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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"

19941 results found.

  1. GRB 050715: Swift-BAT detection
  2. Swift UVOT Observations of GRB 050714B
  3. Konus-Wind observation of GRB 050713A
  4. GRB 050714B: refined XRT analysis
  5. GRB050714B: Refined analysis of the Swift-BAT burst
  6. Swift detection of a long transient (GRB 050714B?)
  7. GRB 050714: Swift XRT afterglow position
  8. GRB 050713A: XRT refined analysis
  9. GRB 050713A: RAPTOR detection of early optical emission
  10. GRB050713B :Swift/UVOT observations
  11. GRB050713b: XRT refined analysis
  12. GRB 050713B: Swift-BAT Refined Analysis
  13. Swift-BAT Trigger 145729 is not a GRB
  14. GRB 050713A: Swift/UVOT observation
  15. GRB 050713A : Swift-BAT Refined Analysis
  16. GRB050712: Swift UVOT Observation of Afterglow Emission
  17. GRB 050713A XMM-Newton observation
  18. GRB050713B: Faulkes North Telescope observation
  19. RBO RI observations of GRB 050713A
  20. GRB 050713B
  21. GRB050713: Liverpool Telescope prompt observations
  22. GRB050709: Candidate X-ray Afterglow from Chandra
  23. GRB 050713, R-band observations at NOT
  24. GRB 050713: Swift detection of Bright Burst
  25. GRB 050713A: ROTSE-III Optical Limits
  26. GRB050712: XRT refined analysis
  27. GRB 050709: Swift UVOT and XRT observations
  28. GRB 050712: Swift-BAT Refined Analysis
  29. GRB050712: UVOT candidate optical counterpart
  30. GRB 050712: Swift XRT afterglow position
  31. GRB 050712: Swift detection of a weak burst
  32. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  33. GRB 050626: Swift XRT observations
  34. GRB 050701
  35. GRB 050701, optical observations
  36. GRB 050701: Refined XRT analysis
  37. Swift UVOT observations of GRB 050701
  38. GRB050701: Swift-BAT Refined analysis
  39. GRB 050701: Swift XRT afterglow position
  40. Swift trigger 143708 is really GRB 050701
  41. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  42. GRB 050525A: Swift Late-Time Decay Rate
  43. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  44. Konus-Wind observation of an intermediate burst from SGR 1806-20
  45. GRB 050416(a): Host Galaxy Redshift Determination
  46. Swift/UVOT observations of GRB050607
  47. GRB 050607: RAPTOR-S Early Optical Limits
  48. GRB050607: KAIT optical limits
  49. GRB 050607: MDM Observations
  50. GRB050607,optical observation
  51. GRB 050607 - XRT refined data analysis
  52. GRB050607 optical limit by "Pi of the Sky"
  53. GRB050607: Swift Detection of a long GRB
  54. GRB 050603 - XRT data analysis of the first day
  55. Konus-Wind observation of GRB 050603
  56. GRB 050603: Analysis of UVOT data
  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. Correction to GCN Circ 3502 on GRB 050528
  64. Swift-BAT GRB 050528: a soft burst
  65. Update on Swift-BAT GRB 050528 (Trigger 130679)
  66. Possible GRB050528: no candidate from Liverpool Telescope
  67. Swift-BAT detection of possible GRB 050528
  68. GRB 050509b: refined XRT/Chandra afterglow position analysis
  69. GRB050525a: optical upper limits
  70. GRB 050525B: Swift-BAT observations
  71. GRB050525A,optical observation
  72. GRB050525: Super-LOTIS observations
  73. GRB 050525, spectral lag pseudo-redshift
  74. GRB050306: optical afterglow not confirmed
  75. GRB 050525A: BOOTES simultaneous optical 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: TAROT observations of the early afterglow
  80. INTEGRAL detection of GRB 050525
  81. GRB 050525: Optical observation
  82. GRB050525: ROTSE-III Refined Analysis
  83. GRB 050525 - Very Bright, Not Short
  84. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  85. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  86. XRF 050522: Swift XRT refined analysis
  87. Swift/UVOT observation of XRF 050522
  88. GRB 050509A: Further I-band imaging
  89. RBO Observations of GRB050522
  90. XRF 050522: Swift XRT observation
  91. GRB 050520: VLT/ULTRACAM observations
  92. Swift UVOT Observations of GRB 050520
  93. GRB 050520: Swift XRT refined analysis
  94. XRF050509C: Chandra Afterglow Detection
  95. XRF 050509c: Swift XRT Upper Limit
  96. RBO Observations of GRB050520
  97. GRB 050520: TAROT optical limit
  98. GRB 050520: Swift XRT position
  99. No Swift-BAT Lightcurves in real-time for next 3 weeks
  100. Swift-BAT trigger 122203 is not a real GRB

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