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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"

646 results found.

  1. GRB 060522: Swift detection of a burst with possible optical afterglow
  2. GRB 060306: Swift-BAT refined analysis
  3. Konus-Wind observation of bright hard GRB 060213
  4. GRB 060211B: Swift/BAT refined analysis
  5. GRB 060210: Refined analysis of the Swift-BAT burst
  6. GRB 060202: Refined analysis of the Swift-BAT burst
  7. Konus-Wind observation of GRB 060124
  8. GRB 060117: PROMPT Observations
  9. GRB 060108: Refined XRT analysis
  10. GRB 051221B: Optical Observations with Kuiper 1.54m
  11. GRB 051221B: Refined analysis of the Swift-BAT burst
  12. Konus-Wind observation of GRB 051028
  13. Konus-Wind observation of GRB 051022
  14. GRB 050906, summary of radio observations
  15. GRB 051001: Swift Detection of a Burst
  16. GRB050922C: optical observation
  17. GRB 050827: Swift-BAT refined analysis
  18. GRB 050730: WSRT Radio Observations
  19. GRB050801: Swift-BAT detection of a burst
  20. GRB 050509b: Swift XRT Position
  21. IBAS GRB Alerts 1978-1980
  22. GRB040903 - A XRF?
  23. IPN Summary of SGR1806-20 Activity in 2004
  24. IPN triangulation of GRB030413 (small error box)
  25. IPN triangulation of GRB021211B (two large error boxes)
  26. IPN triangulation of GRB020904
  27. IPN triangulation of GRB020715 (=GRB150702)
  28. IPN triangulation of GRB150702
  29. GRB020124 optical observations with RIBOTS/RIMOTS
  30. GRB010220, Radio and Optical Observations
  31. GRB010213 (HETE) TAROT observations
  32. GRB 001109: deep JHK upper limits
  33. GRB 000301A, Radio Observations
  34. BEPPOSAX GRBM Localization of GRB991226
  35. IPN localization of GRB991226
  36. Optical Observations of GRB990627
  37. BeppoSAX NFI Observation of GRB980425
  38. GRB980425 Optical Follow-up
  39. GRB980425: X-ray revised positions
  40. GRB970519, optical follow-up at Schmidt Calern
  41. BSAX Observations of GRB980425 field
  42. GRB980425 BATSE observations
  43. GRB 980425 optical observations
  44. GRB980425: optical obs.
  45. GRB980425: Radio Observations
  46. GRB 980425 optical observations

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