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 4561

GRB 060121: candidate optical counterpart
2006-01-22T12:55:46Z (18 years ago)
Daniele Malesani at SISSA-ISAS,Trieste,Italy <>
D. Malesani (SISSA/ISAS), L.A. Antonelli (INAF/OAR), S. Covino 
(INAF/OABr), E. Palazzi (INAF/IASF Bo), G. Andreuzzi (INAF/TNG), and G. 
Tessicini (INAF/TNG), report on behalf of a larger Italian collaboration:

We observed the field of GRB 060121 (Arimoto et al., GCN 4550;  
Prigozhin et al., GCN 4551; Boer et al., GCN 4552) at two epochs with 
the Italian TNG telescope located in the Canary Islands. Photometry was 
performed in the R-band starting on Jan 22.021 UT (Antonelli et al., GCN 
4556) and Jan 22.193 UT (2.1 and 6.2 h after the GRB, respectively). The 
second run provided images of lower quality, due to bad observing 

Inside the XRT error circle (Mangano et al., GCN 4560), we see a faint 
source which is detected in our first dataset but is not detected in the 
second epoch (which is, however, shallower).

The coordinates are (J2000):
 alpha = 09:09:51.93
 delta = +45:39:45.4
We estimate an error of about 0.5" (mainly due the low S/N of the object).

Even if at the moment we do not makeany claim of variability, we suggest 
this object may be the optical counterpart of GRB 060121.

This message can be cited.
Looking for U.S. government information and services? Visit