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GCN Circular 24113

Subject
LIGO/Virgo S190412m: J-GEM optical/NIR follow-up observations
Date
2019-04-12T19:10:32Z (5 years ago)
From
Masaomi Tanaka at Tohoku University <masaomi.tanaka@astr.tohoku.ac.jp>
Tanaka, M. (Tohoku U.), Niino, Y., Morokuma, T. (U. of Tokyo), 
Tominaga N. (Konan U.), Utsumi, Y. (Stanford U./SLAC), 
Yanagisawa, K. (NAOJ), Murata, K. L. (Tokyo Tech), 
Onozato, H. (Nishi-Harima Astronomical observatory), 
Akitaya, H. (Hiroshima U.), Itoh, R. (Bisei Astronomical observatory), 
Sekiguchi, Y. (Toho U.), Oasa, Y. (Saitama U.), 
on behalf of J-GEM collaboration

We report our optical and near-infrared imaging observations 
for the gravitational wave event S190412m. 
We started our observations about 4.5 hours after receiving the alert.

We performed 390 deg2 wide-field imaging survey,
covering 88.5 % of probability region,
using the Tomo-e Gozen camera on the 105-cm Kiso Schmidt telescope,
a very wide-field (20 deg2 field-of-view) optical CMOS imager
(Sako et al. 2018, SPIE, 10702, 107020J). 
A typical limiting magnitude is about 18.5 mag (no filter). 
Data reduction is in progress. 

We also performed galaxy-targeted observations for 63 galaxies 
(see the table below) selected from the GLADE catalog 
(Dalya et al. 2016) in the probability skymap of S190412m 
using the following telescopes/instruments.
 - 50 cm MITSuME telescope at Akeno Observatory and a 3 color imager (g, Rc, Ic)
 - 50 cm MITSuME telescope at Okayama Astrophysical Observatory and a 3 color imager (g, Rc, Ic)
 - 91 cm Okayama Astrophysical Observatory NIR Wide���Field Camera 
   (OAOWFC, J-band, Yanagisawa, K., et al. 2014, Proc. SPIE, 9147, 91476D, 
   Yanagisawa, K., et al. 2016, Proc. SPIE, 9908, 99085D)
 - 200 cm Nayuta telescope at Nishi-Harima Astronomical Observatory 
   and Nishiharima Infrared Camera (NIC)
We found no apparent transient objects in these galaxies 
to the 5 sigma limiting magnitudes listed below.
 
     galid         ra      dec   No fil   G     R     I     J          obsid        
--------------- -------- ------- ------ ----- ----- ----- ----- --------------------
GL141846+305225 214.6935 30.8735  99.00  ----  ----  ---- 18.03  Kiso Schmidt,OAOWFC
GL124935+150900  192.396   15.15   ---- 18.89 19.14 18.60  ----        MITSuME-Akeno
GL144207+352623  220.531 35.4396   ----  ----  ----  ---- 19.40               Nayuta
GL142013+332950 215.0541 33.4972   ---- 20.04 20.16 18.93 18.76 MITSuME-Akeno,OAOWFC
GL121809-005110 184.5373 -0.8527   ----  ----  ----  ---- 17.91               Nayuta
GL144212+335859 220.5516  33.983   ---- 19.36 20.14  ----  ----        MITSuME-Akeno
GL141357+322058 213.4856 32.3494   ----  ---- 19.69 19.08  ----        MITSuME-Akeno
GL145541+331353 223.9212 33.2313   ---- 20.11 20.25 19.61  ----        MITSuME-Akeno
GL141937+333711  214.905 33.6198   ---- 20.04 20.16 19.41 18.76 MITSuME-Akeno,OAOWFC
GL141348+323200  213.452 32.5335   ---- 20.02 20.29 19.53  ----        MITSuME-Akeno
GL141648+324701 214.1998 32.7837   ---- 20.10 20.17 18.24  ----        MITSuME-Akeno
GL145605+335817 224.0188 33.9714   ---- 20.39 20.12 19.00  ----        MITSuME-Akeno
GL142010+320453  215.042 32.0813  99.00  ----  ----  ---- 18.46  Kiso Schmidt,OAOWFC
GL141930+320951 214.8739 32.1641   ----  ----  ----  ---- 18.46               OAOWFC
GL141400+322606  213.501  32.435   ---- 20.02 20.29 19.53  ----        MITSuME-Akeno
GL144850+333747 222.2104 33.6296  18.57  ----  ----  ---- 18.39  Kiso Schmidt,Nayuta
GL141935+315805  214.894 31.9682   ----  ----  ----  ---- 18.46               OAOWFC
GL143933+342329 219.8879 34.3913  18.96  ----  ----  ----  ----         Kiso Schmidt
GL144328+342849 220.8685 34.4804  18.75  ----  ----  ----  ----         Kiso Schmidt
GL145608+330400 224.0347 33.0664   ---- 20.11  ----  ----  ----        MITSuME-Akeno
GL145317+344500 223.3209 34.7498   ----  ----  ----  ---- 18.91               OAOWFC
GL144338+341310 220.9077 34.2193  18.11  ----  ----  ----  ----         Kiso Schmidt
GL145140+344338 222.9153 34.7271   ----  ----  ----  ---- 18.91               OAOWFC
GL143724+341721 219.3511 34.2891  18.74  ----  ----  ----  ----         Kiso Schmidt
GL145243+343036 223.1807 34.5101   ----  ----  ----  ---- 18.91               OAOWFC
GL144726+333258 221.8566 33.5496  18.70  ----  ----  ----  ----         Kiso Schmidt
GL145602+330229  224.008 33.0414   ---- 20.11  ----  ----  ----        MITSuME-Akeno
GL141425+323945 213.6044 32.6625   ---- 20.02 20.29 19.53  ----        MITSuME-Akeno
GL142016+333321  215.066  33.556   ---- 20.04 20.16 19.41 18.76 MITSuME-Akeno,OAOWFC
GL143657+333905 219.2358 33.6513  18.99  ----  ----  ----  ----         Kiso Schmidt
GL141445+312118 213.6871 31.3549  99.00  ----  ----  ----  ----         Kiso Schmidt
GL141958+321041 214.9927 32.1781   ----  ----  ----  ---- 18.46               OAOWFC
GL141042+314031  212.675 31.6753  99.00  ----  ----  ----  ----         Kiso Schmidt
GL143722+343456 219.3409 34.5822  18.79  ----  ----  ----  ----         Kiso Schmidt
GL145254+341026 223.2263  34.174  18.33  ----  ----  ----  ----         Kiso Schmidt
GL145544+335031 223.9321 33.8419   ---- 20.39 20.12 19.00  ----        MITSuME-Akeno
GL141930+320800 214.8758 32.1333   ----  ----  ----  ---- 18.46               OAOWFC
GL141442+310132  213.673 31.0255  99.00  ----  ----  ----  ----         Kiso Schmidt
GL141937+320803 214.9041 32.1342   ----  ----  ----  ---- 18.46               OAOWFC
GL141317+321752  213.321 32.2979   ----  ---- 19.69 19.08  ----        MITSuME-Akeno
GL144311+340241 220.7952 34.0448   ---- 19.36 20.14  ----  ----        MITSuME-Akeno
GL144233+341714 220.6376 34.2873  19.04  ----  ----  ----  ----         Kiso Schmidt
GL143710+333313 219.2925 33.5536  18.85  ----  ----  ----  ----         Kiso Schmidt
GL145332+343927  223.382 34.6575   ----  ----  ----  ---- 18.91               OAOWFC
GL145319+345357 223.3282 34.8992  17.91  ----  ----  ----  ----         Kiso Schmidt
GL145554+330548 223.9732 33.0966   ---- 20.11  ----  ----  ----        MITSuME-Akeno
GL145223+350140 223.0957 35.0277  18.62  ----  ----  ----  ----         Kiso Schmidt
GL145242+350514 223.1733 35.0873  18.62  ----  ----  ----  ----         Kiso Schmidt
GL143717+341608 219.3228 34.2688  18.74  ----  ----  ----  ----         Kiso Schmidt
GL144156+340041 220.4842 34.0114   ---- 19.36 20.14  ----  ----        MITSuME-Akeno
GL144854+333728 222.2247 33.6244  18.57  ----  ----  ---- 18.39  Kiso Schmidt,Nayuta
GL141358+310446 213.4921 31.0794  99.00  ----  ----  ----  ----         Kiso Schmidt
GL142314+325444 215.8095 32.9122  99.00  ----  ----  ----  ----         Kiso Schmidt
GL145347+323627 223.4462 32.6076  18.19  ----  ----  ----  ----         Kiso Schmidt
GL144456+333012 221.2344 33.5034  18.75  ----  ----  ----  ----         Kiso Schmidt
GL141303+311435 213.2638  31.243  99.00  ----  ----  ----  ----         Kiso Schmidt
GL145405+341331 223.5214 34.2252  18.08  ----  ----  ----  ----         Kiso Schmidt
GL145516+333604  223.816 33.6011  18.35  ----  ----  ----  ----         Kiso Schmidt
GL141318+311401  213.327 31.2335  99.00  ----  ----  ----  ----         Kiso Schmidt
GL144932+332353 222.3853 33.3981  18.70  ----  ----  ----  ----         Kiso Schmidt
GL144526+352547 221.3572 35.4297  99.00  ----  ----  ----  ----         Kiso Schmidt
GL144243+334919 220.6794 33.8221   ---- 19.36  ----  ----  ----        MITSuME-Akeno
GL141827+310941  214.611 31.1615   ----  ----  ----  ---- 18.03               OAOWFC

Note that a limiting mag = 99.00 for Kiso Schmidt is due to failure 
in our real-time data analysis (typical depth is about 18.5 mag).

These observations were done in the framework of J-GEM collaboration
(Morokuma et al. 2016, PASJ, 68, L9).
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