{
  "bibcode": "2015GCN.18779....1G",
  "body": "P. Garnavich (Notre Dame) reports:\n\nR. Pogge (OSU), J. Turner (UVa), and B. Rothberg (LBTO) obtained LBT/MODS\nspectra of iPTF15fen (Cenko et al., GCN 18762), the \"hostless\" candidate\nat 03:21:37.544 +31:27:08.1 (J2000). Spectra were taken 2015 Dec. 31.1 (UT)\nand cover 330 nm to 1.0 microns.\n\nThe r-band acquisition image shows an unresolved source at the position of\nthe iPTF transient. The red Digitized Sky Survey (DSS) image from 1992\nalso shows this source.\n\nThe combined spectrum reveals a blue continuum with broad and\nextremely weak absorption features. The clearest features\ncorrespond to Balmer absorption lines of H-beta, H-gamma,\nand H-delta at low velocity. The source is likely a\nhydrogen-rich accretion disk in outburst.\n\niPTF15fen is probably a Galactic dwarf nova or a nova-like\ncataclysmic variable. No narrow emission is detected at the\ncenter of the Balmer absorption features as often seen in\noutbursting disks, but this may be due to the low signal-to-noise\nratio of these features.",
  "circularId": 18779,
  "createdOn": 1451542422000,
  "email": "pgarnavi@nd.edu",
  "subject": "LIGO/Virgo G211117: LBT Follow-up of iPTF15fen",
  "submitter": "Peter Garnavich at Notre Dame  <pgarnavi@nd.edu>",
  "eventId": "LIGO/Virgo G211117"
}