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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"

32740 results found.

  1. GRB 050714a: Refined XRT analysis and afterglow confirmation
  2. GRB050713a: Radio Observation
  3. Swift-BAT trigger 146731 is not a real GRB
  4. GRB 050712, Tautenburg optical afterglow observations
  5. GRB 050714B: VLT R-band observations
  6. GRB 050717: Additional LCO observations
  7. GRB050717
  8. GRB 050716; J-band observations
  9. Konus-Wind observation of GRB 050717
  10. GRB 050717: LCO near-IR observations
  11. Swift/UVOT Observations of GRB 050717
  12. GRB 050717: Swift-BAT refined analysis
  13. GRB 050717: Refined XRT analysis.
  14. GRB050712: optical limits
  15. GRB050717: Swift XRT position
  16. GRB 050716 - UKIRT identification of candidate afterglow
  17. Swift UVOT Observations of GRB 050716
  18. GRB 050716: Refined XRT analysis.
  19. GRB050716: Refined analysis of the Swift-BAT burst
  20. GRB 050716: Lulin B and R band optical observations
  21. GRB050716, optical observation
  22. GRB 050716: Optical Observations
  23. GRB050716: Faulkes North Telescope observation
  24. GRB050716: Correction to sign in XRT coordinate
  25. GRB050715: Refined analysis of the Swift-BAT burst
  26. Swift UVOT Observations of GRB 050714B
  27. Konus-Wind observation of GRB 050713A
  28. GRB 050714B: refined XRT analysis
  29. GRB 050713b: RTT150 optical observations
  30. GRB 050714B: candidate afterglow does not fade
  31. GRB050714B: Refined analysis of the Swift-BAT burst
  32. GRB 050714B: optical afterglow
  33. GRB 050709: optical afterglow candidate
  34. GRB 050714, R-band candidate
  35. GRB 050714: Swift XRT afterglow position
  36. GRB 050714, optical observations
  37. GRB 050714A: ROTSE-III Optical Limits
  38. GRB 050713A: XRT refined analysis
  39. GRB 050709: Spectroscopy
  40. GRB 050713A: RAPTOR detection of early optical emission
  41. GRB050713B :Swift/UVOT observations
  42. GRB050713b: XRT refined analysis
  43. GRB050712: TNG R-band observations
  44. GRB 050713B: Swift-BAT Refined Analysis
  45. Swift-BAT Trigger 145729 is not a GRB
  46. GRB 050713A: Swift/UVOT observation
  47. GRB 050713A : Swift-BAT Refined Analysis
  48. GRB050712: Swift UVOT Observation of Afterglow Emission
  49. GRB 050713A XMM-Newton observation
  50. GRB 050713b : Lulin R-band observations
  51. GRB050713B: Faulkes North Telescope observation
  52. RBO RI observations of GRB 050713A
  53. GRB050709 : Chandra source optical counterpart
  54. GRB050713: Liverpool Telescope prompt observations
  55. GRB 050712, optical observations
  56. GRB050709: Candidate X-ray Afterglow from Chandra
  57. GRB 050713: ARC NIR Detections and Identification of Fading
  58. GRB050713: possible I-band afterglow
  59. GRB 050713A: ROTSE-III Optical Limits
  60. GRB050712: XRT refined analysis
  61. GRB050709: Radio Observations
  62. GRB 050709: Swift UVOT and XRT observations
  63. GRB 050712: Swift-BAT Refined Analysis
  64. GRB050712: UVOT candidate optical counterpart
  65. GRB 050712: Swift XRT afterglow position
  66. GRB 050709: LCO40 Observations
  67. GRB050709, optical observations
  68. GRB050709: A Possible Short-Hard GRB Localized by HETE
  69. GRB 050525a: PROMPT VRcIc Detections
  70. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  71. GRB 050626 optical observations
  72. GRB 050701
  73. GRB 050701, optical observations
  74. GRB 050408: ARC 3.5-meter NIR Observations
  75. GRB 050701: Refined XRT analysis
  76. Swift UVOT observations of GRB 050701
  77. GRB050701: Swift-BAT Refined analysis
  78. GRB 050701: Swift XRT afterglow position
  79. GRB 050607, radio observations
  80. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  81. GRB 050626 - Correction to GCN 3552
  82. GRB 050626 - a long GRB detected with INTEGRAL
  83. GRB 050525A: Swift Late-Time Decay Rate
  84. GRB050525a: HST Observations
  85. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  86. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  87. XRF 050509c: Optical monitoring
  88. XRF050509c: Radio Detection
  89. GRB 050416(a): Host Galaxy Redshift Determination
  90. GRB 050607: MDM Observation
  91. GRB 050607: RTT150 optical observations
  92. GRB050607: refined analysis of prompt REM observations
  93. Swift/UVOT observations of GRB050607
  94. GRB 050607 : Lulin R-band observation
  95. GRB 050607: PROMPT VRcIc Observations
  96. GRB 050607: RAPTOR-S Early Optical Limits
  97. GRB050607: KAIT optical limits
  98. GRB 050525a, Mid-Infrared Observations
  99. GRB 050607: MDM Observations
  100. GRB050607,optical observation

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