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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"

159 results found.

  1. IPN error box for GRB991216
  2. GRB 991217 (SAX J2303.2+0015) Optical observations
  3. GRB991217/SAX J2303.2+0015, optical observations
  4. SAX J2303.2+0015 Optical observations
  5. GRB 991217 (SAX J2303.2+0015) Optical observations
  6. GRB 991217
  7. SAX J2303.2+0015: an x-ray/GRB?
  8. BeppoSAX NFI Observation of GRB991106
  9. GRB 991105: BATSE Observations
  10. BeppoSAX refined position for GRB991106
  11. GRB991105: SAX-GRBM/-WFC detection
  12. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  13. GRB ALERT: GRB991105
  14. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  15. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  16. GRB990806 BeppoSAX follow up
  17. GRB 990712
  18. Infrared and Optical Observations of GRB990705
  19. GRB990704: SAX-NFI results summary
  20. GRB 990704 X-ray Observations
  21. GRB990705: Intriguing Positional Coincidences
  22. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  23. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  24. Optical report on X-ray/GRB transient
  25. BeppoSAX: A new fast X-ray transient
  26. GRB990123, Probability of gravitational lensing
  27. On the Lensing Interpretation of GRB 990123
  28. Search for Potential Images of GRB 990123
  29. GRB 990123: BATSE Observations
  30. GRB990123 IPN annulus
  31. GRB990123, refined SAX-WFC position
  32. GRB 981226 Optical Observations
  33. GRB981226 BeppoSAX follow up
  34. GRB980425: X-ray revised positions
  35. GRB980519, Optical Observations
  36. GRB980703, Host galaxy multicolor photometry
  37. GRB 980703 (NFI observations)
  38. BeppoSAX NFI observations of GRB 980703
  39. GRB980703
  40. GRB980613, optical observations
  41. GRB 980613 Optical Observations
  42. GRB980613 BeppoSAX-NFI follow up
  43. GRB980613, BeppoSAX WFC positions
  44. GRB980519 IPN POSITION
  45. GRB980515: SAX-WFC updated position
  46. BSAX Observations of GRB980425 field
  47. GRB980425 BATSE observations
  48. SAX J0840.7+2248 Optical Observations
  49. report on BSAX observations of GRB980425
  50. GRB980329 IPN annulus
  51. GRB980329 near-IR observations
  52. GRB980329 near-IR observations
  53. GRB980329 near IR observations
  54. GRB980329 optical observations
  55. Optical Observations for GRB 971227
  56. GRB 971227: Optical observations
  57. GRB971214: Optical Observations and Calibrations
  58. Optical Observations of GRB 971214 at Keck
  59. GRB 971214: USNOFS Observations Summary

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