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"

28058 results found.

  1. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  2. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  3. Optical Observations of GRB 981220
  4. GRB981220
  5. GRB 981220 Optical observations
  6. GRB 981226 Optical Observations
  7. GRB981226 Optical Observations
  8. GRB 981226
  9. GRB 981226 optical observations
  10. GRB981220 B, R and I band observations
  11. Optical Observations of GRB981226
  12. GRB 981220
  13. GRB 981220, radio observations
  14. GRB 980326/Host Galaxy
  15. GRB980425 Optical Follow-up
  16. GRB980703 Very Long Baseline Interferometry
  17. Optical Observations of the Host Galaxy of GRB 980519
  18. GRB980703 - BeppoSAX/GRBM detection
  19. GRB980703: Radio transient
  20. GRB 980703: Spectrum of the proposed optical counterpart
  21. RXTE Observation of GRB 980706
  22. GRB980703: LOTIS observation at early times
  23. GRB980613 Optical Observations
  24. GRB 980703 H-band Observations
  25. GRB980703 optical followup
  26. GRB 980613: Detection of the probable host galaxy
  27. GRB 980613 Optical Observations
  28. GRB 980613 optical observations
  29. GRB980613 Optical Observations
  30. GRB980613 BeppoSAX-NFI follow up
  31. GRB 980519 Optical Observations
  32. GRB 980519
  33. GRB980519 optical observations
  34. GRB980519 optical observations
  35. GRB980519 optical observations
  36. GRB980515, BeppoSAX IAUC to be submitted
  37. BSAX Observations of GRB980425 field
  38. SAX J0840.7+2248 Optical Observations
  39. GRB 980329 ROSAT observation
  40. GRB980326 X-ray Observations
  41. GRB980326, optical observations
  42. GRB980329, Fading IR counterpart to radio source
  43. GRB980329
  44. GRB980329 Keck K-band observations
  45. GRB980329 sub-millimeter observations
  46. GRB980329 near-IR observations
  47. GRB980329 optical observations
  48. GRB980329 optical observations
  49. GRB980329 VLA observations
  50. GRB980329 optical observations
  51. Near-IR follow-up on GRB 971227
  52. Optical Observations of the GRB 971227 field
  53. GRB971227: Plaskett R-band observations
  54. GRB 971227: Optical clarifications
  55. GRB971227: Further CAHA R-band images
  56. GRB 971227: CAHA R-band images
  57. GRB 971214: Redshift from Keck Optical Observations
  58. GRB 971214: KPNO 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