Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 625

GRB000326 Optical Observations
2000-04-06T11:28:14Z (24 years ago)
Holger Pedersen at Copenhagen U Obs <>
H. Pedersen, B. L. Jensen, J. Hjorth (U. of Copenhagen) and
J. Gorosabel (DSRI, Copenhagen) report:

"Further to the observations reported in GCN #620, we have 
used the ESO 2.2m + WFI to acquire R-band exposures, as 

2000 March 29.41 UTC, exp. 180 s, seeing 1.2" FWHM,
2000 March 30.40 UTC, exp. 600 s, seeing 1.0" FWHM.

The first of these covers a 8' x 16' area centered on 
the brightest of the three radio sources found by Frail 
(GCN #619). The second covers the full GRB error box 
(Hurley et al., GCN #618).

Inspection of the new data reveals that the optical object 
seen at the position of the said radio source is extended 
and of same brightness, as when first detected, on 27.41 UT. 
We conclude, in agreement with Frail (GCN #622), that it 
is not a likely afterglow. 

Comparison between the March 27.41 (GCN #620) and the 
March 30.40 exposures has revealed no variable object 
within the full error box. The limiting magnitude is R ~21.5. 

We cannot exclude that the GRB has occurred in the gaps 
between the WFI camera's eight CCD chips; these gaps 
amount to ~6 sq. arcmin. out of the ~50 sq. arcmin. 
size of the GRB error box."
Looking for U.S. government information and services? Visit