GCN Circular 17341
Subject
GRB 150120A: ISON-NM early optical limit
Date
2015-01-21T18:22:16Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov
(KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the Swift GRB 150120A (D'Elia et al.,
GCN 17310) with 0.4-m telescope of ISON-NM observatory in robotic mode
starting on Jan., 20 (UT) 02:58:58, 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 17317):
Date UT start t-T0 Exp. Filter UL (3sigma)
(mid.,days) (s)
2015-01-20 02:58:58 0.00227 5*30 Clear 19.0
2015-01-20 02:58:58 0.01950 60*30 Clear 20.2
The photometry is based on nearby SDSS DR9 stars
SDSS9_id R_Lupton
J004136.43+340051.9 15.61
J004135.94+335950.0 14.56
J004101.23+335851.1 15.84