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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"

647 results found.

  1. Konus-Wind observation of GRB 060124
  2. GRB 060117: PROMPT Observations
  3. GRB 060108: Refined XRT analysis
  4. GRB 051221B: Optical Observations with Kuiper 1.54m
  5. GRB 051221B: Refined analysis of the Swift-BAT burst
  6. Konus-Wind observation of GRB 051028
  7. Konus-Wind observation of GRB 051022
  8. GRB 050906, summary of radio observations
  9. GRB 051001: Swift Detection of a Burst
  10. GRB050922C: optical observation
  11. GRB 050827: Swift-BAT refined analysis
  12. GRB 050730: WSRT Radio Observations
  13. GRB050801: Swift-BAT detection of a burst
  14. GRB 050509b: Swift XRT Position
  15. IPN Summary of SGR1806-20 Activity in 2004
  16. IPN triangulation of GRB030413 (small error box)
  17. IPN triangulation of GRB021211B (two large error boxes)
  18. IPN triangulation of GRB020904
  19. IPN triangulation of GRB020715 (=GRB150702)
  20. IPN triangulation of GRB150702
  21. GRB020124 optical observations with RIBOTS/RIMOTS
  22. XRF/GRB 011030: Detection of the Probable Host Galaxy
  23. GRB 011030: TNG K-band observation
  24. XRF011030: J and K band observations
  25. XRF011030: Chandra Observations
  26. GRB 011030: K-band observations
  27. The X-ray Flash 011030 ('GRB 011030')
  28. GRB 011030, WSRT radio observations
  29. GRB011030 - further refinement WFC position
  30. GRB 011030, Radio observations
  31. GRB010220, Radio and Optical Observations
  32. GRB010213 (HETE) TAROT observations
  33. GRB 001109: deep JHK upper limits
  34. GRB 000301A, Radio Observations
  35. BEPPOSAX GRBM Localization of GRB991226
  36. IPN localization of GRB991226
  37. Optical Observations of GRB990627
  38. BeppoSAX NFI Observation of GRB980425
  39. GRB980425 Optical Follow-up
  40. GRB980425: X-ray revised positions
  41. GRB970519, optical follow-up at Schmidt Calern
  42. BSAX Observations of GRB980425 field
  43. GRB980425 BATSE observations
  44. GRB 980425 optical observations
  45. GRB980425: optical obs.
  46. GRB980425: Radio Observations
  47. GRB 980425 optical observations

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