TITLE:   GCN CIRCULAR
NUMBER:  45584
SUBJECT: GRB 260915A: REM optical/NIR observations
DATE:    26/09/15 12:24:58 GMT
FROM:    Riccardo Brivio at INAF-OAB <riccardo.brivio@inaf.it>

R. Brivio, M. Ferro, F. Guidolin, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team:

We observed the field of GRB 260915A, detected by SVOM/ECLAIRs (Liang et al., GCN 45570) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile).                 
The observations were carried out in the g, r, i, z, J, and H bands, started on 2026-09-15 at 01:14:32 UT (i.e. 2.5 min after the burst) and lasted for about 2.5 hr.

From preliminary photometry, we do not detect any optical/NIR uncatalogued source down to the following 3sigma limits:

r > 18.3 (AB; calibrated against the Pan-STARRS catalogue),
 at a mid-time of 7.5 min after the trigger;

H > 14.5 (Vega; calibrated against the 2MASS catalogue),
 at a mid-time of 3.0 min after the trigger.