GCN Circular 15304
Subject
GRB 131004A: optical afterglow from the NOT
Date
2013-10-04T22:44:30Z (11 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
D. Xu, D. Malesani, J. Hjorth (DARK/NBI), P. Jakobsson (Univ. Iceland),
T. Kruehler (ESO Santiago), Nicolaas Groeneboom, and Anders Hafreager
(Univ. Oslo), report:
We observed the field of GRB 131004A (Hagen et al., GCN 15303) using the
NOT equipped with AlFOSC. Consistent with the XRT position, we detect a
new source at coordinates:
RA = 19:44:27.08
Dec = -02:57:30.2
The source is not visible in the DSS, and brighter than its limiting
magnitude, hence it is very likely the afterglow of GRB 131004A. At a
time of 0.43 hr after the GRB, we measure R = 20.2 +- 0.1 mag compared
to nearby USNO-B1 R2 magnitudes, where the error is mostly due to
calibration.