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GCN Circular 32935

Subject
GRB 221110A: COATLI Second-Epoch Upper Limits
Date
2022-11-11T21:03:17Z (2 years ago)
From
Alan M Watson at UNAM <alan@astro.unam.mx>
Alan M. Watson (UNAM), Nat Butler (ASU), Rosa Becerra (UNAM), Simone
Dichiara (PSU), Tzveti Dimitrova (ASU), Oc��lotl L��pez (UNAM), Diego
Gonz��lez (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Margarita
Pereyra (UNAM), and Eleonora Troja (UTV/ASU) report:

We observed the field of the GRB 221110A (Williams et al., GCN Circ. 32925)
with the COATLI 50-cm telescope and HUITZI f/8 imager at the Observatorio
Astron��mico Nacional on the Sierra de San Pedro M��rtir (
http://coatli.astroscu.unam.mx) from 2022-11-11 03:28 UTC to 09:01 UTC
(25.0 to 30.6 hours after the trigger), obtaining a total of 270 minutes of
exposure in the r filter.

The source detected in our earlier observations (Pereyra et al., GCN Circ.
32927 has now faded and is not detected to a 3-sigma limit of

r > 22.6

Our photometry is calibrated against the Pan-STARRS1 catalog, is on an
approximate AB system, and is not corrected for Galactic extinction in the
direction of the GRB.

We thank the COATLI/HUITZI technical team and the staff of the Observatorio
Astron��mico Nacional.
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