TITLE: GCN CIRCULAR NUMBER: 39843 SUBJECT: FRB 250316A: DDOTI Continued Optical Observations DATE: 25/03/23 02:08:14 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma rosa.becerra@roma2.infn.it
Rosa L. Becerra (U Roma), Eleonora Troja (U Roma), Margarita Pereyra (UNAM), Simone Dichiara (Penn State University), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Sahil Atri (U Roma), Nat Butler (ASU), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), and Océlotl López (UNAM) report:
We observed the field of FRB 250316A (ID=439373176) detected by CHIME/FRB (Mason, ATel #17081) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on the Sierra of San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2025-03-22 UTC.
DDOTI observed the field centred in the position of EP J120944.2+585060 RA = 182.4341 deg, Dec = 58.8499 deg (J2000) from 12:05 UTC to 12:29 UTC with a total exposure of 24 minutes down to a 3-sigma limiting AB magnitude of w = 21.3 consistent with previous reports by Becerra et al. 2025 ATel 17082, Niuno et al. 2025, ATel 17084, Hashimoto ATel 17095, Aryan et al. 2025, Circ. GCN 39839 and Yang et al. 2025, ATel 17101.
Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we detect no evident uncatalogued sources within the observed field to our 3-sigma limit.
We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.
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