TITLE:   GCN CIRCULAR
NUMBER:  40911
SUBJECT: GRB 250702F: DDOTI Optical Observation
DATE:    25/07/03 10:35:15 GMT
FROM:    Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra@roma2.infn.it>

Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Sahil Atri (U Roma), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report:

We observed the field of GRB 250702F detected by Swift (Klingler et al., GCN Circ. 40894) and Fermi/GBM (Fermi GBM Team, GCN Circ. 40892) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on the night of 2025-07-03 UTC. 

DDOTI observed the Swift/UVOT position (Klingler et al., GCN Circ. 40894) from 04:12 UTC to 08:31 UTC (from T+7.1 h to T+ 11.4 h after the trigger), obtaining a total exposure of 2.4 hours, alternating with other scientific programs.

Comparing our observations to Pan-STARRS PS1 DR2 catalogues, we detect the optical counterpart reported by Klingler et al. (GCN Circ. 40894), Jelinek et al. (GCN Circ. 40895), Kumar et al. (GCN Circ. 40896), Lipunov et al. (GCN Circ. 40899), Martin-Carrillo et al. (GCN Circ. 40900), de Ugarte Postigo et al. (GCN Circ. 40901) and Angulo et al. (GCN Circ. 40907) with an AB magnitude of: 

w = 19.85 +/- 0.05
 
This value is not corrected for the Galactic extinction.

We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.