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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"

37930 results found.

  1. GRB051028: Swift/UVOT upper limits
  2. GRB051028: confirmation of the afterglow
  3. GRB051028: WHT optical candidate
  4. GRB051028: Swift XRT Position
  5. GRB051028:MASTER observations
  6. GRB 051028 (=H3951): A GRB localized by HETE
  7. GRB051028:MASTER optical observations
  8. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  9. GRB051022: Swift XRT measurement of jet break
  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. GRB 051022: Swift/UVOT Upper Limits
  23. GRB051022: Radio Counterpart
  24. GRB 051022: SOAR JKs Observations
  25. GRB051021A: Swift XRT refined analysis
  26. Konus-Wind observation of GRB 051022
  27. GRB051022: Optical Observations
  28. GRB 051022: Magellan NIR imaging
  29. GRB 051021: PROMPT RcIc Observations
  30. GRB051021b: Magellan IR Imaging
  31. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  32. GRB 051021: Correction
  33. GRB 051022, J & K-band observation
  34. GRB 051021, SMARTS optical/IR observations
  35. GRB051022: Swift XRT Position
  36. GRB 051021: P200 Ks Observations
  37. IPN triangulation of GRB051022 (=H3950)
  38. GRB 051021: MDM Upper Limit
  39. GRB 051022 (=H3950): SXC Flight Localization is Valid
  40. GRB051021: Swift/UVOT Upper Limits
  41. GRB 051021B: Refined analysis of the Swift-BAT burst
  42. GRB 051022: SSO40 Optical Observations
  43. GRB 051022A: ROTSE-III Optical Limits
  44. GRB051022 (=H3590), A GRB Detected By HETE
  45. GRB 051022: Optical observations
  46. GRB 051021,optical observation
  47. GRB051021B: Swift XRT Position
  48. GRB 051021: SOAR NIR Observations
  49. GRB 051021B: Swift detection of a burst
  50. GRB051021: Swift XRT analysis
  51. GRB051021 (=H3947): Refined Analysis
  52. GRB 051021 : optical afterglow observation at Lulin
  53. GRB 051021: Optical observations
  54. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  55. GRB 051021: Optical observations and candidate afterglow
  56. GRB051021.63
  57. GRB051021.6: MASTER optical observation
  58. Swift-BAT trigger 160640 is not a real GRB
  59. GRB051021: A GRB Localized by HETE
  60. Swift-BAT trigger 160619 is not a GRB
  61. Swift-BAT triggered on a posible CR Shower or possible GRB
  62. GRB 050502b: Optical limit
  63. GRB 051016b: Optical limit
  64. Afterglow candidate of GRB 051016B observed at Lulin
  65. GRB 051016b: Gemini Near IR Observations
  66. GRB 051016A: Swift/UVOT upper limits
  67. GRB 051016B: refined analysis of the Swift/XRT data
  68. GRB 051016B: Swift/UVOT detection
  69. GRB 051016B,optical observation
  70. GRB 051016B : Optical follow-up at Lulin
  71. GRB 051016B: Refined analysis of the Swift-BAT burst
  72. GRB 051016B: Swift detection of a soft burst
  73. GRB 051016: Swift-BAT refined analysis
  74. GRB051016 XMM-Newton observation
  75. GRB051016: Swift XRT refined analysis.
  76. GRB 051016: LCO optical and near-IR imaging
  77. GRB 051016: PROMPT Observations
  78. GRB051016: Swift detection of a burst
  79. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  80. GRB051006: optical observations
  81. GRB 051012: Swift-BAT detection of burst yesterday
  82. Swift trigger 159578 is not a burst
  83. Swift-BAT Trigger 159578 is a possible burst
  84. GRB050805A: Rc optical observations
  85. GRB 051006: Swift/UVOT Upper Limits
  86. IBAS Alert 2675 : not a GRB
  87. GRB051008: optical candidate
  88. GRB 051008: - a high redshift high-luminosity burst?
  89. GRB 051008 - a low redshift low-luminosity burst?
  90. IBAS Alert 2673: not a real GRB
  91. GRB051011: MASTER optical observation
  92. GRB051008: optical observation
  93. GRB051008: Swift XRT refined analysis
  94. GRB051008 - Swift UVOT upper limits
  95. Konus-Wind observation of GRB 051008
  96. GRB051008: Final refined analysis of the Swift-BAT burst
  97. GRB 051008: R-band upper limit
  98. GRB051008: Refined analysis of the Swift-BAT burst
  99. GRB051008: Radio Observation
  100. GRB 051008: Swift XRT position

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