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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"

152 results found.

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

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