GCN Circular 45584

Subject

GRB 260915A: REM optical/NIR observations

Event

GRB 260915A

Date

2026-09-15T12:24:58Z (3 days ago)

From

Riccardo Brivio at INAF-OAB <riccardo.brivio@inaf.it>

Via

Web form

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 45570Loading...
 
 ) 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.