GCN Circular 29181
Subject
ZTF20acozryr/AT2020yxz (GRB 201103B): Maidanak optical observations
Event
Date
2020-12-28T00:05:21Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), O. Burhonov (UBAI), R. Ya.
Inasaridze (AbAO), P. Levkina (INASAN), N. Pankov (HSE, IKI), A. Volnova
(IKI), Sh. Ehgamberdiev (UBAI) report on behalf of GRB IKI FuN:
We finished observations of the ZTF20acozryr/AT2020yxz (Coughlin et al.,
GCN 28841) with AZT-22 telescope of Maidanak observatory, AS-32
telescope of Abastumani observatory, and Zeiss-2000 telescope of Terskol
observatory. The optical transient (Coughlin et al., GCN 28841; Xu et
al., GCN 28846; Zhu et al., GCN 28854; Mao et al., GCN 28861; Belkin et
al., GCNs 28862, 28875, 28883, 28886; Mao et al., GCN 28863; Kumar et
al., GCN 28876; Paek et al., GCN 28880; Moskvitin et al., GCN 28926) at
redshift z = 1.105 (Xu et al., GCN 28847) associated with afterglow of
GRB 201103B (Ursi et al., GCN 28831; Svinkin et al., GCN 28844; Evans et
al., GCN 28858).
The photometry reported early in Volnova et al., GCN 28925 must
corrected the GCN 28886. We apologize for inconvenience and thank to
D.A. Kann who pointed out for typo in the GCN 28925.
We repeat corrected photometry of our CrAO/ZTSh optical observation on
2020-11-13 22:58:04 below. We also add photometry of positive detections
and meaningful upper limit. the photometry below is still preliminary.
The photometry is based on the same reference stars of USNO-B1.0 stars.
Date UT start t-T0 Filter Exp. OT Err. UL. Telescope
(mid, days) (s)
2020-11-12 20:20:48 9.12087 R 80*60 21.70 0.35 21.7 AS-32
2020-11-13 22:58:04 10.21897 R 24*120 22.45 0.14 23.6 ZTSh
2020-11-23 19:29:37 12.07213 R 14*180 22.80 0.13 24.1 AZT-22
2020-11-23 19:26:37 20.08671 R 30*180 n/d n/d 23.2 AZT-22
A full light curve and upper limits obtained in our observations
(R-filter) can be found in
http://grb.rssi.ru/GRB201103B/GRB201103B_LC_R.png
A typical power law light curve (index of ~1.12) can be suggested based
on our observations and photometry gathered from GCNs, see
http://grb.rssi.ru/GRB201103B/GRB201103B_LC_GCN.png
One can suggest overlay bumps (or plateau) on the light curve of at 2-3
days, and 5-9 days after burst trigger.
If we extrapolate the power law curve backward to the 200 seconds the
afterglow brightness could have ~12m. If so, one can look for data in
all sky cameras or wide field surveys to search early phase of the
afterglow of the GRB 201103B (trigger time (UT) 2020-11-03 18:06:45.36,
Ursi et al., GCN 28831).