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"

26163 results found.

  1. GRB980613, optical observations
  2. GRB 980613: Optical transient and its host galaxy
  3. SGR1627-41, RXTE/ASM observations
  4. GRB 980613: Detection of the probable host galaxy
  5. Reduced error box of SGR 1627-41
  6. GRB 980613: BATSE Observations
  7. GRB 980613 Optical Observations
  8. GRB 980613 optical observations
  9. Discovery of a new SGR source, SGR1627-41
  10. GRB980613 Optical Observations
  11. GRB980613 observations from Palomar
  12. GRB 980613 optical/IR obs.
  13. GRB980613 Near Infra-Red Observations
  14. GRB971214 Secondary Standards
  15. GRB980519 Secondary Standards
  16. BATSE on-board GRB trigger change
  17. GRB 980519 Optical Observations
  18. GRB 980519
  19. GRB980519 optical observations
  20. GRB 980519 Optical Observations
  21. GRB980519 BATSE Observations
  22. GRB980519 Optical Observations
  23. GRB980519 Optical Observations
  24. GRB 980519 Optical Observations
  25. GRB980515, BeppoSAX IAUC to be submitted
  26. BSAX Observations of GRB980425 field
  27. IPN web site of GRBs
  28. GRB980425 BATSE observations
  29. SAX J0840.7+2248 Optical Observations
  30. GRB980425: optical obs.
  31. GRB980425: Radio Observations
  32. report on BSAX observations of GRB980425
  33. GRB 980329 ROSAT observation
  34. GRB980326 X-ray Observations
  35. GRB980326, optical observations
  36. GRB980326, optical observations
  37. GRB980329, Fading IR counterpart to radio source
  38. GRB980329 Keck K-band observations
  39. GRB980329 sub-millimeter observations
  40. GRB980329 optical observations
  41. GRB980329 near-IR observations
  42. GRB980329 near-IR observations
  43. GRB980326 optical observations
  44. GRB980329 optical observations
  45. GRB980329 VLA observations
  46. GRB980329 optical observations
  47. GRB980329 optical observations
  48. GRB980326 optical observations
  49. GRB980326 optical observations
  50. Optical Observations of GRB 970508
  51. Near-IR follow-up on GRB 971227
  52. Optical Observations of the GRB 971227 field
  53. Optical Observations on GRB 971227
  54. GRB971227: Plaskett R-band observations
  55. GRB 971227: Optical clarifications
  56. GRB971227: Further CAHA R-band images
  57. GRB971227: LOTIS observations
  58. GRB971214: Optical Observations and Calibrations
  59. GRB 971214: Optical Observations
  60. Radio Observations of GRB 971214 at the VLA
  61. GRB 971024: Refined analysis by USNOFS Observations
  62. GRB 971024: KPNO Optical Observations
  63. 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