GCN Circular 16141
Subject
GRB 140419A: Mondy optical observations
Event
Date
2014-04-22T14:44:54Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), I. Korobtsev
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the Swift GRB 140419A (Marshall et al., GCN
16118) with AZT-33IK telescope of Sayan observatory (Mondy) on Apr.
19-21. We took several images in R-filter of 60 s exposure. On stacked
images we clearly detected the optical afterglow (Zheng et al., GCN
16119; Guver et al., GCN 16120; Butler et al., GCN 16121; Kuin et al.,
GCN 16123; Hentunen et al., GCN 16126) except the combined image of
Apr. 19 due to unfavorable weather conditions. Our photometry is
consistent with the decaying law derived from RATIR observations
(Littlejohns et al., GCNs 16139, 16136).
The details of the photometry are the following:
date UT start t-T0 Filter Exp. OT Uplim
(mid, days) (s) 3sigma
2014-04-19 16:26:35 0.52030 R 10*60 n/d 19.3
2014-04-20 14:49:15 1.47495 R 83*60 21.12 +/- 0.10 21.6
2014-04-21 14:58:36 2.49015 R 107*60 21.60 +/- 0.15 22.2
The photometry is based on nearby SDSS star, R (gri -> R transformations
by Lupton 2005):
SDSS id R
J082752.69+461357.4 17.381 +/- 0.018