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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"

23709 results found.

  1. GRB 060115: Swift detection of a burst
  2. GRB 060114: refined position
  3. GRB 060114: A long GRB detected by INTEGRAL
  4. GRB060114: Faulkes North observation
  5. GRB 060108: Evidence for an XRT Position Offset
  6. GRB 060111B: Refined analysis of the Swift-BAT burst
  7. GRB 060111B: Gualba observatory limit
  8. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  9. GRB 060111: Swift-BAT Refined Analysis
  10. GRB060111.2:_MASTER optical limit
  11. GRB 060111: ROTSE-III Optical Limits
  12. GRB 060110: Swift-BAT refined analysis
  13. GRB 060109: Swift-BAT refined analysis
  14. GRB 060108: z-band imaging from Gemini-North
  15. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  16. GRB 060110: Correction
  17. GRB060108: Faulkes Telescope observation
  18. GRB 060108: Refined analysis of the Swift-BAT burst
  19. GRB060108: Swift detection of its 100th GRB
  20. Konus-Wind observation of GRB 060105
  21. GRB 060105: Mitsume optical observations
  22. GRB 060105: BAT refined analysis
  23. Swift-BAT trigger 175653 is not an astrophysical source
  24. Swift-BAT trigger 175653 is probably not a GRB
  25. GRB 060102: Swift-BAT refined analysis
  26. Time Correction to GRB 060102
  27. GRB 060102: Swift-BAT detection of a burst
  28. GRB051211B: optical observations
  29. GRB 051227: Magellan r'-band Imaging/Astrometry
  30. GRB 051227: XRT refined analysis
  31. GRB 051227: Swift detection of a burst
  32. GRB051117B: optical observation
  33. IBAS_alert n. 2719 : not a real GRB
  34. Konus-Wind observation of GRB 051221A
  35. GRB051221A: Suzaku WAM observation of the prompt emission
  36. GRB 051221A: MDM Optical Observations
  37. GRB051016: analysis of the XMM-Newton observation
  38. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  39. GRB 051221B: ROTSE-III Optical Limits
  40. Possible GRB 051221B: MDM Optical Detection
  41. GRB 051221B: BOOTES optical observations.
  42. Swift-BAT detection of a possible burst
  43. GRB 051221: Improved astrometry of the IR counterpart
  44. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  45. GRB051211A (=H3979): Refined Analysis
  46. GRB051211A: possible optical candidate
  47. GRB 051215: near-infrared observations
  48. GRB051105: optical observations
  49. GRB 051213: Swift-BAT refined analysis
  50. GRB051211B, RBO optical observations
  51. GRB051211B: Liverpool Telescope observation
  52. GRB 051211B: Swift XRT Observations
  53. GRB 051210: Magellan Imaging
  54. GRB 051211B: a long GRB detected by INTEGRAL
  55. GRB 051211: Swift XRT upper limit
  56. GRB 051211:IAC80 optical observations
  57. HETE SXC localization of GRB 051211 (=H3979)
  58. GRB 051210: Swift-BAT refined analysis of a short burst
  59. IPN observations of SGR1806-20
  60. Swift XRT positions
  61. An extraordinary long burst on December 3 from SGR1806-20
  62. IBAS Alert 2706 : not a real GRB
  63. Possible resuming of the SGR 1806-20 activity
  64. GRB051117B: optical observation
  65. GRB051111: optical observaion
  66. Swift-BAT trigger 165579 is not a GRB
  67. GRB 051127: Swift-BAT detection of a possible burst
  68. GRB051117B: Swift XRT refined analysis
  69. GRB051117b: No Swift/UVOT Detection
  70. GRB051111: Suzaku WAM observation of the prompt emission
  71. GRB051111: Rc optical observations
  72. GRB051008: Suzaku WAM observation of the prompt emission
  73. GRB 051117B: MARGE Optical Limits
  74. GRB 051117B,optical observation
  75. GRB 051117B: Optical observations
  76. GRB 051117B: ROTSE-III Optical Limits
  77. GRB 051114: Swift-BAT refined analysis
  78. GRB051109A optical observations
  79. GRB 051113: Swift-BAT refined analysis
  80. GRB051111: Swift/UVOT Observations
  81. GRB 051111: Swift-BAT refined analysis
  82. GRB 051109A Optical Observations
  83. GRB051111a: SARA Observations
  84. GRB 051111A: KAIT optical observations
  85. GRB051111: Super-LOTIS Early Detection
  86. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  87. Konus-Wind observation of GRB 051109A
  88. GRB 051109B: Swift-BAT refined analysis
  89. GRB 051109B: ROTSE-III Optical Limits
  90. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  91. GRB051109B: no UVOT source detected
  92. GRB 051109B Kiso optical follow-up observation
  93. GRB051105B: REM Optical observation
  94. GRB 051109: PROMPT Detections
  95. GRB051109: Early Super-LOTIS Detection
  96. GRB 051109: Swift-BAT refined analysis
  97. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  98. GRB 051109: ROTSE-III Detection of Possible Counterpart
  99. GRB051103: MASTER: OT limit and host galaxy candidates
  100. GRB051105A: Swift/UVOT Observations

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