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GCN Circular 16980

GRB 141028A: RATIR Optical and NIR Observations
2014-10-29T04:12:02Z (10 years ago)
Eleonora Troja at GSFC <>
Eleonora Troja (GSFC), Antonino Cucchiara (ORAU/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), Owen 
Littlejohns (ASU),
Enrico Ramirez-Ruiz (UCSC), Jos� A. de Diego (UNAM), Leonid Georgiev 
Jes�s Gonz�lez (UNAM), Carlos Rom�n-Z��iga (UNAM), Neil Gehrels (GSFC),
and Harvey Moseley (GSFC) report:

We observed the field of the Fermi/LAT GRB 141028A (Bissaldi et al., GCN 
16969, Roberts et al.
GCN 16971) 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 2014/10 29.08 to 2014/10 29.13 UTC  (from 13.62 to 14.82 
hours after the
Fermi-GBM trigger),  obtaining a total of 1.07 hours exposure in the r, 
i and z bands.

At the position of the XRT and optical counterparts (Kennea et al., GCN 
16978, Gorbovskoy
et al. GCN 16972,  Graham et al. GCN 16977), in comparison with the SDSS 
DR9, we
obtain the following detections:

   r 20.09 +/- 0.02
   i 19.85 +/- 0.02
   z 19.50 +/- 0.10

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 Astron�mico Nacional in San Pedro

[GCN OPS NOTE(29oct14)" Per author's request, the Subject-line was
corrected from "29A" to "28A".]
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