Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

11755 results found.

  1. GRB 990510: BATSE Observations
  2. GRB990510
  3. GRB 990506: BATSE Observations
  4. GRB 990506, optical observations
  5. GRB990506 Optical observations
  6. New IPN/RXTE error box for GRB990506
  7. GRB 970228: Redshift and properties of the host galaxy
  8. GRB980425 Optical observations of exponential decline at late time
  9. GRB990323 PRECISE IPN POSITION
  10. GRB990321 IPN TRIANGULATION
  11. GRB990308, Possible new SGR~0209+70
  12. GRB 981220, radio observations
  13. BATSE Flight Anomaly
  14. Optical Observations of GRB990217
  15. GRB 990123: Continued Radio Observations
  16. Search for Potential Images of GRB 990123
  17. "GRB 990123: New BV Observations"
  18. GRB 990123: BATSE Observations
  19. GRB990123 Optical Observation
  20. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  21. GRB 980613: Spectroscopy of the host galaxy
  22. GRB 981226 optical observations
  23. GRB981226, BeppoSAX-NFI follow-up
  24. GRB 981220: BeppoSAX/GRBM results
  25. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  26. GRB 980923 BATSE Observations
  27. GRB980703 optical photometry
  28. GRB 980703: BATSE Observations
  29. GRB980703: LOTIS observation at early times
  30. GRB980519 observation report
  31. GRB980703 optical followup
  32. Radio observations of SGRs
  33. GRB 980613: BATSE Observations
  34. Discovery of a new SGR source, SGR1627-41
  35. SGR1900+14
  36. SGR1900+14
  37. BATSE on-board GRB trigger change
  38. GRB 980519 Optical Observations
  39. GRB980519 BATSE Observations
  40. GRB970519, optical follow-up at Schmidt Calern
  41. GRB980519 optical observations
  42. GRB 980519 Optical Observations
  43. GRB980519, BeppoSAX-WFC updated position
  44. GRB980519, BeppoSAX-WFC position
  45. GRB 980425 Radio Light Curve
  46. GRB980425 BATSE observations
  47. GRB 980329 ROSAT observation
  48. GRB980329 optical observations
  49. GRB980329 optical observations
  50. GRB980329 optical observations
  51. GRB 971227: Optical Observations
  52. GRB971227: LOTIS observations
  53. GRB 971214: EUVE Observations
  54. GRB 971024: USNO Observations
  55. Possible new SGR from US Naval Observatory

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