TITLE: GCN CIRCULAR NUMBER: 39860 SUBJECT: EP250324A: COLIBRÍ/DDRAGO Optical Observations DATE: 25/03/24 11:57:56 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma rosa.becerra@roma2.infn.it
Jean-Grégoire Ducoin (CPPM), Rosa L. Becerra (U Roma), Benjamin Schneider (LAM), Antonio de Ugarte Postigo (LAM), Margarita Pereyra (UNAM), Stéphane Basa (LAM), William H. Lee (UNAM), Dalya Akl (AUS), Camila Angulo (UNAM), Sarah Antier (OCA), Jean-Luc Atteia (IRAP), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (IRAP), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Kin Ocelotl López (UNAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM) and Ny Avo Rakotondrainibe (LAM) report:
We observed the field of EP250324A (ID=01709133021) with the DDRAGO wide-field imager on the COLIBRÍ telescope at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico. We observed from 2025-03-24 10:12 to 10:27 UTC (0.6 to 0.8 hours after the trigger). The data were coadded with the COLIBRÍ pipeline and analysed with STDWeb/STDPipe (Karpov 2021), with photometric calibration against Pan-STARRS DR1. Our photometry is in the AB system and is not corrected for Galactic extinction.
Within the EP/WXT localization, we do not detect any uncatalogued sources to a 5-sigma limiting magnitude of :
i > 22.20
Further analysis of the additional images is ongoing.
We warmly thank the COLIBRÍ and DDRAGO engineering teams and the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir.
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