[vsnet-grb-info 18545] GRB 161004A: RATIR Optical and NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19993
SUBJECT: GRB 161004A: RATIR Optical and NIR Observations
DATE:    16/10/05 12:32:05 GMT
FROM:    Eleonora Troja at GSFC  <eleonora.troja at 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), 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 161004A (Evans, et al., GCN 19979) 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 5.10 to 2016/10 5.22 
UTC (13.49 to 16.23 hours after the BAT trigger), obtaining a total 
of 1.73 hours exposure in the r and i bands and 0.65 hours exposure in 
the Z, Y, J, and H bands.

For a source within the Swift-UVOT error circle (Breeveld & Evans, 
GCN 19984), in comparison with the USNO-B1 and 2MASS catalogs, we 
obtain the following upper limits (3-sigma):

  r > 23.3
  i > 23.2
  Z > 22.4
  Y > 21.8
  J > 21.3
  H > 19.4

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.