GCN Circular 17399
Subject
GRB 150203A: ISON-NM early optical limit
Date
2015-02-04T11:46:45Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Volnova (IKI), E. Mazaeva (IKI), I. Molotov (KIAM),
A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150203A (Ukwatta et al., GCN 17377)
with 0.4-m telescope of ISON-NM observatory in robotic mode starting on
Feb., 03 (UT) 04:10:19 i.e. 72 seconds after burst trigger. We obtained 60
unfiltered images of 30 s exposure. We do not detect any source within
enhanced XRT error circle (Evans et al., GCN 17384):
Date UT start t-T0 Exp. Filter UL (3sigma)
(mid.,days) (s)
2014-02-03 04:10:19 0.00130 2*30 Clear 18.0
2014-02-03 04:10:19 0.01836 60*30 Clear 19.7
The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0 RA Dec R2
0968-0105340 06:33:22.23 +06:53:43.2 15.41
0969-0108800 06:33:26.73 +06:56:58.4 14.77
0969-0108730 06:33:22.76 +06:55:10.3 15.73