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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"

19531 results found.

  1. GRB051211B: Liverpool Telescope observation
  2. GRB 051211B: Swift XRT Observations
  3. GRB 051210: Swift/UVOT upper limits
  4. GRB 051211: Swift XRT upper limit
  5. GRB 051210: SALT detection limit
  6. GRB 051210: BAT further refined analysis of the short burst
  7. GRB 051210: Swift XRT refined analysis
  8. GRB 051210: Swift-BAT refined analysis of a short burst
  9. GRB051210: Swift UVOT Observation
  10. GRB 051210: Swift detection of a burst
  11. IPN observations of SGR1806-20
  12. Swift XRT positions
  13. An extraordinary long burst on December 3 from SGR1806-20
  14. Swift UVOT Calibration Documentation
  15. Swift-BAT trigger 165579 is not a GRB
  16. GRB 051127: Swift-BAT detection of a possible burst
  17. GRB051117B: Swift XRT refined analysis
  18. GRB051117b: No Swift/UVOT Detection
  19. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  20. GRB 051117A: Swift/UVOT Detection of an Afterglow
  21. GRB051111: Rc optical observations
  22. GRB051008: Suzaku WAM observation of the prompt emission
  23. GRB 051117B: MARGE Optical Limits
  24. GRB 051117B: R and I observations of possible host galaxy
  25. GRB 051117A: Refined analysis of the Swift-BAT burst
  26. GRB 051117B: Refined analysis of the Swift-BAT burst
  27. GRB051117A : XRT refined analysis
  28. GRB 051117B,optical observation
  29. GRB 051117B: Lulin R and I band observation
  30. GRB 051117B: Optical observations
  31. GRB 051117B: ROTSE-III Optical Limits
  32. GRB051117B: Swift XRT position
  33. GRB 051117B: Swift detection of a burst
  34. GRB 051117: Swift detection of a bright burst
  35. GRB051114: results of the Swift-XRT observation
  36. GRB 051114: Swift-BAT refined analysis
  37. GRB050925: analysis of the XMM-Newton observation
  38. GRB 051114: Swift-BAT detection of a short burst
  39. GRB 051113: Swift-BAT refined analysis
  40. GRB 051113: Swift-BAT detection of a burst
  41. GRB 051111: AEOS optical observations
  42. GRB 051109A Milagro GeV/TeV Observations
  43. GRB/SGR 050925: XMM-Newton ToO observation
  44. GRB051111: Swift/UVOT Observations
  45. GRB051111: XRT preliminary analysis
  46. GRB 051111: Swift-BAT refined analysis
  47. GRB 051109A Optical Observations
  48. GRB051111a: SARA Observations
  49. GRB 051111A: KAIT optical observations
  50. GRB051111: Super-LOTIS Early Detection
  51. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  52. Faulkes Telescope R-band detection of GRB051111
  53. GRB051111: Swift-BAT detection of a bright burst
  54. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  55. Early RAPTOR measurements of GRB 051109a - the movie.
  56. Konus-Wind observation of GRB 051109A
  57. GRB 051109B: Swift-BAT refined analysis
  58. GRB 051109B: ROTSE-III Optical Limits
  59. GRB 051109A: Swift-UVOT Observations
  60. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  61. GRB051109B: no UVOT source detected
  62. GRB051109B: XRT refined analysis
  63. GRB 051109B : Lulin Optical Observations
  64. GRB051109A: further steepening in the X-ray light curve
  65. GRB051109A: XRT refined analysis
  66. GRB051109B: XRT position
  67. GRB 051109B: Super-LOTIS Observations
  68. GRB 051109B Kiso optical follow-up observation
  69. GRB 051109B: Swift detection of a burst
  70. GRB051109: Early Super-LOTIS Detection
  71. GRB 051109: Swift-BAT refined analysis
  72. GRB 051109a: MDM Observations
  73. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  74. GRB051109: Swift detection of a burst
  75. GRB 051109a: IR Detections
  76. GRB 051109: ROTSE-III Detection of Possible Counterpart
  77. GRB051105B: Swift/XRT upper limit
  78. GRB051105B: Swift/UVOT upper limit
  79. GRB051028: Swift-XRT refined analysis
  80. GRB 051105a: MDM Observations
  81. GRB051105A: Swift/UVOT Observations
  82. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  83. XRT observations of GRB 051105A
  84. GRB 051105: Swift-BAT improved refined analysis
  85. GRB 051105: Swift-BAT refined analysis
  86. GRB 051105: Swift detection of a short burst
  87. GRB051028: Swift/UVOT upper limits
  88. GRB051028: Swift XRT Position
  89. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  90. GRB051022: Swift XRT measurement of jet break
  91. GRB051021B: Swift/UVOT Upper limits
  92. GRB 051022: XRT Refined Spectral and Temporal Analysis
  93. GRB051012: Swift-XRT analysis
  94. GRB051021B: Swift XRT refined analysis
  95. GRB 051022: WSRT Radio Detection
  96. GRB 051022: Swift/UVOT Upper Limits
  97. GRB051021A: Swift XRT refined analysis
  98. GRB051022: Optical Observations
  99. GRB 051022, J & K-band observation
  100. GRB051022: Swift XRT Position

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