{
  "bibcode": "2011GCN.12329....1F",
  "body": "Derek B. Fox (Penn State) reports: \n\n\"The new R~16 mag optical source identified by Li & Filippenko (GCN\n12328) in their follow-on observations of the recent Swift BAT image\ntrigger 502415 / GRB 110905A (Pagani et al., GCN 12327), is almost\ncertainly the optical counterpart to the recently-discovered X-ray\ntransient MAXI J1836-194 (Negoro et al., ATel #3611).  This likely\nblack hole X-ray binary system has an associated optical (Kennea et\nal., ATel #3613), NIR (Rau, Greiner & Sudilovsky, ATel #3619) and\nradio (Miller-Jones et al., ATel #3628) counterpat with coordinate\nposition (most accurately known from EVLA observations) consistent to\n<~1 arcsec with the optical source of Li & Fillippenko.\n\nGiven that BAT trigger #502415 is a BAT image trigger with\nlocalization consistent with the position of the new transient, this\nraises the question of whether BAT trigger #502415 was generated by\nhigh-energy variability of MAXI J1836-194 itself rather than being due\nto a bona fide gamma-ray burst.\n\nIf GRB 110905A is a genuine gamma-ray burst -- distinct from and\nunrelated to MAXI J1836-194 -- the source reported by Li &\nFillippenko, being the optical counterpart of MAXI J1836-194, is\nalmost certainly not the burst's optical afterglow.\n\nThe author cites a private communication from J. Greiner as first to\npoint out this possible interpretation of events.\"",
  "circularId": 12329,
  "createdOn": 1315209870000,
  "email": "dfox@astro.psu.edu",
  "subject": "GRB 110905A: Potential BAT trigger on MAXI J1836-194",
  "submitter": "Derek Fox at PSU  <dfox@astro.psu.edu>",
  "eventId": "GRB 110905A"
}