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GCN Circular 29651

GRB210312B (Integral alert 9073): Candidate optical afterglow by Ondrejov D50
2021-03-12T22:05:41Z (3 years ago)
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <>
M. Jelinek, J. Strobl, S. Trcka, R. Hudec, C. Polasek (ASU CAS Ondrejov)

We observed the position of the Integral trigger 9073 (GRB 210312.87 or B)
with the D50 robotic telescope of the Astronomical Institute Ondrejov, near
Prague, Czech Republic. We performed a series of 10s and 20s unfiltered
exposures starting 23.8 s after the trigger.

In the first images we detect a rapidly fading object not present in the
DSS catalogue at 10:23:15.312 +76:52:06.96 J2000.  The preliminary
magnitude of the
object in the earliest images was R~18m.
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