TITLE: GCN CIRCULAR NUMBER: 27119 SUBJECT: LIGO/Virgo S200213t: No EM counterparts found from continued GECKO observation of host galaxy candidates DATE: 20/02/18 08:36:58 GMT FROM: Gregory SungHak Paek at SNU Gregory S.H. Paek (SNU), Myungshin Im (SNU), Hyun-Il Sung (KASI), Gu Lim (SNU), Joonho Kim (SNU), Sungyong Hwang (SNU), Bomi Park (SNU), Sophia Kim (SNU), Changsu Choi (SNU), Chung-Uk Lee (KASI), Seung-Lee Kim (KASI), Hyung Mok Lee (KASI), on behalf of GECKO team We continued follow-up observation for host galaxy candidates (Paek et al, GCN #27067) with the 1.0-m telescope at the Lemonsan Optical Astronomical Observatory(LOAO), the 1.0-m telescope at the Deokheung Optical Astronomy Observatory(DOAO), and the 0.61-m telescope ate the Sobaeksan Optical Astronomy Observatory(SOAO) in the initial and updated localization area of S200213t (Singer et al, GCN #27042) and overlapped neutrino detection area (Hussain et al, GCN #27043). Each image was taken in R-band with 30 minutes exposure time. No obvious transient has been identified. The list of the inspected targets is given below, and upper limit(UL) is for 3-sigma detection. OBSERVATORY NAME DISTANCE[Mpc] DATE-OBS DEL_JD FILTER UL[AB] NOTE ----------- ---------------------- ------------- ------------------- ------ ------ ------- -------- LOAO PGC11312 169 2020-02-14T02:37:28 0.93 R 21.676 neutrino LOAO UGC02483 91 2020-02-14T04:04:08 1.00 R 21.511 neutrino LOAO 2MASS+03014097+3153413 97 2020-02-14T04:43:56 1.02 R 21.163 neutrino LOAO 2MASS+03012583+3135093 254 2020-02-14T03:15:37 0.96 R 21.626 neutrino LOAO 2MASS+00585413+5236357 138 2020-02-15T03:30:47 1.97 R 20.945 - LOAO 2MASS+01154286+5559475 174 2020-02-15T04:15:28 2.0 R 21.327 - LOAO PGC7302 100 2020-02-15T04:50:59 2.02 R 20.751 - LOAO 2MASS+01192705+5831151 154 2020-02-15T02:37:38 1.93 R 20.967 - LOAO 2MASS+01183038+5156442 127 2020-02-16T03:50:58 2.99 R 21.21 - LOAO PGC137452 179 2020-02-16T03:15:08 2.96 R 21.15 - LOAO PGC7302 100 2020-02-16T02:36:58 2.93 R 21.06 - LOAO PGC137873 174 2020-02-16T04:35:36 3.02 R 20.952 - LOAO NGC0020 77 2020-02-18T02:35:55 4.9 R 20.839 - LOAO 2MASS+00583689+5137088 121 2020-02-18T03:15:05 4.96 R 21.517 - --------------------------------------------------------------------------------------------------- DOAO PGC11312 169 2020-02-14T12:05:30 1.32 R 21.016 neutrino DOAO 2MASS+03012583+3135093 254 2020-02-14T12:36:39 1.35 R 19.96 neutrino DOAO UGC02483 91 2020-02-14T13:01:41 1.36 R 18.646 neutrino --------------------------------------------------------------------------------------------------- SOAO PGC11312 169 2020-02-14T10:27:54 1.26 R 21.432 neutrino SOAO 2MASS+03012583+3135093 254 2020-02-14T10:59:41 1.28 R 21.332 neutrino SOAO UGC02483 91 2020-02-14T11:33:53 1.30 R 21.062 neutrino SOAO 2MASS+03014097+3153413 97 2020-02-14T12:07:19 1.33 R 20.88 neutrino We thank the LOAO opertator for performing the observation. Gravitational-wave EM Counterpart Korean Observatory (GECKO) is a network of 10+ 0.5m to 1m class telescopes over the world.