GCN Circular 26887
Subject
GRB 200125A: TNG detection of a NIR counterpart candidate
Date
2020-01-26T13:33:30Z (4 years ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
A. Melandri, P. D'Avanzo (INAF-OAB), V. D���Elia (ASI-SSDC), W. Boschin, G. Mainella (INAF-TNG)
on behalf of the CIBO collaboration report:
We observed the field of GRB 200125A (Lien et al., GCN Circ. 26876) with the Italian 3.58m TNG telescope
equipped with NICS in imaging mode. A series of images were obtained with the Ks and J filters on 2020-01-26
from 05:25 to 06:39 UT (i.e. from about 17.9 to 19.1 hours after the burst).
We detect a source at the following coordinates:
RA(J2000), Dec (J2000) = 15:12:11.30, -08:08:38.5 (+/- 0.5���).
This position is consistent with the most updated XRT localisation (https://www.swift.ac.uk/xrt_positions/ <https://www.swift.ac.uk/xrt_positions/>). We assume
this is the same source detectd in the optical by Watson et al. (GCN Circ. 26882).
From preliminary photometry, we estimate for this object a magnitude Ks ~ 17.2 (Vega, calibrated assuming K = 12.1
for the 2MASS star at RA(J2000), Dec (J2000) = 15:12:05.10, -08:07:06.9).
[GCN OPS NOTE(26jan20): Per OPS, the Circular referenced in the first sentence (26976) was changed to 26876).]