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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"

36313 results found.

  1. GRB 050714B: candidate afterglow does not fade
  2. GRB050714B: Refined analysis of the Swift-BAT burst
  3. GRB 050714B: optical afterglow
  4. Swift detection of a long transient (GRB 050714B?)
  5. GRB 050709: optical afterglow candidate
  6. GRB 050714, R-band candidate
  7. GRB 050714: Swift XRT afterglow position
  8. GRB 050714, optical observations
  9. GRB 050714A: ROTSE-III Optical Limits
  10. GRB 050714 - A long GRB detected with INTEGRAL
  11. GRB 050713A: XRT refined analysis
  12. GRB 050709: Spectroscopy
  13. GRB 050713A: RAPTOR detection of early optical emission
  14. GRB050713B :Swift/UVOT observations
  15. GRB050712: TNG R-band observations
  16. GRB 050713B: Swift-BAT Refined Analysis
  17. Swift-BAT Trigger 145729 is not a GRB
  18. GRB 050713A: Swift/UVOT observation
  19. GRB 050713A : Swift-BAT Refined Analysis
  20. GRB 050713A : Lulin R-band observation
  21. GRB 050713A XMM-Newton observation
  22. GRB 050713b : Lulin R-band observations
  23. GRB050713B: Faulkes North Telescope observation
  24. RBO RI observations of GRB 050713A
  25. GRB 050713B
  26. GRB050709 : Chandra source optical counterpart
  27. GRB050713: Liverpool Telescope prompt observations
  28. GRB 050712, optical observations
  29. GRB 050713 : Planned XMM-Newton observation
  30. GRB050709: Candidate X-ray Afterglow from Chandra
  31. GRB 050713, R-band observations at NOT
  32. GRB 050713: ARC NIR Detections and Identification of Fading
  33. GRB050713: possible I-band afterglow
  34. GRB 050713: Swift detection of Bright Burst
  35. GRB 050713A: ROTSE-III Optical Limits
  36. GRB 050709: Swift UVOT and XRT observations
  37. GRB 050712: Swift-BAT Refined Analysis
  38. GRB 050712: Swift XRT afterglow position
  39. GRB 050712: Swift detection of a weak burst
  40. GRB 050709: LCO40 Observations
  41. GRB050709: A Possible Short-Hard GRB Localized by HETE
  42. PROMPT Rc Observations of GRB 050709
  43. GRB 050525a: PROMPT VRcIc Detections
  44. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  45. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  46. GRB 050626 optical observations
  47. GRB 050626: Swift XRT observations
  48. GRB 050701
  49. GRB 050701, optical observations
  50. GRB 050408: ARC 3.5-meter NIR Observations
  51. GRB 050701: Refined XRT analysis
  52. Swift UVOT observations of GRB 050701
  53. GRB 050701: Swift XRT afterglow position
  54. Swift trigger 143708 is really GRB 050701
  55. GRB 050607, radio observations
  56. GRB 050626 - Correction to GCN 3552
  57. GRB 050626 - a long GRB detected with INTEGRAL
  58. GRB 050525A: Swift Late-Time Decay Rate
  59. H3804: A Possible New XRB Detected by HETE
  60. XRF 050509c: Optical monitoring
  61. IBAS Alert #2512 is NOT a GRB
  62. GRB 050416(a): Host Galaxy Redshift Determination
  63. GRB 050607: MDM Observation
  64. GRB 050607 optical decay
  65. GRB 050607: RTT150 optical observations
  66. GRB 050607 : Lulin R-band observation
  67. GRB 050607: PROMPT VRcIc Observations
  68. GRB 050607: RAPTOR-S Early Optical Limits
  69. GRB 050525a, Mid-Infrared Observations
  70. GRB 050607: Optical decay and spectral slope
  71. GRB 050607: MDM Observations
  72. GRB050607,optical observation
  73. GRB 050607 - XRT refined data analysis
  74. Optical Afterglow of GRB 050607
  75. GRB050607 optical limit by "Pi of the Sky"
  76. GRB050607: Swift Detection of a long GRB
  77. GRB050607: P60 Observations
  78. GRB 050603: prediction of t_break
  79. Limits on a SN in the field of GRB 050509b
  80. GRB 050603: Redshift
  81. GRB 050603 - XRT data analysis of the first day
  82. Konus-Wind observation of GRB 050603
  83. GRB 050603: Analysis of UVOT data
  84. GRB 050603: Swift XRT Position
  85. GRB050603: Radio Detection
  86. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  87. GRB 050603: Afterglow Identification from LCO
  88. GRB 050603: INTEGRAL shows it is not a short GRB
  89. GRB 050408: jet break in the XRT light curve
  90. GRB 050525a, infrared observations
  91. GRB 050525a, SMARTS optical/IR afterglow observations
  92. Correction to GCN Circ 3502 on GRB 050528
  93. GRB050528: updated Liverpool Telescope limits
  94. Swift-BAT GRB 050528: a soft burst
  95. Update on Swift-BAT GRB 050528 (Trigger 130679)
  96. GRB050528: BOOTES optical candidate (retraction)
  97. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  98. GRB050528: BOOTES optical candidate
  99. Possible GRB050528: no candidate from Liverpool Telescope
  100. Swift-BAT detection of possible GRB 050528

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