GCN Circular 27122
Subject
GRB 200216B: Mondy and AbAO optical upper limits
Date
2020-02-18T16:01:19Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), S. Belkin (IKI), E. Klunko (ISTP), R. Ya.
Inasaridze (AbAO), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov
(KIAM) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200216B (D'Avanzo et al. GCN 27102; Fermi
GBM team, GCN 27101) with AZT-33IK telescope of Sayan observatory
(Mondy) starting on Feb. 16 (UT) 13:47:34 i.e. 15 minutes after GRB
trigger. We also observed the GRB 200216B with AS-32 (0.7m) telescope of
Abastumani Observatory starting on Feb. 16 (UT) 20:00:20. We do not
detect any object in the enhanced Swift-XRT position (Goad et al. GCN
27106). In particular we do not detect possible IR-counterpart (Levan et
al., GCN 27114). Preliminary photometry of the field is following.
Date UT start t-T0 Filter Exp. OT UL(3sigma)
(mid, days) (s)
2020-02-16 13:47:34 0.06915 R 30*60 n/d 22.0
2020-02-16 20:00:20 0.29256 R 67*60 n/d 21.8
Photometry is based on the USNO-B2.0 nearby stars.
We note the presense the optical object at coordinates (J2000)
10:41:44.54 +19:28:19.3 and brightess of R=21.75 +/- 0.25 at 0.06915
days (mid time) after triger, and do not detect the object in the secod
epoch R > 21.8 at 0.29256 days. The object is absent in both SDSS ans
Pan-SARRS catalogues. The object is apart 14.5 arcsec from center of
enhanced XRT erro circle (Goad et al. GCN 27106) and the object lies
within 90% BAT ground-calculated position (Krimm et al., GCN 27117).