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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"

20415 results found.

  1. GRB051103: Radio Observations
  2. GRB 051109A Milagro GeV/TeV Observations
  3. GRB051111: Swift/UVOT Observations
  4. GRB051111: XRT preliminary analysis
  5. GRB 051109A Optical Observations
  6. GRB 051111a: IR photometry
  7. GRB 051103 Milagro GeV/TeV Observations
  8. GRB 051109B. Radio Observations
  9. GRB 051109A
  10. GRB051109A - radio observations
  11. GRB 051109A: Swift-UVOT Observations
  12. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  13. GRB051109B: no UVOT source detected
  14. GRB051109B: XRT position
  15. GRB 051109B: Super-LOTIS Observations
  16. GRB051105B: REM Optical observation
  17. GRB 051109: Rc and Ic observations
  18. GRB 051109a: IR Photometry and Astrometry
  19. GRB051109: Swift detection of a burst
  20. GRB 051109a: IR Detections
  21. GRB051105B: Swift/XRT upper limit
  22. GRB051105B: Swift/UVOT upper limit
  23. GRB051103: MASTER: OT limit and host galaxy candidates
  24. GRB 051105a, observation from Naini Tal and OSN
  25. GRB 051105a: MDM Observations
  26. GRB 051105A: TNG optical observations
  27. GRB051105A: Swift/UVOT Observations
  28. GRB 051105A, radio observations
  29. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  30. XRT observations of GRB 051105A
  31. GRB 051105: Swift detection of a short burst
  32. Recent GRB UBVRcIc field photometry
  33. GRB051028 SARA Observation
  34. GRB051028: Swift/UVOT upper limits
  35. GRB051028: Swift XRT Position
  36. GRB051028:MASTER observations
  37. GRB051022: Swift XRT measurement of jet break
  38. GRB051021B: Swift/UVOT Upper limits
  39. GRB 051021, Optical Observations
  40. GRB051012: Swift-XRT analysis
  41. GRB 051022, mm counterpart
  42. GRB 051022: Swift/UVOT Upper Limits
  43. GRB051022: Radio Counterpart
  44. GRB051022: IR observations
  45. GRB051021A: Swift XRT refined analysis
  46. Konus-Wind observation of GRB 051022
  47. GRB051022: Optical Observations
  48. GRB051021b: Magellan IR Imaging
  49. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  50. GRB051022: Swift XRT Position
  51. GRB 051021: P200 Ks Observations
  52. GRB 051022 (=H3950): SXC Flight Localization is Valid
  53. GRB051021: Swift/UVOT Upper Limits
  54. GRB 051022: SSO40 Optical Observations
  55. GRB051022,optical observation
  56. GRB 051021,optical observation
  57. GRB051021B: Swift XRT Position
  58. GRB 051021B: Swift detection of a burst
  59. GRB051021: Swift XRT analysis
  60. Swift-BAT triggered on a posible CR Shower or possible GRB
  61. Afterglow candidate of GRB 051016B observed at Lulin
  62. GRB 051016b: Gemini Near IR Observations
  63. GRB 051016A: Swift/UVOT upper limits
  64. GRB 051016B: Swift/UVOT detection
  65. GRB 051016B,optical observation
  66. GRB 051016B: Swift detection of a soft burst
  67. GRB051016 XMM-Newton observation
  68. GRB 051016: PROMPT Observations
  69. GRB051016: Swift detection of a burst
  70. GRB 051012: Swift-BAT detection of burst yesterday
  71. GRB 051006: Swift/UVOT Upper Limits
  72. Konus-Wind observation of GRB 051008
  73. GRB051008: Radio Observation
  74. GRB 051008, optical observations
  75. GRB 051008: early Swift XRT analysis
  76. GRB 051008: Swift UVOT Candidate
  77. GRB051008: Swift-BAT detection of a bright burst
  78. GRB 051006: P60 Observations
  79. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  80. GRB051006: Swift detection of a burst
  81. GRB 050906, summary of radio observations
  82. GRB051001: Swift UVOT Upper Limits
  83. GRB 051001: AAT infra-red observations
  84. GRB 051001: Swift Detection of a Burst
  85. GRB 050820A: NIR photometry at the TNG
  86. GRB/SGR 050925: IR Observations
  87. GRB050925: Swift UVOT upper limits
  88. GRB050925: Faulkes Telescope North R-band limit
  89. GRB050925: Swift-BAT detection of a short burst
  90. GRB050922B: refined XRT analysis
  91. GRB050922B: Swift UVOT early upper limits.
  92. GRB 050922C: optical obserations
  93. GRB 050922C: NOT optical observations
  94. GRB 050922C: Swift detection of a bright burst
  95. GRB 050922B: ROTSE-III Optical Limits
  96. GRB 050922B,optical observation
  97. GRB050922B: Swift-BAT detection of a weak long burst
  98. GRB050820B: analysis of the XMM-Newton observation
  99. GRB050916: Swift/UVOT Upper Limits
  100. Swift-BAT trigger 155764 is not a GRB

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