Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. 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').
  1. GRByymmdd, Announcement of automation
  2. GRB980326 IPN annulus
  3. GRB980329
  4. GRB980329 Keck K-band observations
  5. GRB980329 sub-millimeter observations
  6. GRB980329 IPN annulus
  7. GRB980329 optical observations
  8. GRB980329 near-IR observations
  9. GRB980329 near-IR observations
  10. GRB980329 optical observations
  11. GRB980329 infrared observations
  12. GRB980329 optical observations
  13. GRB980326 optical observations
  14. GRB980329 optical observations
  15. GRB980329 VLA observations
  16. GRB980329 near IR observations
  17. GRB980329 optical observations
  18. GRB980329 optical observations
  19. GRB980329 optical observations
  20. GRB980326 optical observations
  21. GRB980326 optical observations
  22. GRB980326 optical observations
  23. GRB980326 optical observations
  24. GRB970508 SAO RAS optical observations
  25. Untitled
  26. Untitled
  27. Untitled
  28. Untitled
  29. Untitled
  30. Untitled
  31. Untitled
  32. Untitled
  33. Untitled
  34. Untitled
  35. Untitled
  36. Untitled
  37. Untitled
  38. Untitled
  39. Untitled
  40. Untitled
  41. Untitled
  42. Untitled
  43. Untitled
  44. Untitled
  45. Untitled
  46. Untitled
  47. Untitled
  48. Untitled
  49. Untitled
  50. Untitled
  51. Untitled
  52. Untitled
  53. Untitled
  54. Untitled
  55. Untitled
  56. Untitled
  57. Untitled
  58. Untitled
  59. Untitled

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