{
  "bibcode": "2019GCN.25915....1P",
  "body": "Kerry Paterson (Northwestern), Michael J. Lundquist, David J. Sand (UA), Wen-fai Fong, Jillian Rastinejad (Northwestern), Jennifer Andrews (UA), Sam Wyatt (UA), Eric Christensen, Alex Gibbs, Frank Shelly (UA/LPL), report on behalf of the SAGUARO collaboration:\n\nWe initiated observations of 12 fields (each 5 deg^2, totalling 60 deg^2) within the LVC localization region for the GW trigger S190930s (LVC Circ 25871) starting on 2019-10-01 02:09:22 UT (0.52 days after the GW trigger) with the 1.5m Catalina Sky Survey telescope on Mt. Lemmon, AZ. \n\nBelow are the field centers observed.\n\nRA DEC\n318.8895 7.7292\n318.8895 9.9375\n316.6665 9.9375\n316.3965 12.1458\n315.8490 14.3541\n313.5840 14.3541\n314.1615 12.1458\n319.1415 5.5208\n321.3495 3.3125\n321.3495 5.5208\n318.6330 12.1458\n313.2915 16.5625\nWe have posted our pointings to the Treasure Map, and encourage others to do the same:\nhttp://treasuremap.space/alerts?graceids=S190930s&pointing_status=all&alert_type=Initial\n\nPerforming image subtraction, we find no new transients within the 60 deg^2 searched down to a 3-sigma limit of G~21.3 AB mag (calibrated to Gaia DR2) relative to deep CSS reference images.\n\nA more detailed description of SAGUARO can be found in Lundquist et al. 2019, ApJL, 881, 2. SAGUARO is supported by the National Science Foundation under Award Nos. AST-1909358 and AST-1908972.",
  "circularId": 25915,
  "createdOn": 1569973037000,
  "email": "kerry.paterson@northwestern.edu",
  "subject": "LIGO/Virgo S190930s: no counterpart candidates in SAGUARO/CSS observations",
  "submitter": "Kerry Paterson at Northwestern  <kerry.paterson@northwestern.edu>",
  "eventId": "LIGO/Virgo S190930s"
}