TITLE: GCN CIRCULAR NUMBER: 39853 SUBJECT: FRB 250316A: DDOTI Continued Optical Observations (Third Epoch) DATE: 25/03/23 15:37:35 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma rosa.becerra@roma2.infn.it
Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Eleonora Troja (U Roma), Margarita Pereyra (UNAM), Simone Dichiara (Penn State University), 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 2025-03-23 UTC.
DDOTI observed the field centred in the position of EP J120944.2+585060 RA = 182.4341 deg, Dec = 58.8499 deg (J2000) from 03:00 UTC to 12:18 UTC (from T+6.8 days to T+7.2 days after the discovery of FRB 250316A) with a total exposure of 240 minutes.
Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we detect no evident uncatalogued sources within the observed field to a 3-sigma limiting AB magnitude of
w > 22.4
This non-detection is consistent with those reported by Becerra et al. 2025 ATel 17082, Niuno et al. 2025, ATel 17084, Hashimoto ATel 17095, Aryan et al. 2025, Circ. GCN 39839, Yang et al. 2025, ATel 17101, and Becerra et al. GCN 39843.
We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.
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