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GCN Circular 33178

GRB 230116D: Sintez-Newton/CrAO optical afterglow detection
2023-01-16T22:42:57Z (a year ago)
Alexei Pozanenko at IKI, Moscow <>
S. Nazarov (CrAO), A. Pozanenko (IKI),  S. Belkin (IKI, HSE),  N. Pankov 
(HSE)  report on behalf of IKI GRB FuN:

We observed GRB 230116D (Sonbas et al., GCN 33176)  with Sintez-Newton 
telescope of CrAO observatory.  Observation started on 2023-01-16 (UT) 
21:21:41. The series consists of images with an exposure of 120 s in 
Clear filter.

In the first images we detect an object in coordinates (J2000)
06:34:28.01 +49:52:20.35 (with uncertainties of 0.5 arcsec) which is 
within of the XRT error circle (Sonbas et al., GCN 33176).
Preliminary photometry of the afterglow is 19.5 at (UT) 21:41:56. The 
photometry is based on nearby USNO-B1.0 (R2) stars. There is no object 
in PS1 and DSS2 catalogues at this coordinates. Therefore we suggest the 
object is the afterglow of GRB 230116D. Observation is continuing.
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