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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"

21451 results found.

  1. GRB 051210: Swift detection of a burst
  2. IPN observations of SGR1806-20
  3. Swift XRT positions
  4. An extraordinary long burst on December 3 from SGR1806-20
  5. Swift UVOT Calibration Documentation
  6. GRB051117B: optical observation
  7. Swift-BAT trigger 165579 is not a GRB
  8. GRB 051127: Swift-BAT detection of a possible burst
  9. GRB051117B: Swift XRT refined analysis
  10. GRB051117b: No Swift/UVOT Detection
  11. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  12. GRB 051117A: Swift/UVOT Detection of an Afterglow
  13. GRB051111: Rc optical observations
  14. GRB051008: Suzaku WAM observation of the prompt emission
  15. GRB 051117B: MARGE Optical Limits
  16. GRB 051117A and B: Radio Observations
  17. GRB 051117B: R and I observations of possible host galaxy
  18. GRB 051117b: NIR observations
  19. GRB 051117A: Refined analysis of the Swift-BAT burst
  20. GRB 051117B: Refined analysis of the Swift-BAT burst
  21. GRB051117A : XRT refined analysis
  22. GRB 051117B,optical observation
  23. GRB 051117B: Lulin R and I band observation
  24. GRB 051117B: Optical observations
  25. GRB 051117B: ROTSE-III Optical Limits
  26. GRB051117B: Swift XRT position
  27. GRB 051117B: Swift detection of a burst
  28. GRB 051117: Swift detection of a bright burst
  29. GRB051114: results of the Swift-XRT observation
  30. GRB 051109B : Nainital upper limits
  31. GRB 051114: Swift-BAT refined analysis
  32. GRB050925: analysis of the XMM-Newton observation
  33. GRB 051114: Swift-BAT detection of a short burst
  34. GRB 051113: Swift-BAT refined analysis
  35. GRB 051113: Swift-BAT detection of a burst
  36. GRB 051111: AEOS optical observations
  37. GRB 051109A Milagro GeV/TeV Observations
  38. GRB/SGR 050925: XMM-Newton ToO observation
  39. GRB051111: Swift/UVOT Observations
  40. GRB051111: XRT preliminary analysis
  41. GRB 051111: Swift-BAT refined analysis
  42. GRB 051109A Optical Observations
  43. GRB051111a: SARA Observations
  44. GRB 051111A: KAIT optical observations
  45. GRB051111: Super-LOTIS Early Detection
  46. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  47. Faulkes Telescope R-band detection of GRB051111
  48. GRB051111: Swift-BAT detection of a bright burst
  49. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  50. GRB 051008 Tautenburg Supernova Search
  51. GRB 051109B. Radio Observations
  52. Early RAPTOR measurements of GRB 051109a - the movie.
  53. Konus-Wind observation of GRB 051109A
  54. GRB 051109B: Swift-BAT refined analysis
  55. GRB 051109B: ROTSE-III Optical Limits
  56. GRB 051109A: Swift-UVOT Observations
  57. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  58. GRB051109B: no UVOT source detected
  59. GRB051109B: XRT refined analysis
  60. GRB 051109B : Lulin Optical Observations
  61. GRB051109A: further steepening in the X-ray light curve
  62. GRB051109A: XRT refined analysis
  63. GRB051109B: XRT position
  64. GRB 051109B: Super-LOTIS Observations
  65. GRB 051109B Kiso optical follow-up observation
  66. GRB 051109B: Swift detection of a burst
  67. GRB051109: Early Super-LOTIS Detection
  68. GRB 051109: Swift-BAT refined analysis
  69. GRB 051109a: MDM Observations
  70. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  71. GRB051109: Swift detection of a burst
  72. GRB 051109a: IR Detections
  73. GRB 051109: ROTSE-III Detection of Possible Counterpart
  74. GRB051105B: Swift/XRT upper limit
  75. GRB051105B: Swift/UVOT upper limit
  76. GRB051028: Swift-XRT refined analysis
  77. GRB 051105A, 2nd epoch optical observations
  78. GRB 051105a: MDM Observations
  79. GRB 051105A: TNG optical observations
  80. GRB051105A: Swift/UVOT Observations
  81. GRB 051105A, radio observations
  82. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  83. GRB 051105A, optical observations
  84. XRT observations of GRB 051105A
  85. GRB 051105: Swift-BAT improved refined analysis
  86. GRB 051105: Swift-BAT refined analysis
  87. GRB 051105: Swift detection of a short burst
  88. GRB 051022: RTT150 optical observations
  89. GRB051028: Swift/UVOT upper limits
  90. GRB051028: WHT optical candidate
  91. GRB051028: Swift XRT Position
  92. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  93. GRB051022: Swift XRT measurement of jet break
  94. GRB051021B: Swift/UVOT Upper limits
  95. GRB 051022: XRT Refined Spectral and Temporal Analysis
  96. GRB051012: Swift-XRT analysis
  97. GRB051021B: Swift XRT refined analysis
  98. GRB 051022: WSRT Radio Detection
  99. GRB051022: host galaxy redshift
  100. GRB 051022: Swift/UVOT Upper Limits

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