GCN: The Gamma-ray Coordinates Network (TAN: Transient Astronomy Network) ANNOUNCEMENT (01-Jun-2017): The GCN Circulars for LIGO Event G268556/GW170104 has been added to these public web pages. The GCN system distributes: 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. 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. About GCN/TAN provides a number of 'Introductions' from different points of view. 'Technical Details' (found on the About GCN/TAN page) describes the various services and products of GCN/TAN and how they are generated. 'Burst Data Archives' are available under Burst & Transient Information, which record the inputs and outputs of GCN/TAN automatically and are updated in real-time. You can also Search for past Bursts/Transients and webtext. 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: 23 Jun 2017 (UT) What's New What's New: Latest update: 01 Jun 2017 (UT) 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. Astronomy Questions? Ask a High Energy Astronomer. NASA-specific Questions? Try the NASA Homepage or start at the NASA site map. Curator: Teresa Sheets Responsible NASA Official: Phil Newman NASA Privacy Statement, Disclaimer, and Accessibility Certification This file was last modified on Friday, 23-Jun-2017 09:22:55 EDT