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"

24753 results found.

  1. GRB980613 observations from Palomar
  2. GRB 980613 optical/IR obs.
  3. GRB980613 Near Infra-Red Observations
  4. GRB971214 Secondary Standards
  5. GRB980519 Secondary Standards
  6. BATSE on-board GRB trigger change
  7. GRB 980519 Optical Observations
  8. GRB 980519
  9. GRB980519 optical observations
  10. GRB 980519 Optical Observations
  11. GRB980519 BATSE Observations
  12. GRB980519 Optical Observations
  13. GRB980519 Optical Observations
  14. GRB 980519 Optical Observations
  15. GRB980515, BeppoSAX IAUC to be submitted
  16. BSAX Observations of GRB980425 field
  17. IPN web site of GRBs
  18. GRB980425 BATSE observations
  19. SAX J0840.7+2248 Optical Observations
  20. GRB980425: optical obs.
  21. GRB980425: Radio Observations
  22. report on BSAX observations of GRB980425
  23. GRB 980329 ROSAT observation
  24. GRB980326 X-ray Observations
  25. GRB980326, optical observations
  26. GRB980326, optical observations
  27. GRB980329, Fading IR counterpart to radio source
  28. GRB980329 Keck K-band observations
  29. GRB980329 sub-millimeter observations
  30. GRB980329 optical observations
  31. GRB980329 near-IR observations
  32. GRB980329 near-IR observations
  33. GRB980326 optical observations
  34. GRB980329 optical observations
  35. GRB980329 VLA observations
  36. GRB980329 optical observations
  37. GRB980329 optical observations
  38. GRB980326 optical observations
  39. GRB980326 optical observations
  40. Optical Observations of GRB 970508
  41. Near-IR follow-up on GRB 971227
  42. Optical Observations of the GRB 971227 field
  43. Optical Observations on GRB 971227
  44. GRB971227: Plaskett R-band observations
  45. GRB 971227: Optical clarifications
  46. GRB971227: Further CAHA R-band images
  47. GRB971227: LOTIS observations
  48. GRB971214: Optical Observations and Calibrations
  49. GRB 971214: Optical Observations
  50. Radio Observations of GRB 971214 at the VLA
  51. GRB 971024: Refined analysis by USNOFS Observations
  52. GRB 971024: KPNO Optical Observations
  53. 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