{
  "bibcode": "2019GCN.25732....1C",
  "body": "G. Cannizzaro (SRON/Radboud Univ), I. Pastor-Marazuela (API/ASTRON), P. Jonker (SRON/Radboud Univ), K. Maguire (TCD), M. Fraser (UCD), S. Brennan (UCD) and M Perez Torres (IAC) report on behalf of the GW@WHT collaboration:\n\n\nWe performed optical photometry on the optical transients reported by the Zwicky Transient Facility (GCN 25722 and 25727) localised within the sky error region of the gravitational wave trigger S190910h (GCN 25707) with the ACAM instrument mounted on the William Herschel Telescope located at the Roque de Los Muchachos Observatory, La Palma, Spain. \nWe obtained the following magnitudes:\n\n\nName           rMag      rMagErr   gMag      gMagErr   \n-------------------------------------------------------\nZTF19abyheza   18.78     0.04      19.68     0.06\nZTF19abyiwiw   24.1 (L)                           \nZTF19abyhhml                       19.57     0.04\nZTF19abygvmp   18.81     0.05      19.045    0.06\nZTF19abymhyi   24.1 (L)            24.3 (L)\nZTF19abyjcom   22.8 (L)\nZTF19abyjcoo   21.4 (L)            22.5 (L)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nZTF19abyjfiw   21.33     0.07      21.40     0.09\n\n\n\nThe photometry was obtained without performing image subtraction. With (L) we indicate 3-sigma limiting magnitudes. We note that ZTF19abyheza and ZTF19abyiwiw are within the sky localisation of gravitational wave trigger S190910d (GCN 25695).",
  "circularId": 25732,
  "createdOn": 1568269588000,
  "email": "g.cannizzaro@sron.nl",
  "subject": "LIGO/Virgo S190910h and S190910d: WHT photometry of ZTF candidates",
  "submitter": "Giacomo Cannizzaro at SRON  <g.cannizzaro@sron.nl>",
  "eventId": "LIGO/Virgo S190910h"
}