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"

25 results found.

  1. GRB 130907A: Maidanak optical observations
  2. GRB 130907A: Continued RATIR Optical and NIR Observations
  3. GRB 130907A: MASTER refined analysis
  4. GRB 130907A: AMI radio detection
  5. GRB 130907A: Continued RATIR Optical and NIR Observations
  6. GRB 130907A: RATIR Optical and NIR Observations
  7. GRB 130907A: WSRT radio detection
  8. GRB 130907A: Further Swift-BAT refined analysis
  9. GRB 130907A: INTEGRAL/SPI-ACS light curve
  10. Konus-Wind observation of GRB 130907A
  11. GRB 130907A, Swift-BAT refined analysis
  12. GRB 130907A: T21 optical observations
  13. GRB 130907A: VLA detection
  14. GRB 130907A: Swift-XRT refined Analysis
  15. GRB 130907A: Enhanced Swift-XRT position
  16. Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
  17. GRB 120916A: Fermi-LAT detection of a burst
  18. GRB 130907A: Swift/UVOT Detection
  19. GRB 130907A: Early Tautenburg detections, red afterglow
  20. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  21. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  22. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  23. GRB 130907A: NOT redshift
  24. GRB 130907A: MASTER early OT observations
  25. GRB 130907A: 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