{
  "bibcode": "2005GCN..3424....1D",
  "body": "S. Dado (Technion), A. Dar (Technion) and A. De Rujula (CERN) report:\n \nThe leading scenarios for the production of short-duration GRBs involve\n(a) neutron-star mergers [1] (b) super flares from SGRs (GCN 2942 and [2])\n(c) gravitational collapse of neutron stars to strange-quark stars [3] (d)\ngravitational collapse of C/O white dwarfs to neutron stars (GCN 2174 and\n[4]). While scenarios (a), (b) are not associated with standard optical\nsupernovae (SNe), scenarios (c),(d) are expected to produce a standard \noptical SN. In particular, in scenario (d), a Type Ia SN is expected at the \nGRB location with standard rest-frame optical light curves peaking around \n20 days after burst with un-reddened absolute magnitudes [5]  Bmax ~ -19.47, \nVmax ~ - 19.42, Rmax ~ - 19.42 and Imax ~ - 19.06 (+\\-0.15).\n\n\nGRB050509B (GCN 3381) is the first well-localized short-duration (~ 30 ms)  \nGRB. A SN associated with a short GRB has never been looked for\nin such favorable conditions. \n\nIn the observer's frame the associated-SN expected un-reddened spectral\nenergy density at a frequency nu and a time t after burst is:\n\n    F(nu,t) = F'(nu',t') [1+z] [D(z')]^2 / ( [1+z'] [D(z)]^2] )  \n\nwhere z' is the redshift of a template Type Ia SN with spectral energy \ndensity F'; D(z) and D(z') are luminosity distances,  nu'=[(1+z)/(1+z')] nu \nand t'=[(1+z')/(1+z)] t. \n\nIf GRB050509B was produced in association with a Type Ia SN in the galaxy\ncluster NSC J123610+28590, at redshift z = 0.225 (GCN 3390), its rising\noptical light curve should be observable well before its peak around t =\n25 days after burst with Vmax ~ 20.43 +/- 0.15 (extinction in the host\ngalaxy is not included, but Galactic extinction in the direction of GRB\n050509B, Av~0.06 [6] is included).\n\nIn spite of the non-detections of an optical afterglow near the refined \nXRT error circle (GCN 3395) of GRB 050509B, a SN search in this direction, \nperhaps with telescopes such as Keck, VLT, Subaru and HST, may prove\nvery fruitful.\n\n[1]  Goodman, J., Dar, A., & Nussinov, S. 1987, ApJ, 314, L7 \n[2]  Hurley, K., et al. 2005, astro-ph/0502329\n[3]  Dar, A.   1999, A&AS, 138, 505 \n[4]  Dar, A. & De Rujula, A. 2004, Physics Reports, 405, 203 \n[5]  Germany, L. M., et al. 2004, A&A 415, 863 \n[6]  Schlegel, D. J.; Finkbeiner, D. P. & Davis, M. 1998, ApJ, 500, 525",
  "circularId": 3424,
  "createdOn": 1116155586000,
  "email": "arnon@physics.technion.ac.il",
  "subject": "GRB 050509B and short GRB-SN association? (corrected)",
  "submitter": "Arnon Dar at Technion-Israel Inst. of Tech  <arnon@physics.technion.ac.il>",
  "eventId": "GRB 050509B"
}