GRB 050709.94 :
 

Finding charts for GRB 050709.94.
Left: R:12x600s image taken at July 11.3, 2005 UT, (FWHM~0.7").
Right: R:17x600s image taken at July 12.3, 2005 UT, (FWHM~1.0").
The WCS-solution is calibrated to 13 nearby 2MASS-stars, with an uncertainity of +-0.25".  
 

  

NUMBER:  3589
SUBJECT: GRB050709.94 : Chandra source optical counterpart
DATE:

B. L. Jensen, U. G. Jørgensen, J. Hjorth, J. P. U. Fynbo, D. Watson, J. M. Castro Cerón, K. Pedersen, H. Pedersen, J. Sollerman (DARK Cosmology Centre, Niels Bohr Institute)

"Using the Danish 1.54m+DFOSC (La Silla), we have obtained R-band images of the field of the SXC-source associated with GRB 050709.94 (Butler et al., GCN#3570) for two nights (July 11.3 and 12.3 UT) under good conditions (0.7" and 1.0" seeing, respectively). At the location of the Chandra source (Fox et al., GCN#3585), we clearly detect the object present on the DSS.

In the image with the best seeing (the first night), this object resolves into two sources separated by about 1". The 0.5" Chandra error-circle covers the fainter, eastern-most, of these two sources.

In the image from the second night, the objects are not clearly resolved. Aperture photometry of both objects together in the two epochs (at t+33h and t+56h) do not indicate significant R-band variability.

Images of the objects are shown at:

http://www.astro.ku.dk/~brian_j/grb/grb050709.94/ "

 

Last updated on July 13, 2005, by Brian Lindgren Jensen