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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"

19662 results found.

  1. GRB 051221A: Chandra Afterglow Position
  2. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  3. GRB 051221B: ROTSE-III Optical Limits
  4. GRB 051221B: TAROT optical limits
  5. GRB 051221A: WSRT Radio Observations
  6. GRB 051221B: Refined analysis of the Swift-BAT burst
  7. Possible GRB 051221B: MDM Optical Detection
  8. GRB 051221A: RAPTOR Fading Counterpart Constraint
  9. GRB 051221B: BOOTES optical observations.
  10. Possible GRB 051221B: Swift XRT position
  11. Swift-BAT detection of a possible burst
  12. GRB 051221: Swift XRT refined analysis
  13. GRB 051221: Swift/UVOT upper limits
  14. GRB 051221: XRT position
  15. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  16. GRB 051221: Swift detection of a bright short burst
  17. Refined analysis of the SWIFT J1626.6-5156
  18. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  19. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  20. GRB 051211B: optical afterglow
  21. Swift detection of an RS CVn flare star
  22. Swift Trigger 172767 is not a GRB
  23. GRB 051215: Swift detection of a possible burst
  24. GRB 051215: A short GRB in a cluster?
  25. GRB 051213: Swift-BAT refined analysis
  26. GRB051211B: XRT refined analysis
  27. GRB 051213: Swift-BAT detection of a burst
  28. GRB 051211A: Swift/UVOT upper limits
  29. GRB 051211B: Swift/UVOT upper limits - correction
  30. GRB 051211B: Swift/UVOT upper limits
  31. GRB 051211B: Swift XRT confirmation of the afterglow
  32. GRB051211B: Liverpool Telescope observation
  33. GRB 051211B: Swift XRT Observations
  34. GRB 051210: Swift/UVOT upper limits
  35. GRB 051211: Swift XRT upper limit
  36. GRB 051210: SALT detection limit
  37. GRB 051210: BAT further refined analysis of the short burst
  38. GRB 051210: Swift XRT refined analysis
  39. GRB 051210: Swift-BAT refined analysis of a short burst
  40. GRB051210: Swift UVOT Observation
  41. GRB 051210: Swift detection of a burst
  42. IPN observations of SGR1806-20
  43. Swift XRT positions
  44. An extraordinary long burst on December 3 from SGR1806-20
  45. Swift UVOT Calibration Documentation
  46. Swift-BAT trigger 165579 is not a GRB
  47. GRB 051127: Swift-BAT detection of a possible burst
  48. GRB051117B: Swift XRT refined analysis
  49. GRB051117b: No Swift/UVOT Detection
  50. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  51. GRB 051117A: Swift/UVOT Detection of an Afterglow
  52. GRB051111: Rc optical observations
  53. GRB051008: Suzaku WAM observation of the prompt emission
  54. GRB 051117B: MARGE Optical Limits
  55. GRB 051117B: R and I observations of possible host galaxy
  56. GRB 051117A: Refined analysis of the Swift-BAT burst
  57. GRB 051117B: Refined analysis of the Swift-BAT burst
  58. GRB051117A : XRT refined analysis
  59. GRB 051117B,optical observation
  60. GRB 051117B: Lulin R and I band observation
  61. GRB 051117B: Optical observations
  62. GRB 051117B: ROTSE-III Optical Limits
  63. GRB051117B: Swift XRT position
  64. GRB 051117B: Swift detection of a burst
  65. GRB 051117: Swift detection of a bright burst
  66. GRB051114: results of the Swift-XRT observation
  67. GRB 051114: Swift-BAT refined analysis
  68. GRB050925: analysis of the XMM-Newton observation
  69. GRB 051114: Swift-BAT detection of a short burst
  70. GRB 051113: Swift-BAT refined analysis
  71. GRB 051113: Swift-BAT detection of a burst
  72. GRB 051111: AEOS optical observations
  73. GRB 051109A Milagro GeV/TeV Observations
  74. GRB/SGR 050925: XMM-Newton ToO observation
  75. GRB051111: Swift/UVOT Observations
  76. GRB051111: XRT preliminary analysis
  77. GRB 051111: Swift-BAT refined analysis
  78. GRB 051109A Optical Observations
  79. GRB051111a: SARA Observations
  80. GRB 051111A: KAIT optical observations
  81. GRB051111: Super-LOTIS Early Detection
  82. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  83. Faulkes Telescope R-band detection of GRB051111
  84. GRB051111: Swift-BAT detection of a bright burst
  85. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  86. Early RAPTOR measurements of GRB 051109a - the movie.
  87. Konus-Wind observation of GRB 051109A
  88. GRB 051109B: Swift-BAT refined analysis
  89. GRB 051109B: ROTSE-III Optical Limits
  90. GRB 051109A: Swift-UVOT Observations
  91. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  92. GRB051109B: no UVOT source detected
  93. GRB051109B: XRT refined analysis
  94. GRB 051109B : Lulin Optical Observations
  95. GRB051109A: further steepening in the X-ray light curve
  96. GRB051109A: XRT refined analysis
  97. GRB051109B: XRT position
  98. GRB 051109B: Super-LOTIS Observations
  99. GRB 051109B Kiso optical follow-up observation
  100. GRB 051109B: Swift detection of a burst

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