TITLE: GCN CIRCULAR NUMBER: 24286 SUBJECT: LIGO/Virgo S190426c: CNEOST Optical Observations DATE: 19/04/27 15:08:03 GMT FROM: Dong Xu at NAOC/CAS Bin Li, Hai-bin Zhao (PMO), Dong Xu, Zi-pei Zhu, Bang-yao Yu, Tian-meng Zhang, Xu Zhou, Chen-zhou Cui, Hui-juan Wang (NAOC), Xue-feng Wu, Zhi-ping Jin, Tian-rui Sun, Hao Lu, Ge-tu Zhaori, Ren-quan Hong, Long-fei Hu (PMO), Xiao-feng Wang, Wen-xiong Li (THU), Li-fan Wang (PMO/TAMU), Jin-zhong Liu (XAO), Ji-rong Mao, Jin-ming Bai (YNAO) report on behalf of the CNEOST collaboration: We conducted optical imaging observations for gravitational wave alert with Chinese Near Earth Object Survey Telescope (CNEOST) at Xuyi astronomical station in Jiangsu Province, China (32.75N, 118.47E). The information of observations and preliminary results are listed below. Alert: LIGO/Virgo S190426c (GCN 24237) StartTime (UT): 2019-04-26T16:38:56.981 EndTime (UT): 2019-04-26T20:07:36.183 Skycover (Square Degree): 774.0 Telescope FoV (Square Degree):9.0 # id FoV_CentRA(Deg) FoV_CentDEC(Deg) LimiteMag3\sigma 5\sigma 10\sigma Filter 1 280.820160 85.517708 20.667 19.595 18.319 VR 2 315.430237 85.439629 - - - VR 3 349.655731 85.372475 - - - VR 4 0.272468 85.374985 20.421 19.412 18.049 VR 5 348.235748 82.581619 20.467 19.409 18.071 VR 6 326.778412 82.607399 - - - VR 7 305.197693 82.690369 - - - VR 8 283.561981 82.690361 - - - VR 9 280.820160 85.517708 20.667 19.595 18.319 VR 10 315.430237 85.439629 - - - VR 11 349.655731 85.372475 - - - VR 12 0.272468 85.374985 20.421 19.412 18.049 VR 13 348.235748 82.581619 20.467 19.409 18.071 VR 14 326.778412 82.607399 - - - VR 15 305.197693 82.690369 - - - VR 16 283.561981 82.690361 - - - VR 17 280.820160 85.517708 20.667 19.595 18.319 VR 18 315.430237 85.439629 - - - VR 19 349.655731 85.372475 - - - VR 20 0.272468 85.374985 20.421 19.412 18.049 VR 21 348.235748 82.581619 20.467 19.409 18.071 VR 22 326.778412 82.607399 - - - VR 23 305.197693 82.690369 - - - VR 24 283.561981 82.690361 - - - VR 25 319.178864 74.233849 20.685 19.654 18.534 VR 26 324.038544 77.046799 20.603 19.549 18.370 VR 27 311.633820 77.040756 20.651 19.597 18.336 VR 28 316.798065 79.851402 20.538 19.540 18.278 VR 29 332.518555 79.810440 - - - VR 30 348.177490 79.773155 - - - VR 31 348.773438 76.988274 20.251 19.286 18.005 VR 32 336.383240 77.012527 20.530 19.461 18.209 VR 33 339.602112 74.196800 20.347 19.336 18.174 VR 34 329.386444 74.234039 20.458 19.428 18.281 VR 35 319.178864 74.233849 20.685 19.654 18.534 VR 36 324.038544 77.046799 20.603 19.549 18.370 VR 37 311.633820 77.040756 20.651 19.597 18.336 VR 38 316.798065 79.851402 20.538 19.540 18.278 VR 39 332.518555 79.810440 - - - VR 40 348.177490 79.773155 - - - VR 41 348.773438 76.988274 20.251 19.286 18.005 VR 42 336.383240 77.012527 20.530 19.461 18.209 VR 43 339.602112 74.196800 20.347 19.336 18.174 VR 44 329.386444 74.234039 20.458 19.428 18.281 VR 45 319.178864 74.233849 20.685 19.654 18.534 VR 46 324.038544 77.046799 20.603 19.549 18.370 VR 47 311.633820 77.040756 20.651 19.597 18.336 VR 48 316.798065 79.851402 20.538 19.540 18.278 VR 49 332.518555 79.810440 - - - VR 50 336.383240 77.012527 20.530 19.461 18.209 VR 51 299.525238 46.251789 20.401 19.480 18.006 VR 52 311.657715 46.230133 20.250 19.320 17.684 VR 53 304.592407 43.480080 20.410 19.500 18.255 VR 54 302.534668 40.635784 20.422 19.507 17.783 VR 55 311.936005 37.808170 20.186 19.251 17.812 VR 56 301.344299 37.860779 20.372 19.498 17.506 VR 57 300.906097 35.026001 20.290 19.387 17.618 VR 58 307.813385 32.240044 20.193 19.273 18.032 VR 59 297.888336 32.272041 20.199 19.359 17.442 VR 60 302.225403 29.456776 20.353 19.436 18.201 VR 61 306.943420 26.630651 20.129 19.248 17.940 VR 62 297.592102 26.692783 20.381 19.452 17.974 VR 63 303.023682 23.862503 20.257 19.336 17.940 VR 64 297.782227 18.269867 20.261 19.334 17.345 VR 65 299.220764 15.473767 20.075 19.172 17.501 VR 66 298.443146 12.670787 19.969 19.078 17.526 VR 67 296.242340 7.066733 19.988 19.091 17.686 VR 68 314.732300 63.022617 20.353 19.402 18.339 VR 69 311.992279 57.445961 20.423 19.495 18.441 VR 70 309.506592 54.678425 20.287 19.374 18.141 VR 71 311.713623 49.022232 20.455 19.516 18.160 VR 72 303.515625 51.858234 20.357 19.434 17.994 VR 73 306.784424 57.462719 20.414 19.480 18.313 VR 74 308.590790 63.066647 20.359 19.407 18.222 VR 75 310.045654 60.261044 20.435 19.493 18.319 VR 76 314.339447 54.666424 20.478 19.538 18.500 VR 77 312.579285 51.856945 20.420 19.500 18.288 VR 78 303.160950 49.069408 20.422 19.490 18.076 VR 79 301.595581 57.451702 20.377 19.413 18.106 VR 80 302.417633 63.046188 20.313 19.381 18.075 VR 81 315.717224 60.247940 20.431 19.481 18.476 VR 82 317.155365 57.423546 20.405 19.476 18.382 VR 83 308.046173 51.860016 20.336 19.460 18.051 VR 84 307.452972 49.037590 20.331 19.418 18.011 VR 85 304.680237 54.659714 20.349 19.443 18.070 VR 86 304.424927 60.269768 20.302 19.374 18.127 VR Detailed data analysis is still in progress and any interesting transients will be reported later.