[vsnet-grb-info 23107] LIGO/Virgo S190728q: LCO Follow-Up of ZTF19abjethn (AT2019lvs)

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25206
SUBJECT: LIGO/Virgo S190728q: LCO Follow-Up of ZTF19abjethn (AT2019lvs)
DATE:    19/07/28 20:43:25 GMT
FROM:    Michael Coughlin at Caltech/LIGO  <mcoughli at caltech.edu>

Tomas Ahumada (UMD) and Michael W. Coughlin (Caltech) on behalf of the Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration.


We used the 2-m telescope at the LCO node at Haleakala Observatory to obtain 180 second g,r, and i-band images for the ZTF optical transient ZTF19abjethn (AT2019lvs) listed in Kasliwal et al. (GCN 25199) starting at 14:50:26.164 UT on 2019-07-28.


The measurements of this transient are consistent with a significant rise in the r-and g-band magnitudes reported by both Kasliwal et al. (GCN 25199), on top of the rise reported by Smartt et al. (GCN 25204), albeit in a different band.


Magnitudes are derived after calibrating against PS1:


u = 18.4 +- 0.1

g  = 17.38 +- 0.03

r = 17.51 +- 0.04

i = 17.62 +- 0.04