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GCN Circular 17595

Subject

GRB 150317A: RATIR Optical Afterglow Detection

Date

2015-03-17T14:41:50Z (10 years ago)

Edited On

2024-11-07T19:42:03Z (15 days ago)

From

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

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>

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), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús
González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and
Harvey Moseley (GSFC) report:

We observed the field of GRB 150317A (Siegel, et al., GCN 17592Not found
 
 
) with the
Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the
1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on
Sierra San Pedro Mártir from 2015/03 17.18 to 2015/03 17.43 UTC (3 minutes
to 5.9 hours after the BAT trigger), obtaining a total of 3 hours exposure
in the r, i, and z bands.

We find an uncatalogued source within the Swift-XRT error circle (Evans et
al., GCN 17594Not found
 
 
).  In comparison with the SDSS DR9 and 2MASS, we obtain the
following detections and upper limit (3-sigma):

  r     20.5 +/- 0.1
  i     21.7 +/- 0.1
  z     > 20.8

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.  This photometry is preliminary and
can be expected to improve with a more detailed analysis due to the
proximity of a bright star (e.g., Xu, et al., GCN 17593Not found
 
 
).

We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.