GCN Circular 26473
Subject
LIGO/Virgo S191216ap: No significant counterpart candidates in SAGUARO observations
Date
2019-12-17T14:13:53Z (5 years ago)
From
Michael J. Lundquist at University of Arizona <mlundquist@email.arizona.edu>
Michael J. Lundquist, David J. Sand (UA), Wen-fai Fong, Jillian
Rastinejad, Kerry Paterson (Northwestern), Jennifer Andrews (UA), Sam Wyatt
(UA), Eric Christensen, Alex Gibbs, Frank Shelly, report on behalf of the
SAGUARO collaboration:
We initiated observations of 24 fields (each 5 deg^2, totalling 120 deg^2)
within the LVC localization region for the GW trigger S191216ap (LVC Circ
26454) starting on 2019-12-17 at 1:25 UT (3.9 hours after the GW trigger)
with the 1.5m Catalina Sky Survey (CSS) telescope on Mt. Lemmon, AZ.
Below are the field centers observed.
RA Dec
321.5850 1.10417
321.3495 3.3125
321.3495 5.52081
321.1110 7.72917
321.1110 9.93747
320.8695 12.1458
323.1060 12.1458
320.3775 14.3541
322.6410 14.3541
320.1255 16.5625
322.4055 16.5625
321.9225 18.7708
319.6155 18.7708
321.4290 20.9792
319.0905 20.9792
320.9205 23.1875
318.5520 23.1875
320.1330 25.3958
317.7180 25.3958
319.3155 27.6042
316.8495 27.6042
318.4605 29.8125
317.5710 32.0208
316.6425 34.2291
Overall image quality was poor. We perform real-time processing and image
subtraction (described in Lundquist et al. 2019, ApJL, 881, 2). After
discarding known moving objects, stellar sources and known transients
(cross-correlating with the Transient Name Server and the ZTF alert
stream), we find no significant candidates with S/N>5, although a more
detailed analysis is ongoing.
We have posted our pointings to the Treasure Map, and encourage others to
do the same:
http://treasuremap.space/alerts?graceids=S191216ap
SAGUARO is supported by the National Science Foundation under Award Nos.
AST-1909358 and AST-1908972.