////////////////////////////////////////////////////////////////////////
TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3003
SUBJECT: GRB 050129: a weak long GRB detected with INTEGRAL
DATE:    05/01/31 09:01:13 GMT
FROM:    Diego Gotz at IASF-CNR  <diego@mi.iasf.cnr.it>

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.

////////////////////////////////////////////////////////////////////////
TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3008
SUBJECT: GRB 050129: Optical observations
DATE:    05/02/03 20:56:46 GMT
FROM:    Javier Gorosabel at LAEFF-INTA, Madrid  <jgu@laeff.esa.es>

J. Gorosabel, A.J. Castro-Tirado, A. de Ugarte Postigo,
M. Jelínek and V. Casanova (IAA-CSIC, Granada), report:

"We acquired RI-band images of the faint INTEGRAL 
 GRB 050129 error box (Gotz et al., GCN Circ. 3003) 
 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.