TITLE:   GCN CIRCULAR
NUMBER:  20444
SUBJECT: GRB 170112A: RATIR Optical and NIR Observations
DATE:    17/01/12 23:48:48 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),
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 the short GRB 170112A (Mingo, et al., GCN 20436)
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 2017/01 12.15 to 2017/01 12.21 UTC (1.58 to
2.95 hours after the BAT trigger), obtaining a total of 0.76 hours
exposure in the r and i bands and 0.32 hours exposure in the Z and Y bands.

Comparison to the DSS reveals no obvious new source brighter than about
magnitude 19. However our data are deeper and we cannot yet exclude a 
fainter
counterpart.

Further observations to check for variability are planned.

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