[vsnet-grb-info 23633] LIGO/Virgo S190910h and S190910d: WHT photometry of ZTF candidates

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25732
SUBJECT: LIGO/Virgo S190910h and S190910d: WHT photometry of ZTF candidates
DATE:    19/09/12 06:26:28 GMT
FROM:    Giacomo Cannizzaro at SRON  <g.cannizzaro at sron.nl>

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 at WHT collaboration:


We 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. 
We obtained the following magnitudes:


Name           rMag      rMagErr   gMag      gMagErr   
-------------------------------------------------------
ZTF19abyheza   18.78     0.04      19.68     0.06
ZTF19abyiwiw   24.1 (L)                           
ZTF19abyhhml                       19.57     0.04
ZTF19abygvmp   18.81     0.05      19.045    0.06
ZTF19abymhyi   24.1 (L)            24.3 (L)
ZTF19abyjcom   22.8 (L)
ZTF19abyjcoo   21.4 (L)            22.5 (L)















ZTF19abyjfiw   21.33     0.07      21.40     0.09



The 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).