GCN Circular 32096
Subject
GRB 220521A: REM optical/NIR upper limits
Event
Date
2022-05-23T20:14:11Z (4 years ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
M. Ferro, R. Brivio, A. Melandri, P. D'Avanzo, S. Covino, D. Fugazza, (INAF-OAB) on behalf of the REM team, report:
We observed the field of GRB 220521A (Fermi/GBM team GCN Circ. 32075; Dichiara et al., GCN Circ. 32076) with
the REM 60cm robotic telescope located at the ESO premise of La Silla (Chile). The observations were carried in the
g, r, i, z, J, H and K bands, starting on 2022 May 22 at 02:24:40 UT (i.e. about 3.1 hours after the burst) and lasting for
about one hour.
The optical afterglow (Malesani et al., GCN Circ. 32078) is not detected. From preliminary photometry we derive the
following magnitude upper limits (3sigma c.l.):
g > 19.5
r > 19.1
i > 18.8
z > 17.4
(AB; calibrated against the Pan-STARRS catalogue) at a mid time of t-t0 ~ 3.5 hours;
J > 16.6
H > 16.2
K > 13.5
(Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 ~ 3.9 hours.