TITLE: GCN CIRCULAR NUMBER: 24292 SUBJECT: LIGO/Virgo S190426c: MMT Follow-Up Observations DATE: 19/04/27 16:25:32 GMT FROM: Griffin Hosseinzadeh at Harvard U G. Hosseinzadeh, S. Gomez, L. Patton, E. Berger, P. K. Blanchard, T. Eftekhari, J. Gill, 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 S190426c (GCN 24237) with the MMTCam instrument on the MMT 6.5-m telescope: Name R.A. Dec. Date UT 18191810+8807285 274.825439 88.124603 2019-04-27 08:38:51.40 18215068+8642223 275.461182 86.706215 2019-04-27 08:40:44.16 18242867+8642139 276.119476 86.703888 2019-04-27 08:42:02.29 19301513+8540516 292.563049 85.681000 2019-04-27 08:44:01.04 20412914+8626330 310.371429 86.442513 2019-04-27 08:47:15.62 20441724+8654219 311.071838 86.906105 2019-04-27 08:48:44.73 3085923 313.123840 86.186646 2019-04-27 08:50:06.79 20452666+8620428 311.361084 86.345238 2019-04-27 08:53:22.23 20592695+8454369 314.862305 84.910271 2019-04-27 08:55:00.27 20110295+4637149 302.762329 46.620808 2019-04-27 09:00:55.59 20113931+4550035 302.913818 45.834320 2019-04-27 09:03:02.52 20114858+4657335 302.952423 46.959324 2019-04-27 09:04:39.00 20132761+4630313 303.365082 46.508705 2019-04-27 09:06:17.34 20134502+4726333 303.437622 47.442604 2019-04-27 09:07:51.07 20152058+4555282 303.835785 45.924526 2019-04-27 09:09:30.54 20201548+4720364 305.064514 47.343445 2019-04-27 09:12:40.37 20242781+4900526 306.115875 49.014629 2019-04-27 09:14:19.34 20354336+4953165 308.930695 49.887932 2019-04-27 09:15:46.70 20224302+5636145 305.679291 56.604050 2019-04-27 09:17:53.43 20244336+5245430 306.180695 52.761951 2019-04-27 09:19:32.34 20245359+5610264 306.223328 56.174004 2019-04-27 09:20:53.09 20260256+5552523 306.510681 55.881222 2019-04-27 09:22:19.39 20273404+5015483 306.891846 50.263424 2019-04-27 09:23:52.13 20273859+5353393 306.910797 53.894264 2019-04-27 09:25:23.97 20281516+5641284 307.063202 56.691227 2019-04-27 09:26:51.40 20290191+5817016 307.257996 58.283779 2019-04-27 09:28:13.83 20291160+5219510 307.298340 52.330837 2019-04-27 09:29:55.67 20300804+5415120 307.533508 54.253361 2019-04-27 09:31:48.43 20304675+6259395 307.694824 62.994316 2019-04-27 09:37:44.30 20322187+5812031 308.091156 58.200874 2019-04-27 09:39:26.33 20334424+5403120 308.434357 54.053345 2019-04-27 09:41:06.11 20334533+6254178 308.438904 62.904968 2019-04-27 09:42:45.02 20352447+5759548 308.851959 57.998581 2019-04-27 09:44:34.03 20354995+6208172 308.958160 62.138115 2019-04-27 09:47:16.72 20355212+5549587 308.967194 55.832996 2019-04-27 09:49:52.60 20370886+5756538 309.286957 57.948280 2019-04-27 09:51:23.64 20373532+5628217 309.397186 56.472702 2019-04-27 09:52:50.88 20384775+6128473 309.698975 61.479832 2019-04-27 09:54:43.33 20385946+5351220 309.747772 53.856125 2019-04-27 09:56:30.10 20391360+6454369 309.806671 64.910263 2019-04-27 09:58:12.37 20404068+6437003 310.169525 64.616753 2019-04-27 09:59:56.03 20431546+5424171 310.814453 54.404751 2019-04-27 10:02:35.77 20450027+6441410 311.251160 64.694733 2019-04-27 10:04:16.29 20452857+6332249 311.369080 63.540272 2019-04-27 10:05:41.40 20453196+6157519 311.383179 61.964432 2019-04-27 10:07:11.51 20482612+6414178 312.108856 64.238281 2019-04-27 10:08:31.27 20492307+6412331 312.346161 64.209221 2019-04-27 10:10:38.44 20495907+6207478 312.496155 62.129963 2019-04-27 10:12:07.42 20515127+6309235 312.963654 63.156536 2019-04-27 10:13:43.40 20581565+6217178 314.565247 62.288288 2019-04-27 10:15:27.92 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.