a long

GRB 230106. The lightcurve shows the multiple burst profile with the 
peak triggered

at T0 = 00h 55m 22s UT on 06 Jan 2023. The satellite was in a normal 
operating mode

and well before the entry into the SAA region. The lightcurve has a 
burst profile with

T90 =~ 77 sec. The strongest peak measured has a count rate above the 
background

with 876 +/- 35 count/sec in LAXPC10 and 1083 +/- 36 count/sec in 
LAXPC20 at T0+23 sec.

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 the lower gain

in LAXPC10 the energy range is about 30-400 keV.

The background subtracted lightcurve with 1 sec time-bin is available at 
the website:

https://www.tifr.res.in/~astrosat_laxpc/grb230106lc.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.