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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').

17112 results found.

  1. Konus-Wind observation of GRB 050713A
  2. GRB 050714B: refined XRT analysis
  3. GRB050714B: Refined analysis of the Swift-BAT burst
  4. Swift detection of a long transient (GRB 050714B?)
  5. GRB 050714: Swift XRT afterglow position
  6. GRB 050713A: XRT refined analysis
  7. GRB 050713A: RAPTOR detection of early optical emission
  8. GRB050713B :Swift/UVOT observations
  9. GRB050713b: XRT refined analysis
  10. GRB 050713B: Swift-BAT Refined Analysis
  11. Swift-BAT Trigger 145729 is not a GRB
  12. GRB 050713A: Swift/UVOT observation
  13. GRB 050713A : Swift-BAT Refined Analysis
  14. GRB050712: Swift UVOT Observation of Afterglow Emission
  15. GRB 050713A XMM-Newton observation
  16. GRB050713B: Faulkes North Telescope observation
  17. RBO RI observations of GRB 050713A
  18. GRB 050713B
  19. GRB050713: Liverpool Telescope prompt observations
  20. GRB050709: Candidate X-ray Afterglow from Chandra
  21. GRB 050713, R-band observations at NOT
  22. GRB 050713: Swift detection of Bright Burst
  23. GRB 050713A: ROTSE-III Optical Limits
  24. GRB050712: XRT refined analysis
  25. GRB 050709: Swift UVOT and XRT observations
  26. GRB 050712: Swift-BAT Refined Analysis
  27. GRB050712: UVOT candidate optical counterpart
  28. GRB 050712: Swift XRT afterglow position
  29. GRB 050712: Swift detection of a weak burst
  30. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  31. GRB 050626: Swift XRT observations
  32. GRB 050701
  33. GRB 050701, optical observations
  34. GRB 050701: Refined XRT analysis
  35. Swift UVOT observations of GRB 050701
  36. GRB050701: Swift-BAT Refined analysis
  37. GRB 050701: Swift XRT afterglow position
  38. Swift trigger 143708 is really GRB 050701
  39. GRB 050525A: Swift Late-Time Decay Rate
  40. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  41. GRB 050416(a): Host Galaxy Redshift Determination
  42. Swift/UVOT observations of GRB050607
  43. GRB 050607: RAPTOR-S Early Optical Limits
  44. GRB050607: KAIT optical limits
  45. GRB 050607: MDM Observations
  46. GRB050607,optical observation
  47. GRB 050607 - XRT refined data analysis
  48. GRB050607 optical limit by "Pi of the Sky"
  49. GRB050607: Swift Detection of a long GRB
  50. GRB 050603 - XRT data analysis of the first day
  51. Konus-Wind observation of GRB 050603
  52. GRB 050603: Analysis of UVOT data
  53. GRB050603: Fading Afterglow observed by Swift UVOT
  54. GRB 050603: Swift XRT Position
  55. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  56. Swift/BAT Detection of GRB050603
  57. GRB 050408: jet break in the XRT light curve
  58. GRB050528, XRT observations
  59. Correction to GCN Circ 3502 on GRB 050528
  60. Swift-BAT GRB 050528: a soft burst
  61. Update on Swift-BAT GRB 050528 (Trigger 130679)
  62. Possible GRB050528: no candidate from Liverpool Telescope
  63. Swift-BAT detection of possible GRB 050528
  64. GRB 050509b: refined XRT/Chandra afterglow position analysis
  65. GRB050525a: optical upper limits
  66. GRB 050525B: Swift-BAT observations
  67. GRB050525A,optical observation
  68. GRB050525: Super-LOTIS observations
  69. GRB 050525, spectral lag pseudo-redshift
  70. GRB050306: optical afterglow not confirmed
  71. GRB 050525A: BOOTES simultaneous optical observations
  72. GRB 050525A: Swift-BAT refined analysis
  73. Swift/UVOT UV and optical detections of GRB 050525
  74. Konus-Wind observation of GRB 050525
  75. GRB 050525: TAROT observations of the early afterglow
  76. INTEGRAL detection of GRB 050525
  77. GRB 050525: Optical observation
  78. GRB050525: ROTSE-III Refined Analysis
  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. XRF 050522: Swift XRT refined analysis
  83. Swift/UVOT observation of XRF 050522
  84. GRB 050509A: Further I-band imaging
  85. RBO Observations of GRB050522
  86. XRF 050522: Swift XRT observation
  87. GRB 050520: VLT/ULTRACAM observations
  88. Swift UVOT Observations of GRB 050520
  89. GRB 050520: Swift XRT refined analysis
  90. XRF050509C: Chandra Afterglow Detection
  91. XRF 050509c: Swift XRT Upper Limit
  92. RBO Observations of GRB050520
  93. GRB 050520: TAROT optical limit
  94. GRB 050520: Swift XRT position
  95. No Swift-BAT Lightcurves in real-time for next 3 weeks
  96. Swift-BAT trigger 122203 is not a real GRB
  97. GRB 050504: Swift XRT afterglow candidate has faded
  98. GRB 050509B: Subaru Optical Observations
  99. GRB050502b: Early Observation
  100. Refined Chandra analysis of GRB 050509b

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