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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').
  1. GRB 051117B: Lulin R and I band observation
  2. GRB 051117B: Optical observations
  3. GRB 051117B: ROTSE-III Optical Limits
  4. GRB051117B: Swift XRT position
  5. GRB 051117B: Swift detection of a burst
  6. GRB 051117: Swift detection of a bright burst
  7. GRB051114: results of the Swift-XRT observation
  8. GRB 051028 Optical Observations
  9. GRB 051109B : Nainital upper limits
  10. GRB 051114: Radio Observations
  11. GRB 051114: Swift-BAT refined analysis
  12. GRB050925: analysis of the XMM-Newton observation
  13. GRB051109A optical observations
  14. GRB 051114: Swift-BAT detection of a short burst
  15. GRB 051111: Further spectroscopic analysis
  16. GRB 051111: Radio afterglow
  17. GRB 051113: Swift-BAT refined analysis
  18. GRB 051113: Swift-BAT detection of a burst
  19. GRB 051111: AEOS optical observations
  20. GRB051103: Radio Observations
  21. GRB 051109A Milagro GeV/TeV Observations
  22. GRB/SGR 050925: XMM-Newton ToO observation
  23. GRB051111: Swift/UVOT Observations
  24. GRB 051111A : R-band temporal decay index based on Lulin
  25. GRB051111: XRT preliminary analysis
  26. GRB 051111: Swift-BAT refined analysis
  27. GRB 051109A Optical Observations
  28. GRB 051111A : Lulin BVRI multi band afterglow observation
  29. GRB051111a: SARA Observations
  30. GRB 051111a: IR photometry
  31. GRB 051111: Keck HIRES redshift
  32. GRB 051111A: KAIT optical observations
  33. GRB 051111a: Afterglow fading in Ic
  34. GRB051111: Super-LOTIS Early Detection
  35. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  36. Faulkes Telescope R-band detection of GRB051111
  37. GRB 051103 Milagro GeV/TeV Observations
  38. GRB051111: Swift-BAT detection of a bright burst
  39. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  40. GRB 051008 Tautenburg Supernova Search
  41. GRB 051109B. Radio Observations
  42. GRB 051109A
  43. GRB051109A - radio observations
  44. GRB 051105a: GETS optical limit
  45. GRB 051109b: GETS observation
  46. GRB 051109A: KAIT optical observations
  47. Early RAPTOR measurements of GRB 051109a - the movie.
  48. Konus-Wind observation of GRB 051109A
  49. GRB 051109B: Swift-BAT refined analysis
  50. GRB 051109B: ROTSE-III Optical Limits
  51. GRB 051109A: Swift-UVOT Observations
  52. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  53. GRB051109B: no UVOT source detected
  54. GRB051109B: XRT refined analysis
  55. GRB 051109B : Lulin Optical Observations
  56. GRB 051109A : Lulin BVRI Optical afterglow observation
  57. GRB051109A: further steepening in the X-ray light curve
  58. GRB051109A: XRT refined analysis
  59. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  60. GRB051109B: XRT position
  61. GRB 051109B: Super-LOTIS Observations
  62. GRB 051109B Kiso optical follow-up observation
  63. GRB051105B: REM Optical observation
  64. GRB 051109B: Swift detection of a burst
  65. GRB 051109: HET Optical Spectrum and Absorption Redshift
  66. GRB 051109: PROMPT Detections
  67. GRB 051109: Rc and Ic observations
  68. GRB051109: Early Super-LOTIS Detection
  69. GRB 051109: Swift-BAT refined analysis
  70. GRB 051109a: IR Photometry and Astrometry
  71. GRB 051109a: MDM Observations
  72. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  73. GRB051109: Swift detection of a burst
  74. GRB 051109a: IR Detections
  75. GRB 051109: ROTSE-III Detection of Possible Counterpart
  76. GRB051105B: Swift/XRT upper limit
  77. GRB051105B: Swift/UVOT upper limit
  78. GRB051103: optical observations
  79. GRB 051103, optical observations
  80. GRB051103: MASTER: OT limit and host galaxy candidates
  81. GRB051028: Swift-XRT refined analysis
  82. GRB 051105a, observation from Naini Tal and OSN
  83. GRB 051105A, 2nd epoch optical observations
  84. GRB 051105a: MDM Observations
  85. GRB 051105A: TNG optical observations
  86. GRB051105A: Swift/UVOT Observations
  87. GRB 051105A, radio observations
  88. GRB051103:_MASTER_optical_observations
  89. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  90. GRB 051105A, optical observations
  91. XRT observations of GRB 051105A
  92. GRB 051105: Swift-BAT improved refined analysis
  93. GRB 051105b: ART optical limits
  94. GRB051105B - A long GRB detected by INTEGRAL
  95. GRB 051105B (INTEGRAL 2701): Optical observation
  96. GRB 051105: Swift-BAT refined analysis
  97. GRB 051105: Optical limit
  98. GRB 051105: Swift detection of a short burst
  99. IBAS Alert 2700: Not a GRB
  100. GRB 051016B host spectroscopy and redshift

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