[vsnet-grb-info 21965] LIGO-Virgo GW S190408an: J-GEM optical/NIR follow-up observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24064
SUBJECT: LIGO-Virgo GW S190408an: J-GEM optical/NIR follow-up observations
DATE:    19/04/08 20:58:09 GMT
FROM:    Katsuhiro L. Murata at Nagoya U  <murata at u.phys.nagoya-u.ac.jp>

Murata, K. L. (Tokyo Tech), Sasada, M., Nakaoka, T. (Hiroshima U.),
Morokuma, T. (U. of Tokyo), and Utsumi, Y. (Stanford U./SLAC), on behalf of
J-GEM collaboration

Right after receiving the first gravitational wave alert, S190408an, in the
observing run 3 (O3), we conducted optical and near-infrared imaging
observations of 7 nearby galaxies (see a table below) within the
probability skymap of S190408an with
- 50 cm MITSuME telescope at Akeno Observatory using a 3 color imager in
g’, Rc, Ic
- 50 cm MITSuME telescope at Okayama Astrophysical Observatory using a 3
color imager in g’, Rc, Ic
- Kanata 150 cm telescope at Higashi-Hiroshima Observatory using HONIR -- a
2 color imager in Rc and H (Sakimoto et al. 2012, SPIE, 8846, 884673;
Akitaya et al. 2014, 9147, 91474O; Ui et al. 2014, 9147, 91476C)

We also performed blind imaging survey over 260 deg2 using Tomo-e Gozen
camera on the 105-cm Kiso Schmidt telescope which is a very wide-field (20
deg2 field-of-view) optical CMOS imager (Sako et al. 2018, SPIE, 10702,
107020J). Data reduction is in progress.

name RA Dec
GL221849+205045 334.7061 20.846
GL231817+515551 349.572 51.9309
GL225419+384152 343.5806 38.6978
GL225746+424819 344.4403 42.8053
GL222235+224327 35.6449 22.7242
GL222437+203049 336.153 20.5135
GL184632-384819 281.6345 -38.8053

These observations were done in the framework of J-GEM collaboration
(Morokuma et al. 2016, PASJ, 68, 9L).