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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"

19530 results found.

  1. GRB 051211B: Swift XRT Observations
  2. GRB 051210: Swift/UVOT upper limits
  3. GRB 051211: Swift XRT upper limit
  4. GRB 051210: SALT detection limit
  5. GRB 051210: BAT further refined analysis of the short burst
  6. GRB 051210: Swift XRT refined analysis
  7. GRB 051210: Swift-BAT refined analysis of a short burst
  8. GRB051210: Swift UVOT Observation
  9. GRB 051210: Swift detection of a burst
  10. IPN observations of SGR1806-20
  11. Swift XRT positions
  12. An extraordinary long burst on December 3 from SGR1806-20
  13. Swift UVOT Calibration Documentation
  14. Swift-BAT trigger 165579 is not a GRB
  15. GRB 051127: Swift-BAT detection of a possible burst
  16. GRB051117B: Swift XRT refined analysis
  17. GRB051117b: No Swift/UVOT Detection
  18. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  19. GRB 051117A: Swift/UVOT Detection of an Afterglow
  20. GRB051111: Rc optical observations
  21. GRB051008: Suzaku WAM observation of the prompt emission
  22. GRB 051117B: MARGE Optical Limits
  23. GRB 051117B: R and I observations of possible host galaxy
  24. GRB 051117A: Refined analysis of the Swift-BAT burst
  25. GRB 051117B: Refined analysis of the Swift-BAT burst
  26. GRB051117A : XRT refined analysis
  27. GRB 051117B,optical observation
  28. GRB 051117B: Lulin R and I band observation
  29. GRB 051117B: Optical observations
  30. GRB 051117B: ROTSE-III Optical Limits
  31. GRB051117B: Swift XRT position
  32. GRB 051117B: Swift detection of a burst
  33. GRB 051117: Swift detection of a bright burst
  34. GRB051114: results of the Swift-XRT observation
  35. GRB 051114: Swift-BAT refined analysis
  36. GRB050925: analysis of the XMM-Newton observation
  37. GRB 051114: Swift-BAT detection of a short burst
  38. GRB 051113: Swift-BAT refined analysis
  39. GRB 051113: Swift-BAT detection of a burst
  40. GRB 051111: AEOS optical observations
  41. GRB 051109A Milagro GeV/TeV Observations
  42. GRB/SGR 050925: XMM-Newton ToO observation
  43. GRB051111: Swift/UVOT Observations
  44. GRB051111: XRT preliminary analysis
  45. GRB 051111: Swift-BAT refined analysis
  46. GRB 051109A Optical Observations
  47. GRB051111a: SARA Observations
  48. GRB 051111A: KAIT optical observations
  49. GRB051111: Super-LOTIS Early Detection
  50. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  51. Faulkes Telescope R-band detection of GRB051111
  52. GRB051111: Swift-BAT detection of a bright burst
  53. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  54. Early RAPTOR measurements of GRB 051109a - the movie.
  55. Konus-Wind observation of GRB 051109A
  56. GRB 051109B: Swift-BAT refined analysis
  57. GRB 051109B: ROTSE-III Optical Limits
  58. GRB 051109A: Swift-UVOT Observations
  59. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  60. GRB051109B: no UVOT source detected
  61. GRB051109B: XRT refined analysis
  62. GRB 051109B : Lulin Optical Observations
  63. GRB051109A: further steepening in the X-ray light curve
  64. GRB051109A: XRT refined analysis
  65. GRB051109B: XRT position
  66. GRB 051109B: Super-LOTIS Observations
  67. GRB 051109B Kiso optical follow-up observation
  68. GRB 051109B: Swift detection of a burst
  69. GRB051109: Early Super-LOTIS Detection
  70. GRB 051109: Swift-BAT refined analysis
  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. GRB051028: Swift-XRT refined analysis
  79. GRB 051105a: MDM Observations
  80. GRB051105A: Swift/UVOT Observations
  81. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  82. XRT observations of GRB 051105A
  83. GRB 051105: Swift-BAT improved refined analysis
  84. GRB 051105: Swift-BAT refined analysis
  85. GRB 051105: Swift detection of a short burst
  86. GRB051028: Swift/UVOT upper limits
  87. GRB051028: Swift XRT Position
  88. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  89. GRB051022: Swift XRT measurement of jet break
  90. GRB051021B: Swift/UVOT Upper limits
  91. GRB 051022: XRT Refined Spectral and Temporal Analysis
  92. GRB051012: Swift-XRT analysis
  93. GRB051021B: Swift XRT refined analysis
  94. GRB 051022: WSRT Radio Detection
  95. GRB 051022: Swift/UVOT Upper Limits
  96. GRB051021A: Swift XRT refined analysis
  97. GRB051022: Optical Observations
  98. GRB 051022, J & K-band observation
  99. GRB051022: Swift XRT Position
  100. GRB051021: Swift/UVOT Upper Limits

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