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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"

43006 results found.

  1. GRB051028: optical observations
  2. GRB051028: Swift/UVOT upper limits
  3. GRB051028: confirmation of the afterglow
  4. GRB051028: WHT optical candidate
  5. GRB051028: Swift XRT Position
  6. GRB 051028 (=H3951): A GRB localized by HETE
  7. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  8. GRB051022: Swift XRT measurement of jet break
  9. SGR 1806-20: continued moderate activity seen with INTEGRAL
  10. GRB051021B: Swift/UVOT Upper limits
  11. GRB 051021, Optical Observations
  12. GRB 051022: XRT Refined Spectral and Temporal Analysis
  13. GRB 051022, refined optical astrometry
  14. Chandra Observations of GRB 051022
  15. GRB051012: Swift-XRT analysis
  16. GRB 051022 Chandra Observations scheduled
  17. GRB051021B: Swift XRT refined analysis
  18. GRB051021a: optical observations
  19. GRB 051022: WSRT Radio Detection
  20. GRB 051022, mm counterpart
  21. GRB051022: host galaxy redshift
  22. GRB051022: Radio Counterpart
  23. GRB 051022: SOAR JKs Observations
  24. GRB051021A: Swift XRT refined analysis
  25. Konus-Wind observation of GRB 051022
  26. GRB051022: Optical Observations
  27. GRB 051022: Magellan NIR imaging
  28. GRB 051021: PROMPT RcIc Observations
  29. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  30. GRB 051022, J & K-band observation
  31. GRB 051021, SMARTS optical/IR observations
  32. GRB 051021: P200 Ks Observations
  33. IPN triangulation of GRB051022 (=H3950)
  34. GRB 051021: MDM Upper Limit
  35. GRB 051022 (=H3950): SXC Flight Localization is Valid
  36. GRB 051022: SSO40 Optical Observations
  37. GRB 051022A: ROTSE-III Optical Limits
  38. GRB051022 (=H3590), A GRB Detected By HETE
  39. GRB 051022: Optical observations
  40. GRB 051021B: Swift detection of a burst
  41. GRB051021: Swift XRT analysis
  42. GRB051021 (=H3947): Refined Analysis
  43. GRB 051021: Optical observations
  44. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  45. GRB 051021: Optical observations and candidate afterglow
  46. GRB051021: A GRB Localized by HETE
  47. Swift-BAT trigger 160619 is not a GRB
  48. Swift-BAT triggered on a posible CR Shower or possible GRB
  49. GRB 050502b: Optical limit
  50. GRB 051016b: Optical limit
  51. GRB 051016b: Gemini Near IR Observations
  52. GRB 051016B: refined analysis of the Swift/XRT data
  53. GRB 051016B: Swift/UVOT detection
  54. GRB 051016B: Refined analysis of the Swift-BAT burst
  55. GRB 051016B: Swift detection of a soft burst
  56. GRB051016 XMM-Newton observation
  57. GRB051016: Swift XRT refined analysis.
  58. GRB 051016: LCO optical and near-IR imaging
  59. GRB 051016: PROMPT Observations
  60. GRB051016: Swift detection of a burst
  61. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  62. GRB051006: optical observations
  63. GRB 051012: Swift-BAT detection of burst yesterday
  64. Swift trigger 159578 is not a burst
  65. Swift-BAT Trigger 159578 is a possible burst
  66. GRB050805A: Rc optical observations
  67. GRB 051006: Swift/UVOT Upper Limits
  68. IBAS Alert 2675 : not a GRB
  69. GRB051008: optical candidate
  70. GRB 051008 - a low redshift low-luminosity burst?
  71. IBAS Alert 2673: not a real GRB
  72. GRB051008: optical observation
  73. GRB051008: Swift XRT refined analysis
  74. GRB051008 - Swift UVOT upper limits
  75. Konus-Wind observation of GRB 051008
  76. GRB051008: Final refined analysis of the Swift-BAT burst
  77. GRB 051008: R-band upper limit
  78. GRB051008: Refined analysis of the Swift-BAT burst
  79. GRB 051008, optical observations
  80. GRB051008: Swift-BAT detection of a bright burst
  81. GRB 051006: P60 Observations
  82. GRB 051006: XRT refined analysis
  83. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  84. GRB 051006: optical observations at Sierra Nevada
  85. GRB051006: Refined analysis of the Swift-BAT burst
  86. GRB 051006: XRT position
  87. GRB051006: Swift detection of a burst
  88. GRB 050906, summary of radio observations
  89. Swift-BAT triggers 158261 and 158262 Retraction
  90. GRB 050925: Second Epoch WSRT Radio Observations
  91. GRB 051001, optical observations at Mt. John
  92. GRB 051001: I-band limit
  93. GRB 051001: AAT infra-red observations
  94. GRB 051001: Swift-BAT refined analysis
  95. GRB 051001: Swift Detection of a Burst
  96. GRB 051001: ROTSE-III Optical Limits
  97. GRB050922C: optical observation
  98. GRB 050922C: further VLT observations
  99. GRB050922C: UVES/VLT high resolution spectroscopy
  100. GRB050925: Swift/XRT limits

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