GCN Circular 3124
Subject
GRB050319: BR optical photometry
Event
Date
2005-03-20T06:17:12Z (21 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
D. Sharapov, M. Ibrahimov, R. Karimov, B. Kahharov (UBAI), A.Pozanenko
(IKI), V.Rumyantsev (CrAO), G.Beskin (SAO) report:
We observed afterglow candidate of Swift GRB050319 (Rykoff et al. GCN
3116, Krimm et al. GCN 3117) with 1.5m telescope of Mt.Maidanak
high-altitude observatory. BR-band images were taken in two sets of
observation on (UT) March 19, 17:14 --17:58 and 19:18 -- 21:45. We confirm
a fading afterglow (Yoshioka et al. GCN 3120). Preliminary photometry
against of USNO-B1.0 Catalog is following:
Mean time Exposure Filter Mag.
(UT) (s)
Mar.19 17:28 900 B 20.85
Mar.19 17:31 1500 R 20.12
Mar.19 20:17 1800 B 21.29
Mar.19 20:16 4800 R 20.17
with typical magnitude error of less than 0.10.
B-R at the two epochs marginally indicate color variation which is not
typical for this phase of afterglow.
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