GCN Circular 29653
Subject
GRB 210312B: GTC photometry
Date
2021-03-13T00:51:28Z (3 years ago)
From
Alexander Kann at IAA-CSIC <kann@iaa.es>
D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC,
DARK/NBI), C. C. Thoene, M. Blazek, J. F. Agui Fernandez (all
HETH/IAA-CSIC), and R. Scarpa (GTC) report:
We observed the afterglow (Jelinek et al., GCN #29651; Lipunov et al.,
GCN #29652) of INTEGRAL GRB 210312B (Mereghetti et al., GCN #29650) with
OSIRIS at the 10.4m Gran Telescopio Canarias (Roque de los Muchachos
Observatory, La Palma, Canary Islands, Spain), starting at 2021-03-12
22:57:10.834 UT. We obtained a 60 s finding chart exposure under adverse
conditions (2" seeing, bad transparency because of Calima).
In the image, the afterglow is clearly detected. Against a nearby
PanSTARRS star, we measure r' = 21.52 +/- 0.06 mag at 2.0898 hr after
the trigger (0.08708 days).