{
  "bibcode": "2015GCN.18350....1S",
  "body": "M. Soares-Santos (Fermilab), J. Annis (Fermilab), E. Berger (Harvard),\nD. J. Brout (UPenn), H.-Y. Chen (UChicago), P. Cowperthwaite (Harvard),\nH. T. Diehl (Fermilab), B. Farr (UChicago), D. A. Finley (Fermilab), J.\nFrieman (Fermilab/UChicago), M. Garcia (CIEMAT/Madrid), R. Gruendl\n(NCSA), D. Hollowood (UCSC), D. Holz (UChicago), R. Kessler (UChicago),\nA. Kim (LBNL), K. Herner (Fermilab), E. Neilsen (Fermilab), M. Sako\n(UPenn), B. Yanny (Fermilab)\nOn behalf of the DESGW team:\n\nWe report on observations done with the Dark Energy camera (DECam) on\nthe Blanco telescope at CTIO on the night of 2015-09-18 in response to\nthe LVC trigger G184098. These observations complement those taken on\n2015-09-17, increasing the area coverage by about 20%.�� Our\nobservations were delayed by 1 night due to the mag 8.1 earthquake near\nCTIO.\n\nDECam has a 3 sq-deg field of view, and typically reaches i,z = 23rd\nlimiting magnitudes for 90 sec exposure times. In 2015-09-18 and\n2015-09-17, we covered a total of 6% of the LIGO probability map in 3\nhours of observing time. We imaged a total of 93 sq-deg to 23.25\n5-sigma point source limiting magnitude in i,z bands.��\nCoordinates for both nights are given below.\nAnalysis is underway.\n\n6 pointings in 2015-09-18\n    ra        dec\n62.107867  -57.8027\n120.622213 -67.14873\n129.784212 -68.71983\n132.961775 -65.42426\n133.801654 -67.3675\n77.530833  -66.03508\n\n28 pointings in 2015-09-17\n    ra        dec\n105.241671 -69.46246\n72.711983  -65.40533\n99.430667  -69.84\n68.298046  -63.8895\n95.986417  -68.35239\n110.757033 -68.87642\n115.898475 -68.09865\n109.488283 -70.73343\n103.3931   -71.25164\n115.164875 -70.00358\n120.35765  -69.0844\n65.041267  -62.8751\n93.434754  -69.99717\n65.802783  -60.8461\n62.9234    -59.8316\n125.044417 -67.99968\n129.235458 -66.77258\n68.870837  -61.8606\n125.215963 -69.94243\n72.150367  -62.8751\n62.107867  -57.8027\n87.38715   -69.92876\n83.908596  -71.39367\n81.427092  -69.63706\n84.793617  -68.22478\n82.565254  -66.48404\n79.328883  -67.84927\n77.530833  -66.03508\n\n[GCN OPS NOTE(20sep15): This Circular was originally published on 19:51 20-Sep-2015 UT.]",
  "circularId": 18350,
  "createdOn": 1442785294000,
  "email": "marcelle.soares.santos@gmail.com",
  "subject": "LIGO/Virgo G184098: DESGW followup program",
  "submitter": "M. Soares-Santos at Fermi Lab  <marcelle.soares.santos@gmail.com>",
  "eventId": "LIGO/Virgo G184098"
}