GCN Circular 22345
Subject
GRB 180115A: NOT detection of optical counterpart
Date
2018-01-15T22:47:53Z (6 years ago)
From
Zach Cano at U of Iceland <zewcano@gmail.com>
Z. Cano (HETH/IAA-CSIC), K. E. Heintz (Univ. Iceland & DARK/NBI), A. de
Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), I. Marquez & S. Cazzoli
(IAA-CSIC) report on behalf of a larger collaboration:
We observed the field of GRB 180115A (Cannizzo et al.; GCN Circ. 22335)
with the 2.5-m Nordic Optical Telescope equipped with ALFOSC, starting at
19:40:26 UT on 15 January 2017. We obtained 3x300 s in the r-band. In our
co-added image a faint, new object is detected in the enhanced XRT error
circle (Goad et al.; GCN Circ. 22337), with an apparent magnitude of r =
21.3 +- 0.1, at a mean post-explosion epoch of +15.53 hours. The
calibration was performed using local Pan-STARRS standards in the GRB
field. This apparent magnitude is not corrected for foreground extinction.