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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"

154 results found.

  1. GRB 991217
  2. SAX J2303.2+0015: an x-ray/GRB?
  3. BeppoSAX NFI Observation of GRB991106
  4. GRB 991105: BATSE Observations
  5. BeppoSAX refined position for GRB991106
  6. GRB991105: SAX-GRBM/-WFC detection
  7. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  8. GRB ALERT: GRB991105
  9. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  10. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  11. GRB990806 BeppoSAX follow up
  12. GRB 990712
  13. Infrared and Optical Observations of GRB990705
  14. GRB990704: SAX-NFI results summary
  15. GRB 990704 X-ray Observations
  16. GRB990705: Intriguing Positional Coincidences
  17. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  18. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  19. Optical report on X-ray/GRB transient
  20. BeppoSAX: A new fast X-ray transient
  21. GRB990123, Probability of gravitational lensing
  22. On the Lensing Interpretation of GRB 990123
  23. Search for Potential Images of GRB 990123
  24. GRB 990123: BATSE Observations
  25. GRB990123 IPN annulus
  26. GRB990123, refined SAX-WFC position
  27. GRB 981226 Optical Observations
  28. GRB981226 BeppoSAX follow up
  29. GRB980425: X-ray revised positions
  30. GRB980519, Optical Observations
  31. GRB980703, Host galaxy multicolor photometry
  32. GRB 980703 (NFI observations)
  33. BeppoSAX NFI observations of GRB 980703
  34. GRB980703
  35. GRB980613, optical observations
  36. GRB 980613 Optical Observations
  37. GRB980613 BeppoSAX-NFI follow up
  38. GRB980613, BeppoSAX WFC positions
  39. GRB980519 IPN POSITION
  40. GRB980515: SAX-WFC updated position
  41. BSAX Observations of GRB980425 field
  42. GRB980425 BATSE observations
  43. SAX J0840.7+2248 Optical Observations
  44. report on BSAX observations of GRB980425
  45. GRB980329 IPN annulus
  46. GRB980329 near-IR observations
  47. GRB980329 near-IR observations
  48. GRB980329 near IR observations
  49. GRB980329 optical observations
  50. Optical Observations for GRB 971227
  51. GRB 971227: Optical observations
  52. GRB971214: Optical Observations and Calibrations
  53. Optical Observations of GRB 971214 at Keck
  54. GRB 971214: USNOFS Observations Summary

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