GCN Circular 27821
Subject
GRB 200524A: CrAO optical observations
Date
2020-05-25T16:02:51Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO), A. Volnova
(IKI), E. Mazaeva (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed Fermi-LAT GRB 200524A (Dirirsa et al., GCN 27797; see also
Pookalil et al., GCN 27809; Capalbi et al., GCN 27811; Gupta et al.,
GCN 27818) with ZTSH 2.6m telescope of CrAO observatory starting on
2020-05-24 (UT) 19:35:16 (Rumyantsev et al., GCN 27802). Optical
afterglow discovered by ZTF (Ho et al., GCN 27799) and confirmed by
several observations (Kumar et al., GCN 27800; Rumyantsev et al., GCN
27802; Sanwal et al., GCN 27803; Perley et al., GCN 27805; Kumar et al.,
GCN 27806; de Ugarte Postigo et al., GCN 27807; Blazek et al., GCN
27810; Ogawa et al., GCN 27813; Izzo, GCN 27817). Preliminary photometry
of the afterglow is following
Date, UT start, t-T0, Exp., Filter, OT, Err., UL
(mid, days)
2020-05-24 19:35:16 0.60644 240 R 20.43 0.05 22.6
2020-05-24 19:39:28 0.60935 240 R 20.48 0.05 22.7
2020-05-24 19:43:39 0.61226 240 R 20.52 0.05 22.7
2020-05-24 19:47:52 0.61519 240 R 20.55 0.05 22.6
2020-05-24 19:52:03 0.61809 240 R 20.60 0.08 22.5
2020-05-24 19:56:15 0.62101 240 R 20.59 0.09 22.5
2020-05-24 20:00:27 0.62392 240 R 20.60 0.09 22.3
The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1508-0206198 15.78
1509-0204466 16.48
1509-0204434 16.53