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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"

10364 results found.

  1. Refined BeppoSAX-WFC position of GRB990704
  2. GRB990704: BeppoSAX detection
  3. IPN error box for GRB990527
  4. Late Afterglows of GRBs 990510, 990123
  5. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  6. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  7. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  8. BeppoSAX: A new fast X-ray transient
  9. VLT spectrum of GRB990510
  10. GRB 990510: BATSE Observations
  11. GRB990510
  12. GRB 990506: BATSE Observations
  13. GRB 990506, optical observations
  14. GRB990506 Optical observations
  15. New IPN/RXTE error box for GRB990506
  16. GRB 970228: Redshift and properties of the host galaxy
  17. GRB980425 Optical observations of exponential decline at late time
  18. GRB990323 PRECISE IPN POSITION
  19. GRB990321 IPN TRIANGULATION
  20. GRB990308, Possible new SGR~0209+70
  21. GRB 981220, radio observations
  22. BATSE Flight Anomaly
  23. Optical Observations of GRB990217
  24. GRB 990123: Continued Radio Observations
  25. Search for Potential Images of GRB 990123
  26. "GRB 990123: New BV Observations"
  27. GRB 990123: BATSE Observations
  28. GRB990123 Optical Observation
  29. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  30. GRB 980613: Spectroscopy of the host galaxy
  31. GRB 981226 optical observations
  32. GRB981226, BeppoSAX-NFI follow-up
  33. GRB 981220: BeppoSAX/GRBM results
  34. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  35. GRB 980923 BATSE Observations
  36. GRB980703 optical photometry
  37. GRB 980703: BATSE Observations
  38. GRB980703: LOTIS observation at early times
  39. GRB980519 observation report
  40. GRB980703 optical followup
  41. Radio observations of SGRs
  42. GRB 980613: BATSE Observations
  43. Discovery of a new SGR source, SGR1627-41
  44. SGR1900+14
  45. SGR1900+14
  46. BATSE on-board GRB trigger change
  47. GRB 980519 Optical Observations
  48. GRB980519 BATSE Observations
  49. GRB970519, optical follow-up at Schmidt Calern
  50. GRB980519 optical observations
  51. GRB 980519 Optical Observations
  52. GRB980519, BeppoSAX-WFC updated position
  53. GRB980519, BeppoSAX-WFC position
  54. GRB 980425 Radio Light Curve
  55. GRB980425 BATSE observations
  56. GRB 980329 ROSAT observation
  57. GRB980329 optical observations
  58. GRB980329 optical observations
  59. GRB980329 optical observations
  60. GRB 971227: Optical Observations
  61. GRB971227: LOTIS observations
  62. GRB 971214: EUVE Observations
  63. GRB 971024: USNO Observations
  64. Possible new SGR from US Naval Observatory

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