TITLE: GCN CIRCULAR NUMBER: 24244 SUBJECT: LIGO/Virgo S190425z: Further MMT Follow-Up Observations DATE: 19/04/26 18:37:16 GMT FROM: Griffin Hosseinzadeh at Harvard U G. Hosseinzadeh, E. Berger, P. K. Blanchard, T. Eftekhari, J. Gill, S. Gomez, L. Patton, V. A. Villar, P. K. G. Williams (Harvard U), P. S. Cowperthwaite (Carnegie Obs), R. Chornock (Ohio U), W. Fong, R. Margutti (Northwestern U), and M. Nicholl (U Edinburgh) report: We obtained 30 s i-band images of the following GLADE galaxies (Dalya et al. 2018, MNRAS, 479, 2374) in the LIGO/Virgo localization region of S190425z (GCN 24168) with the MMTCam instrument on the MMT 6.5-m telescope: Name R.A. Dec. Date UT 16590728-0544311 254.780334 -5.741986 2019-04-26 08:30:29.18 58987.0 251.852000 -20.141740 2019-04-26 08:32:14.13 NGC6224 252.077301 6.312206 2019-04-26 08:34:11.44 NGC6051 241.236267 23.932871 2019-04-26 08:36:36.52 IC4572 235.475815 28.134085 2019-04-26 08:40:22.72 UGC10320 244.530502 21.066381 2019-04-26 08:44:29.81 IC4569 235.201462 28.292059 2019-04-26 08:47:01.76 57607 243.740997 21.938314 2019-04-26 08:50:10.58 57472 243.084732 23.001947 2019-04-26 08:51:40.62 IC1219 246.114319 19.482584 2019-04-26 08:53:28.45 UGC10412 247.400574 15.658440 2019-04-26 08:55:23.95 NGC6001 236.941498 28.641853 2019-04-26 08:57:41.17 55883 235.941849 28.415155 2019-04-26 08:59:38.86 57645 243.925613 19.637508 2019-04-26 09:02:13.12 59121 252.840240 7.862305 2019-04-26 09:04:08.24 56949 241.148224 25.189823 2019-04-26 09:06:30.33 58860 251.038666 7.445273 2019-04-26 09:08:30.08 57542 243.441711 22.918877 2019-04-26 09:10:43.92 UGC10224 242.209320 22.042635 2019-04-26 09:13:35.96 58097 246.408646 16.455000 2019-04-26 09:16:56.83 1717114 241.067825 24.812338 2019-04-26 09:18:57.27 59239.0 253.600113 -9.889244 2019-04-26 09:22:17.77 UGC10260 242.991150 20.923468 2019-04-26 09:25:28.05 IC4570 235.343994 28.229799 2019-04-26 09:28:54.53 UGC10035 236.901474 26.063671 2019-04-26 09:42:06.86 57692 244.190460 19.521360 2019-04-26 09:46:51.23 16505342-1500143 252.722595 -15.003985 2019-04-26 09:49:19.19 NGC6240 253.245255 2.400985 2019-04-26 09:51:26.55 UGC10360 245.797256 16.932606 2019-04-26 09:53:38.27 55774 235.152664 28.512449 2019-04-26 09:56:11.90 58735 250.167572 14.351479 2019-04-26 09:58:49.71 IC4621 252.713272 8.783868 2019-04-26 10:00:50.14 NGC6075 242.844025 23.965147 2019-04-26 10:04:43.26 16582619-0319463 254.609146 -3.329548 2019-04-26 10:11:41.89 16073961+2220315 241.915070 22.342087 2019-04-26 10:15:39.64 58028 246.063141 20.183607 2019-04-26 10:17:29.71 54895.0 230.687134 29.769716 2019-04-26 10:19:52.41 IC4505 221.639069 33.408661 2019-04-26 10:21:51.85 58768 250.337082 8.909049 2019-04-26 10:24:47.75 55373 233.193909 28.367073 2019-04-26 10:27:25.07 IC4587 239.965057 25.940653 2019-04-26 10:29:21.52 UGC08145 195.576172 32.890778 2019-04-26 10:31:26.07 57293 242.276917 24.870296 2019-04-26 10:35:04.99 16540875-0738073 253.536499 -7.635365 2019-04-26 10:38:59.44 52138 218.826752 35.118813 2019-04-26 10:41:49.85 16153554+1927123 243.898087 19.453444 2019-04-26 10:44:25.24 59338.0 254.524000 -21.274100 2019-04-26 10:46:46.58 UGC09233 216.145950 35.279827 2019-04-26 10:50:02.28 56421 239.016144 24.447973 2019-04-26 10:52:11.64 1484188 247.218430 15.420772 2019-04-26 10:54:30.92 Comparison of the images to the PS1 3pi survey (Chambers et al. 2016, arXiv:1612.05560) reveals no new sources brighter than ~21 mag within the 2.7 arcmin field of view. We thank Chun Ly and Ben Kunk at MMT for taking these observations and Dallan Porter for help with the target submission.