GCN Circular 22865

Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),
William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J.
Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI),
Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz
(UCSC), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey
Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki
Toy (UMD) report:

We observed the field of GRB 180626A (Evans, et al., GCN Circ. 22850
Not found
 
 
)
with the Reionization and Transients Infrared Camera (RATIR;
www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio
Astron��mico Nacional on Sierra San Pedro M��rtir from 2018/06 27.16 to
2018/06 27.20 UTC (19.60 to 20.46 hours after the BAT trigger),
obtaining a total of 0.71 hours exposure in the r and i bands.

For a source at the position of the UVOT counterpart, in comparison with
the SDSS DR9 catalog, we obtain the following detections:

  r	= 22.39 +/- 0.20
  i	= 21.92 +/- 0.15

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.

The source flux has faded approximately as t^-0.35 since our previous
observations (Troja et al., GCN Circ. 22855
Not found
 
 
).

We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.