GCN Circular 33191
Subject
GRB 230116D: SAO RAS photometry
Date
2023-01-17T21:39:47Z (a year ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI, HSE), A. Moskvitin (SAO RAS), A. Pozanenko (IKI), A.
Moiseev (SAO RAS), D. Oparin (SAO RAS), N. Pankov (HSE, IKI) report on
behalf of GRB IKI FuN:
We observed the optical afterglow (Zhu et al., GCN 33177; Nazarov et
al., GCN 33178; Moskvitin et al. GCNs 33179, 33187; Swain et al., GCN
33182; Belkin et al., GCNs 33189, 33190) of GRB 230116D (Sonbas et al.,
GCN 33176) with BTA SAO RAS telescope equipped with SCORPIO-2.
Observation started on 2023-01-16 (UT) 23:31:38. Photometric
observations consists of r -filter acquisition imaging and g,r,i -
filters after before spectroscopy (Moskvitin et al. GCN 33187).
Preliminary photometry of stacked images is following
Date UT-start Exptime Filter t-T0 OT Err UL
2023-01-16 23:31:48 2*20 r 0.10951 20.29 0.05 21.4
2023-01-17 01:33:17 2*90 r 0.18859 20.97 0.04 23.2
2023-01-17 01:30:43 3*120 g 0.18935 22.18 0.08 23.1
Ref.stars
PanSTARRS-PS1
RA DEC g r i z
06:34:21.9567816 +49:52:11.318772 16.3946 15.7833 15.5155 15.3912
06:34:23.9012808 +49:51:55.541160 18.8105 18.2189 17.9721 17.8591
06:34:37.7805360 +49:50:45.780468 18.3294 17.6554 17.3783 17.2518
The light curve based on afterglow observations (GCNs 33177, 33178,
33179, 33187, 33188, 33182, 33189, 33190) can be found at
http://grb.rssi.ru/GRB230116D/GRB230116D_lc_1.png
The light curve confirms rebrightening (Moskvitin et al. GCN 33179) or
plateau at 0.03 - 0.1 days and correlate with XRT LC
(https://www.swift.ac.uk/xrt_curves/01149293/).
