[vsnet-grb-info 17021] GRB 150910A: RATIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18302
SUBJECT: GRB 150910A: RATIR Observations
DATE:    15/09/13 16:22:24 GMT
FROM:    Nat Butler at UC berkeley  <natxbutler at gmail.com>

Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), 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), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of GRB 150910A (Pagani et al., GCN 18264) 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 2015/09 13.15 to 2015/09 13.26 UTC (66.44 to 69.21 hours after the BAT trigger), obtaining a total of 0.99 hours exposure in the r, i, and z bands.

The optical afterglow (Pagani et al.; Zheng and Filippenko, GCN 18265) is well detected.  In comparison with the SDSS DR9 catalog, we obtain:

   r 22.44 +/- 0.13
   i 22.31 +/- 0.11
   z > 20.29 (3-sigma)

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 Astronómico Nacional in San Pedro Mártir.