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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').

18309 results found.

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

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