TITLE:   GCN CIRCULAR
NUMBER:  20098
SUBJECT: GRB 161022A: RATIR Optical and NIR Observations
DATE:    16/10/22 17:26:16 GMT
FROM:    Alan M. Watson at Instituto de Astronomia UNAM  <alan@astro.unam.mx>

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), Jos�� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes��s Gonz��lez
(UNAM), Carlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley
(GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD)
report:

We observed the field of GRB 161022A (Stamatikos et al., GCN Circ.
20087) 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 2016/10 22.37 to
2016/10 22.53 UTC (6.23 to 9.89 hours after the BAT trigger), obtaining
a total of 2.49 hours exposure in the r and i bands and 1.04 hours
exposure in the Z, Y, J, and H bands.

For a source within the Swift-XRT error circle (D'Elia et al., GCN Circ.
20092), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain
the following 3-sigma upper limits:

  r	> 24.24
  i	> 24.04
  Z	> 22.96
  Y	> 22.50
  J	> 22.18
  H	> 21.87

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

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