GCN Circular 20753
Subject
LIGO/Virgo G275404: NOT Follow-up of MASTER OT
Date
2017-02-26T15:44:25Z (8 years ago)
From
Mansi M. Kasliwal at Caltech <mansi@astro.caltech.edu>
C. Fremling (OKC), F. Taddia (OKC), R. Amanullah (OKC), J. Sollerman (OKC),
M. M. Kasliwal (Caltech)
report on behalf of the iPTF and GROWTH collaborations
We observed the transient MASTER OT J173532.70+103810.5 reported in LVC GCN
#20740, using ALFOSC on the Nordic Optical Telescope, on 2017-02-26 at
05:40 UT.
We do not detect any transient at the reported coordinates, in agreement
with observations from the Liverpool Telescope (LVC GCN # 20750). The
3-sigma limiting (unfiltered) magnitude of our stacked acquisition frames
at the expected position of the transient is ~21.1 mag.
This would imply an extremely fast rate of fading > approx. 10 mag / day!
We caution that there is a variable star (PTF1717w) which is within a few
arcsec of the reported MASTER OT position. But this nearby variable star
only shows variations between roughly 19.0-19.6 mag in R-band in archival
PTF data. Additional follow-up is encouraged.