TITLE:   GCN CIRCULAR
NUMBER:  33190
SUBJECT: GRB 230116D: KGO RC-25 optical observations
DATE:    23/01/17 20:01:46 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI, HSE),  A. V. Samokhvalov (citizen scientist, Surgut), 
A. Pozanenko (IKI),  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., GCN 33189) of GRB 230116D (Sonbas et al., GCN 
33176) with 25cm 1/8 Ritchey-Chretien  telescope of KGO observatory. 
Observation started on 2023-01-16 (UT) 21:21:41. The series consist of 
images with an exposure of 600 s in R-filter. Preliminary photometry of 
the stacked image is following

Date UT-start       Exptime Filter t-T0     OT     Err    UL
2023-01-16 23:36:12 11*600  R      0.16075  20.25  0.20   20.4

Ref.stars
USNO-B1.0
RA DEC R2

06:34:04.9708800 +49:53:05.863200 15.61
06:34:38.7820800 +49:49:22.972800 16.29
06:34:57.9967200 +49:53:01.932000 16.94
06:34:24.5268000 +49:47:49.801200 15.68