TITLE:   GCN CIRCULAR
NUMBER:  24320
SUBJECT: LIGO/Virgo S190425z: KPED Follow-Up of ZTF transients
DATE:    19/04/28 05:08:34 GMT
FROM:    Tomas Ahumada at U. of Maryland  <tahumada@astro.umd.edu>

Tomas Ahumada (UMD), Michael W. Coughlin (Caltech), Kai Staats
(Northwestern), Kevin Burdge (Caltech), Richard G. Dekany
<https://arxiv.org/search/astro-ph?searchtype=author&query=Dekany%2C+R+G>
(Caltech), Dmitry A. Duev
<https://arxiv.org/search/astro-ph?searchtype=author&query=Duev%2C+D+A>
(Caltech), Michael Feeney
<https://arxiv.org/search/astro-ph?searchtype=author&query=Feeney%2C+M>
(Caltech), S. R. Kulkarni
<https://arxiv.org/search/astro-ph?searchtype=author&query=Kulkarni%2C+S+R>
(Caltech), Reed Riddle
<https://arxiv.org/search/astro-ph?searchtype=author&query=Riddle%2C+R>
(Caltech) on behalf of the KPED team and the Global Relay of Observatories
Watching Transients Happen (GROWTH) collaboration.

We used the Kitt Peak EMCCD Demonstrator (KPED) on the Kitt Peak 84-inch
telescope (Coughlin et al 2019b) to obtain 300 s r-band images for ZTF
optical transients listed in Kasliwal et al. (GCN 24191) and Anand et al.
(GCN 24311) starting at 9:13:24 UT on 2019-04-27.

The measurement of ZTF19aasckkq is consistent with Perley et al. (GCN
24314) and we report upper limits for the rest of the transients.
Magnitudes are derived after calibrating against PS1:

  ID                            JD RA         DEC magnitude

ZTF19aasckkq    2458600.9291 248.413102  13.910183 r = 20.29 +- 0.18

ZTF19aaskbzh    2458600.9541 206.393046  69.329244 r > 19.65 +- 0.03

ZTF19aasejil       2458600.9837 261.945810    1.653720 r > 20.38 +- 0.34

ZTF19aasckkm   2458600.9248 247.302345  12.930679 r > 19.79 +-  0.18

More observations for this objects are scheduled.


The KPED team thanks the National Science Foundation, the National Optical
Astronomical Observatory and the Murty family for support in the building
and operation of KPED.