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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"

26338 results found.

  1. GRB980326 IPN annulus
  2. GRB980329 Keck K-band observations
  3. GRB980329 sub-millimeter observations
  4. GRB980329 IPN annulus
  5. GRB980329 optical observations
  6. GRB980329 near-IR observations
  7. GRB980329 near-IR observations
  8. GRB980329 infrared observations
  9. GRB980329 optical observations
  10. GRB980326 optical observations
  11. GRB980329 optical observations
  12. GRB980329 optical observations
  13. GRB980329 optical observations
  14. GRB980326 optical observations
  15. GRB970508 SAO RAS optical observations
  16. Optical Observations of GRB 970508
  17. GRB 971214: Redshift from Keck Observations
  18. Near-IR follow-up on GRB 971227
  19. GRB971214: Keck R & I-band Observations
  20. GRB 971227: Optical Observations
  21. Optical Observations of the GRB 971227 field
  22. Optical Observations on GRB 971227
  23. GRB971227: Plaskett R-band observations
  24. GRB 971227: Optical clarifications
  25. GRB971227: Further CAHA R-band images
  26. GRB971227: LOTIS observations
  27. GRB 971227: CAHA R-band images
  28. GRB971214: Optical Observations and Calibrations
  29. GRB 971214: Apache Point Observatory Optical Observations
  30. GRB 971214: KPNO Optical Observations
  31. Optical Observations of GRB 971214 at Keck
  32. GRB 971214: Optical Observations
  33. Radio Observations of GRB 971214 at the VLA
  34. GRB 971024: Refined analysis by USNOFS Observations
  35. GRB 970925: BATSE Localization
  36. IRAS 18119-1342 and the possible new SGR
  37. RXTE Observations of SGR 1814-13
  38. GRB 970828: Palomar Observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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