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"

32557 results found.

  1. GRB 980519 Optical Observations
  2. GRB980519 optical observations
  3. GRB980519 I-band observations
  4. GRB 980519
  5. GRB980519 optical observations
  6. GRB 980519 Optical Observations
  7. GRB980519 BATSE Observations
  8. GRB970519, optical follow-up at Schmidt Calern
  9. GRB980519 optical observations
  10. GRB980519 Optical Observations
  11. GRB980519 Optical Observations
  12. GRB980519 IPN POSITION
  13. GRB980519 Optical Observations
  14. GRB 980519 Optical Observations
  15. GRB980519 optical observations
  16. GRB980515, BeppoSAX IAUC to be submitted
  17. GRB980519, BeppoSAX-WFC updated position
  18. GRB 980425 Radio Light Curve
  19. GRB 980425 Brightness Temperature
  20. BSAX Observations of GRB980425 field
  21. IPN web site of GRBs
  22. GRB980425 BATSE observations
  23. SAX J0840.7+2248 Optical Observations
  24. GRB 980425 optical observations
  25. GRB980425: optical obs.
  26. GRB980425: Radio Observations
  27. GRB 980425 optical observations
  28. GRB980326, optical observations
  29. GRB980326, optical observations
  30. GRB980329, Fading IR counterpart to radio source
  31. GRByymmdd, Announcement of automation
  32. GRB980326 IPN annulus
  33. GRB980329
  34. GRB980329 Keck K-band observations
  35. GRB980329 sub-millimeter observations
  36. GRB980329 IPN annulus
  37. GRB980329 optical observations
  38. GRB980329 near-IR observations
  39. GRB980329 optical observations
  40. GRB980326 optical observations
  41. GRB980326 optical observations
  42. GRB970508 SAO RAS optical observations
  43. GRB 971214: Redshift from Keck Observations
  44. Near-IR follow-up on GRB 971227
  45. GRB971214: Keck R & I-band Observations
  46. GRB 971227: Optical Observations
  47. Optical Observations of the GRB 971227 field
  48. GRB971227: Plaskett R-band observations
  49. GRB 971227: Optical clarifications
  50. GRB971227: LOTIS observations
  51. GRB971214: Optical Observations and Calibrations
  52. Optical Observations of GRB 971214 at Keck
  53. GRB 971024: Refined analysis by USNOFS Observations
  54. GRB 971024: USNO Observations
  55. GRB 970925: BATSE Localization
  56. IRAS 18119-1342 and the possible new SGR
  57. 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