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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"

42888 results found.

  1. GRB 051210: SALT detection limit
  2. GRB 051210: BAT further refined analysis of the short burst
  3. GRB 051210: Swift XRT refined analysis
  4. GRB 051210: Swift-BAT refined analysis of a short burst
  5. GRB 051210: A short GRB in a cluster?
  6. GRB 051210: Swift detection of a burst
  7. IPN observations of SGR1806-20
  8. Swift XRT positions
  9. An extraordinary long burst on December 3 from SGR1806-20
  10. IBAS Alert 2706 : not a real GRB
  11. Possible resuming of the SGR 1806-20 activity
  12. Swift UVOT Calibration Documentation
  13. GRB051111: optical observaion
  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: Suzaku WAM observation of the prompt emission
  21. GRB051111: Rc optical observations
  22. GRB051008: Suzaku WAM observation of the prompt emission
  23. GRB 051109A : GAO 150cm telescope Rc-band detection
  24. GRB 051021 Optical Observations
  25. GRB 051117B: MARGE Optical Limits
  26. GRB 051117A and B: Radio Observations
  27. GRB 051117B: R and I observations of possible host galaxy
  28. GRB 051117b: NIR observations
  29. GRB 051117A: Refined analysis of the Swift-BAT burst
  30. GRB 051117B: Refined analysis of the Swift-BAT burst
  31. GRB051117A : XRT refined analysis
  32. GRB 051117B,optical observation
  33. GRB 051117B: Lulin R and I band observation
  34. GRB 051117B: Optical observations
  35. GRB051117B: Swift XRT position
  36. GRB 051117B: Swift detection of a burst
  37. GRB 051117: Swift detection of a bright burst
  38. GRB051114: results of the Swift-XRT observation
  39. GRB 051028 Optical Observations
  40. GRB 051109B : Nainital upper limits
  41. GRB 051114: Radio Observations
  42. GRB 051114: Swift-BAT refined analysis
  43. GRB050925: analysis of the XMM-Newton observation
  44. GRB051109A optical observations
  45. GRB 051114: Swift-BAT detection of a short burst
  46. GRB 051111: Further spectroscopic analysis
  47. GRB 051111: Radio afterglow
  48. GRB 051113: Swift-BAT refined analysis
  49. GRB 051113: Swift-BAT detection of a burst
  50. GRB 051111: AEOS optical observations
  51. GRB051103: Radio Observations
  52. GRB 051109A Milagro GeV/TeV Observations
  53. GRB/SGR 050925: XMM-Newton ToO observation
  54. GRB051111: Swift/UVOT Observations
  55. GRB051111: XRT preliminary analysis
  56. GRB 051111: Swift-BAT refined analysis
  57. GRB 051109A Optical Observations
  58. GRB051111a: SARA Observations
  59. GRB 051111a: IR photometry
  60. GRB 051111: Keck HIRES redshift
  61. GRB 051111A: KAIT optical observations
  62. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  63. Faulkes Telescope R-band detection of GRB051111
  64. GRB 051103 Milagro GeV/TeV Observations
  65. GRB051111: Swift-BAT detection of a bright burst
  66. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  67. GRB 051008 Tautenburg Supernova Search
  68. GRB 051109B. Radio Observations
  69. GRB 051109A
  70. GRB 051105a: GETS optical limit
  71. GRB 051109b: GETS observation
  72. GRB 051109A: KAIT optical observations
  73. Early RAPTOR measurements of GRB 051109a - the movie.
  74. Konus-Wind observation of GRB 051109A
  75. GRB 051109B: Swift-BAT refined analysis
  76. GRB 051109A: Swift-UVOT Observations
  77. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  78. GRB051109B: no UVOT source detected
  79. GRB051109B: XRT refined analysis
  80. GRB051109A: further steepening in the X-ray light curve
  81. GRB051109A: XRT refined analysis
  82. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  83. GRB051109B: XRT position
  84. GRB 051109B: Super-LOTIS Observations
  85. GRB051105B: REM Optical observation
  86. GRB 051109B: Swift detection of a burst
  87. GRB 051109: HET Optical Spectrum and Absorption Redshift
  88. GRB 051109: PROMPT Detections
  89. GRB 051109: Rc and Ic observations
  90. GRB051109: Early Super-LOTIS Detection
  91. GRB 051109: Swift-BAT refined analysis
  92. GRB 051109a: IR Photometry and Astrometry
  93. GRB 051109a: MDM Observations
  94. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  95. GRB051109: Swift detection of a burst
  96. GRB 051109a: IR Detections
  97. GRB 051109: ROTSE-III Detection of Possible Counterpart
  98. GRB051105B: Swift/XRT upper limit
  99. GRB051105B: Swift/UVOT upper limit
  100. GRB051103: optical observations

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