GRB 200216B
GCN Circular 27128
Subject
GRB 200216B: second epoch optical upper limit at Mondy observatory
Date
2020-02-19T12:01:00Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@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 200216B (D'Avanzo et al., GCN 27102: Fermi
GBM team, GCN 27101) with AZT-33IK telescope of Sayan observatory
(Mondy) starting on Feb. 18 (UT) 16:02:31. We did 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). Upper limit is 22.8R.
We detected the object reported earlier (Pozanenko et al., GCN 27122)
with coordinates (J2000) 10:41:44.54 +19:28:19.3 which is 14.5 arcsec
apart from center of enhanced XRT error circle (Goad et al., GCN 27106).
Preliminary photometry of the object is following:
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2020-02-18 16:02:31 2.12497 R 30*120 22.7 0.3 22.8
Power law index of a light curve of the object calculated between the
two epochs is about -0.3. Therefore the object might not be related to
GRB 200216B.
GCN Circular 27122
Subject
GRB 200216B: Mondy and AbAO optical upper limits
Date
2020-02-18T16:01:19Z (6 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).
GCN Circular 27120
Subject
GRB 200216B: Swift-XRT refined Analysis
Date
2020-02-18T10:07:24Z (6 years ago)
From
Paolo D'Avanzo at INAF - OAB <paolo.davanzo@inaf.it>
P. D'Avanzo (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf
of the Swift-XRT team:
We have analysed 1.6 ks of XRT data for GRB 200216B (D'Avanzo et al.
GCN Circ. 27102), from 105 s to 1.7 ks after the BAT trigger. The data
comprise 90 s in Windowed Timing (WT) mode (the first 8 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Goad et al.
(GCN Circ. 27106