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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"

36210 results found.

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

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