GCN Circular 11082
Subject
GRB 100802A: further NOT observation
Date
2010-08-12T10:37:13Z (14 years ago)
From
Dong Xu at DARK,NBI <dong@astro.ku.dk>
Nis B. Andreasen, Maria Cavallius, Louise Dyregaard Nielsen,
Christopher Groenbech, Simone J. Jakobsen, Jonatan Selsing,
Lasse Oedegaard (Niels Bohr Inst.), Johan P.U. Fynbo,
Daniele Malesani (DARK/NBI), Dong Xu (Weizmann Inst.),
and Pall Jakobsson (Univ. Iceland), report on behalf
of a larger collaboration:
We observed the field of GRB 100802A (Troja et al., GCN 11031, Siegel
& Troja, GCN 11032) with the NOT equipped with ALFOSC. Observations
were carried out with mean time Aug 11.10 UT (212.7 hr after the GRB).
The object seen in our early-time NOT image (Xu et al., GCN 11042) is
barely detected in the new stacked image, and has decayed by 1.3 +/-
0.4 mag between the two epochs.
We note that the NOT object is slightly offset (by ~1.1" W) with
respect to the UVOT position (GCN 11032; also confirmed by P60
imaging; B. Cenko, priv. comm.). Coupled to the slow decay, this may
indicate the presence of an underlying constant source of light, which
could be the host galaxy or a foreground, unrelated object.
An image showing the two epochs is available at the following URL:
http://www.astro.ku.dk/~malesani/GRB/100802A/GRB100802A_epoch2.jpg
Given the relative brightness of the underlying source (R ~ 23.7), we
encourage further photometric and spectroscopic observations.
[GCN OPS NOTE (12aug10): Per author's request, MC was added to the author list.]
