GCN Circular 23661
Subject
GRB 190106A: optical observations, possible jet break detection
Date
2019-01-09T18:42:15Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), P. Minaev (IKI), E. Klunko (ISTP),
I. Reva (FAPI), M. Krugov (FAPI), V. Rumyantsev (CrAO), R. Ya.
Inasaridze (AbAO), E. Mazaeva (IKI), A. Volnova (IKI) report on
behalf of IKI-FuN:
We continue observations the optical afterglow (e.g. Lipunov et al.
GCN 23616, Itoh et al. GCN 23617, Mao et al. GCN 23618, Reva et al., GCN
23620, Xin et al. GCN 23622, Quadri et al. GCN 23624, Hu et al. GCN
23627) of the GRB 190106A (Sonbas et al., GCN 23615) with AZT-33IK
telescope of Sayan observatory (Mondy), Zeiss-1000 1-m telescope of Tien
Shan Astronomical Observatory, and AS-32 (0.7m) telescope of Abastumani
Observatory. Preliminary photometry of the afterglow is following.
Date UT start t-T0 Filter Exp. OT Err. Observatory
(mid, days) (s)
2019-01-07 17:27:12 1.19251 R 63*60 20.27 0.08 AbAO
2019-01-08 11:07:16 1.91774 R 30*120 21.11 0.13 Mondy
2019-01-08 15:53:23 2.09628 R 12*120 21.1 0.3 CrAO
The photometry is based on nearby SDSS stars
SDSS-DR12_id R(Lupton)
J015920.22+235150.7 16.475
J015929.35+235237.5 15.774
Based on our previous results (GCNs 23620, 23638, 23640) and photometry
above we plot a light curve (
http://grb.rssi.ru/GRB190106A/GRB190106A_LC_R_fit.png ). We could
suggest the jet break at 1.5 +/- 0.5 days.
