Gamma-ray Burst 050129

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #3003
  D. Gotz, S. Mereghetti (IASF, Milano), A. Bodaghee, S. Shaw, M. Beck (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
  A 20 s long GRB has been detected by IBAS in IBIS/ISGRI data at 20:03:03 UT on Jan. 29. Due to its faintness no automatic IBAS Alert has been delivered. Its coordinates (J2000) are:

  RA:  252.7998 [degrees]
  DEC:  -3.0788 [degrees]
  

  with an uncertainty of 2.7 arcmin (90% c.l. radius).
  Its peak flux (20-200 keV, 1s integration time) is about 0.26 ph (3E-08 erg)/cmsq/s, which classifies it among the faintest INTEGRAL GRBs.
  This message can be cited.
• GCN notice #3008
  J. Gorosabel, A.J. Castro-Tirado, A. de Ugarte Postigo, M. Jel=EDnek and V. Casanova (IAA-CSIC, Granada), report:
  "We acquired RI-band images of the faint INTEGRAL=20 GRB 050129 error box (Gotz et al., GCN Circ. 3003)=20 with the 1.5m telescope at Observatorio de Sierra Nevada, as follows:

    Date Obs.     Exp. Time  Filter  Lim. Mag.
    Feb 2005 UT      (s)             (3 sigma)
    1.2197-1.2506   4x300      R       22.0
    1.2236-1.2662   7x300      I       21.5
   -------------------------------------------
    3.2078-3.2184   3x300      R       21.8
    3.2214-3.2462   7x300      I       21.6
  

  Comparison between both epoch co-added images did not reveal any variable source."
  This message can be cited.