{
  "bibcode": "2014GCN.15888....1H",
  "body": "K. Hurley, on behalf of the Interplanetary Network,\n\nS. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, \nD. Svinkin, and T. Cline on behalf of the Konus-Wind team,\n\nI. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,\non behalf of the HEND-Odyssey GRB team,\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on\nbehalf of the GRS-Odyssey GRB team,\n\nA. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C.\nFerrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nS. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of\nthe Swift-BAT team, and \n\nV. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi\nGBM team, report:\n\nWe have examined IPN data for the period 2014-02-26T09:05:00 to\n2014-02-26T10:18:00, when the optical transient source iPTF14yb was\ndiscovered (Cenko et al. GCN 15883).  During this time, Konus, Swift,\nINTEGRAL, RHESSI, Odyssey, and MESSENGER were operating and returning\ndata, although in the presence of increased solar activity.  Suzaku was\noff.  We have identified one event, at 2014-02-26T10:02:57 (36177 s),\nobserved by Odyssey, INTEGRAL (SPI-ACS) and Konus (in the waiting\nmode), whose duration is ~15 s, and whose localization is consistent\nwith iPTF14yb.  Specifically, the Odyssey-INTEGRAL triangulation\nannulus is centered at RA, Dec = 206.305 degrees (13 h 45 m 13.2 s),\n-7.925 degrees (-7 o 55 ' 29 \"), with radius 27.577 +/- 0.607 degrees\n(3 sigma).  iPTF14yb lies 0.157 degrees from the center line of the\nannulus.  The probability that the transient lies within the annulus by\nchance is roughly 0.005.  At the time of this event, the optical\ntransient was below the horizon for Swift, and no emission consistent\nwith a GRB was seen in the data. Fermi was in the SAA.  The RHESSI and\nMESSENGER backgrounds were high and variable due to solar activity,\nmaking the identification of this burst uncertain in their data.\n\nIf this is indeed the GRB counterpart to iPTF14yb, this would appear to\nbe the first GRB to be discovered on the basis of its optical\ncounterpart.\n\nThis triangulation can be improved.  Detailed spectral and temporal\ninformation on this burst will be presented in a forthcoming GCN\nCircular.",
  "circularId": 15888,
  "createdOn": 1393547144000,
  "email": "khurley@ssl.berkeley.edu",
  "subject": "IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb",
  "submitter": "Kevin Hurley at UCBerkeley/SSL  <khurley@ssl.berkeley.edu>",
  "eventId": "GRB 140226A"
}