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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"

27027 results found.

  1. Swift detection of a long transient (GRB 050714B?)
  2. GRB 050714A: ROTSE-III Optical Limits
  3. GRB 050713A: XRT refined analysis
  4. GRB 050713A: RAPTOR detection of early optical emission
  5. GRB050713B :Swift/UVOT observations
  6. GRB050713b: XRT refined analysis
  7. GRB 050713B: Swift-BAT Refined Analysis
  8. Swift-BAT Trigger 145729 is not a GRB
  9. GRB 050713A: Swift/UVOT observation
  10. GRB 050713A : Swift-BAT Refined Analysis
  11. GRB050713B: Faulkes North Telescope observation
  12. RBO RI observations of GRB 050713A
  13. GRB 050713B
  14. GRB 050713: Swift detection of Bright Burst
  15. GRB 050713A: ROTSE-III Optical Limits
  16. GRB 050712: Swift-BAT Refined Analysis
  17. GRB050712: UVOT candidate optical counterpart
  18. GRB 050712: Swift XRT afterglow position
  19. GRB 050712: Swift detection of a weak burst
  20. GRB050709: A Possible Short-Hard GRB Localized by HETE
  21. GRB 050701
  22. GRB 050701, optical observations
  23. GRB 050701: Refined XRT analysis
  24. Swift UVOT observations of GRB 050701
  25. GRB050701: Swift-BAT Refined analysis
  26. Swift trigger 143708 is really GRB 050701
  27. GRB 050525A: Swift Late-Time Decay Rate
  28. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  29. XRF 050509c: Optical monitoring
  30. Konus-Wind observation of an intermediate burst from SGR 1806-20
  31. GRB 050607 optical decay
  32. Swift/UVOT observations of GRB050607
  33. GRB 050607: RAPTOR-S Early Optical Limits
  34. GRB 050607: MDM Observations
  35. GRB050607,optical observation
  36. GRB 050607 - XRT refined data analysis
  37. GRB050607 optical limit by "Pi of the Sky"
  38. GRB050607: Swift Detection of a long GRB
  39. GRB 050603: prediction of t_break
  40. Konus-Wind observation of GRB 050603
  41. GRB050603: Fading Afterglow observed by Swift UVOT
  42. GRB 050603: Swift XRT Position
  43. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  44. Swift/BAT Detection of GRB050603
  45. GRB 050408: jet break in the XRT light curve
  46. GRB050528, XRT observations
  47. Swift-BAT GRB 050528: a soft burst
  48. Update on Swift-BAT GRB 050528 (Trigger 130679)
  49. GRB050528: BOOTES optical candidate (retraction)
  50. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  51. GRB050528: BOOTES optical candidate
  52. Possible GRB050528: no candidate from Liverpool Telescope
  53. Swift-BAT detection of possible GRB 050528
  54. GRB 050525B: Swift-BAT observations
  55. GRB050525A,optical observation
  56. GRB050525: Super-LOTIS observations
  57. GRB 050525A: Swift-BAT refined analysis
  58. Swift/UVOT UV and optical detections of GRB 050525
  59. Konus-Wind observation of GRB 050525
  60. GRB 050525 - Very Bright, Not Short
  61. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  62. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  63. GRB 050509A: Further I-band imaging
  64. GRB050522,optical observation
  65. GRB050520,optical observation
  66. GRB 050520: VLT/ULTRACAM observations
  67. GRB 050520: BART optical limit
  68. No Swift-BAT Lightcurves in real-time for next 3 weeks
  69. Swift-BAT trigger 122203 is not a real GRB
  70. XRF 050509C: REM NIR and Optical refined analysis
  71. XRF 050509c optical afterglow
  72. GRB050502b: Early Observation
  73. GRB050509b, SDSS pre-burst observations
  74. GRB 050509b: RAPTOR deep, early limits.
  75. GRB 050509b: Swift/UVOT follow-up measurements
  76. GRB050509B: Optical observations at the Very Large Telescope
  77. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  78. GRB 050509a: Swift-BAT refined analysis
  79. GRB 050509c: ROTSE-III Optical Limits
  80. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  81. GRB050509c: REM NIR and Optical observations
  82. Swift UVOT Follow-up Observations of GRB 050509B
  83. GRB 050509B: Swift/XRT refined analysis
  84. GRB050509a: Swift UVOT observations
  85. GRB 050509b: Optical observations
  86. GRB 050509A: Optical observations
  87. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  88. GRB 050509B: ROTSE-III Optical Limits
  89. Swift Detection of GRB050509b: A short duration burst
  90. Swift Detection of the Burst GRB050509
  91. Swift-BAT detection of GRB 050507
  92. GRB050505: Infrared observations
  93. GRB 050505: Further Swift UVOT observations.
  94. GRB 050505 UVOT
  95. GRB050505 Swift-BAT refined analysis
  96. GRB 050416b:Swift XRT afterglow upper limits
  97. GRB 050416b:Swift XRT afterglow upper limits
  98. Swift-BAT detection of GRB050505
  99. Swift UVOT observation of GRB 050504
  100. GRB050504: Faulkes North optical robotic limit

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