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GCN Circular 27272

Subject

GRB 200228B: RATIR Optical Observations

Date

2020-02-29T15:51:14Z (4 years ago)

From

Rosa Leticia Becerra Godinez at Inst. de Astronoma,UNAM <rbecerra@astro.unam.mx>

Rosa L. Becerra (UNAM), 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 200228B (Fermi GBM team, GCN 27253Not found
 
 
,
Laha, et. al. GCN 27254Not 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 2020/02
29.36
to 2020/02 29.53 UTC (21.40 to 25.38 hours after the BAT trigger), obtaining
a total of 2.27 hours exposure in the r and i bands.

For a source within the Swift-XRT enhanced error circle (Evans et al., GCN
Circ. 27256Not found
 
 
),
in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following
upper
limits (3-sigma):

  r > 23.19
  i > 23.11

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.