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GCN Circular 20149

Subject
GRB 161108A: RATIR Afterglow Confirmation
Date
2016-11-08T14:29:23Z (8 years ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
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), 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 161108A (Beardmore, et al., GCN 20145Not 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 2016/11 8.48 to 2016/11 8.54 UTC (7.87 to
9.34 hours after the BAT trigger), obtaining a total of 1.03 hours exposure
in the r and i bands and 0.40 hours exposure in the Z, Y, J, and H bands.

The afterglow candidate reported by Malesani et al. (GCN 20146Not found
 
 
) is well
detected.  In comparison with the SDSS DR9 and 2MASS catalogs, we obtain
the following detections and upper limits (3-sigma):

  r = 21.97 +/- 0.12
  i = 21.36 +/- 0.06
  Z = 20.88 +/- 0.11
  Y = 20.57 +/- 0.14
  J = 20.05 +/- 0.27
  H > 18.12

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  The source appears to have faded
in r by about 1 magnitude as compared to Malesani et al. (GCN 20146Not found
 
 
).

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