GCN Circular 29527
Subject
GRB 210212A: REM early-time optical/NIR upper limits
Date
2021-02-18T10:12:02Z (3 years ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
P. D'Avanzo, S. Covino, D. Fugazza, A. Melandri (INAF-OAB) on behalf of the REM team, report:
We observed the field of GRB 210212A (Troja et al., GCN Circ. 29487) with the REM 60cm robotic
telescope located at the ESO premise of La Silla (Chile). The observations were performed starting
on 2021 February 12 at 04:27:01 UT (i.e. 103 seconds after the burst) at airmass 3.5 and were carried
in the g, r, i, z, H bands simultaneously.
From a preliminary analysis of the first set of images, obtained at a mid time of t-t0 = 150 s, we find no
source at the enhanced XRT position (Beardmore et al., GCN Circ. 29489) down to the following 3sigma
magnitude upper limits:
g > 18.2
r > 18.3
i > 17.4
z > 16.1
(AB; calibrated against the Pan-STARRS catalogue);
H > 15.8
(Vega; calibrated against the 2MASS catalogue).