[vsnet-grb-info 25140] GRB 200224A: Mondy optical upper limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Feb 28 01:30:10 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 27240
SUBJECT: GRB 200224A: Mondy optical upper limit
DATE: 20/02/27 16:28:46 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI),
A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200224A (Ukwatta et al., GCN 27173; Fermi
GBM team GCN 27174) with AZT-33IK telescope of Sayan observatory (Mondy)
starting on Feb. 26 (UT) 17:24:49. We did not detect the optical
afterglow (Sota et al., GCN 27176; Stecklum et al., GCN 27177; Marshall
et al., GCN 27182; Becerra et al., GCN 27182; Fernandez et al., GCN
27222). Preliminary photometry of the field is following.
Date UT start, t-T0 Filter Exp. OT UL(3sigma)
(mid, days) (s)
2020-02-26 17:24:49 2.60348 R 29*120 n/d 22.6
Photometry is based on the USNO-B1.0 nearby stars.
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