{
  "bibcode": "2017GCN.21789....1A",
  "body": "S. Allam (Fermilab), J. Annis (Fermilab), J.Garcia Bellido (IFT CSIC/UAM),\nE. Berger (Harvard),\nD. J. Brout (UPenn), D. Brown (Syracuse), R. E. Butler (Fermilab), H.-Y.\nChen (Harvard), R. Chornock (Ohio University), E. Cook (TAMU), P. S.\nCowperthwaite (Harvard), H. T. Diehl (Fermilab), A. Drlica-Wagner\n(Fermilab), Z. Doctor (U. Chicago), M. R. Drout (Carnegie), B. Farr (U\nChicago), R. J. Foley (UCSC), W. Fong (Northwestern), D. Fox (Penn State),\nJ. Frieman (Fermilab/UChicago), M.S.S. Gill (Stanford), R. Gruendl (NCSA),\nK. Herner (Fermilab), D. Holz (UChicago), R. Kessler (UChicago), H. Lin\n(Fermilab), J. Marriner (Fermilab), R. Margutti (Northwestern), J. Marshall\n(TAMU), E. Neilsen (Fermilab), F. Paz-Chincon (NCSA), M. Nicholl (Harvard),\nA. Rest (STScI), M. Sako (UPenn), D. Scolnic (KICP), N. Smith (Arizona), M.\nSoares-Santos (BrandeisU), D. Tucker (Fermilab), V. A. Villar (Harvard), A.\nWalker (NOAO), B. Yanny (Fermilab), P. K. G. Williams (Harvard)\n\nOn behalf of the DESGW+community team:\n\nWe report on observations of LVC trigger G297595 conducted with the Dark\nEnergy camera (DECam) on the Blanco 4-m telescope at CTIO (program\n2017B-0110, PI: Berger) for several nights starting on 2017-08-15 UT.\nObservations consisted of 90 second exposures in i band.\n\nOn the first night observations started at 2017-08-15 06:00 UT (19 hours\nafter the GW detection). In 4 hours of observing time we performed two\ntilings of the area and covered 90% of the localization probability given\nby the LVC sky map available at the time. On the second night observations\nstarted at 2017-08-16 06:00 UT. We performed a second visit of the area\ncovered in the previous night. At 07:02 UT a new map was released by LVC.\nOur observations overlapped 49% of the probability on the new map. We\nrecomputed our sky footprint and, at 08:11 UT, started observations\ncovering a total of 84% of the new localization probability. On the third\nnight we performed a second tiling of the new area starting at 2017-08-17\n06:30 UT. We revisited the new area 4 more times. The last visit of the\nregion was on the night of 2017-08-26 UT.\n\nDECam has a 3 sq-deg field of view and typically reaches i,z = 23rd\nlimiting magnitudes for 90 second exposures. We have covered 160 sq-deg,\ncorresponding to 84% of the updated localization probability, to 23rd mag\nin i band.\n\nThe table below lists the coordinates observed (first epoch only). Data\nreduction is being performed using the DES software pipeline and an\nindependent pipeline on the Harvard Odyssey computer cluster. Difference\nimaging is being performed using pre-existing DES exposures as templates.\nAnalysis is underway.\n\n\n108 rows returned\nexpnumradecairmassseeingmag_limtime_since_trigger\n667113 33.081017 -53.7447 1.36 1.131 22.70 19:29:38.500579\n667114 34.526567 -47.6579 1.35 1.164 22.70 19:31:49.617109\n667115 34.908854 -45.6289 1.35 1.232 22.64 19:33:49.704425\n667116 37.8198 -40.5565 1.39 1.496 22.41 19:35:57.406561\n667117 40.14195 -37.5131 1.43 1.4 22.46 19:37:56.378284\n667118 41.501492 -50.7013 1.43 1.16 22.64 19:40:27.438763\n667120 44.232871 -31.4262 1.52 1.179 22.59 19:45:04.830179\n667121 46.071733 -28.3827 1.58 1.174 22.59 19:47:04.174300\n667122 46.098692 -30.4117 1.55 1.118 22.66 19:49:01.944646\n667123 46.386629 -44.6144 1.47 1.143 22.68 19:51:35.334292\n667125 47.925883 -29.3972 1.56 1.312 22.46 19:56:11.468952\n667126 47.993579 -31.4262 1.53 1.311 22.48 19:58:09.701798\n667127 48.068325 -33.4551 1.5 1.323 22.46 20:00:09.554130\n667128 48.151142 -35.4841 1.48 1.325 22.48 20:02:08.778424\n667129 48.242654 -37.5131 1.46 1.252 22.56 20:04:07.371388\n667130 48.343783 -39.542 1.45 1.194 22.59 20:06:06.372826\n667131 42.266758 -34.4696 1.34 1.178 22.66 20:08:17.035111\n667132 47.864804 -27.3683 1.48 1.222 22.54 20:10:30.827879\n667133 33.620458 -51.7158 1.24 1.084 22.84 20:13:27.625683\n667134 34.099333 -49.6868 1.23 1.049 22.89 20:15:26.147706\n667135 36.02235 -52.7303 1.26 1.139 22.77 20:17:26.087003\n667136 37.345425 -44.6144 1.23 1.516 22.48 20:19:48.078520\n667137 37.594904 -42.5855 1.22 1.292 22.63 20:21:46.394679\n667138 38.82525 -51.7158 1.26 1.175 22.73 20:24:09.877128\n667139 39.859292 -41.571 1.24 1.205 22.68 20:26:33.378343\n667140 40.007792 -39.542 1.23 1.127 22.77 20:28:32.514268\n667141 42.130425 -38.5275 1.25 1.144 22.73 20:30:32.596601\n667142 42.202033 -36.4986 1.25 1.076 22.81 20:32:32.148424\n667143 44.089667 -47.6579 1.27 1.141 22.75 20:34:59.845293\n667145 44.220629 -33.4551 1.25 1.242 22.64 20:39:28.326716\n667146 46.12845 -32.4407 1.28 1.175 22.69 20:41:26.347140\n667147 46.161358 -34.4696 1.26 1.135 22.73 20:43:27.175973\n667148 46.197842 -36.4986 1.26 1.11 22.81 20:45:26.086710\n667149 46.282604 -40.5565 1.25 1.065 22.83 20:47:28.378746\n667150 46.331908 -42.5855 1.25 1.08 22.85 20:49:27.419364\n667151 44.207146 -35.4841 1.21 0.952 22.96 20:51:56.583169\n667153 36.758192 -48.6723 1.16 0.996 22.95 20:56:32.782815\n667154 37.067833 -46.6434 1.15 0.97 22.97 20:58:31.339136\n667155 39.080533 -49.6868 1.18 0.987 22.93 21:00:30.766293\n667156 39.308158 -47.6579 1.16 0.984 22.97 21:02:28.452052\n667157 39.511846 -45.6289 1.15 1.051 22.89 21:04:27.301000\n667158 39.694696 -43.5999 1.14 1.112 22.83 21:06:25.419905\n667159 41.636792 -48.6723 1.17 1.105 22.83 21:08:36.460086\n667160 41.757629 -46.6434 1.16 1.01 22.91 21:10:34.758344\n667161 41.866021 -44.6144 1.15 1.019 22.92 21:12:33.041454\n667162 41.9634 -42.5855 1.14 0.992 22.94 21:14:31.312051\n667163 42.051196 -40.5565 1.13 1.011 22.90 21:16:30.358284\n667164 44.114746 -45.6289 1.16 1.007 22.92 21:18:37.993401\n667165 44.137292 -43.5999 1.15 0.942 22.97 21:20:37.989628\n667166 44.157496 -41.571 1.14 1.022 22.88 21:22:36.577622\n667167 44.175796 -39.542 1.13 1.101 22.80 21:24:36.200377\n667168 44.19225 -37.5131 1.13 1.04 22.88 21:26:35.962091\n667169 46.238025 -38.5275 1.14 1.035 22.88 21:28:33.252666\n667170 46.238025 -38.5275 1.14 1.042 22.86 21:30:33.628407\n667637 36.02235 -52.7303 1.12 1.374 22.64 1 day, 21:41:03.836806\n667638 36.411796 -50.7013 1.1 1.19 22.80 1 day, 21:43:01.770738\n667639 36.758192 -48.6723 1.09 1.1 22.88 1 day, 21:44:59.834221\n667640 37.067833 -46.6434 1.08 1.137 22.84 1 day, 21:46:58.881032\n667641 38.537821 -53.7447 1.13 1.022 22.92 1 day, 21:49:14.047259\n667642 39.511846 -45.6289 1.08 0.954 23.01 1 day, 21:51:35.282434\n667643 39.694696 -43.5999 1.07 0.919 23.05 1 day, 21:53:32.996321\n667644 41.349346 -52.7303 1.12 1.049 22.91 1 day, 21:55:58.142319\n667645 41.9634 -42.5855 1.07 0.999 22.98 1 day, 21:58:24.355336\n667646 44.175796 -39.542 1.07 0.949 23.05 1 day, 22:00:25.022154\n667647 46.197842 -36.4986 1.07 1.018 22.99 1 day, 22:02:23.856376\n667648 46.591183 -50.7013 1.12 1.138 22.84 1 day, 22:04:55.598562\n667649 48.068325 -33.4551 1.07 1.033 22.94 1 day, 22:07:36.909732\n667650 49.818992 -30.4117 1.08 1.013 22.95 1 day, 22:09:35.571894\n667651 51.475817 -27.3683 1.09 1.035 22.92 1 day, 22:11:34.892573\n667652 50.907329 -44.6144 1.1 1.151 22.84 1 day, 22:14:14.888743\n667653 52.292954 -37.5131 1.09 1.103 22.89 1 day, 22:16:34.033753\n667654 52.511683 -39.542 1.09 1.205 22.78 1 day, 22:18:32.990654\n667655 38.82525 -51.7158 1.09 1.21 22.78 1 day, 22:21:07.325116\n667656 39.080533 -49.6868 1.07 1.127 22.89 1 day, 22:23:05.824461\n667657 39.308158 -47.6579 1.06 1.211 22.80 1 day, 22:25:03.367628\n667658 41.501492 -50.7013 1.08 1.173 22.84 1 day, 22:27:03.333138\n667659 41.636792 -48.6723 1.07 1.194 22.82 1 day, 22:29:01.859464\n667660 41.757629 -46.6434 1.06 1.128 22.90 1 day, 22:30:59.623472\n667661 41.866021 -44.6144 1.05 1.032 23.00 1 day, 22:32:57.799484\n667662 44.030158 -51.7158 1.09 1.181 22.83 1 day, 22:35:36.632387\n667663 44.157496 -41.571 1.04 1.062 22.94 1 day, 22:38:02.053494\n667664 46.238025 -38.5275 1.03 1.125 22.91 1 day, 22:40:01.143328\n667665 48.151142 -35.4841 1.03 1.04 22.95 1 day, 22:42:00.345576\n667666 48.871258 -47.6579 1.07 1.082 22.91 1 day, 22:44:27.561412\n667667 49.93155 -32.4407 1.03 1.047 22.97 1 day, 22:47:02.461422\n667668 50.700404 -42.5855 1.05 1.039 22.97 1 day, 22:49:24.916068\n667669 51.607892 -29.3972 1.03 1.071 22.92 1 day, 22:51:55.034195\n667670 51.754275 -31.4262 1.03 1.071 22.94 1 day, 22:53:54.540442\n667671 51.916125 -33.4551 1.03 1.155 22.86 1 day, 22:55:53.947934\n667672 52.095046 -35.4841 1.03 1.091 22.96 1 day, 22:57:53.351123\n667673 44.061646 -49.6868 1.07 1.16 22.88 1 day, 23:01:06.555281\n667674 44.089667 -47.6579 1.05 1.151 22.88 1 day, 23:03:04.628618\n667675 44.114746 -45.6289 1.04 1.135 22.89 1 day, 23:05:04.104997\n667676 44.137292 -43.5999 1.03 1.16 22.86 1 day, 23:07:02.134092\n667677 46.282604 -40.5565 1.02 1.139 22.91 1 day, 23:09:01.550370\n667678 46.331908 -42.5855 1.03 1.207 22.84 1 day, 23:10:59.205759\n667679 46.386629 -44.6144 1.04 1.294 22.77 1 day, 23:12:57.317365\n667680 46.447529 -46.6434 1.05 1.258 22.81 1 day, 23:14:56.838481\n667681 46.5153 -48.6723 1.06 1.339 22.73 1 day, 23:16:54.491556\n667682 48.242654 -37.5131 1.01 1.423 22.69 1 day, 23:19:19.875913\n667683 48.343783 -39.542 1.02 1.204 22.86 1 day, 23:21:19.338861\n667684 48.455683 -41.571 1.02 1.166 22.91 1 day, 23:23:17.317086\n667685 48.5799 -43.5999 1.03 1.237 22.83 1 day, 23:25:16.075497\n667686 48.71775 -45.6289 1.04 1.19 22.85 1 day, 23:27:14.313076\n667687 50.05605 -34.4696 1.01 1.143 22.92 1 day, 23:29:40.767316\n667688 50.193629 -36.4986 1.01 1.28 22.80 1 day, 23:31:40.215267\n667689 50.345717 -38.5275 1.01 1.177 22.89 1 day, 23:33:38.757192\n667690 50.514 -40.5565 1.02 1.062 23.00 1 day, 23:35:36.910088",
  "circularId": 21789,
  "createdOn": 1504387998000,
  "email": "marcelle.soares.santos@gmail.com",
  "subject": "LIGO/Virgo G297595: DECam observations of BBH merger region of interest",
  "submitter": "M. Soares-Santos at Fermi Lab  <marcelle.soares.santos@gmail.com>",
  "eventId": "LIGO/Virgo G297595"
}