GCN Circular 29998
Subject
GRB 210511B: DDOTI Upper Limits on the Afterglow
Date
2021-05-12T00:14:52Z (4 years ago)
From
Kin O. C. L. Mendoza at Instituto de Astronoma, UNAM <koclopez@astro.unam.mx>
Oc��lotl Lopez (UNAM), Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L.
Becerra (UNAM), Simone Dichiara (GSFC/UMD), Alexander Kutyrev (GSFC/UMD),
William H. Lee (UNAM), Diego Gonzalez (UNAM), Margarita Pereyra (UNAM),
Srihari Ravi (ASU), and
Eleonora Troja (GSFC/UMD) report:
We observed the field of the Fermi - GBM event GRB 210511B (Fermi
Collaboration, GCN Circ. 29988) with the DDOTI wide-field imager at the
Observatorio Astron��mico Nacional on Sierra San Pedro Martir (
http://ddoti.astroscu.unam.mx) from 2021-05-11 11:49:26 to 12:01:38 UTC
(0.38 to 0.58 hours after the trigger) and obtained 6 minutes of exposure
in the w filter. The images were obtained after the astronomical twilight.
We observed a region covering approximately 14 degrees in RA and 10 degrees
in declination, with a 2 x 1 grid, including the entire initial uncertainty
region distributed in the GCN Notice (Fermi Collaboration, GCN Circ. 29988)
Comparing to the Pan-STARRS DR1 catalog, we detect no uncatalogued point
sources to a 10-sigma limiting magnitude of w = 18.39.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
Martir.