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GCN Circular 11108

Subject
GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
Date
2010-08-16T15:59:01Z (14 years ago)
From
Myungshin Im at Seoul Nat U <mim@astro.snu.ac.kr>
Myungshin Im, Won-Kee Park (CEOU/Seoul National Univ),
  Soojong Pak, Hyeonju Jeong, Eunbin Kim, and Jinyoung Kim
  (Kyunghee University)

   We observed GRB 100816A (Palmer et al. GCN 11102Not found
 
 
) with the SDSS
  r,i,z-filters during the commissioning run of CQUEAN (the Camera for
  QUasars in the Early uNiverse)on the 2.1m telescope at the McDonald
  observatory. The observation started at 2010 August 16, 08:33:46 UT,
  about 8 hours after the BAT trigger. A series of 300 secs exposures
  were taken.

   We identify an object within the error circles reported by UVOT
  (Palmer et al. GCN 11102Not found
 
 
), and by Antonelli et al. (GCN 11104Not found
 
 
) which
  faded significantly, confirming its GRB afterglow nature.
   We also notice another extended object, about 1.3" to the South
  of the afterglow at RA=23:26:57.53 and Dec= +26:34:41.6 with ~0.4"
  error in position.
   The close proximity of the object to the afterglow suggests that
  this second object is possibly a host galaxy of GRB 100816A,
  although a chance projection cannot be ruled out.

         GRB      host    GRB+host     mid-point (UT)
   r      (unresolved)      21.4       08:39:36
   i     21.31    20.58      -         08:45:08

   The magnitudes are in AB, and the error of the photometry is
  about 0.1 mag. The photometry calibration is done with a standard
  star observation.
   The finding charts are available at
   http://astro.snu.ac.kr/~mim/grb/grb100816A/grb100816A_small.jpg
   http://astro.snu.ac.kr/~mim/grb/grb100816A/grb100816A_large.jpg
   N is up, and E is left. Further analysis of the data is
   ongoing.

   We thank the staffs of the McDonald observatory, David Doss,
  Peter S. Odoms, and John Kuehne for their assistance of
  the CQUEAN commissioning run.