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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"

32723 results found.

  1. GRB 050716: Refined XRT analysis.
  2. GRB050716: Refined analysis of the Swift-BAT burst
  3. GRB 050716: Lulin B and R band optical observations
  4. GRB050716, optical observation
  5. GRB 050716: Optical Observations
  6. GRB050716: Faulkes North Telescope observation
  7. GRB050716: Correction to sign in XRT coordinate
  8. GRB050715: Refined analysis of the Swift-BAT burst
  9. Swift UVOT Observations of GRB 050714B
  10. Konus-Wind observation of GRB 050713A
  11. GRB 050714B: refined XRT analysis
  12. GRB 050713b: RTT150 optical observations
  13. GRB 050714B: candidate afterglow does not fade
  14. GRB050714B: Refined analysis of the Swift-BAT burst
  15. GRB 050714B: optical afterglow
  16. GRB 050709: optical afterglow candidate
  17. GRB 050714, R-band candidate
  18. GRB 050714: Swift XRT afterglow position
  19. GRB 050714, optical observations
  20. GRB 050714A: ROTSE-III Optical Limits
  21. GRB 050713A: XRT refined analysis
  22. GRB 050709: Spectroscopy
  23. GRB 050713A: RAPTOR detection of early optical emission
  24. GRB050713B :Swift/UVOT observations
  25. GRB050713b: XRT refined analysis
  26. GRB050712: TNG R-band observations
  27. GRB 050713B: Swift-BAT Refined Analysis
  28. Swift-BAT Trigger 145729 is not a GRB
  29. GRB 050713A: Swift/UVOT observation
  30. GRB 050713A : Swift-BAT Refined Analysis
  31. GRB050712: Swift UVOT Observation of Afterglow Emission
  32. GRB 050713A XMM-Newton observation
  33. GRB 050713b : Lulin R-band observations
  34. GRB050713B: Faulkes North Telescope observation
  35. RBO RI observations of GRB 050713A
  36. GRB050709 : Chandra source optical counterpart
  37. GRB050713: Liverpool Telescope prompt observations
  38. GRB 050712, optical observations
  39. GRB050709: Candidate X-ray Afterglow from Chandra
  40. GRB 050713: ARC NIR Detections and Identification of Fading
  41. GRB050713: possible I-band afterglow
  42. GRB 050713A: ROTSE-III Optical Limits
  43. GRB050712: XRT refined analysis
  44. GRB050709: Radio Observations
  45. GRB 050709: Swift UVOT and XRT observations
  46. GRB 050712: Swift-BAT Refined Analysis
  47. GRB050712: UVOT candidate optical counterpart
  48. GRB 050712: Swift XRT afterglow position
  49. GRB 050709: LCO40 Observations
  50. GRB050709, optical observations
  51. GRB050709: A Possible Short-Hard GRB Localized by HETE
  52. GRB 050525a: PROMPT VRcIc Detections
  53. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  54. GRB 050626 optical observations
  55. GRB 050701
  56. GRB 050701, optical observations
  57. GRB 050408: ARC 3.5-meter NIR Observations
  58. GRB 050701: Refined XRT analysis
  59. Swift UVOT observations of GRB 050701
  60. GRB050701: Swift-BAT Refined analysis
  61. GRB 050701: Swift XRT afterglow position
  62. GRB 050607, radio observations
  63. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  64. GRB 050626 - Correction to GCN 3552
  65. GRB 050626 - a long GRB detected with INTEGRAL
  66. GRB 050525A: Swift Late-Time Decay Rate
  67. GRB050525a: HST Observations
  68. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  69. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  70. XRF 050509c: Optical monitoring
  71. XRF050509c: Radio Detection
  72. GRB 050416(a): Host Galaxy Redshift Determination
  73. GRB 050607: MDM Observation
  74. GRB 050607: RTT150 optical observations
  75. GRB050607: refined analysis of prompt REM observations
  76. Swift/UVOT observations of GRB050607
  77. GRB 050607 : Lulin R-band observation
  78. GRB 050607: PROMPT VRcIc Observations
  79. GRB 050607: RAPTOR-S Early Optical Limits
  80. GRB050607: KAIT optical limits
  81. GRB 050525a, Mid-Infrared Observations
  82. GRB 050607: MDM Observations
  83. GRB050607,optical observation
  84. GRB 050607 - XRT refined data analysis
  85. GRB 050603: prediction of t_break
  86. Limits on a SN in the field of GRB 050509b
  87. GRB 050603: Redshift
  88. GRB 050603 - XRT data analysis of the first day
  89. Konus-Wind observation of GRB 050603
  90. GRB 050603: Analysis of UVOT data
  91. GRB050603: Fading Afterglow observed by Swift UVOT
  92. GRB050603, submillimetre observations
  93. GRB 050603: Swift XRT Position
  94. GRB050603: Radio Detection
  95. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  96. GRB 050603: Afterglow Identification from LCO
  97. GRB 050603: INTEGRAL shows it is not a short GRB
  98. GRB 050408: jet break in the XRT light curve
  99. GRB 050525a, infrared observations
  100. GRB 050525a, SMARTS optical/IR afterglow observations

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