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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"

28882 results found.

  1. Swift-BAT detection of a possible GRB
  2. Konus-Wind observation of GRB 050717
  3. Swift/UVOT Observations of GRB 050717
  4. GRB 050717: Swift-BAT refined analysis
  5. GRB 050717: Refined XRT analysis.
  6. Swift detection of GRB 050717
  7. Swift UVOT Observations of GRB 050716
  8. GRB 050716: Refined XRT analysis.
  9. GRB050716: Refined analysis of the Swift-BAT burst
  10. GRB050716, optical observation
  11. GRB 050716: Optical Observations
  12. GRB050716: Faulkes North Telescope observation
  13. Swift/BAT detection of GRB 050716
  14. GRB050715: Refined analysis of the Swift-BAT burst
  15. GRB 050715: Swift-BAT detection
  16. Swift UVOT Observations of GRB 050714B
  17. Konus-Wind observation of GRB 050713A
  18. GRB 050714B: refined XRT analysis
  19. GRB050714B: Refined analysis of the Swift-BAT burst
  20. Swift detection of a long transient (GRB 050714B?)
  21. GRB 050714A: ROTSE-III Optical Limits
  22. GRB 050713A: XRT refined analysis
  23. GRB 050713A: RAPTOR detection of early optical emission
  24. GRB050713B :Swift/UVOT observations
  25. GRB050713b: XRT refined analysis
  26. GRB 050713B: Swift-BAT Refined Analysis
  27. Swift-BAT Trigger 145729 is not a GRB
  28. GRB 050713A: Swift/UVOT observation
  29. GRB 050713A : Swift-BAT Refined Analysis
  30. GRB050713B: Faulkes North Telescope observation
  31. RBO RI observations of GRB 050713A
  32. GRB 050713B
  33. GRB 050713: Swift detection of Bright Burst
  34. GRB 050713A: ROTSE-III Optical Limits
  35. GRB 050712: Swift-BAT Refined Analysis
  36. GRB050712: UVOT candidate optical counterpart
  37. GRB 050712: Swift XRT afterglow position
  38. GRB 050712: Swift detection of a weak burst
  39. GRB050709: A Possible Short-Hard GRB Localized by HETE
  40. GRB 050701
  41. GRB 050701, optical observations
  42. GRB 050701: Refined XRT analysis
  43. Swift UVOT observations of GRB 050701
  44. GRB050701: Swift-BAT Refined analysis
  45. Swift trigger 143708 is really GRB 050701
  46. GRB 050525A: Swift Late-Time Decay Rate
  47. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  48. XRF 050509c: Optical monitoring
  49. Konus-Wind observation of an intermediate burst from SGR 1806-20
  50. GRB 050607 optical decay
  51. Swift/UVOT observations of GRB050607
  52. GRB 050607: RAPTOR-S Early Optical Limits
  53. GRB 050607: MDM Observations
  54. GRB050607,optical observation
  55. GRB 050607 - XRT refined data analysis
  56. GRB050607 optical limit by "Pi of the Sky"
  57. GRB050607: Swift Detection of a long GRB
  58. GRB 050603: prediction of t_break
  59. Konus-Wind observation of GRB 050603
  60. GRB050603: Fading Afterglow observed by Swift UVOT
  61. GRB 050603: Swift XRT Position
  62. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  63. Swift/BAT Detection of GRB050603
  64. GRB 050408: jet break in the XRT light curve
  65. GRB050528, XRT observations
  66. Swift-BAT GRB 050528: a soft burst
  67. Update on Swift-BAT GRB 050528 (Trigger 130679)
  68. GRB050528: BOOTES optical candidate (retraction)
  69. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  70. GRB050528: BOOTES optical candidate
  71. Possible GRB050528: no candidate from Liverpool Telescope
  72. Swift-BAT detection of possible GRB 050528
  73. GRB 050525B: Swift-BAT observations
  74. GRB050525A,optical observation
  75. GRB050525: Super-LOTIS observations
  76. GRB 050525A: Swift-BAT refined analysis
  77. Swift/UVOT UV and optical detections of GRB 050525
  78. Konus-Wind observation of GRB 050525
  79. GRB 050525 - Very Bright, Not Short
  80. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  81. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  82. GRB 050509A: Further I-band imaging
  83. GRB050522,optical observation
  84. GRB050520,optical observation
  85. GRB 050520: VLT/ULTRACAM observations
  86. GRB 050520: BART optical limit
  87. No Swift-BAT Lightcurves in real-time for next 3 weeks
  88. Swift-BAT trigger 122203 is not a real GRB
  89. XRF 050509C: REM NIR and Optical refined analysis
  90. XRF 050509c optical afterglow
  91. GRB050509b, SDSS pre-burst observations
  92. GRB 050509b: RAPTOR deep, early limits.
  93. GRB 050509b: Swift/UVOT follow-up measurements
  94. GRB050509B: Optical observations at the Very Large Telescope
  95. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  96. GRB 050509a: Swift-BAT refined analysis
  97. GRB 050509c: ROTSE-III Optical Limits
  98. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  99. GRB050509c: REM NIR and Optical observations
  100. Swift UVOT Follow-up Observations of GRB 050509B

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