{
  "bibcode": "2024GCN.36237....1G",
  "body": "P.J. Groot (Radboud/UCT/SAAO), S. Bloemen (Radboud), D. Pieterse\n(Radboud), H. Tranin (U Barcelona), I. Arcavi (TelAviv) and P. Vreeswijk\n(Radboud) report on behalf of the BlackGEM/MeerLICHT consortium:\n\nFollowing the LVK Alert S240422ed (GCN36235, GCN36236) the 0.6m\nBlackGEM and MeerLICHT telescopes array, located at the ESO La Silla,\nChile and SAAO Sutherland, South Africa observatories, have started to\nobserve the error box with the ML1/BG2/BG4 telescopes using a\npredefined sky-grid tiling that covers the accessible part of the\nerror region using the ranked-tiling method as outlined in Ghosh et\nal. (2016). Observations were obtained in the q band using a 2x10-tile\nstrategy. Starting with the highest probability tiles a set of\n10-tiles was observed in q-band filter (440-720nm) using 60s\nexposures, which was repeated directly after the first 10 tiles were\nobserved. Subsequently tiles 11-20 were observed in the same two-visit\nmanner, etc.\n\nObservations started at 2024-04-22 21:34 with MeerLICHT and 2024-04-22\n23:10 with BlackGEM. Sutherland skies show high cirrus, which will\nlimit the photometric depth. La Silla skies are clear. Photometric depth\nwill be limited by the Full Moon.\n\nAll observations are reported to the Gravitational Wave Treasure Map\n(https://treasuremap.space/). Any candidates will be reported to the\nGCN server as well as to the Transient Name Server\n(https://www.wis-tns.org/).\n\nObservations are continuing. \n\nThe BlackGEM/MeerLICHT telescopes are designed, installed and operated\nby a consortium of the following universities and institutions:\nRadboud University, Netherlands Research School for Astronomy NOVA, KU\nLeuven, Armagh Observatory and Planetarium, Danish Technical\nUniversity, Durham University, Hebrew University of Jerusalem, South\nAfrican Astronomical Observatory, Tel Aviv University, Texas Tech\nUniversity, University of Amsterdam, University of Barcelona,\nUniversity of California at Davis, University of Cape Town, University\nof Hamburg, University of Manchester, University of Oxford, University\nof Potsdam, University of Valparaiso, University of Warwick, Weizmann\nInstitute\n\nReferences:\nGhosh et al., 2016, A&A 592, 82\n\n",
  "circularId": 36237,
  "subject": "LIGO/Virgo/KAGRA S240422ed: MeerLICHT and BlackGEM observations report",
  "submittedHow": "email-legacy",
  "createdOn": 1713831709183,
  "eventId": "LIGO/Virgo/KAGRA S240422ed",
  "submitter": "Paul Groot at Radboud University Nijmegen <p.groot@astro.ru.nl>"
}