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

ANNOUNCEMENT (22-Jun-2018):
UPDATE: Based on one data point out of over a 1000 copies distributed,
the recent Circular 22823 (redshift measurement on 180620B, z=1.1175)
there can be longer delivery delays out to 1 hour.
INITIAL: GSFC experienced a center-side internet problem (starting ~08:30 UT).
This affected email-based deliveries with 0.5-15 min delays.
And for socket-based deliveries there were no delays, but if a site broke its connection and tried to remake
there may have been problems.
As of 12:15 UT, things are getting better (much smaller delays).
.
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) 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 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.

System Status
System Status: Latest update: 22 Jun 2018 (UT)
What's New
What's New: Latest update: 17 Nov 2017 (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, scott@milkyway.gsfc.nasa.gov, (301)-286-3106
(or scottgcn@gmail.com if the Goddard email is down).

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

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    This file was last modified on Friday, 22-Jun-2018 12:09:36 EDT