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GCN Circular 18312

Subject

GRB 150910A: Continued RATIR Observations

Date

2015-09-14T17:25:20Z (9 years ago)

Edited On

2024-11-07T19:33:43Z (2 months ago)

From

Nat Butler at UC berkeley <natxbutler@gmail.com>

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), 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 18264Loading...
 
 ) 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 14.17 to 2015/09 14.46 UTC (90.88 to 98.01 hours after the BAT trigger), obtaining a total of 1.71 hours exposure in the r, i, and z bands.

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

   r = 22.23 +/- 0.09
   i = 22.44 +/- 0.10
   z > 19.89 (3-sigma)

These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.  Compared to our previous night of observations (Butler et al., GCN 18302Loading...
 
 ), the source flux is consistent with remaining constant at the ~1-sigma level.  Also, the source appears to be extended in our images, suggesting that the flux may be dominated by the GRB host galaxy.

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