TITLE: GCN CIRCULAR NUMBER: 38442 SUBJECT: GRB 241204A: DDOTI Upper Limits on the Afterglow DATE: 24/12/05 11:40:03 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra@roma2.infn.it> Rosa L. Becerra (Tor Vergata, Roma), Alan M. Watson (UNAM), Eleonora Troja (Tor Vergata, 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), and Margarita Pereyra (UNAM) report: We observed the field of the GRB 241204A detected by Fermi/LAT (Bissaldi et al., GCN [38436](https://gcn.nasa.gov/circulars/38436)) and Fermi/GBM (Godwin et al., GCN 38441) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on 2024-12-05 from 02:29 to 03:54 UTC (22.83 to 24.25 hrs after the event), obtaining a total of 48 minutes of exposure in the w filter down to a 10-sigma limiting magnitude of w = 20.6. Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we detect no uncatalogued sources within the observed field to our 10-sigma limit within the error radius reported by Fermi/LAT (Bissaldi et al., GCN 38436). We thank the DDOTI technical team and the staff of the Observatorio Astronómico Nacional. View this GCN Circular online at https://gcn.nasa.gov/circulars/38442. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...