GCN Circular 16318
Subject
GRB 140423A: TShAO optical observations
Event
Date
2014-05-22T16:23:31Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), A.V. Kusakin (Fesenkov Astrophysical Institute) A.V.
Khruslov (INASAN), 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 Zeiss-1000 (East) 1m telescope of Tien Shan Astronomical
Observatory on Apr., 23 and Apr., 24. We took several images in R-filter
of 300 and 540 s exposures in three epochs.
Details of the photometry are following:
date UT start t-T0 Filter Exp. OT
(mid, days) (s)
2014-04-23 R 15:04:19 0.291036 R 8*300 20.47 0.14
2014-04-23 R 19:04:44 0.450758 R 6*300 20.70 0.20
2014-04-24 R 15:20:01 1.322830 R 12*540 22.17 0.10
The photometry is based on SDSS stars, R (gri -> R transformations by
Lupton 2005):
SDSS id R
J130914.51+494636.5 18.661+/-0.019
J130911.04+494854.6 20.209+/-0.053
J130924.79+494946.6 19.533+/-0.038
The light curve of the afterglow based on our previous an later
observations (GCNs 16143, 16148, 16168, 16247, 16264) can be found in
http://grb.rssi.ru/GRB140423A/grb140423a-lc.png