Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32551 results found.

  1. GRB980519 BATSE Observations
  2. GRB970519, optical follow-up at Schmidt Calern
  3. GRB980519 optical observations
  4. GRB980519 Optical Observations
  5. GRB980519 Optical Observations
  6. GRB980519 IPN POSITION
  7. GRB980519 Optical Observations
  8. GRB 980519 Optical Observations
  9. GRB980519 optical observations
  10. GRB980515, BeppoSAX IAUC to be submitted
  11. GRB980519, BeppoSAX-WFC updated position
  12. GRB 980425 Radio Light Curve
  13. GRB 980425 Brightness Temperature
  14. BSAX Observations of GRB980425 field
  15. IPN web site of GRBs
  16. GRB980425 BATSE observations
  17. SAX J0840.7+2248 Optical Observations
  18. GRB 980425 optical observations
  19. GRB980425: optical obs.
  20. GRB980425: Radio Observations
  21. GRB 980425 optical observations
  22. GRB980326, optical observations
  23. GRB980326, optical observations
  24. GRB980329, Fading IR counterpart to radio source
  25. GRByymmdd, Announcement of automation
  26. GRB980326 IPN annulus
  27. GRB980329
  28. GRB980329 Keck K-band observations
  29. GRB980329 sub-millimeter observations
  30. GRB980329 IPN annulus
  31. GRB980329 optical observations
  32. GRB980329 near-IR observations
  33. GRB980329 optical observations
  34. GRB980326 optical observations
  35. GRB980326 optical observations
  36. GRB970508 SAO RAS optical observations
  37. GRB 971214: Redshift from Keck Observations
  38. Near-IR follow-up on GRB 971227
  39. GRB971214: Keck R & I-band Observations
  40. GRB 971227: Optical Observations
  41. Optical Observations of the GRB 971227 field
  42. GRB971227: Plaskett R-band observations
  43. GRB 971227: Optical clarifications
  44. GRB971227: LOTIS observations
  45. GRB971214: Optical Observations and Calibrations
  46. Optical Observations of GRB 971214 at Keck
  47. GRB 971024: Refined analysis by USNOFS Observations
  48. GRB 971024: USNO Observations
  49. GRB 970925: BATSE Localization
  50. IRAS 18119-1342 and the possible new SGR
  51. GRB 970228: Keck/LRIS Optical Observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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