Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

24 results found.

  1. GRB 120119A : LOAO Optical Observations
  2. GRB 120119A : SMA submm follow-up observation
  3. GRB 120119A: EVLA observations
  4. GRB 120119A: GRT detection of early afterglow
  5. GRB 120119A: optical upper limit
  6. GRB 120119A, Swift-BAT refined analysis
  7. GRB 120119A: TAROT La Silla observatory optical observations
  8. GRB120119A: REM NIR observations
  9. GRB 120119A: optical observations
  10. GRB 120119A: Swift/UVOT Observations
  11. GRB 120119A: SMARTS optical/IR afterglow observations
  12. GRB 120119A: Swift-XRT refined Analysis
  13. GRB 120119A: Enhanced Swift-XRT position
  14. GRB 120119A: Fermi GBM observation
  15. Konus-Wind observation of GRB 120119A
  16. GRB 120119A: optical observations
  17. GRB 120119A: MMT redshift confirmation
  18. GRB 120119A: Lick 3m Spectroscopy
  19. GRB 120119A: Gemini-S redshift
  20. GRB 120119A: PROMPT optical observation of early afterglow
  21. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  22. GRB 120119A: Liverpool Telescope afterglow detection
  23. GRB 120119A: PAIRITEL NIR Detection
  24. GRB 120119A: Swift detection of a burst with an optical counterpart

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