GCN Circular 18484
Subject
LIGO/Virgo G194575: further Pan-STARRS observations of the RA=1hr localisation region
Date
2015-10-27T10:20:18Z (9 years ago)
From
S. J. Smartt at Queens U Belfast <s.smartt@qub.ac.uk>
K. W. Smith, D. Wright, S. J. Smartt (Queen�s University Belfast),
K. Chambers, M. Huber, (IfA, University of Hawaii), E. Magnier,
H. Flewelling, C. Waters, J. Tonry, A. Schultz, N. Primak, A. Heinze,
B. Stalder, L. Denneau, A. Sherstyuk (IfA), C. Stubbs,
M. Coughlin (Harvard), A. Rest (STScI)
Further to GCN 18445, we report that 2 further transients were discovered within
the 45% probability contour of the RA=1hr blob. These transients are listed
below along with their discovery dates. We also recovered LSQ15bjb on
MJD=57316 (i=19.55) and MJD=57317 (i=19.03), as PS transient PS15cog.
Our first detection is 29.14 hrs before the GW trigger, hence although we
confirm the LSQ result that this is indeed a fast rising and bright transient,
it exploded before the LIGO/Virgo detection trigger.
Name RA (J2000) Dec (J2000) Disc. Date Disc Mag filter Notes
LSQ15bjb 00 11 27.61 -06 25 38.4 20151021 19.55 i (1)
PS15coe 00 29 00.31 -01 34 53.6 20151023 20.69 i (2)
PS15cof 00 32 03.01 -05 51 46.9 20151023 21.02 i (3)
(1) LSQ15bjb = PS15cog. The PS1 photometry shows it to be visible 29.14
hours prior to the G194575 event, hence can probably be ruled out as unrelated.
SDSS DR12 reports that the likely host (12.34" away) is
SDSS J001127.44-062549.5, with photometric redshift of ~0.06.
(2) DR12 reports that the likely host (2.2" away) is SDSS J002900.23-013451.7,
with photometric redshift of ~0.15.
(3) DR12 reports that the likely host (3.17" away) is SDSS J003203.21-055146.6,
with photometric redshift of ~0.11.