GCN Circular 31976
Subject
GRB 220430A: Mondy and AbAO optical upper limits
Date
2022-04-30T21:25:52Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (HSE), S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko
(ISTP), R. Ya. Inasaridze (AbAO) report on behalf of GRB IKI FuN:
We observed the field of Swift GRB 220430A (Ambrosi et al., GCN 31972)
also detected by AGILE (Ursi et al., GCN 31975) with AZT-33 telescope
of Mondy observatory starting on April, 30 (UT) 14:20:53 and AS-32
telescope of Abastumani observatory starting on April, 30 (UT)
16:59:12. We do not detect any sources in the enhanced position of
Swift-XRT (Osborne et al., GCN 31973) consistent with the observations
of Swit/UVOT (Ambrosi et al., GCN 31972) and MeerLICHT (Groot et al.,
GCN 31974).
Preliminary photometry of the combined images is following
Date, UT start, t-T0, Exp., Filter, OT, Err, UL(3 sigma)
(mid, days)
2022-04-30 14:20:53 0.01953 1*60 R n/d n/d 19.5
2022-04-30 14:20:53 0.02613 20*60 R n/d n/d 20.5
2022-04-30 16:59:12 0.14962 59*60 R n/d n/d 21.0
The photometry is based on nearby USNO-B1.0 stars, R2 magnitude
USNO-B1.0_id R2
0995-0113632 16.50
0995-0113723 15.94