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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"

156 results found.

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

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