GCN Circular 15290
Subject
GRB 131002A: ISON-NM optical observations
Event
Date
2013-10-02T19:06:52Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed optical transient(Guidorzi et al., GCN 15282) of the Swift
GRB 131002A (Barlow et al., GCN 15283) with 0.4-m SANTEL-400AN
telescope of ISON-NM observatory starting on Oct., 2 (UT) 06:55:23 (i.e.
58 s after burst trigger) in robotic mode. Series of 30 s exposures
were obtained in clear filter. After PSF subtraction of a nearby bright
star we clearly detect the optical transient in each single frames of
initial series. Coordinates of the optical transient are (J2000) 16 52
53.29 +82 03 15.6 with uncertainty of 0.25" in both coordinates.
Preliminary photometry is based on USNO-B1.0 (R2) stars. The maximum
brightness of the OT (15.2 +/- 0.05) was detected in the second frame
at 0.00141 days after trigger.
Light curve of the initial stage of the OT can be found at
http://grb.rssi.ru/GRB131002A/GRB131002A_ISON-NM_lc.png