GCN Circular 16264
Subject
GRB 140423A: AAO optical upper limits
Event
Date
2014-05-14T14:27:00Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), R. Inasaridze (AAO), O. Kvaratskhelia (AAO), V.
Ayvazian (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the optical afterglow (Elenin et al., GCN 16143; Kaur et
al., GCN 16144; Ferrante et al., GCN 16145; Chester et al., GCN 16147;
Maehara et al., GCN 16151) of the Swift GRB 140423A (Sonbas et al., GCN
16142) with AS-32 (0.7m) telescope of Abastumani Observatory on Apr. 24
at (UT) 00:29-01:16 and Apr. 24 (UT) 17:46-19:16. We obtained several
unfiltered frames with exposures of 120 s. Within the enhanced XRT
circle (Beardmore et al., GCN 16155) in the stacked images from both
epochs we do not detect the afterglow.
The details of the photometry are the following:
UT start t-T0 Filter Exp. Uplim
(mid, days) (s) (3 sigma)
00:29:23 0.68139 None 16*120 20.3
The photometry is based on SDSS stars, R mag (R mag obtained using ugriz
transformations in BVRI (Lupton, 2005):
SDSS id R_Lupton
J130858.37+494547.9 15.418 �� 0.018
J130914.51+494636.5 18.661 �� 0.019