GCN Circular 20695
Subject
LIGO/Virgo G274296: Observations of initial skymap by project Mini-GWAC of SVOM
Date
2017-02-19T01:27:15Z (8 years ago)
Edited On
2024-11-16T16:13:36Z (4 months ago)
From
Chao Wu at NAOC <wuchao.lamost@gmail.com>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
J.Y. Wei (NAOC), X.H. Han (NAOC), C. WU (NAOC), N. Leroy (LAL),
S. Antier (LAL), L.P. Xin (NAOC), X.M. Meng (NAOC), L. Huang (NAOC),
Y. Xu (NAOC), H.B. Cai (NAOC), J. Wang (NAOC), X.M. Lu (NAOC),
Y.L. Qiu (NAOC), J.S. Deng (NAOC), L. Cao (NAOC), S. Wang (NAOC),
L. Jia (NAOC), S.C. Zou (NAOC), S.F. Liu (NAOC), Q.C. Feng (NAOC),
H.L. Li (NAOC), D.W. Xu (NAOC), Y.J. Xiao (NAOC), W.L. Dong (NAOC),
Y.T. Zheng (NAOC), E.W.Liang (GXU), X.G.Wang (GXU), Y.G. Yang (HBNU),
B. Cordier (CEA), S.N. Zhang (NAOC), D. Dornic (CPPM), B.B. Wu (IHEP),
J.L. Atteia (IRAP), D. Götz (CEA), C.Lachaud (APC),
on behalf of the SVOM Gravitational Astronomy group report:
We observed about 1200 square degree (3 sky regions) of the skymap
of the advanced LIGO trigger G274296, with SVOM/Mini-GWAC, at Xinglong
Observatory of NAOC equipped with U9000 camera (FOV~400 square
degree/camera).
SVOM/Mini-GWAC comprises 12 wide field angle cameras (aperture=7cm),
working with unfiltered band. The observations are operated in time-series
mode, taking one exposure in 15 seconds (10s exposure + 5s readout).
The limit magnitude is ~12 mag in R band. We estimate a 52% prior
probability that these 3 regions contain the true location of the
source.
The coordinates of the 3 regions and observation time are list following:
start-obs(UTC) end-obs(UTC) Ra Dec Camera_ID
2017-02-17 12:20:29.0 2017-02-17 13:45:04.7 10:34:48.326 +29:29:08.60 C1
2017-02-17 13:45:30.2 2017-02-17 17:12:33.6 11:58:53.431 +29:29:28.69 C1
2017-02-18 10:53:52.3 2017-02-18 12:57:00.8 09:12:10.933 +10:39:50.19 C6
The first image was taken ~6 hours 20 minutes after the event trigger.
Note that the observations on Feb. 18th. have been done under poor
weather conditions. The limit magnitude is ~10 mag in R band.
No any significant transient is found in our online pipeline. The
image analysis is ongoing in detailed processing with our offline
pipeline.