Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

632 results found.

  1. GRB 051001: Swift Detection of a Burst
  2. GRB050922C: optical observation
  3. GRB 050827: Swift-BAT refined analysis
  4. GRB 050730: WSRT Radio Observations
  5. GRB050801: Swift-BAT detection of a burst
  6. GRB 050509b: Swift XRT Position
  7. IBAS GRB Alerts 1978-1980
  8. GRB040903 - A XRF?
  9. IPN Summary of SGR1806-20 Activity in 2004
  10. IPN triangulation of GRB030413 (small error box)
  11. IPN triangulation of GRB021211B (two large error boxes)
  12. IPN triangulation of GRB020904
  13. IPN triangulation of GRB020715 (=GRB150702)
  14. IPN triangulation of GRB150702
  15. GRB020124 optical observations with RIBOTS/RIMOTS
  16. GRB010220, Radio and Optical Observations
  17. GRB010213 (HETE) TAROT observations
  18. GRB 001109: deep JHK upper limits
  19. GRB 000301A, Radio Observations
  20. BEPPOSAX GRBM Localization of GRB991226
  21. IPN localization of GRB991226
  22. Optical Observations of GRB990627
  23. BeppoSAX NFI Observation of GRB980425
  24. GRB980425 Optical Follow-up
  25. GRB980425: X-ray revised positions
  26. GRB970519, optical follow-up at Schmidt Calern
  27. BSAX Observations of GRB980425 field
  28. GRB980425 BATSE observations
  29. GRB 980425 optical observations
  30. GRB980425: optical obs.
  31. GRB980425: Radio Observations
  32. GRB 980425 optical observations

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov