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GCN Circular 18935

Subject

GRB 160121A: RATIR Optical Observations

Date

2016-01-25T18:37:38Z (9 years ago)

Edited On

2024-11-07T19:54:25Z (5 months ago)

From

Alan M. Watson at Instituto de Astronomia UNAM <alan@astro.unam.mx>

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>

Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),
William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J.
Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara
(GSFC/STScI), Eleonora Troja (GSFC), 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 160121A (Hagen et al., GCN Circular 18912Loading...
 
 )
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 2016/01 24.13 to
2016/01 24.42 UTC (61.29 to 68.12 hours after the BAT trigger),
obtaining a total of 4.27 hours exposure in the r, i and z bands.

We no longer detect the source previously reported by Watson et al.
(GCN Circular 18924Loading...
 
 ). In comparison with the USNO-B1 and 2MASS catalogs,
we obtain the following 3-sigma upper limits:

   r > 22.97
   i > 22.94
   z > 20.10

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.