GCN Circulars are now administered through the General Coordinates Network https://gcn.nasa.gov (effective April 17, 2023) The modernized GCN Circulars experience is part of the new GCN web site, where you can: Browse and search Circulars in our all-new archive. Sign up for and manage your own email subscriptions. Enroll yourself and your colleagues to submit Circulars with arXiv-style peer endorsements for new contributors. Submit Circulars with our new Web form, or continue to submit by email. This legacy GCN Classic Circulars service has been disabled. All legacy accounts are transferred to the new system. The legacy archive is frozen. Email submissions to the old address will be forwarded to the new system and processed normally. We encourage use of the new submission address. For questions, please contact the GCN Team. About the GCN/TAN A Brief Description There are two parts to the GRB Coordinates Network (GCN) (TAN: Transient Astronomy Network): (1) the real-time (and near real-time) distribution of GRB locations, images, spectra, & lightcurves, (in < 2sec inside GCN) detected by various spacecraft (Swift, Fermi, MAXI, INTEGRAL, IPN, etc), and (2) the distribution of follow-up observation reports submitted by the GRB/transient community. INVITATION to Join/Subscribe (Notices & Circulars) An open invitation for GRB researchers and institutions to join GCN/TAN. For people wishing to receive the GCN/TAN Notices, the required pieces of information to set up an entry in the "sites.cfg" file are listed. And for those individuals wanting to receive/submit GCN Circulars, those requirements are also listed. Scientific Motivation and General Background Information on GRBs The history and the importance of research into the nature of Gamma-Ray Bursts. GCN/TAN Sites and Links The current observing sites participating in the GCN/TAN system are listed. Links are provided when available. Who we are The people that built and run the GCN/TAN system. What's new    (22 Nov 19) Brief descriptions of new capabilities and operational changes within the GCN/TAN system. Technical Details A Full Description of the GCN/TAN System: The Basic System Description, The Various Sources of GRB/transient Locations, Distribution Methods, Coordinates Accuracy, Improvements Made to the System, Future Improvements to the System, Detailed Technical Descriptions and Specifications, Related Services and Activities, Real-time Aspects of these Webpages. Mission-Instrument Notices at-a-Glance Clicking the links will take you to the Description/Documentation pages and to the tables of archived past Notices. ACTIVE OLD   INACTIVE Description Notice Archive Description Notice Archive IPN   CGRO n/a KONUS table BeppoSAX table INTEGRAL GRBs table NEAR table INTEGRAL SPI-ACS table ALEXIS table Swift GRBs table HETE table Swift GND_ANALYSIS table MILAGRO table Swift BAT SubSubThresh table XTE-PCA,   -ASM table Swift BAT Monitor table Suzaku table AGILE GRBs table     AGILE MCAL table     Fermi GRBs table     Fermi GBM Subthresh table     Fermi LAT Monitor&Trans table     MAXI table     MOA table     SNEWS table     SK_SN table     CALET table     AMON Gold&Bronze table AMON EHE table AMON HAWC table AMON HESE table AMON NU_EM table     AMON CASCADE table     LIGO/Virgo table     GECAM table     Counterpart table     Coincidence table     SIMBAD-NED n/a

For questions or subscription changes, please contact the GCN Team. 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: Judith Racusin Responsible NASA Official: Judith Racusin NASA Privacy Statement, Disclaimer, and Accessibility Certification This file was last modified on Monday, 17-Apr-2023 13:39:27 EDT