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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"

19536 results found.

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

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