TITLE:   GCN CIRCULAR
NUMBER:  40216
SUBJECT: SVOM/sb25042207: BOOTES-2 early optical upper limit
DATE:    25/04/23 07:34:37 GMT
FROM:    I. Perez-Garcia at Institute of Astrophysics of Andalusia <ipg@iaa.es>

M. Gritsevich (Univ. of Helsinki), I. Perez-Garcia, M.D. Caballero-Garcia, E. J. Fernandez-Garcia, R. Sanchez-Ramirez, S.-Y. Wu, S. Guziy, and A. J. Castro-Tirado (IAA-CSIC, Granada), Y.-D. Hu (GXU), C. Perez del Pulgar and A. Reina (Univ. of Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC), and M. Jelinek (ASU-CAS, Ondrejov Obs.), on behalf of a larger collaboration, report:

Following the detection of the X-ray transient sb25042207 by SVOM (Liang et al. GCNC [40213](https://gcn.nasa.gov/circulars/40213)), the 0.6m BOOTES-2/TELMA robotic telescope at IHSM UMA “La Mayora” (Malaga, Spain) automatically responded to this high-energy event starting on Apr 22, 23:38:10 UT (i.e. 2 min after alert). On a coadd (20) of images at 00:00:50 UT (mid exposure time; i.e. 24 min post detection), nothing is detected down to 18.1 mag (clear filter), in agreement with the deeper observations taken later on (Belkin et al., GCNC [40215](https://gcn.nasa.gov/circulars/40215)).

We would like to thank the staff at IHSM-/UMA-CSIC “La Mayora” for their excellent support.