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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"

28879 results found.

  1. GRB 050717: Swift-BAT refined analysis
  2. GRB 050717: Refined XRT analysis.
  3. Swift detection of GRB 050717
  4. Swift UVOT Observations of GRB 050716
  5. GRB 050716: Refined XRT analysis.
  6. GRB050716: Refined analysis of the Swift-BAT burst
  7. GRB050716, optical observation
  8. GRB 050716: Optical Observations
  9. GRB050716: Faulkes North Telescope observation
  10. Swift/BAT detection of GRB 050716
  11. GRB050715: Refined analysis of the Swift-BAT burst
  12. GRB 050715: Swift-BAT detection
  13. Swift UVOT Observations of GRB 050714B
  14. Konus-Wind observation of GRB 050713A
  15. GRB 050714B: refined XRT analysis
  16. GRB050714B: Refined analysis of the Swift-BAT burst
  17. Swift detection of a long transient (GRB 050714B?)
  18. GRB 050714A: ROTSE-III Optical Limits
  19. GRB 050713A: XRT refined analysis
  20. GRB 050713A: RAPTOR detection of early optical emission
  21. GRB050713B :Swift/UVOT observations
  22. GRB050713b: XRT refined analysis
  23. GRB 050713B: Swift-BAT Refined Analysis
  24. Swift-BAT Trigger 145729 is not a GRB
  25. GRB 050713A: Swift/UVOT observation
  26. GRB 050713A : Swift-BAT Refined Analysis
  27. GRB050713B: Faulkes North Telescope observation
  28. RBO RI observations of GRB 050713A
  29. GRB 050713B
  30. GRB 050713: Swift detection of Bright Burst
  31. GRB 050713A: ROTSE-III Optical Limits
  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. GRB050709: A Possible Short-Hard GRB Localized by HETE
  37. GRB 050701
  38. GRB 050701, optical observations
  39. GRB 050701: Refined XRT analysis
  40. Swift UVOT observations of GRB 050701
  41. GRB050701: Swift-BAT Refined analysis
  42. Swift trigger 143708 is really GRB 050701
  43. GRB 050525A: Swift Late-Time Decay Rate
  44. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  45. XRF 050509c: Optical monitoring
  46. Konus-Wind observation of an intermediate burst from SGR 1806-20
  47. GRB 050607 optical decay
  48. Swift/UVOT observations of GRB050607
  49. GRB 050607: RAPTOR-S Early Optical Limits
  50. GRB 050607: MDM Observations
  51. GRB050607,optical observation
  52. GRB 050607 - XRT refined data analysis
  53. GRB050607 optical limit by "Pi of the Sky"
  54. GRB050607: Swift Detection of a long GRB
  55. GRB 050603: prediction of t_break
  56. Konus-Wind observation of GRB 050603
  57. GRB050603: Fading Afterglow observed by Swift UVOT
  58. GRB 050603: Swift XRT Position
  59. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  60. Swift/BAT Detection of GRB050603
  61. GRB 050408: jet break in the XRT light curve
  62. GRB050528, XRT observations
  63. Swift-BAT GRB 050528: a soft burst
  64. Update on Swift-BAT GRB 050528 (Trigger 130679)
  65. GRB050528: BOOTES optical candidate (retraction)
  66. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  67. GRB050528: BOOTES optical candidate
  68. Possible GRB050528: no candidate from Liverpool Telescope
  69. Swift-BAT detection of possible GRB 050528
  70. GRB 050525B: Swift-BAT observations
  71. GRB050525A,optical observation
  72. GRB050525: Super-LOTIS observations
  73. GRB 050525A: Swift-BAT refined analysis
  74. Swift/UVOT UV and optical detections of GRB 050525
  75. Konus-Wind observation of GRB 050525
  76. GRB 050525 - Very Bright, Not Short
  77. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  78. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  79. GRB 050509A: Further I-band imaging
  80. GRB050522,optical observation
  81. GRB050520,optical observation
  82. GRB 050520: VLT/ULTRACAM observations
  83. GRB 050520: BART optical limit
  84. No Swift-BAT Lightcurves in real-time for next 3 weeks
  85. Swift-BAT trigger 122203 is not a real GRB
  86. XRF 050509C: REM NIR and Optical refined analysis
  87. XRF 050509c optical afterglow
  88. GRB050509b, SDSS pre-burst observations
  89. GRB 050509b: RAPTOR deep, early limits.
  90. GRB 050509b: Swift/UVOT follow-up measurements
  91. GRB050509B: Optical observations at the Very Large Telescope
  92. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  93. GRB 050509a: Swift-BAT refined analysis
  94. GRB 050509c: ROTSE-III Optical Limits
  95. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  96. GRB050509c: REM NIR and Optical observations
  97. Swift UVOT Follow-up Observations of GRB 050509B
  98. GRB 050509B: Swift/XRT refined analysis
  99. GRB050509a: Swift UVOT observations
  100. GRB 050509b: Optical observations

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