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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"

36141 results found.

  1. GRB 051021B: Refined analysis of the Swift-BAT burst
  2. GRB 051022: SSO40 Optical Observations
  3. GRB 051022A: ROTSE-III Optical Limits
  4. GRB051022 (=H3590), A GRB Detected By HETE
  5. GRB 051022: Optical observations
  6. GRB 051021,optical observation
  7. GRB051021B: Swift XRT Position
  8. GRB 051021: SOAR NIR Observations
  9. GRB 051021B: Swift detection of a burst
  10. GRB051021 (=H3947): Refined Analysis
  11. GRB 051021 : optical afterglow observation at Lulin
  12. GRB 051021: Optical observations
  13. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  14. GRB 051021: Optical observations and candidate afterglow
  15. GRB051021.63
  16. GRB051021.6: MASTER optical observation
  17. Swift-BAT trigger 160640 is not a real GRB
  18. GRB051021: A GRB Localized by HETE
  19. Swift-BAT trigger 160619 is not a GRB
  20. Swift-BAT triggered on a posible CR Shower or possible GRB
  21. GRB 050502b: Optical limit
  22. GRB 051016b: Optical limit
  23. Afterglow candidate of GRB 051016B observed at Lulin
  24. GRB 051016b: Gemini Near IR Observations
  25. GRB 051016A: Swift/UVOT upper limits
  26. GRB 051016B: refined analysis of the Swift/XRT data
  27. GRB 051016B: Swift/UVOT detection
  28. GRB 051016B,optical observation
  29. GRB 051016B : Optical follow-up at Lulin
  30. GRB 051016B: Refined analysis of the Swift-BAT burst
  31. GRB 051016B: Swift detection of a soft burst
  32. GRB 051016: Swift-BAT refined analysis
  33. GRB051016: Swift XRT refined analysis.
  34. GRB 051016: LCO optical and near-IR imaging
  35. GRB 051016: PROMPT Observations
  36. GRB051016: Swift detection of a burst
  37. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  38. GRB051006: optical observations
  39. GRB 051012: Swift-BAT detection of burst yesterday
  40. Swift trigger 159578 is not a burst
  41. GRB 051006: Swift/UVOT Upper Limits
  42. IBAS Alert 2675 : not a GRB
  43. GRB051008: optical candidate
  44. GRB 051008: - a high redshift high-luminosity burst?
  45. GRB 051008 - a low redshift low-luminosity burst?
  46. IBAS Alert 2673: not a real GRB
  47. GRB051011: MASTER optical observation
  48. GRB051008: optical observation
  49. GRB051008: Swift XRT refined analysis
  50. GRB051008 - Swift UVOT upper limits
  51. Konus-Wind observation of GRB 051008
  52. GRB051008: Final refined analysis of the Swift-BAT burst
  53. GRB 051008: R-band upper limit
  54. GRB051008: Radio Observation
  55. GRB 051008: Swift XRT position
  56. GRB 051008, optical observations
  57. GRB 051008: early Swift XRT analysis
  58. GRB 051008: Swift UVOT Candidate
  59. GRB 051006: P60 Observations
  60. grb test
  61. GRB 051006: XRT refined analysis
  62. GRB 051006: optical observations at Sierra Nevada
  63. GRB 051006: XRT position
  64. GRB 050906, summary of radio observations
  65. GRB 050925: Second Epoch WSRT Radio Observations
  66. GRB 051001: Swift XRT refined analysis
  67. GRB 051001, optical observations at Mt. John
  68. GRB 051001: I-band limit
  69. GRB 051001: AAT infra-red observations
  70. GRB 051001: Swift-BAT refined analysis
  71. GRB 051001: Swift Detection of a Burst
  72. GRB 051001: ROTSE-III Optical Limits
  73. GRB050908: optical observations
  74. GRB050922C: optical observation
  75. GRB050922B: optical limit
  76. GRB 050922C: further VLT observations
  77. GRB 050820A: NIR photometry at the TNG
  78. GRB050922C: UVES/VLT high resolution spectroscopy
  79. GRB050925: Swift/XRT limits
  80. GRB/SGR 050925: IR Observations
  81. GRB 050922C: break in the lightcurve
  82. GRB 050925: WSRT Radio Observations
  83. GRB 050925 : I-band observation at Xinglong observatory
  84. GRB050925: Faulkes Telescope North R-band limit
  85. GRB050925: Swift-BAT detection of a short burst
  86. GRB 050922B: Correction to BAT refined analysis, longer burst
  87. GRB050922C: TNG spectroscopic observations
  88. GRB050922B: refined XRT analysis
  89. Konus-Wind observation of GRB 050922C
  90. GRB 050922C: Refined redshift
  91. GRB OT observation
  92. GRB050922C: observation at MonteBoo
  93. INT 2.5m limit for GRB050922B
  94. GRB 050922B: optical limit
  95. GRB050922C: Optical Observations
  96. GRB 050922C: Swift XRT refined analysis
  97. HETE Fregate observations of GRB 050922C
  98. GRB 050922C: Swift-BAT refined analysis
  99. GRB 050922B: Swift-BAT refined analysis
  100. GRB 050922C: Absorption redshift from the Nordic Optical Telescope

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