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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"

12124 results found.

  1. GRB 050502b: Optical limit
  2. GRB 051016B: refined analysis of the Swift/XRT data
  3. GRB 051016: LCO optical and near-IR imaging
  4. GRB050805A: Rc optical observations
  5. GRB 051008 - a low redshift low-luminosity burst?
  6. Konus-Wind observation of GRB 051008
  7. GRB 051008, optical observations
  8. GRB 051006: P60 Observations
  9. GRB 051006: XRT refined analysis
  10. GRB051006: Refined analysis of the Swift-BAT burst
  11. GRB 051006: XRT position
  12. GRB051006: Swift detection of a burst
  13. GRB 051001: Swift XRT refined analysis
  14. GRB 051001: AAT infra-red observations
  15. GRB 051001: ROTSE-III Optical Limits
  16. GRB050922C: optical observation
  17. GRB050922C: UVES/VLT high resolution spectroscopy
  18. GRB050925: Swift/XRT limits
  19. GRB/SGR 050925: IR Observations
  20. GRB050925: Swift-BAT detection of a short burst
  21. GRB 050922B: Correction to BAT refined analysis, longer burst
  22. Konus-Wind observation of GRB 050922C
  23. GRB050922C: Optical Observations
  24. GRB 050922C: Swift XRT refined analysis
  25. GRB 050922C: optical obserations
  26. GRB 050922C: ROTSE-IIId Refined Analysis
  27. GRB 050922B: ROTSE-III Optical Limits
  28. Possible GRB 050922 detected by INTEGRAL
  29. GRB050820B: analysis of the XMM-Newton observation
  30. GRB050916: Swift/UVOT Upper Limits
  31. GRB 050918 - A long GRB detected by INTEGRAL
  32. Swift-BAT trigger 155535 is definitely not a GRB
  33. GRB 050916: XRT position
  34. GRB050916: Swift-BAT detection of a long weak burst
  35. GRB 050915B: XRT position
  36. GRB050915B: Swift-BAT detection of a long bright burst
  37. GRB 050915: Swift-BAT refined analysis
  38. GRB050915: P60 Optical Observations
  39. GRB 050915: ROTSE-III optical limits
  40. Swift is in normal operation
  41. GRB 050911: Swift-BAT refined analysis
  42. GRB 050911: z~0.16 cluster in the field
  43. GRB050911: Swift-BAT detection of a long burst
  44. GRB 050910a: TAROT early optical limits
  45. GRB 050906: Possible X-ray Counterpart
  46. GRB 050908: Swift-BAT refined analysis
  47. GRB 050908: Optical observations
  48. GRB 050908: Prompt PROMPT Observations
  49. Swift trigger 154073 is not a GRB
  50. GRB050904: CrAO optical observations
  51. GRB 050906: Swift-BAT refined analysis
  52. GRB 050906: Radio Observations
  53. GRB 050906: Bright galaxy in BAT error box
  54. GRB 050904: Swift/UVOT observations
  55. GRB 050904: early Swift XRT analysis results
  56. GRB 050827: P200 NIR Observations
  57. GRB050824, HETE-2 Observation
  58. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  59. GRB050824, I-band imaging
  60. GRB 050822: refined XRT analysis
  61. GRB 050824: XRT refined analysis and possible afterglow detection
  62. GRB 050824: ROTSE-III Optical Limits
  63. GRB050820A: RTT150 optical observations
  64. GRB 050822: Swift-BAT refined analysis
  65. GRB050820A: RTT150 optical observations
  66. GRB 050820a - corrections to GCN 3846
  67. GRB 050822: ROTSE-III Prompt Optical Limits
  68. GRB050820B: BAT-Swift detection of a bright GRB
  69. GRB 050820: High Resolution Spectroscopy from Keck
  70. GRB 050820: Swift detection of a GRB
  71. Swift-BAT trigger 150993 is not a GRB
  72. GRB 050815: ROTSE-III Optical Limits
  73. GRB050814: Fading red source
  74. GRB050814: P60 Optical Afterglow Candidate
  75. GRB 050814: XRT refined analysis
  76. GRB050814: Refined analysis of the Swift-BAT burst
  77. GRB 050814: Swift XRT Afterglow Localization
  78. GRB050813: RTT150 optical observations
  79. GRB 050813: KAIT optical limit
  80. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  81. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  82. Detection of an intermediate burst from SGR 1806-20 on August 8
  83. GRB 050807: ROTSE-III Optical Limits
  84. GRB050803, optical observations
  85. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  86. GRB 050803: RTT150 optical observations
  87. GRB050803: CrAO optical observations, possible OT candidate
  88. GRB 050803: Swift-BAT refined analysis
  89. GRB050803: MASTER further analys
  90. GRB 050803: early Swift XRT analysis results
  91. GCN GRB observation 050713A
  92. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  93. GRB050802: CrAO optical observations
  94. GRB 050802: Swift Gamma-ray Burst
  95. GRB 050801: Swift-BAT refined analysis
  96. GRB 050730, corrected photometry and break?
  97. GRB050730: Refined BAT analysis of the Swift-BAT burst
  98. GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
  99. GRB050730: Liverpool Telescope optical observations
  100. GRB 050730, optical candidate

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