GCN: The Gamma-ray Coordinates Network (TAN: Transient Astronomy Network)
Posted 06 Oct 2019.
GCN VOEvent cloud-computer 22.214.171.124 will be taken off-line at 15:00 UT (Tue, Oct 15, 2019) (11:00 EDT)
to upgrade the system (increased memory and disk space). The upgrade will take 15-20 minutes.
This upgrade will be done to 3 of the 9 GCN VOEvent server streams (the other 6 streams already have the bigger memories & disks).
This cloud computer was the first server in the GCN cloud. The 3 streams involved in the upgrade are:
126.96.36.199  ports: 8099 (public, version 1.1), 8092 (private, ver 1.1), & 8096 (private, ver 2.0).
In the cluster of GCN VOEvent servers, the redundant servers are
(pick the server that matches (a) your public-vs-private and (b) version number of your VOEvents you currently receive):
188.8.131.52 : port 8099, public, version 1.1, vetted & anonymous;
184.108.40.206 : port 8092, private, version 1.1, vetted only;
220.127.116.11 : port 8096, private, version 2.0, vetted only;
18.104.22.168 : port 8096, private, version 2.0, vetted only.
to which all vetted and anonymous sites can switch to if you can not tolerate a 15-20 min loss in coverage or
if the upgrade would end up taking longer than predicted.
After the end of the upgrade session (~15:20UT), please check this webpage for the status of the upgrade.
The GCN system distributes:
These two functions provide a one-stop shopping network for follow-up sites
and GRB and transient researchers.
Locations of GRBs and other Transients (the Notices) detected by spacecraft (most in real-time while the burst is still bursting and
others are that delayed due to telemetry down-link delays).
Reports of follow-up observations (the Circulars) made by
ground-based and space-based optical, radio, X-ray, TeV, and other particle observers.
The GCN system can be explored using the links above and below.
Invitation to subscribe to the Notices or Circulars here. unsubscribe here.
Make a modification to an existing Notices site configuration here.
Invitation to producers to incorporate your events into GCN here.
The physical GCN network. (Click to enlarge.)