{
  "bibcode": "2019GCN.25372....1C",
  "body": "T.-W. Chen (MPE), A. Nicuesa Guelbenzu (TLS Tautenburg), M. Fraser (UCD), J. Bolmer (MPE), T. Schweyer (MPE), A. Rau (MPE), S. Klose (TLS Tautenburg), L Salmon (UCD), S. J. Smartt (QUB), A. J. Levan (Radboud Univ), and Paolo D'Avanzo (INAF-OAB) report for a larger collaboration:\n\nWe observed 36 galaxies within the 90% error volume of S190814bv (LVC GCN 25324) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations were obtained on 15 August 2019 between 04:39 and 10:16 UT, 7.5 hours after the GW event. Galaxies were selected from the HOGWARTS code (https://gwtool.watchertelescope.ie/). For each galaxy we obtained on avarage 2.1 min in the optical bands and 3.9 min in the NIR bands. Observations were performed under seeing conditions varying from 1\".0 to 2\".3 with an average seeing of 1\".4, and at an airmass ranging from 1.0 to 1.4 with an average airmass of 1.1. According to these conditions, the typical 3-sigma detection limit in the r' band is 21.3 mag and 19.8 mag in J (all in the AB system).\n\nVisual inspection of the r' and J-band images shows no apparent candidates in any of the images in comparison to archival imaging from Pan-STARRS, DSS and WISE. Although we caution that fainter candidates close to their hosts could be missed in such an inspection. \n\nThe locations of the galaxies observed are\n---------------------------------------------------\nNo.     RA (J2000)        Dec (J2000)\n1        10.676272        -21.774082\n2        10.242757        -22.083128\n3        13.192388        -22.975018\n4        11.781363        -24.370647\n5        23.594837        -32.835316\n6        23.018082        -33.802876\n7        12.180364        -23.561686\n8        13.806392        -26.321253\n9        10.666405        -21.800196\n10        23.089487        -31.092321\n11        12.364808        -26.538301\n12        24.334146        -33.330853\n13        14.254662        -23.837297\n14        21.229847        -30.621069\n15        10.862282        -22.189581\n16        13.704722        -26.371256\n17        22.342892        -32.849354\n18        20.766964        -31.095718\n19        11.442945        -25.920193\n20        9.807239        -22.102215\n21        10.639115        -22.866308\n22        23.877426        -32.970612\n23        12.25617        -23.811317\n24        22.93853        -32.415623\n25        12.441799        -26.443037\n26        12.120861        -22.147444\n27        9.920177        -22.196348\n28        11.870618        -25.440655\n29        10.91611        -21.659298\n30        22.549915        -32.903667\n31        11.472051        -23.772461\n32        11.543399        -24.650192\n33        12.666141        -26.813395\n34        12.320091        -26.219179\n35        13.804421        -24.044033\n36        22.145348        -32.296467\n---------------------------------------------------\nNote: we re-observed those galaxies (numbers 3, 6, 8, 15, 23 and 29) on 16 August 2019 with GROND, in order to obtain one magnitude deeper images to confirm some possible marginally detected sources taken on 15 August. None of these sources were still detected or convincing though, and we hence do not consider them as genuine sources. \n\nWe acknowledge excellent help in obtaining these data from Angela Hempel and R��gis Lachaume on La Silla.",
  "circularId": 25372,
  "createdOn": 1565980857000,
  "email": "jchen@mpe.mpg.de",
  "subject": "LIGO/Virgo S190814bv: GROND imaging of candidate galaxies",
  "submitter": "Ting-Wan Chen at MPE  <jchen@mpe.mpg.de>",
  "eventId": "LIGO/Virgo S190814bv"
}