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GCN Circular 17613

Subject

GRB 150323A: RATIR Optical Afterglow Observations

Date

2015-03-23T04:09:49Z (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 150323A (Amaral-Rogers, et al., GCN 17611Not 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 2015/03 23.12 to 2015/03 23.16 UTC
(9.6 to 58.8 minutes after the BAT trigger), obtaining a total of 42.6
minutes exposure in the r, i, and z bands.

For the source on the edge of the Swift-XRT error circle (Cenko et al., GCN
17612Not found
 
 
), in comparison with the SDSS DR9, we obtain the following
measurements and upper-limit (3-sigma):

  r = 21.16 +/- 0.11
  i = 20.39 +/- 0.05
  z > 19.30

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  We note that this source appears
to be fading during our observation.

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