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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"
  1. GRB051008: Suzaku WAM observation of the prompt emission
  2. GRB 051109B: GAO 150cm telescope Optical limit
  3. GRB 051109A : GAO 150cm telescope Rc-band detection
  4. GRB 051021 Optical Observations
  5. GRB 051117B: MARGE Optical Limits
  6. GRB 051117A and B: Radio Observations
  7. GRB 051117B: R and I observations of possible host galaxy
  8. GRB 051117b: NIR observations
  9. GRB 051117A: Refined analysis of the Swift-BAT burst
  10. GRB 051117B: Refined analysis of the Swift-BAT burst
  11. GRB051117A : XRT refined analysis
  12. GRB 051117B,optical observation
  13. GRB 051117B: Lulin R and I band observation
  14. GRB 051117B: Optical observations
  15. GRB 051117B: ROTSE-III Optical Limits
  16. GRB051117B: Swift XRT position
  17. GRB 051117B: Swift detection of a burst
  18. GRB 051117: Swift detection of a bright burst
  19. GRB051114: results of the Swift-XRT observation
  20. GRB 051028 Optical Observations
  21. GRB 051109B : Nainital upper limits
  22. GRB 051114: Radio Observations
  23. GRB 051114: Swift-BAT refined analysis
  24. GRB050925: analysis of the XMM-Newton observation
  25. GRB051109A optical observations
  26. GRB 051114: Swift-BAT detection of a short burst
  27. GRB 051111: Further spectroscopic analysis
  28. GRB 051111: Radio afterglow
  29. GRB 051113: Swift-BAT refined analysis
  30. GRB 051113: Swift-BAT detection of a burst
  31. GRB 051111: AEOS optical observations
  32. GRB051103: Radio Observations
  33. GRB 051109A Milagro GeV/TeV Observations
  34. GRB/SGR 050925: XMM-Newton ToO observation
  35. GRB051111: Swift/UVOT Observations
  36. GRB 051111A : R-band temporal decay index based on Lulin
  37. GRB051111: XRT preliminary analysis
  38. GRB 051111: Swift-BAT refined analysis
  39. GRB 051109A Optical Observations
  40. GRB 051111A : Lulin BVRI multi band afterglow observation
  41. GRB051111a: SARA Observations
  42. GRB 051111a: IR photometry
  43. GRB 051111: Keck HIRES redshift
  44. GRB 051111A: KAIT optical observations
  45. GRB 051111a: Afterglow fading in Ic
  46. GRB051111: Super-LOTIS Early Detection
  47. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  48. Faulkes Telescope R-band detection of GRB051111
  49. GRB 051103 Milagro GeV/TeV Observations
  50. GRB051111: Swift-BAT detection of a bright burst
  51. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  52. GRB 051008 Tautenburg Supernova Search
  53. GRB 051109B. Radio Observations
  54. GRB 051109A
  55. GRB051109A - radio observations
  56. GRB 051105a: GETS optical limit
  57. GRB 051109b: GETS observation
  58. GRB 051109A: KAIT optical observations
  59. Early RAPTOR measurements of GRB 051109a - the movie.
  60. Konus-Wind observation of GRB 051109A
  61. GRB 051109B: Swift-BAT refined analysis
  62. GRB 051109B: ROTSE-III Optical Limits
  63. GRB 051109A: Swift-UVOT Observations
  64. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  65. GRB051109B: no UVOT source detected
  66. GRB051109B: XRT refined analysis
  67. GRB 051109B : Lulin Optical Observations
  68. GRB 051109A : Lulin BVRI Optical afterglow observation
  69. GRB051109A: further steepening in the X-ray light curve
  70. GRB051109A: XRT refined analysis
  71. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  72. GRB051109B: XRT position
  73. GRB 051109B: Super-LOTIS Observations
  74. GRB 051109B Kiso optical follow-up observation
  75. GRB051105B: REM Optical observation
  76. GRB 051109B: Swift detection of a burst
  77. GRB 051109: HET Optical Spectrum and Absorption Redshift
  78. GRB 051109: PROMPT Detections
  79. GRB 051109: Rc and Ic observations
  80. GRB051109: Early Super-LOTIS Detection
  81. GRB 051109: Swift-BAT refined analysis
  82. GRB 051109a: IR Photometry and Astrometry
  83. GRB 051109a: MDM Observations
  84. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  85. GRB051109: Swift detection of a burst
  86. GRB 051109a: IR Detections
  87. GRB 051109: ROTSE-III Detection of Possible Counterpart
  88. GRB051105B: Swift/XRT upper limit
  89. GRB051105B: Swift/UVOT upper limit
  90. GRB051103: optical observations
  91. GRB 051103, optical observations
  92. GRB051103: MASTER: OT limit and host galaxy candidates
  93. GRB051028: Swift-XRT refined analysis
  94. GRB 051105a, observation from Naini Tal and OSN
  95. GRB 051105A, 2nd epoch optical observations
  96. GRB 051105a: MDM Observations
  97. GRB 051105A: TNG optical observations
  98. GRB051105A: Swift/UVOT Observations
  99. GRB 051105A, radio observations
  100. GRB051103:_MASTER_optical_observations

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