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GCN Circular 17383

Subject

GRB 150203A: RATIR Optical and NIR Observations

Date

2015-02-03T06:42:32Z (9 years ago)

From

Nat Butler at Az State U <natbutler@asu.edu>

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), 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 150203A (Ukwatta, et al., GCN 17377Not 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 2015/02 3.19 to 2015/02 3.26 UTC (0.50 to 2.14
hours after the BAT trigger), obtaining a total of 1.28 hours exposure in
the r, i, and z bands.

We find no uncatalogued sources within the Swift-XRT error circle (Evans,
et al., GCN 17378Not found
 
 
).  In comparison with USNO-B1 and 2MASS, we obtain the
following upper limits (3-sigma):

  r > 23.1
  i > 23.3
  z > 20.1

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.