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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"

37768 results found.

  1. GRB051021B: Swift/UVOT Upper limits
  2. GRB 051021, Optical Observations
  3. GRB 051022: XRT Refined Spectral and Temporal Analysis
  4. GRB 051022, refined optical astrometry
  5. Chandra Observations of GRB 051022
  6. GRB 051022 Chandra Observations scheduled
  7. GRB051021a: optical observations
  8. GRB 051022: WSRT Radio Detection
  9. GRB 051022, mm counterpart
  10. GRB051022: host galaxy redshift
  11. GRB 051022: Swift/UVOT Upper Limits
  12. GRB051022: Radio Counterpart
  13. GRB 051022: SOAR JKs Observations
  14. Konus-Wind observation of GRB 051022
  15. GRB051022: Optical Observations
  16. GRB 051022: Magellan NIR imaging
  17. GRB 051021: PROMPT RcIc Observations
  18. GRB051021b: Magellan IR Imaging
  19. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  20. GRB 051021: Correction
  21. GRB 051022, J & K-band observation
  22. GRB 051021, SMARTS optical/IR observations
  23. GRB 051021: P200 Ks Observations
  24. IPN triangulation of GRB051022 (=H3950)
  25. GRB 051021: MDM Upper Limit
  26. GRB 051022 (=H3950): SXC Flight Localization is Valid
  27. GRB051021: Swift/UVOT Upper Limits
  28. GRB 051021B: Refined analysis of the Swift-BAT burst
  29. GRB 051022: SSO40 Optical Observations
  30. GRB 051022A: ROTSE-III Optical Limits
  31. GRB051022 (=H3590), A GRB Detected By HETE
  32. GRB 051022: Optical observations
  33. GRB 051021,optical observation
  34. GRB051021B: Swift XRT Position
  35. GRB 051021: SOAR NIR Observations
  36. GRB 051021B: Swift detection of a burst
  37. GRB051021 (=H3947): Refined Analysis
  38. GRB 051021 : optical afterglow observation at Lulin
  39. GRB 051021: Optical observations
  40. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  41. GRB 051021: Optical observations and candidate afterglow
  42. GRB051021.63
  43. GRB051021.6: MASTER optical observation
  44. Swift-BAT trigger 160640 is not a real GRB
  45. GRB051021: A GRB Localized by HETE
  46. Swift-BAT trigger 160619 is not a GRB
  47. Swift-BAT triggered on a posible CR Shower or possible GRB
  48. GRB 050502b: Optical limit
  49. GRB 051016b: Optical limit
  50. Afterglow candidate of GRB 051016B observed at Lulin
  51. GRB 051016b: Gemini Near IR Observations
  52. GRB 051016A: Swift/UVOT upper limits
  53. GRB 051016B: refined analysis of the Swift/XRT data
  54. GRB 051016B: Swift/UVOT detection
  55. GRB 051016B,optical observation
  56. GRB 051016B : Optical follow-up at Lulin
  57. GRB 051016B: Refined analysis of the Swift-BAT burst
  58. GRB 051016B: Swift detection of a soft burst
  59. GRB 051016: Swift-BAT refined analysis
  60. GRB051016: Swift XRT refined analysis.
  61. GRB 051016: LCO optical and near-IR imaging
  62. GRB 051016: PROMPT Observations
  63. GRB051016: Swift detection of a burst
  64. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  65. GRB051006: optical observations
  66. GRB 051012: Swift-BAT detection of burst yesterday
  67. Swift trigger 159578 is not a burst
  68. GRB 051006: Swift/UVOT Upper Limits
  69. IBAS Alert 2675 : not a GRB
  70. GRB051008: optical candidate
  71. GRB 051008: - a high redshift high-luminosity burst?
  72. GRB 051008 - a low redshift low-luminosity burst?
  73. IBAS Alert 2673: not a real GRB
  74. GRB051011: MASTER optical observation
  75. GRB051008: optical observation
  76. GRB051008: Swift XRT refined analysis
  77. GRB051008 - Swift UVOT upper limits
  78. Konus-Wind observation of GRB 051008
  79. GRB051008: Final refined analysis of the Swift-BAT burst
  80. GRB 051008: R-band upper limit
  81. GRB051008: Radio Observation
  82. GRB 051008: Swift XRT position
  83. GRB 051008, optical observations
  84. GRB 051008: early Swift XRT analysis
  85. GRB 051008: Swift UVOT Candidate
  86. GRB 051006: P60 Observations
  87. grb test
  88. GRB 051006: XRT refined analysis
  89. GRB 051006: optical observations at Sierra Nevada
  90. GRB 051006: XRT position
  91. GRB 050906, summary of radio observations
  92. GRB 050925: Second Epoch WSRT Radio Observations
  93. GRB 051001: Swift XRT refined analysis
  94. GRB 051001, optical observations at Mt. John
  95. GRB 051001: I-band limit
  96. GRB 051001: AAT infra-red observations
  97. GRB 051001: Swift-BAT refined analysis
  98. GRB 051001: Swift Detection of a Burst
  99. GRB 051001: ROTSE-III Optical Limits
  100. GRB050908: optical observations

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