Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26051 results found.

  1. GRB980613 Near Infra-Red Observations
  2. GRB971214 Secondary Standards
  3. GRB980519 Secondary Standards
  4. BATSE on-board GRB trigger change
  5. GRB 980519 Optical Observations
  6. GRB 980519
  7. GRB980519 optical observations
  8. GRB 980519 Optical Observations
  9. GRB980519 BATSE Observations
  10. GRB980519 Optical Observations
  11. GRB980519 Optical Observations
  12. GRB 980519 Optical Observations
  13. GRB980515, BeppoSAX IAUC to be submitted
  14. BSAX Observations of GRB980425 field
  15. IPN web site of GRBs
  16. GRB980425 BATSE observations
  17. SAX J0840.7+2248 Optical Observations
  18. GRB980425: optical obs.
  19. GRB980425: Radio Observations
  20. report on BSAX observations of GRB980425
  21. GRB 980329 ROSAT observation
  22. GRB980326 X-ray Observations
  23. GRB980326, optical observations
  24. GRB980326, optical observations
  25. GRB980329, Fading IR counterpart to radio source
  26. GRB980329 Keck K-band observations
  27. GRB980329 sub-millimeter observations
  28. GRB980329 optical observations
  29. GRB980329 near-IR observations
  30. GRB980329 near-IR observations
  31. GRB980326 optical observations
  32. GRB980329 optical observations
  33. GRB980329 VLA observations
  34. GRB980329 optical observations
  35. GRB980329 optical observations
  36. GRB980326 optical observations
  37. GRB980326 optical observations
  38. Optical Observations of GRB 970508
  39. Near-IR follow-up on GRB 971227
  40. Optical Observations of the GRB 971227 field
  41. Optical Observations on GRB 971227
  42. GRB971227: Plaskett R-band observations
  43. GRB 971227: Optical clarifications
  44. GRB971227: Further CAHA R-band images
  45. GRB971227: LOTIS observations
  46. GRB971214: Optical Observations and Calibrations
  47. GRB 971214: Optical Observations
  48. Radio Observations of GRB 971214 at the VLA
  49. GRB 971024: Refined analysis by USNOFS Observations
  50. GRB 971024: KPNO Optical Observations
  51. GRB 970828: Palomar 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