Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 222

GRB990123 IPN annulus
1999-01-25T18:10:30Z (25 years ago)
Kevin Hurley at UCBerkeley/SSL <>
K. Hurley, on behalf of the IPN3 team, and M. Feroci, on
behalf of the BeppoSAX GRBM team, report: 

We have obtained a preliminary IPN3 annulus for GRB990123
by triangulation using Ulysses and the BeppoSAX GRBM.  The
annulus is centered at RA(2000)=163.7197 degrees, Dec(2000)=
-9.4661 degrees, with a radius of 81.3372 degrees and a
3 sigma width of 2.67 arcminutes.  This annulus reduces slightly
both the 2' radius SAX WFC error circle (BeppoSAX MAIL 99/2)
as well as the 1.5' MECS error circle (BeppoSAX MAIL 99/3),
and contains the optical transient (Bloom et al., GCN 206).
An image may be found at
Considerable reduction of the annulus width is possible.
This report was delayed due to the fact that Ulysses data
are not processed and distributed over the weekend.

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