GCN Circular 10402
Subject
GRB 100212A: candidate optical afterglow
Date
2010-02-12T21:32:58Z (14 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
D. Malesani, G. Leloudas, J. P. U. Fynbo (DARK/NBI), D. Xu (WIS and
DARK/NBI), P. Jakobsson (Univ. Iceland), A. Somero, S. Katajainen
(Tuorla Obs.), T. Pursimo (NOT), report on behalf of a larger collaboration:
We observed the field of GRB 100212A (Grupe et al., GCN 10401) with the
NOT equipped with ALFOSC. Observations started on Feb 12.841 UT (6.05 hr
after the GRB), in the R band.
Close to the refined XRT error circle (as reported in the SPER web page
http://www.swift.ac.uk/sper/index.php at 21:30 UT), we detect a source
which is not visible in the DSS. Its coordinates are (J2000):
RA = 23:45:40.23
Dec = +49:29:40.7
The object is 2.5" away from the centre of the XRT position, currently
reported to have a 2.2" error radius.
The R-band magnitude of the source is R = 20.3 assuming R = 17.3 for the
USNO star at RA = 23:45:42.93, Dec = +49:30:29.3. The source looks
pointlike under a seeing of 1" and is clearly brighter than other
closeby objects visible in the DSS.
We suggest this object to be the afterglow of GRB 100212A.