GCN Circular 30205
Subject
GRB 210610B: optical afterglow observations
Event
Date
2021-06-11T17:14:07Z (5 years ago)
From
Paul Vreeswijk at Radboud U/Nijmegen <p.vreeswijk@astro.ru.nl>
P.M. Vreeswijk (Radboud) reports on behalf of E. Broens (Mol, Belgium):
���I observed the field of GRB 210610B (Page et al., GCN 30170; Kumar et
al., GCN 30174; Rumyantsev et al., GCN 30175; Hu et al., GCN 30177; de
Wet et al., GCN 30180; Romanov et al., GCN 30181, GCN 30182; Fynbo et
al, GCN 30182; Moskvitin, GCN 30187) using a 0.28-meter f7 SCT
telescope with a Moravian G2-1600 CCD camera and Astrodon
Johnson-Cousins BVRcIc filters.
Five 180 s exposures were average combined for each filter. In the B
filter the OT was only marginally detected with a SNR ~3. The
following magnitudes were measured using eight APASS DR9 stars in the
field. The APASS DR9 r��� and i��� magnitudes were transformed to Rc and
Ic using the Jester et al. (2009, AJ 130, 873) relations.
2021-06-10 23:50:30 UT Rc 17.20 +/- 0.07
2021-06-11 00:05:37 UT V 17.74 +/- 0.09
2021-06-11 00:20:20 UT Ic 16.8 +/- 0.2
2021-06-11 00:36:00 UT B 18.4 +/- 0.2
2021-06-11 00:51:50 UT Rc 17.25 +/- 0.08
2021-06-11 01:06:23 UT V 17.71 +/- 0.09"