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GCN Circular 17116

Subject
GRB 141121A: Continued RATIR Optical Observations
Date
2014-11-29T16:15:21Z (9 years ago)
From
Alan M. Watson at Instituto de Astronomia UNAM <alan@astro.unam.mx>
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H.
Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J.
Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC),
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), and Harvey Moseley (GSFC) report:

We observed the field of GRB 141121A (Lien et al., GCN 17075) 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 2014/11 29.29 to 2014/11 29.53 UTC (195.13 to 200.87 hours
after the BAT trigger), obtaining a total of 4.62 hours exposure in the r, i and
z bands.

For a source within the Swift-XRT error circle, in comparison with the SDSS DR9,
we obtain the following detections and upper limits (3-sigma):

  r = 22.15 +/- 0.06
  i = 21.97 +/- 0.06
  z > 21.04

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.

The afterglow continues to fade with a steepening temporal index.

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