GCN Circular 46223
Subject
GRB 261110A: SVOM/COLIBRÍ (FM-GFT) optical observations
Event
Date
2026-11-11T07:53:50Z (14 hours ago)
From
Massimiliano Lincetto at Aix Marseille Univ, CNRS/IN2P3, CPPM <lincetto@cppm.in2p3.fr>
Via
Web form
Camila Angulo (UNAM), Massimiliano Lincetto (CPPM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García-García (UNAM), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Asuka Kuwata (UNAM), Marion Guelfand (CPPM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM), Antonio de Ugarte Postigo (LAM), Alan M. Watson (UNAM), Wen-Jun Tan (PKU) and J. X. Cao (GXU) report:
We imaged the field of the SVOM GRB 261110A (Wang et al., GCN Circ. 46215) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2026-11-11 02:23:36 to 04:42:13 UTC (from 14.57 to 16.88 hours after the trigger) and obtained 138.6 minutes of exposure in the r filter.
The data were reduced and coadded with the CPPM COLIBRÍ pipeline. The photometry was calibrated using nearby stars from the PanSTARRS DR2 catalog, is in the AB system, and is not corrected for Galactic extinction.
After subtracting the template Legacy Survey image, we detected the optical counterpart reported by Wu et al. (GCN Circ 46218), Li et al (GCN Circ. 46219) and Moskvitin et al. (GCN Circ. 46220) at a preliminary magnitude of:
r = 23.60 +/- 0.19
Further observations are ongoing.
We thank the staff of the Observatorio Astronómico Nacional at Sierra de San Pedro Mártir, as well as the technical and engineering teams at CEA, CPPM, IRAP, LAM, OHP, OSU Pytheas, and UNAM.
COLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico.