TITLE:   GCN CIRCULAR
NUMBER:  29940
SUBJECT: DDOTI Observations of ZTF21aayokph (AT2021lfa) 
DATE:    21/05/05 04:29:06 GMT
FROM:    Alan M Watson at UNAM  <alan@astro.unam.mx>

Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Simone Dichiara
(GSFC/UMD), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl Lopez
(UNAM), Diego Gonzalez (UNAM), Margarita Pereyra (UNAM), Srihari Ravi (ASU), and
Eleonora Troja (GSFC/UMD) report:

We observed ZTF21aayokph (AT2021lfa) (Yao, Perley, & Ho, GCN Circ. 29938) with
the DDOTI wide-field imager at the Observatorio Astronómico Nacional on Sierra
San Pedro Martir (http://ddoti.astroscu.unam.mx) from 2021-05-05 03:18 to 04:10
UTC and obtained 2700 seconds of exposure in the w filter.

We observed a region covering aproximately 7 degrees in RA and 10 degrees in
declination (about 70 square degrees). We calibrated our images against the
APASS catalog.

We detect a source reported by Yao, Perley, & Ho (GCN Circ. 29938) with an AB
magnitude of w = 20.51 +/- 0.10.

Observations are continuing.

We thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.