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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"

12115 results found.

  1. GRB051006: Refined analysis of the Swift-BAT burst
  2. GRB 051006: XRT position
  3. GRB051006: Swift detection of a burst
  4. GRB 051001: Swift XRT refined analysis
  5. GRB 051001: AAT infra-red observations
  6. GRB 051001: ROTSE-III Optical Limits
  7. GRB050922C: optical observation
  8. GRB050922C: UVES/VLT high resolution spectroscopy
  9. GRB050925: Swift/XRT limits
  10. GRB/SGR 050925: IR Observations
  11. GRB050925: Swift-BAT detection of a short burst
  12. GRB 050922B: Correction to BAT refined analysis, longer burst
  13. Konus-Wind observation of GRB 050922C
  14. GRB050922C: Optical Observations
  15. GRB 050922C: Swift XRT refined analysis
  16. GRB 050922C: optical obserations
  17. GRB 050922C: ROTSE-IIId Refined Analysis
  18. GRB 050922B: ROTSE-III Optical Limits
  19. Possible GRB 050922 detected by INTEGRAL
  20. GRB050820B: analysis of the XMM-Newton observation
  21. GRB050916: Swift/UVOT Upper Limits
  22. GRB 050918 - A long GRB detected by INTEGRAL
  23. Swift-BAT trigger 155535 is definitely not a GRB
  24. GRB 050916: XRT position
  25. GRB050916: Swift-BAT detection of a long weak burst
  26. GRB 050915B: XRT position
  27. GRB050915B: Swift-BAT detection of a long bright burst
  28. GRB 050915: Swift-BAT refined analysis
  29. GRB050915: P60 Optical Observations
  30. GRB 050915: ROTSE-III optical limits
  31. Swift is in normal operation
  32. GRB 050911: Swift-BAT refined analysis
  33. GRB 050911: z~0.16 cluster in the field
  34. GRB050911: Swift-BAT detection of a long burst
  35. GRB 050910a: TAROT early optical limits
  36. GRB 050906: Possible X-ray Counterpart
  37. GRB 050908: Swift-BAT refined analysis
  38. GRB 050908: Optical observations
  39. GRB 050908: Prompt PROMPT Observations
  40. Swift trigger 154073 is not a GRB
  41. GRB050904: CrAO optical observations
  42. GRB 050906: Swift-BAT refined analysis
  43. GRB 050906: Radio Observations
  44. GRB 050906: Bright galaxy in BAT error box
  45. GRB 050904: Swift/UVOT observations
  46. GRB 050904: early Swift XRT analysis results
  47. GRB 050827: P200 NIR Observations
  48. GRB050824, HETE-2 Observation
  49. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  50. GRB050824, I-band imaging
  51. GRB 050822: refined XRT analysis
  52. GRB 050824: XRT refined analysis and possible afterglow detection
  53. GRB 050824: ROTSE-III Optical Limits
  54. GRB050820A: RTT150 optical observations
  55. GRB 050822: Swift-BAT refined analysis
  56. GRB050820A: RTT150 optical observations
  57. GRB 050820a - corrections to GCN 3846
  58. GRB 050822: ROTSE-III Prompt Optical Limits
  59. GRB050820B: BAT-Swift detection of a bright GRB
  60. GRB 050820: High Resolution Spectroscopy from Keck
  61. GRB 050820: Swift detection of a GRB
  62. Swift-BAT trigger 150993 is not a GRB
  63. GRB 050815: ROTSE-III Optical Limits
  64. GRB050814: Fading red source
  65. GRB050814: P60 Optical Afterglow Candidate
  66. GRB 050814: XRT refined analysis
  67. GRB050814: Refined analysis of the Swift-BAT burst
  68. GRB 050814: Swift XRT Afterglow Localization
  69. GRB050813: RTT150 optical observations
  70. GRB 050813: KAIT optical limit
  71. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  72. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  73. Detection of an intermediate burst from SGR 1806-20 on August 8
  74. GRB 050807: ROTSE-III Optical Limits
  75. GRB050803, optical observations
  76. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  77. GRB 050803: RTT150 optical observations
  78. GRB050803: CrAO optical observations, possible OT candidate
  79. GRB 050803: Swift-BAT refined analysis
  80. GRB050803: MASTER further analys
  81. GRB 050803: early Swift XRT analysis results
  82. GCN GRB observation 050713A
  83. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  84. GRB050802: CrAO optical observations
  85. GRB 050802: Swift Gamma-ray Burst
  86. GRB 050801: Swift-BAT refined analysis
  87. GRB 050730, corrected photometry and break?
  88. GRB050730: Refined BAT analysis of the Swift-BAT burst
  89. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  90. GRB050730: Liverpool Telescope optical observations
  91. GRB 050730, optical candidate
  92. GRB050730: Swift-BAT detection of a weak burst
  93. GRB050713b: Maidanak optical observations
  94. GRB 050724: Chandra Observations of the X-ray Afterglow
  95. GRB 050724, SMARTS optical/IR afterglow observations
  96. GRB 050726, SMARTS optical/IR observations
  97. GRB 050724: J-band observations
  98. GRB 050724: SWIFT XRT refined position
  99. GRB050721A: Swift-BAT detection of a weak burst
  100. GRB 050712, Tautenburg optical afterglow observations

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