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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

21471 results found.

  1. GRB 060512: Swift-BAT Refined Analysis
  2. GRB 060505 - OT candidate + galaxy spectrum
  3. GRB060512 Name Correction: LT Afterglow detection
  4. GRB060512: Liverpool Telescope Afterglow detection
  5. GRB 060512: Swift detection of a burst with an optical afterglow
  6. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  7. GRB 060505: X-ray afterglow - Correction -
  8. GRB 060505: X-ray afterglow
  9. Konus-Wind observation of GRB 060510A
  10. GRB 060428a, SMARTS optical/IR afterglow detection
  11. GRB060510B: Swift XRT refined analysis
  12. GRB 060510B: Swift/UVOT Upper Limits
  13. GRB 060510A: Refined analysis of the Swift-BAT burst
  14. GRB 060510B: Swift-BAT Refined Analysis
  15. GRB060510A: XRT refined analysis
  16. GRB060510B : Faulkes North Telescope detection
  17. GRB 060510b: Gemini NIR observations
  18. GRB 060510B: Super-LOTIS Observations
  19. GRB 060510b: NIR observations
  20. GRB 060510B: MDM Observations and candidate OT
  21. GRB 060510B: Swift detection of a burst
  22. GRB 060510: Swift detection of a burst with optical transient
  23. GRB060507: optical afterglow detection
  24. GRB060502B: improvement in the XRT afterglow position
  25. GRB 060507: BART limit
  26. GRB 060507: Final Refined analysis of the Swift-BAT burst
  27. GRB 060507: Swift-BAT Refined Analysis
  28. GRB 060507: Swift/UVOT Upper Limits
  29. GRB 060507: Swift XRT Team Refined Analysis
  30. GRB 060507: MDM Optical Upper Limit
  31. GRB060507: Swift XRT position
  32. GRB 060507: Swift detection of a burst
  33. GRB060505: Swift/UVOT Observations
  34. GRB 060505: Swift XRT Team Refined Analysis
  35. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  36. GRB 060505: Swift XRT afterglow canditate position
  37. GRB 060502b: Second epoch Gemini observations
  38. GRB 060505: Swift-BAT detection of a weak burst
  39. GRB 060502B: optical observations
  40. GRB 060502B MDM Follow-up Observation
  41. GRB 060502b: Gemini imaging and spectroscopy
  42. GRB060502A, optical observation
  43. GRB 060502B: Swift/UVOT upper limits
  44. GRB 060502A: Swift/UVOT source detection
  45. GRB 060502B: MDM Optical Observation
  46. GRB 060502B: Refined analysis of the Swift-BAT short burst
  47. GRB060502B: Swift XRT Team refined analysis
  48. GRB060502B: correction to XRT position
  49. GRB 060501: P60 Observations and Candidate Retraction
  50. GRB 060502B: Xinglong optical observation
  51. GRB 060502B: MASTER optical observations
  52. GRB 060502B: Swift detection of a short burst
  53. GRB060502: Swift-XRT refined analysis
  54. GRB 060502: Swift-BAT refined analysis
  55. GRB 060502: APO Spectroscopic Observations
  56. GRB060501: Swift UVOT followup observations
  57. GRB060502: Super-LOTIS Observations
  58. GRB 060502: Swift detection of a burst with an optical counterpart
  59. GRB 060501: MDM Observations
  60. GRB060501: Super-LOTIS observations
  61. GRB060501: P60 imaging and afterglow candidate
  62. GRB 060501: Refined analysis of the Swift-BAT burst
  63. GRB060501: Swift XRT position
  64. GRB 060501: ROTSE-III Optical Limits
  65. GRB 060501: Swift detection of a burst
  66. GRB060428B: optical observation
  67. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  68. GRB 060428B: MDM Observations
  69. GRB060428B: Swift XRT Team refined analysis
  70. GRB 060427B: IPN localization of a short hard burst
  71. GRB 060428B: Refined analysis of the Swift-BAT burst
  72. GRB 060428B: KAIT observations
  73. GRB060428A: Swift/UVOT observations.
  74. GRB060428B, optical observation
  75. GRB 060428A: Refined analysis of the Swift-BAT burst
  76. GRB 060428b: Optical afterglow candidate
  77. GRB060428A: Swift XRT Team refined analysis
  78. GRB 060428B: Swift detection of a burst
  79. GRB 060427: NIR observations
  80. GRB 060428: Swift detection of a burst
  81. GRB 060427: NOT observations
  82. GRB 060427: Swift/UVOT upper limits.
  83. GRB 060427: Refined analysis of the Swift-BAT burst
  84. GRB060427: Swift XRT Team refined analysis
  85. GRB060418: Swift XRT Team Further Refined Analysis
  86. GRB 060427, optical observation
  87. GRB 060427: Swift detection of a burst
  88. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  89. GRB 060424: Refined analysis of the Swift-BAT burst
  90. GRB 060424: Swift detection of a burst
  91. Swift-BAT detection of Mrk 421
  92. GRB060421: Swift/UVOT observations
  93. GRB 060421: Swift-BAT Refined Analysis
  94. GRB 060421: Swift-XRT refined analysis
  95. GRB 060418: prediction of t_break
  96. Konus-Wind observation of GRB 060418
  97. GRB(?)060421:MASTER optical limit
  98. GRB(?)060421 : XRT position
  99. Possible GRB060421: BART limits
  100. GRB(?) 060421: Swift detection of a burst

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