GCN Circular 20107
Subject
GRB 161023A: LCOGT-FTS optical observations
Date
2016-10-24T10:30:23Z (8 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell
(U. Bath), A. Gomboc (U. Nova Gorica) on behalf of a large collaboration
report:
The 2-m LCOGT Faulkes Telescope South began observing INTEGRAL GRB
161023A (Mereghetti et al., GCN 20103) in the SDSS ri filters on October
24, 09:17 UT (~0.44 days since the GRB). We clearly detect the optical
afterglow (Gorbovskoy et al. GCN 20102; Tanvir al. GCN 20104) at the
position RA(J2000)= 20:44:05.17, DEC(J2000)= -47:39:47.8 (error radius
of 1 arcsec) with the following values:
Mid time from GRB Exposure Filter Magnitude
(days) (s)
-------------------------------------------------------------
0.44 5x60 SDSS-R 18.57 +- 0.03
0.45 5x60 SDSS-I 18.38 +- 0.03
-------------------------------------------------------------
Calibration is done against nearby USNOB-1 star 20:44:08.421,
-47:39:34.63 assuming r=17.27, i=17.20 mag.