{
  "bibcode": "2017GCN.21556....1M",
  "body": "A. Melandri, P. D'Avanzo, S. Campana, S. Covino (INAF-OAB), G. Greco (Urbino University/INFN Firenze), M. Branchesi (GSSI), D. Fugazza (INAF-OAB), L. Amati (INAF-IASF Bo), L. A. Antonelli, (INAF-OAR), S. Ascenzi (INAF-OAR), M.T. Botticella (INAF-OAC), E. Cappellaro (INAF-OAPD), V. D'Elia (INAF-ASDC), F. Getman (INAF-OAC), A. Grado (INAF-OAC), L. Limatola (INAF-OAC), M. Lisi (INAF-OAR), L. Nicastro (INAF-IASF Bo), E. Palazzi (INAF-IAFS Bo), E. Pian (SNS-Pisa), S. Piranomonte (INAF-OAR), L. Pulone (INAF-OAR), A. Rossi (INAF-IASF Bo), G. Stratta (Urbino University/INFN Firenze), G. Tagliaferri (INAF-OAB), V. Testa (INAF-OAR), L . Tomasella (INAF-OAPD), S. Yang (INAF-OAPD), E. Brocato (INAF-OAR) on behalf of GRavitational Wave Inaf TeAm report:\n\n\nWe carried out optical/NIR follow-up observations of the LIGO/Virgo GW trigger G298048 (LVC GCN Circ. 21509, 21513) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile) by performing targeted observations of catalogued galaxies in the LVC skymap. The observations were carried out from 23:11:29 UT on 2017 Aug 17 (i.e. 10.5 hours after the event detection) to 02:08:24 UT on on 2017 Aug 18, simultaneously in the g, r, i, z and H bands. \n\nWe observed 18 galaxies (see table below). Group1 targets were selected within 3sigma from the position of the neutrino candidate reported in LVC GCN Circ. 21511, with a distance consistent with the GW trigger; Group2 targets are a sub-sample of the galaxies within the 50% probability region reported in the LVC GCN Circ. 21516; Group3 targets are galaxies reported in LVC GCN Circ. 21519, 21521.\n\n  RA(J2000)      Dec(J2000)    Distance (Mpc)    \n\n---Group1\n12:04:20.16\t-01:31:49.58   27.41\t\n12:01:11.04\t-01:17:43.30   28.19\t\n12:13:38.88\t-01:17:36.56   34.27\t\n12:02:31.68\t-02:18:11.52   40.08 \t\n12:16:44.16\t-02:48:37.08   45.95 \t\n12:06:52.80\t-04:02:36.96   26.25\n12:00:24.96\t-04:54:49.32   35.73 *\n---------------------------------------\n---Group2\n12:57:27.90     -19:41:28.67   44.75 \n13:07:33.75     -24:00:30.98   43.94 \n13:08:04.32     -23:47:48.64   34.09 \n13:06:56.51     -23:55:01.45   33.65 \n13:07:05.97     -23:40:37.34   33.42 \n13:07:37.73     -23:34:44.11   41.75 \n13:06:24.01     -24:09:50.42   33.43 \n13:07:37.68     -23:56:18.11   45.98 \n13:06:19.39     -22:58:49.18   39.36 \n---------------------------------------\n---Group3\n13:09:47.68     -23:23:02.03   41.66\n13:16:23.25     -26:33:41.03   45.59\n\n*: we detected a possible optical source in this field at the following coordinates: RA(J2000),Dec(J2000) = 12:00:26.76,-04:55:04.2 (+/- 0.5\"). This source is faint, having a magnitude of r~19.3 (i.e. close to the limiting magnitude of our observations) and we cannot establish the nature of this objects. However, its position seems to be consistent (within 3 arcmin) with a minor planet (23444-Kukucin). \n\nA preliminary analysis (also based on visual comparison with the DSS) reveals no obvious optical/NIR candidate counterpart in the above galaxies down to the following magnitudes: r > 19.5, H > 17.0 (AB, 3sigma UL).",
  "circularId": 21556,
  "createdOn": 1503053682000,
  "email": "andy.melandri@gmail.com",
  "subject": "LIGO/Virgo G298048: REM optical/NIR observations",
  "submitter": "Andrea Melandri at INAF-OAB  <andy.melandri@gmail.com>",
  "eventId": "LIGO/Virgo G298048"
}