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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"

27024 results found.

  1. GRB 050713A: RAPTOR detection of early optical emission
  2. GRB050713B :Swift/UVOT observations
  3. GRB050713b: XRT refined analysis
  4. GRB 050713B: Swift-BAT Refined Analysis
  5. Swift-BAT Trigger 145729 is not a GRB
  6. GRB 050713A: Swift/UVOT observation
  7. GRB 050713A : Swift-BAT Refined Analysis
  8. GRB050713B: Faulkes North Telescope observation
  9. RBO RI observations of GRB 050713A
  10. GRB 050713B
  11. GRB 050713: Swift detection of Bright Burst
  12. GRB 050713A: ROTSE-III Optical Limits
  13. GRB 050712: Swift-BAT Refined Analysis
  14. GRB050712: UVOT candidate optical counterpart
  15. GRB 050712: Swift XRT afterglow position
  16. GRB 050712: Swift detection of a weak burst
  17. GRB050709: A Possible Short-Hard GRB Localized by HETE
  18. GRB 050701
  19. GRB 050701, optical observations
  20. GRB 050701: Refined XRT analysis
  21. Swift UVOT observations of GRB 050701
  22. GRB050701: Swift-BAT Refined analysis
  23. Swift trigger 143708 is really GRB 050701
  24. GRB 050525A: Swift Late-Time Decay Rate
  25. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  26. XRF 050509c: Optical monitoring
  27. Konus-Wind observation of an intermediate burst from SGR 1806-20
  28. GRB 050607 optical decay
  29. Swift/UVOT observations of GRB050607
  30. GRB 050607: RAPTOR-S Early Optical Limits
  31. GRB 050607: MDM Observations
  32. GRB050607,optical observation
  33. GRB 050607 - XRT refined data analysis
  34. GRB050607 optical limit by "Pi of the Sky"
  35. GRB050607: Swift Detection of a long GRB
  36. GRB 050603: prediction of t_break
  37. Konus-Wind observation of GRB 050603
  38. GRB050603: Fading Afterglow observed by Swift UVOT
  39. GRB 050603: Swift XRT Position
  40. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  41. Swift/BAT Detection of GRB050603
  42. GRB 050408: jet break in the XRT light curve
  43. GRB050528, XRT observations
  44. Swift-BAT GRB 050528: a soft burst
  45. Update on Swift-BAT GRB 050528 (Trigger 130679)
  46. GRB050528: BOOTES optical candidate (retraction)
  47. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  48. GRB050528: BOOTES optical candidate
  49. Possible GRB050528: no candidate from Liverpool Telescope
  50. Swift-BAT detection of possible GRB 050528
  51. GRB 050525B: Swift-BAT observations
  52. GRB050525A,optical observation
  53. GRB050525: Super-LOTIS observations
  54. GRB 050525A: Swift-BAT refined analysis
  55. Swift/UVOT UV and optical detections of GRB 050525
  56. Konus-Wind observation of GRB 050525
  57. GRB 050525 - Very Bright, Not Short
  58. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  59. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  60. GRB 050509A: Further I-band imaging
  61. GRB050522,optical observation
  62. GRB050520,optical observation
  63. GRB 050520: VLT/ULTRACAM observations
  64. GRB 050520: BART optical limit
  65. No Swift-BAT Lightcurves in real-time for next 3 weeks
  66. Swift-BAT trigger 122203 is not a real GRB
  67. XRF 050509C: REM NIR and Optical refined analysis
  68. XRF 050509c optical afterglow
  69. GRB050502b: Early Observation
  70. GRB050509b, SDSS pre-burst observations
  71. GRB 050509b: RAPTOR deep, early limits.
  72. GRB 050509b: Swift/UVOT follow-up measurements
  73. GRB050509B: Optical observations at the Very Large Telescope
  74. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  75. GRB 050509a: Swift-BAT refined analysis
  76. GRB 050509c: ROTSE-III Optical Limits
  77. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  78. GRB050509c: REM NIR and Optical observations
  79. Swift UVOT Follow-up Observations of GRB 050509B
  80. GRB 050509B: Swift/XRT refined analysis
  81. GRB050509a: Swift UVOT observations
  82. GRB 050509b: Optical observations
  83. GRB 050509A: Optical observations
  84. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  85. GRB 050509B: ROTSE-III Optical Limits
  86. Swift Detection of GRB050509b: A short duration burst
  87. Swift Detection of the Burst GRB050509
  88. Swift-BAT detection of GRB 050507
  89. GRB050505: Infrared observations
  90. GRB 050505: Further Swift UVOT observations.
  91. GRB 050505 UVOT
  92. GRB050505 Swift-BAT refined analysis
  93. GRB 050416b:Swift XRT afterglow upper limits
  94. GRB 050416b:Swift XRT afterglow upper limits
  95. Swift-BAT detection of GRB050505
  96. Swift UVOT observation of GRB 050504
  97. GRB050504: Faulkes North optical robotic limit
  98. GRB 050502b, V band Observations
  99. GRB (?) 050504: IR Observations, Intriguing Source
  100. Renewal of SGR 1806-20 activity

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