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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27297 results found.

  1. GRB050716: Correction to sign in XRT coordinate
  2. Swift/BAT detection of GRB 050716
  3. GRB050715: Refined analysis of the Swift-BAT burst
  4. GRB 050715: Swift-BAT detection
  5. Swift UVOT Observations of GRB 050714B
  6. Konus-Wind observation of GRB 050713A
  7. GRB 050714B: refined XRT analysis
  8. GRB050714B: Refined analysis of the Swift-BAT burst
  9. Swift detection of a long transient (GRB 050714B?)
  10. GRB 050709: optical afterglow candidate
  11. GRB 050714: Swift XRT afterglow position
  12. GRB 050713A: XRT refined analysis
  13. GRB 050713A: RAPTOR detection of early optical emission
  14. GRB050713B :Swift/UVOT observations
  15. GRB050713b: XRT refined analysis
  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. GRB050712: Swift UVOT Observation of Afterglow Emission
  21. GRB 050713A XMM-Newton observation
  22. GRB050713B: Faulkes North Telescope observation
  23. RBO RI observations of GRB 050713A
  24. GRB 050713B
  25. GRB050713: Liverpool Telescope prompt observations
  26. GRB050709: Candidate X-ray Afterglow from Chandra
  27. GRB 050713, R-band observations at NOT
  28. GRB 050713: Swift detection of Bright Burst
  29. GRB 050713A: ROTSE-III Optical Limits
  30. GRB050712: XRT refined analysis
  31. GRB 050709: Swift UVOT and XRT observations
  32. GRB 050712: Swift-BAT Refined Analysis
  33. GRB050712: UVOT candidate optical counterpart
  34. GRB 050712: Swift XRT afterglow position
  35. GRB 050712: Swift detection of a weak burst
  36. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  37. GRB 050626: Swift XRT observations
  38. GRB 050701
  39. GRB 050701, optical observations
  40. GRB 050701: Refined XRT analysis
  41. Swift UVOT observations of GRB 050701
  42. GRB050701: Swift-BAT Refined analysis
  43. GRB 050701: Swift XRT afterglow position
  44. Swift trigger 143708 is really GRB 050701
  45. GRB 050525A: Swift Late-Time Decay Rate
  46. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  47. XRF050509c: Radio Detection
  48. GRB 050416(a): Host Galaxy Redshift Determination
  49. GRB050607: refined analysis of prompt REM observations
  50. Swift/UVOT observations of GRB050607
  51. GRB 050607: RAPTOR-S Early Optical Limits
  52. GRB050607: KAIT optical limits
  53. GRB 050525a, Mid-Infrared Observations
  54. GRB 050607: MDM Observations
  55. GRB050607,optical observation
  56. GRB 050607 - XRT refined data analysis
  57. GRB050607 optical limit by "Pi of the Sky"
  58. GRB050607: Swift Detection of a long GRB
  59. Limits on a SN in the field of GRB 050509b
  60. GRB 050603 - XRT data analysis of the first day
  61. Konus-Wind observation of GRB 050603
  62. GRB 050603: Analysis of UVOT data
  63. GRB050603: Fading Afterglow observed by Swift UVOT
  64. GRB 050603: Swift XRT Position
  65. GRB050603: Radio Detection
  66. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  67. Swift/BAT Detection of GRB050603
  68. GRB 050408: jet break in the XRT light curve
  69. GRB050528, XRT observations
  70. Correction to GCN Circ 3502 on GRB 050528
  71. Swift-BAT GRB 050528: a soft burst
  72. Update on Swift-BAT GRB 050528 (Trigger 130679)
  73. Possible GRB050528: no candidate from Liverpool Telescope
  74. Swift-BAT detection of possible GRB 050528
  75. GRB 050509b: refined XRT/Chandra afterglow position analysis
  76. GRB050525a: optical upper limits
  77. GRB 050525B: Swift-BAT observations
  78. GRB050525A,optical observation
  79. GRB050525: Super-LOTIS observations
  80. GRB 050525, spectral lag pseudo-redshift
  81. GRB050306: optical afterglow not confirmed
  82. GRB 050525: BART optical observation
  83. GRB 050525A: BOOTES simultaneous optical observations
  84. GRB 050525A: Swift-BAT refined analysis
  85. Swift/UVOT UV and optical detections of GRB 050525
  86. Konus-Wind observation of GRB 050525
  87. GRB 050525: TAROT observations of the early afterglow
  88. INTEGRAL detection of GRB 050525
  89. GRB 050525: Optical observation
  90. GRB050525: ROTSE-III Refined Analysis
  91. GRB 050525 - Very Bright, Not Short
  92. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  93. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  94. XRF 050522: Swift XRT refined analysis
  95. Swift/UVOT observation of XRF 050522
  96. GRB 050509A: Further I-band imaging
  97. RBO Observations of GRB050522
  98. XRF 050522: Swift XRT observation
  99. GRB 050520: VLT/ULTRACAM observations
  100. Swift UVOT Observations of GRB 050520

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