TITLE:   GCN CIRCULAR
NUMBER:  27164
SUBJECT: GRB 200219A: FRAM-Auger optical limit
DATE:    20/02/21 16:41:40 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek@asu.cas.cz>

Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ),
Martin Masek, Petr Janecek, Sergey Karpov, Jakub
Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and
Michael Prouza (Institute of Physics, Prague, CZ)

report:

The 30cm robotic telescope FRAM-Auger in Malargue
(Argentina) reacted robotically to the Swift/BAT alert
of GRB200219A (Lien et al., GCNC 27125, D'Elia et al.,
GCNC 27139, and Bissaldi et al., GCNC 27137), starting
with a series of 20s unfiltered images at 07:43:16 UT,
i.e. 6.45 min post trigger.

We do not detect any new or strongly variable source at
or around the reported gamma-ray errorbox at single
frames or a combined 20 x 20s image taken between 6.45
min and 15.39 min after the initial trigger. The
combined exposure has a limiting magnitude r'(AB) =
18.9, as calibrated against the APASS Catalogue.