GCN Circular 6981
Subject
Optical observations of GRB 071020
Event
Date
2007-10-23T11:25:46Z (18 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Veli-Pekka Hentunen (Taurus Hill Observatory, Varkaus, Finland) reports to
the AAVSO International High Energy Network the following optical
observations of GRB071020 (GCN #6949, Holland et al.):
Markku Nissinen, Henri Taino and Veli-Pekka Hentunen report the detection
of the optical afterglow of GRB 071020 (Holland et al., GCN 6949; Schaefer
et al., GCN 6948; Yuan et al., GCN 6951; Xin et al., GCN 6956). The
afterglow was observed unfiltered approximately 17 hours post-burst, using
a 0.3-meter Meade LX200 at Taurus Hill Observatory. The source was
detected with marginal signal to noise at an unfiltered magnitude of 20.9
+/- 0.3, with an observational mid-point time of 2007 October 20, 23:54:37
UT. The magnitude is calibrated relative to GSC 0247201072 (GSC1.2) with
a magnitude of 13.54. The afterglow magnitude is consistent with an
earlier observation by Xin et al. (GCN 6956) as well as with a later
observation by Im et al. (GCN 6970).
The AAVSO thanks the Curry Foundation for their continued support of the
AAVSO International High Energy Network.
[GCN OPS NOTE(23oct07): Per submiter's request, "6979" was changed to "6949"
in th 3rd line.]