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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

26055 results found.

  1. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  2. GRB 051221: Swift detection of a bright short burst
  3. Refined analysis of the SWIFT J1626.6-5156
  4. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  5. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  6. GRB 051211B: optical afterglow
  7. Swift detection of an RS CVn flare star
  8. GRB051211A: possible optical candidate
  9. Swift Trigger 172767 is not a GRB
  10. GRB 051215: Swift detection of a possible burst
  11. GRB 051215: A short GRB in a cluster?
  12. GRB051211B: Probable radio afterglow
  13. GRB051105: optical observations
  14. GRB 051213: Swift-BAT refined analysis
  15. GRB051211B: XRT refined analysis
  16. GRB 051213: Swift-BAT detection of a burst
  17. GRB 051211A: Swift/UVOT upper limits
  18. GRB 051211B: Swift/UVOT upper limits - correction
  19. GRB 051211B: Swift/UVOT upper limits
  20. GRB 051211B: Swift XRT confirmation of the afterglow
  21. GRB051211B: Liverpool Telescope observation
  22. GRB 051211b: RTT150 optical observations
  23. GRB051211b: P60 Observations
  24. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  25. GRB 051211B: Swift XRT Observations
  26. GRB 051210: Swift/UVOT upper limits
  27. GRB 051211B: a possible optical detection by TAROT
  28. GRB 051211: Swift XRT upper limit
  29. GRB 051210: Optical imaging from Las Campanas
  30. GRB 051210: SALT detection limit
  31. GRB 051210: BAT further refined analysis of the short burst
  32. GRB 051210: Swift XRT refined analysis
  33. GRB 051210: FRAM early limit
  34. GRB 051210: Swift-BAT refined analysis of a short burst
  35. GRB051210: Swift UVOT Observation
  36. GRB 051210: A short GRB in a cluster?
  37. GRB 051210: Swift detection of a burst
  38. IPN observations of SGR1806-20
  39. Swift XRT positions
  40. An extraordinary long burst on December 3 from SGR1806-20
  41. Swift UVOT Calibration Documentation
  42. GRB051117B: optical observation
  43. Swift-BAT trigger 165579 is not a GRB
  44. GRB 051127: Swift-BAT detection of a possible burst
  45. GRB051117B: Swift XRT refined analysis
  46. GRB051117b: No Swift/UVOT Detection
  47. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  48. GRB 051117A: Swift/UVOT Detection of an Afterglow
  49. GRB051111: Rc optical observations
  50. GRB051008: Suzaku WAM observation of the prompt emission
  51. GRB 051109B: GAO 150cm telescope Optical limit
  52. GRB 051109A : GAO 150cm telescope Rc-band detection
  53. GRB 051117B: MARGE Optical Limits
  54. GRB 051117A and B: Radio Observations
  55. GRB 051117B: R and I observations of possible host galaxy
  56. GRB 051117b: NIR observations
  57. GRB 051117A: Refined analysis of the Swift-BAT burst
  58. GRB 051117B: Refined analysis of the Swift-BAT burst
  59. GRB051117A : XRT refined analysis
  60. GRB 051117B,optical observation
  61. GRB 051117B: Lulin R and I band observation
  62. GRB 051117B: Optical observations
  63. GRB 051117B: ROTSE-III Optical Limits
  64. GRB051117B: Swift XRT position
  65. GRB 051117B: Swift detection of a burst
  66. GRB 051117: Swift detection of a bright burst
  67. GRB051114: results of the Swift-XRT observation
  68. GRB 051109B : Nainital upper limits
  69. GRB 051114: Swift-BAT refined analysis
  70. GRB050925: analysis of the XMM-Newton observation
  71. GRB051109A optical observations
  72. GRB 051114: Swift-BAT detection of a short burst
  73. GRB 051111: Radio afterglow
  74. GRB 051113: Swift-BAT refined analysis
  75. GRB 051113: Swift-BAT detection of a burst
  76. GRB 051111: AEOS optical observations
  77. GRB 051109A Milagro GeV/TeV Observations
  78. GRB/SGR 050925: XMM-Newton ToO observation
  79. GRB051111: Swift/UVOT Observations
  80. GRB 051111A : R-band temporal decay index based on Lulin
  81. GRB051111: XRT preliminary analysis
  82. GRB 051111: Swift-BAT refined analysis
  83. GRB 051109A Optical Observations
  84. GRB 051111A : Lulin BVRI multi band afterglow observation
  85. GRB051111a: SARA Observations
  86. GRB 051111A: KAIT optical observations
  87. GRB 051111a: Afterglow fading in Ic
  88. GRB051111: Super-LOTIS Early Detection
  89. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  90. Faulkes Telescope R-band detection of GRB051111
  91. GRB051111: Swift-BAT detection of a bright burst
  92. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  93. GRB 051008 Tautenburg Supernova Search
  94. GRB 051109B. Radio Observations
  95. GRB 051109A
  96. GRB 051109A: KAIT optical observations
  97. Early RAPTOR measurements of GRB 051109a - the movie.
  98. Konus-Wind observation of GRB 051109A
  99. GRB 051109B: Swift-BAT refined analysis
  100. GRB 051109B: ROTSE-III Optical Limits

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