GCN Circular 7519
Subject
GRB080319B: optical observations
Event
Date
2008-03-25T21:41:49Z (18 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Yu. Krugly, I. Slyusarev (Institute of Astronomy of Kharkiv National
University), A. Pozanenko (IKI) report on behalf of larger collaboration:
We observed the afterglow of GRB080319B (Racusin et al. GCN 7427) with 0.7m
telescope of Institute of Astronomy, Kharkiv National Univ. starting on (UT)
March 19, 18:20 and continuing to March 20, 02:44. The series consist of
continuous observations in R and a few frames were taken in V around (UT)
19:58.
The afterglow (Racusin et al. GCN 7427, Holland et al. GCN 7428, Li et al.
GCN 7430) is detected in the obtained single images.
Preliminary photometry of combined images reveals a possible rapid decline
of the light curve between (UT, mid time) 18:25 (R~19.1) and 19:04 (R~19.9)
and then light curve flattering toward the end of observation March 20 (UT)
02:00 (R~20.1). The light curve between (UT) 19:00 and 02:39 is close to a
constant and not compatible with power law decay index of alpha=1.2.
The magnitude of the comparison star is based on SDSS calibration (Cool et
al, GCN 7465).
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