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GCN Circular 22182

GRB 171205A: RATIR Optical and NIR Observations
2017-12-05T15:10:17Z (7 years ago)
Nat Butler at Az State U <>
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), Jes��s
Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey Moseley (GSFC), John
Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:

We observed the field of GRB 171205A (D'Elia, et al., GCN 22177) with the
Reionization and Transients Infrared Camera (RATIR; on the
1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on
Sierra San Pedro M��rtir from 2017/12 5.40 to 2017/12 5.53 UTC (2.15 to 5.36
hours after the BAT trigger), obtaining a total of 1.44 hours exposure in
the r and i bands and 0.71 hours exposure in the Z and Y bands.

In comparison with the USNO-B1 and 2MASS catalogs, we detect and obtain the
following photometry for the source reported by Izzo et al. (GCN 22180):

 r = 18.30 +/- 0.05
 i = 18.13 +/- 0.02
 Z = 18.35 +/- 0.05
 Y = 18.13 +/- 0.05

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
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