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GCN Circular 16991

Subject
GRB 141028A: Continued RATIR Observations
Date
2014-10-30T16:13:49Z (10 years ago)
From
Eleonora Troja at GSFC <eleonora.troja@nasa.gov>
Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM),
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), 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 141028A (Bissaldi, et al., GCN 16969Not 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 2014/10 30.08 to 2014/10 30.31 UTC (39.07
to 44.46 hours after the GBM trigger), obtaining a total of 4.24 hours
exposure in the r, i, and z bands.

For a source within the enhanced XRT error circle (Pagani et al., GCN 
16986Not found
 
 
),
in comparison with the SDSS DR9, we obtain the following detections:

   r    21.19 �� 0.04
   i    20.79 �� 0.03
   z    20.74 �� 0.24

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  A comparison to our previous
observations (Troja et al., GCN 16980Not found
 
 
) shows that the afterglow faded 
with a
power-law decay index of alpha ~ 0.9 in all three filters, consistent 
with the decay
reported by Cenko & Perley (GCN 16989Not found
 
 
).

Further observations are planned.

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