FRB 250316A: DDOTI Upper Limit on the Optical Counterpart
ATel #17082; Rosa L. Becerra (U Roma), Simone Dichiara (Penn State University), Eleonora Troja (U Roma), Sahil Atri (U Roma), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Ocelotl Lopez (UNAM) and Margarita Pereyra (UNAM)
on 17 Mar 2025; 21:28 UT
Credential Certification: Margarita Pereyra (mpereyra@astro.unam.mx)
Subjects: Optical, Fast Radio Burst
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 Astronomico Nacional on the Sierra of San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2025-03-17 UTC.
DDOTI observed the field centred in R.A. = 12:09:54.31, Dec. = 58:50:57.84 from 02:58 UTC to 06:52 UTC (from T+18.4 to T+24.01 hours after the event) with a total exposure of 1.53 hours down to a 5-sigma limiting AB magnitude of w = 21.0.
Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we
detect no evident uncatalogued sources within the observed field to our 5-sigma limit.
By performing image subtraction using PanSTARRS reference templates, we identify a bright source at RA, Dec (J2000)=02:09:58.11, +58:52:33.60, consistent with a High Proper Motion Star in the Gaia DR3 Catalog (Gaia Collaboration, 2023).
We thank the staff of the Observatorio Astronomico Nacional on the Sierra of San Pedro Martir.
