TITLE:   GCN CIRCULAR
NUMBER:  38947
SUBJECT: GRB 250114B: OHP/T193 optical upper limit
DATE:    25/01/14 22:47:18 GMT
FROM:    Benjamin Schneider at MIT <bschn@mit.edu>

B. Schneider (LAM), C. Adami (LAM/Pytheas/AMU), S. Basa (LAM/OHP/Pytheas/AMU), E. Le Floc'h (CEA), A. Saccardi (CEA), D. Turpin (CEA) report on behalf of a larger collaboration:

We observed the field of the INTEGRAL GRB 250114B (Gotz et al., GCN 38938) with the T193cm telescope at the Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. We obtained a total of 61 minutes (1x300s + 4x180s + 11x240s) in the i-band using the red MISTRAL setting from 2025-01-14T18:08 to 2025-01-14T19:29 (mid-time 5.6h after the trigger).
In the stacked image, we do not detect any new source at the XRT #2 source position (Evans et al., GCN 38941) or within the INTEGRAL error circle (Gotz et. al., GCN 38938) down to the following 5-sigma limit:

i > 20.88 mag (AB)

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

We acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Balcaen, Orlagh Creevey and Flavien Kiefer.