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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').

18310 results found.

  1. GRB050714B: Refined analysis of the Swift-BAT burst
  2. Swift detection of a long transient (GRB 050714B?)
  3. GRB 050714: Swift XRT afterglow position
  4. GRB 050713A: XRT refined analysis
  5. GRB 050713A: RAPTOR detection of early optical emission
  6. GRB050713B :Swift/UVOT observations
  7. GRB050713b: XRT refined analysis
  8. GRB 050713B: Swift-BAT Refined Analysis
  9. Swift-BAT Trigger 145729 is not a GRB
  10. GRB 050713A: Swift/UVOT observation
  11. GRB 050713A : Swift-BAT Refined Analysis
  12. GRB050712: Swift UVOT Observation of Afterglow Emission
  13. GRB 050713A XMM-Newton observation
  14. GRB050713B: Faulkes North Telescope observation
  15. RBO RI observations of GRB 050713A
  16. GRB 050713B
  17. GRB050713: Liverpool Telescope prompt observations
  18. GRB050709: Candidate X-ray Afterglow from Chandra
  19. GRB 050713, R-band observations at NOT
  20. GRB 050713: Swift detection of Bright Burst
  21. GRB 050713A: ROTSE-III Optical Limits
  22. GRB050712: XRT refined analysis
  23. GRB 050709: Swift UVOT and XRT observations
  24. GRB 050712: Swift-BAT Refined Analysis
  25. GRB050712: UVOT candidate optical counterpart
  26. GRB 050712: Swift XRT afterglow position
  27. GRB 050712: Swift detection of a weak burst
  28. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  29. GRB 050626: Swift XRT observations
  30. GRB 050701
  31. GRB 050701, optical observations
  32. GRB 050701: Refined XRT analysis
  33. Swift UVOT observations of GRB 050701
  34. GRB050701: Swift-BAT Refined analysis
  35. GRB 050701: Swift XRT afterglow position
  36. Swift trigger 143708 is really GRB 050701
  37. GRB 050525A: Swift Late-Time Decay Rate
  38. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  39. GRB 050416(a): Host Galaxy Redshift Determination
  40. Swift/UVOT observations of GRB050607
  41. GRB 050607: RAPTOR-S Early Optical Limits
  42. GRB050607: KAIT optical limits
  43. GRB 050607: MDM Observations
  44. GRB050607,optical observation
  45. GRB 050607 - XRT refined data analysis
  46. GRB050607 optical limit by "Pi of the Sky"
  47. GRB050607: Swift Detection of a long GRB
  48. GRB 050603 - XRT data analysis of the first day
  49. Konus-Wind observation of GRB 050603
  50. GRB 050603: Analysis of UVOT data
  51. GRB050603: Fading Afterglow observed by Swift UVOT
  52. GRB 050603: Swift XRT Position
  53. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  54. Swift/BAT Detection of GRB050603
  55. GRB 050408: jet break in the XRT light curve
  56. GRB050528, XRT observations
  57. Correction to GCN Circ 3502 on GRB 050528
  58. Swift-BAT GRB 050528: a soft burst
  59. Update on Swift-BAT GRB 050528 (Trigger 130679)
  60. Possible GRB050528: no candidate from Liverpool Telescope
  61. Swift-BAT detection of possible GRB 050528
  62. GRB 050509b: refined XRT/Chandra afterglow position analysis
  63. GRB050525a: optical upper limits
  64. GRB 050525B: Swift-BAT observations
  65. GRB050525A,optical observation
  66. GRB050525: Super-LOTIS observations
  67. GRB 050525, spectral lag pseudo-redshift
  68. GRB050306: optical afterglow not confirmed
  69. GRB 050525A: BOOTES simultaneous optical observations
  70. GRB 050525A: Swift-BAT refined analysis
  71. Swift/UVOT UV and optical detections of GRB 050525
  72. Konus-Wind observation of GRB 050525
  73. GRB 050525: TAROT observations of the early afterglow
  74. INTEGRAL detection of GRB 050525
  75. GRB 050525: Optical observation
  76. GRB050525: ROTSE-III Refined Analysis
  77. GRB 050525 - Very Bright, Not Short
  78. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  79. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  80. XRF 050522: Swift XRT refined analysis
  81. Swift/UVOT observation of XRF 050522
  82. GRB 050509A: Further I-band imaging
  83. RBO Observations of GRB050522
  84. XRF 050522: Swift XRT observation
  85. GRB 050520: VLT/ULTRACAM observations
  86. Swift UVOT Observations of GRB 050520
  87. GRB 050520: Swift XRT refined analysis
  88. XRF050509C: Chandra Afterglow Detection
  89. XRF 050509c: Swift XRT Upper Limit
  90. RBO Observations of GRB050520
  91. GRB 050520: TAROT optical limit
  92. GRB 050520: Swift XRT position
  93. No Swift-BAT Lightcurves in real-time for next 3 weeks
  94. Swift-BAT trigger 122203 is not a real GRB
  95. GRB 050504: Swift XRT afterglow candidate has faded
  96. GRB 050509B: Subaru Optical Observations
  97. GRB050502b: Early Observation
  98. Refined Chandra analysis of GRB 050509b
  99. GRB050509b, SDSS pre-burst observations
  100. Chandra observation of GRB 050509b

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