TITLE:   GCN CIRCULAR
NUMBER:  20234
SUBJECT: GRB 161202A: RATIR Optical and NIR Observations
DATE:    16/12/04 17:03:08 GMT
FROM:    Eleonora Troja at GSFC  <eleonora.troja@nasa.gov>

Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM),
Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer
(UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB),
Antonino Cucchiara (UVI), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz
(UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González
(UNAM), Carlos Román-Zúñiga (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 161202A (Sbarufatti, et al., GCN 20227;
Vianello & Longo, GCN 20229) with the Reionization and Transients
Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson
Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro
Mártir from 2016/12 4.08 to 2016/12 4.31 UTC (26.70 to 32.11 hours after
the BAT trigger), obtaining a total of 3.34 hours exposure in the r and i
bands and 1.45 hours exposure in the Z, Y, J, and H bands.

For a source within the Swift-XRT error circle (Burrows, et al., GCN 20231)
in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following
upper limits (3-sigma):

   r    > 24.0
   i    > 23.9
   Z    > 23.1
   Y    > 22.8
   J    > 22.4
   H    > 22.0

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 Astronómico Nacional in San Pedro
Mártir.