{
  "bibcode": "2019GCN.24455....1D",
  "body": "P. D'Avanzo (INAF-OAB), L. Izzo (IAA), S. Yang (INAF-OAPd), E. Palazzi \n(INAF-OAS), S Campana (INAF-OAB),\n\nS. Benetti (INAF-OAPd), M.G. Bernardini (INAF-OAB), M.T. Botticella \n(INAF-OAC), M. Branchesi (GSSI),\n\nA. Bulgarelli (INAF-OAS), S. Campana (INAF-OAB), E. Cappellaro \n(INAF-OAPd), R. Carini (INAF-OAR), R. Ciolfi (INAF-OAPd),\n\nS. Covino (INAF-OAB), V. D'Elia (ASI-SSDC), M. Della Valle (INAF-OAC), \n �A. Grado (INAF-OAC), G. Greco (Univ. Urbino),\n\nA. Melandri (INAF-OAB), L. Nicastro (INAF-OAS), S. Piranomonte \n(INAF-OAR), A. Rossi (INAF-OAS), V. Testa (INAF-OAR),\n\nL. Tomasella (INAF-OAPd), E. Brocato (INAF-OAAb, INAF-OAR), on behalf of \nGRAWITA report:\n\n\nWe carried out optical follow-up observations of the LIGO/Virgo GW \ntrigger S190509g (LVC, GCN Circ. 24442) with the 60-cm\n\nrobotic telescope REM located at the La Silla Observatory (Chile). The \nobservations started at 2019-05-10 at 05:27:51 UT,\n\nsimultaneously in the g, r, i, z bands (the REM NIR camera was not \noperational).\n\n\nWe observed the following galaxies within the 90% probability of the \ninitial bayestar skymap visible from La Silla:\n\n\nRA(J2000) Dec(J2000) Dist(Mpc) Abs_Mag(B)\n\n--------------------------------------------------------------\n\n �14:40:29.9303:14:01.1 ��400.91 -20.19\n\n �13:40:22.5600:14:12.1 ��335.74 -19.36\n\n �13:39:26.41-04:38:43.7 ��331.50 -20.14\n\n �14:40:56.6403:09:10.7 ��376.70 -19.83\n\n �14:17:12.5701:59:31.5 ��261.43 -20.30\n\n �13:17:09.12-00:57:28.1 ��366.44 -19.74\n\n �13:40:11.16-04:36:24.0 ��351.69 -19.99\n\n �14:55:34.8008:39:43.5 ��376.70 -19.51\n\n �14:32:03.12-01:10:03.7 ��243.01 -19.33\n\n �14:31:11.16-02:37:20.2 ��315.22 -19.81\n\n �14:29:11.5209:38:11.6 ��385.48 -18.77\n\n �14:17:44.1601:58:52.6 ��259.42 -20.12\n\n �14:30:39.4007:16:30.0 ���21.40 -19.47\n\n �14:44:57.6000:50:40.1 ��317.69 -18.18\n\n �13:53:50.6400:50:43.3 ��279.25 -19.74\n\n\nNo clear counterpart for S190509g is found down to a typical 3sigma \nmagnitude of r > 19 (AB).\n\n\nWe report the presence of a possible transient (likely unrelated to \nS190509g) found in the analysis of the REM\n\nframes at the following coordinates (J2000):\n\nRA = 14:29:15.99\n\nDec = +09:41:12.3\n\n(+/- 1\").\n\n\nThe source has a magnitude of r = 17.3 +/- 0.1 (AB, calibrated against \nthe SDSS). We note that this object is\n\n3.5\" from the SDSS galaxy SDSS J142916.22+094112.1, whose catalogue \nmagnitude is r = 22.56 +/- 0.20 and\n\nphotometric redshift is z = 0.182 +/- 0.073.\n\n\nFurther analysis and observations are planned.",
  "circularId": 24455,
  "createdOn": 1557499366000,
  "email": "mgbernardini79@gmail.com",
  "subject": "LIGO/Virgo S190510g: GRAWITA REM optical observations",
  "submitter": "Maria Grazia Bernardini at INAF/Brera  <mgbernardini79@gmail.com>",
  "eventId": "LIGO/Virgo S190510g"
}