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GCN: The Gamma-ray Coordinates Network (TAN: Transient Astronomy Network)

ANNOUNCEMENT (12-Oct-2016):
During an malformed test session while porting GCN from the current/old machine to a new/fast machine,
a domain in a top-level email command caused the emails from a playback test (of a very old bust) on the new machine
to use the procmail lists for yesterday's burst on the old machine. My apologies for the spam.
Only email-based recipients were affected; the socket and voevent recipients did not receive this playback spam.

The GCN system distributes:
  1. 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).
  2. Reports of follow-up observations (the Circulars and the Reports) made by ground-based and space-based optical, radio, x-ray, TeV, and other particle observers.
These two functions provide a one-stop shopping network for follow-up sites and GRB and transient researchers.

The GCN system can be explored using the links above and below.

Invitation to subscribe to the GCN/TAN (Notices or Circulars) here.
Make a modification to an existing site configuration here.
Invitation to producers to incorporate your events into GCN here.

System Status
System Status: Latest update: 12 Oct 2016 (UT)
What's New
What's New: Latest update: 11 Sep 2016 (UT)

thumbnail of GCN physical network
The physical GCN network. (Click to enlarge.)

Latest Gamma-Ray Bursts

GCN Circulars Archive     Circs by Burst
GCN Reports Archive

The GCN/TAN contact is: Scott Barthelmy,, (301)-286-3106
(or if the Goddard email is down).

A service of the Astrophysics Science Division (ASD) at NASA's GSFC.

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  • Curator: Teresa Sheets
  • Responsible NASA Official: Phil Newman
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    This file was last modified on Wednesday, 12-Oct-2016 17:48:19 EDT