GCN Circular 20673
Subject
GRB 170208B: IRSF upper limits
Date
2017-02-14T07:28:56Z (7 years ago)
From
Katsuhiro L. Murata at Nagoya U <murata@u.phys.nagoya-u.ac.jp>
K. L. Murata (Nagoya U), L. Townsend (UCT), I. Monageng (SAAO), Y. Moritani
(Kavli IPMU), M. Jian (U of Tokyo), S. Chimasu (Tokai U), A. Kawachi (Tokai
U), A. Okazaki (Hokkai-Gakuen U) and T. Nagayama (Kagoshima U)
We observed the field of GRB 170208B (Siegel et al., GCN Circular #20632)
with the near-infrared (J, H, Ks) simultaneous imaging camera SIRIUS
attached to 1.4 m telescope IRSF (InfraRed Survey Facility) in Sutherland
observatory, South Africa.
The observations started on 2017-02-08 22:49:41 UT (~ 15 min. after the
burst). We could not detect the afterglow within the enhanced XRT error
circle (Goad et al., GCN Circular #20635) in the three bands. We have
obtained the following preliminary upper limits (Vega magnitude system):
J > 16.83
H > 16.31
Ks > 16.30
Given magnitudes were calibrated against 2MASS point sources in this field.
The upper limits were determined as the magnitudes of the faintest star
within 1 arcmin from the enhanced XRT position.
This observation was carried out by IRSF and OISTER collaboration.