TITLE: GCN CIRCULAR NUMBER: 24113 SUBJECT: LIGO/Virgo S190412m: J-GEM optical/NIR follow-up observations DATE: 19/04/12 19:10:32 GMT FROM: Masaomi Tanaka at Tohoku University 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).