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GCN Circular 22719

Subject
GRB 180512A: RATIR Optical Observations
Date
2018-05-13T16:00:35Z (6 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), 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 180512A (Deich et al., GCN Circ. 22710)
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 2018/05 13.16 to
2018/05 13.44 UTC (5.75 to 12.58 hours after the BAT trigger), obtaining
a total of 5.22 hours exposure in the r and i bands.

For a source within the enhanced Swift-XRT error circle (Evans et al.,
GCN Circ. 22715), in comparison with the SDSS DR9 and 2MASS catalogs, we
obtain the following 3-sigma upper limits:

 r	> 24.30
 i	> 24.23

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
M��rtir.
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