GCN Circular 18744

M. Soares-Santos (Fermilab), A. Rest (STSCI), D. James (CTIO/NOAO), D. J.
Brout (UPenn), J. Annis (Fermilab), E. Berger (Harvard), H.-Y. Chen
(UChicago), P. Cowperthwaite (Harvard), H. T. Diehl (Fermilab), B. Farr
(UChicago), D. A. Finley (Fermilab), J. Frieman (Fermilab/UChicago),  R.
Gruendl (NCSA), D. Holz (UChicago), R. Kessler (UChicago), K. Herner
(Fermilab), E. Neilsen (Fermilab), M. Sako (UPenn), B. Yanny (Fermilab)

On behalf of the DESGW team:

We report on observations done with the Dark Energy camera (DECam) on the
Blanco 4-m telescope at CTIO on the night of 2015-12-27 in response to the
LVC trigger G211117/G211182. These observations are part of a plan to
observe about 90 sq-deg of the region of interest (the subregion that is
visible from CTIO) and cover a total of about 10% of the total LVC
probability.

DECam has a 3 sq-deg field of view, and typically reaches i,z = 23rd
limiting
magnitudes for 90 sec exposure times. If an optical counterpart of
magnitude ~23 or brighter, is present within the imaged area, our observing
strategy allows us to achieve ~90% detection probability.

Coordinates observed in the first night are given below. More observations
are planned for upcoming nights. Analysis is underway.

ra      dec
29.932371       2.0517
25.168446       -3.0207
26.75595        -2.0063
37.708542       13.20445
34.568587       9.14855
23.617796       -6.0642

-- 
Marcelle Soares-Santos
http://home.fnal.gov/~marcelle/
http://www.darkenergysurvey.org/ <http://darkenergysurvey.org/>