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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"

23713 results found.

  1. GRB060614: Swift-XRT refined analysis
  2. GRB 060604, optical observations
  3. GRB 060607B: Swift-BAT Refined Analysis
  4. GRB060602A: Swift/UVOT upper limits
  5. GRB 060607: Swift-BAT Refined Analysis
  6. GRB 060607: PROMPT Observations
  7. GRB 060522: PROMPT Optical Limits
  8. GRB 060605 BAT refined analysis
  9. GRB060602B : REM infrared observations
  10. GRB 060605: ROTSE-III Detection of Optical Counterpart
  11. GRB 060512: Keck Redshift
  12. GRB 060604: Swift-XRT Team refined analysis
  13. GRB 060604: BAT refined analysis
  14. GRB 060604A: ROTSE-III Optical Limits
  15. GRB 060602B: Swift-BAT Refined Analysis
  16. GRB 060602A: Swift-BAT Refined Analysis
  17. GRB 060526: Tautenburg Second Epoch Observations
  18. GRB 060526: Break in X-ray light curve
  19. GRB 060526: Multiple Optical Flares
  20. GRB060526: afterglow fitting and probable jet break
  21. GRB060502b: optical observations
  22. GRB060526: optical observations
  23. GRB 060526: SMARTS optical/IR afterglow observations
  24. GRB 060526: REM observations
  25. GRB 060526: Optical Flare
  26. GRB 060526: Refined analysis of the Swift-BAT burst
  27. GRB060526, optical observations
  28. GRB 060526: Swift/XRT Team refined analysis
  29. GRB 060526: Continued emission for the Swift burst
  30. GRB060505: VLT observations of the optical afterglow
  31. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  32. XMM-Newton observation of GRB060510b
  33. GRB060512: Late-Time P200 Observations
  34. GRB 060522: Swift/XRT Team refined analysis
  35. GRB 060522: Swift-BAT Refined Analysis
  36. GRB 060522: TNG optical observations
  37. GRB 060522: Swift detection of a burst with possible optical afterglow
  38. GRB 060515: NIR observation
  39. GRB 060516: Refined analysis of the Swift-BAT burst
  40. GRB 060512: TNG optical spectroscopy
  41. GRB060515: P200 NIR Observations
  42. GRB 060505 BAT refined analysis
  43. GRB 060515 BAT refined analysis
  44. GRB 060515: Super-LOTIS Observations
  45. GRB 060515: ROTSE-III Optical Limits
  46. GRB 060512: Swift-BAT Refined Analysis
  47. GRB060512 Name Correction: LT Afterglow detection
  48. GRB060512: Liverpool Telescope Afterglow detection
  49. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  50. GRB 060505: X-ray afterglow - Correction -
  51. GRB 060505: X-ray afterglow
  52. Konus-Wind observation of GRB 060510A
  53. GRB 060428a, SMARTS optical/IR afterglow detection
  54. GRB060510B: Swift XRT refined analysis
  55. GRB 060510B: Swift/UVOT Upper Limits
  56. GRB 060510A: Refined analysis of the Swift-BAT burst
  57. GRB 060510B: Swift-BAT Refined Analysis
  58. GRB060510B : Faulkes North Telescope detection
  59. GRB 060510B: Swift detection of a burst
  60. GRB060507: optical afterglow detection
  61. GRB 060507: Final Refined analysis of the Swift-BAT burst
  62. GRB 060507: Swift-BAT Refined Analysis
  63. GRB 060505: PROMPT Observations
  64. GRB 060507: Swift/UVOT Upper Limits
  65. GRB060507: Swift XRT position
  66. GRB 060429: Suzaku WAM observation
  67. GRB060505: Swift/UVOT Observations
  68. GRB 060505: Swift XRT afterglow canditate position
  69. GRB 060428B: spectroscopy
  70. GRB 060502B: optical observations
  71. GRB 060502B: AROMA refined photometric calibration
  72. GRB 060502b: Gemini imaging and spectroscopy
  73. GRB060502A, optical observation
  74. GRB 060502B: Swift/UVOT upper limits
  75. GRB 060502A: Swift/UVOT source detection
  76. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  77. GRB 060502B: AROMA optical observations
  78. GRB 060502B: Refined analysis of the Swift-BAT short burst
  79. Short GRB 060502B: Tautenburg Observation
  80. GRB 060502A: TTT Observations
  81. GRB 060501: P60 Observations and Candidate Retraction
  82. GRB 060502B: MASTER optical observations
  83. GRB 060502B: Swift detection of a short burst
  84. GRB 060502: Swift-BAT refined analysis
  85. GRB060501: P60 imaging and afterglow candidate
  86. GRB 060501: Refined analysis of the Swift-BAT burst
  87. GRB060501: Swift XRT position
  88. GRB 060501: ROTSE-III Optical Limits
  89. GRB 060428A: PROMPT Observations
  90. GRB 060427B: MASTER optical observations
  91. GRB060428B: Swift XRT Team refined analysis
  92. GRB 060427B: IPN localization of a short hard burst
  93. GRB 060428B: Refined analysis of the Swift-BAT burst
  94. GRB 060428B: KAIT observations
  95. GRB060425:MASTER optical limit
  96. GRB 051117A: Bright host galaxy not confirmed
  97. GRB060428B, optical observation
  98. GRB 060428A: Refined analysis of the Swift-BAT burst
  99. GRB060427:MASTER optical limit
  100. GRB 060428b: Optical afterglow candidate

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