{
  "bibcode": "2014GCN.15696....1S",
  "body": "L. P. Singer (Caltech), M. M. Kasliwal (Carnegie Observatories/Princeton),\nS. B. Cenko (NASA/GSFC), E. Bellm (Caltech), and Y. Cao (Caltech) report\non behalf of the intermediate Palomar Transient Factory (iPTF)\ncollaboration:\n\nWe have continued to observe four optical transients (Singer et al.,\nGCN 15686) in the Fermi GBM error circle for GRB 140105A (Xiong &\nConnaughton, GCN 15688) with the Palomar 48-inch Oschin telescope\n(P48), the robotic Palomar 60-inch (P60), and the Palomar 200-inch\n(P200) equipped with the Double Beam Spectrograph (DBSP).\n\nAt 33 hours after the burst, with the P48 we obtain the following\nhost-subtracted magnitudes in the Mould R filter:\n iPTF14x,  R = 20.0\n iPTF14ac, R = 20.3\n iPTF14ae, R = 20.5\n\nWith the P60, at 34 hours after the burst, we obtain the following\nmagnitude in the SDSS system:\n iPTF14ai, r = 20.4\n\nWe obtained spectra of all four with the P200. iPTF14x resembles a\nType II supernova. Our spectra for iPTF14ac, iPTF14ae, and iPTF14ai\nshow a mostly featureless continuum.\n\nThe lack of significant optical fading in any of the four candidates\nstrongly argues against association with the GRB.",
  "circularId": 15696,
  "createdOn": 1389074603000,
  "email": "lsinger@caltech.edu",
  "subject": "GRB 140105A: continued iPTF observations and rejection of optical candidates",
  "submitter": "Leo Singer at CIT/PTF  <lsinger@caltech.edu>",
  "eventId": "GRB 140105A"
}