[vsnet-grb-info 22220] LIGO/Virgo S190425z: NOT photometry of ZTF19aasckkq
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Apr 28 13:20:34 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 24319
SUBJECT: LIGO/Virgo S190425z: NOT photometry of ZTF19aasckkq
DATE: 19/04/28 04:18:11 GMT
FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani at dark-cosmology.dk>
L. Izzo (HETH/IAA-CSIC), D. B. Malesani (DAWN/NBI and DARK/NBI), R.
Carini (INAF/OAR) report:
We observed the field of ZTF19aasckkq, reported by the Zwicky Transient
Facility (Anand et al., GCN 24311) to lie within the localization area
of the LIGO/Virgo trigger S190425z (GCN 24168). We used the Nordic
Optical Telescope (NOT) located in La Palma (Canary Islands, Spain) and
equipped with the AlFOSC camera.
We report the following magnitudes on the approximate date April 28.14
UT (2.8 days after the explosion of S190425z):
g = 20.63 +- 0.02
r = 20.33 +- 0.02
i = 20.29 +- 0.02
These magnitudes are calibrated against the Pan-STARRS survey; no
subtraction of the host galaxy was attempted, but the target is
relatively isolated and host contamination should not be a major
contribution. Our measurements are consistent with those reported by
Anand et al. (GCN 24311) on April 26 (unspecified time), as well as by
Perley et al. (GCN 24314) on April 27.14 UT.
The object seems therefore slowly variable, and less likely to be
associated with S190425z.
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