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GCN Circular 33282

Subject
GRB 230205A: OHP/T193 optical observations
Date
2023-02-06T11:57:33Z (a year ago)
From
Damien Turpin at NAOC (CAS) <dturpin-astro@hotmail.com>
D. Turpin (CEA Paris-Saclay), C. Adami (LAM), E. Le Floc'h,
D. Gotz, C. Plasse (CEA Paris-Saclay), B. Schneider (MIT),
�S. D. Vergani, A. Saccardi (GEPI, Observatoire de Paris), 
S. Basa, M. Ferrari, A. Le Van Suu (LAM) report 
on behalf of a larger collaboration:

We observed the field of the possible short GRB 230205A (Ambrosi et al.,
GCN 33271; Page et al., GCN 33277, Sakamoto et al., GCN 33280) using the 
T193cm telescope equipped with MISTRAL at Observatoire de Haute-Provence 
(France). 
Six exposures were obtained in the R-band (5x20s + 1x60s + 1x120s +
2x180s) under poor weather conditions from 2023 06 Feb. 03:37:06 UT to
2023 06 Feb 04:07:34 UT. 
In the combined last two frames (mid time ~17.57h after trigger), 
we do not detect the source and obtain the following upper limit:

R > 20.95 mag (AB)

The photometric calibration was performed using nearby stars from 
the PanSTARRS catalog.

No further observations using the MISTRAL instrument mounted on the 
T193-OHP are planned.

We acknowledge the excellent support from Observatoire de Haute Provence, 
in particular Stephane Favard, Jerome Schmitt.
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