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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"

36309 results found.

  1. GRB 050709: optical afterglow candidate
  2. GRB 050714, R-band candidate
  3. GRB 050714: Swift XRT afterglow position
  4. GRB 050714, optical observations
  5. GRB 050714A: ROTSE-III Optical Limits
  6. GRB 050714 - A long GRB detected with INTEGRAL
  7. GRB 050713A: XRT refined analysis
  8. GRB 050709: Spectroscopy
  9. GRB 050713A: RAPTOR detection of early optical emission
  10. GRB050713B :Swift/UVOT observations
  11. GRB050712: TNG R-band observations
  12. GRB 050713B: Swift-BAT Refined Analysis
  13. Swift-BAT Trigger 145729 is not a GRB
  14. GRB 050713A: Swift/UVOT observation
  15. GRB 050713A : Swift-BAT Refined Analysis
  16. GRB 050713A : Lulin R-band observation
  17. GRB 050713A XMM-Newton observation
  18. GRB 050713b : Lulin R-band observations
  19. GRB050713B: Faulkes North Telescope observation
  20. RBO RI observations of GRB 050713A
  21. GRB 050713B
  22. GRB050709 : Chandra source optical counterpart
  23. GRB050713: Liverpool Telescope prompt observations
  24. GRB 050712, optical observations
  25. GRB 050713 : Planned XMM-Newton observation
  26. GRB050709: Candidate X-ray Afterglow from Chandra
  27. GRB 050713, R-band observations at NOT
  28. GRB 050713: ARC NIR Detections and Identification of Fading
  29. GRB050713: possible I-band afterglow
  30. GRB 050713: Swift detection of Bright Burst
  31. GRB 050713A: ROTSE-III Optical Limits
  32. GRB 050709: Swift UVOT and XRT observations
  33. GRB 050712: Swift-BAT Refined Analysis
  34. GRB 050712: Swift XRT afterglow position
  35. GRB 050712: Swift detection of a weak burst
  36. GRB 050709: LCO40 Observations
  37. GRB050709: A Possible Short-Hard GRB Localized by HETE
  38. PROMPT Rc Observations of GRB 050709
  39. GRB 050525a: PROMPT VRcIc Detections
  40. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  41. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  42. GRB 050626 optical observations
  43. GRB 050626: Swift XRT observations
  44. GRB 050701
  45. GRB 050701, optical observations
  46. GRB 050408: ARC 3.5-meter NIR Observations
  47. GRB 050701: Refined XRT analysis
  48. Swift UVOT observations of GRB 050701
  49. GRB 050701: Swift XRT afterglow position
  50. Swift trigger 143708 is really GRB 050701
  51. GRB 050607, radio observations
  52. GRB 050626 - Correction to GCN 3552
  53. GRB 050626 - a long GRB detected with INTEGRAL
  54. GRB 050525A: Swift Late-Time Decay Rate
  55. H3804: A Possible New XRB Detected by HETE
  56. XRF 050509c: Optical monitoring
  57. IBAS Alert #2512 is NOT a GRB
  58. GRB 050416(a): Host Galaxy Redshift Determination
  59. GRB 050607: MDM Observation
  60. GRB 050607 optical decay
  61. GRB 050607: RTT150 optical observations
  62. GRB 050607 : Lulin R-band observation
  63. GRB 050607: PROMPT VRcIc Observations
  64. GRB 050607: RAPTOR-S Early Optical Limits
  65. GRB 050525a, Mid-Infrared Observations
  66. GRB 050607: Optical decay and spectral slope
  67. GRB 050607: MDM Observations
  68. GRB050607,optical observation
  69. GRB 050607 - XRT refined data analysis
  70. Optical Afterglow of GRB 050607
  71. GRB050607 optical limit by "Pi of the Sky"
  72. GRB050607: Swift Detection of a long GRB
  73. GRB050607: P60 Observations
  74. GRB 050603: prediction of t_break
  75. Limits on a SN in the field of GRB 050509b
  76. GRB 050603: Redshift
  77. GRB 050603 - XRT data analysis of the first day
  78. Konus-Wind observation of GRB 050603
  79. GRB 050603: Analysis of UVOT data
  80. GRB 050603: Swift XRT Position
  81. GRB050603: Radio Detection
  82. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  83. GRB 050603: Afterglow Identification from LCO
  84. GRB 050603: INTEGRAL shows it is not a short GRB
  85. GRB 050408: jet break in the XRT light curve
  86. GRB 050525a, infrared observations
  87. GRB 050525a, SMARTS optical/IR afterglow observations
  88. Correction to GCN Circ 3502 on GRB 050528
  89. GRB050528: updated Liverpool Telescope limits
  90. Swift-BAT GRB 050528: a soft burst
  91. Update on Swift-BAT GRB 050528 (Trigger 130679)
  92. GRB050528: BOOTES optical candidate (retraction)
  93. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  94. GRB050528: BOOTES optical candidate
  95. Possible GRB050528: no candidate from Liverpool Telescope
  96. Swift-BAT detection of possible GRB 050528
  97. GRB050525a: Radio Observations
  98. GRB 050509b: refined XRT/Chandra afterglow position analysis
  99. GRB 050525: RTT150, Optical observations
  100. GRB050525a: optical upper limits

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