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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"

41997 results found.

  1. GRB 051022 (=H3950): SXC Flight Localization is Valid
  2. GRB051021: Swift/UVOT Upper Limits
  3. GRB 051021B: Refined analysis of the Swift-BAT burst
  4. GRB 051022: SSO40 Optical Observations
  5. GRB051022,optical observation
  6. GRB 051022A: ROTSE-III Optical Limits
  7. GRB051022 (=H3590), A GRB Detected By HETE
  8. GRB 051022: Optical observations
  9. GRB051021B: Swift XRT Position
  10. GRB 051021: SOAR NIR Observations
  11. GRB 051021B: Swift detection of a burst
  12. GRB051021: Swift XRT analysis
  13. GRB051021 (=H3947): Refined Analysis
  14. GRB 051021 : optical afterglow observation at Lulin
  15. GRB 051021: Optical observations
  16. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  17. GRB 051021: Optical observations and candidate afterglow
  18. GRB051021.63
  19. GRB051021.6: MASTER optical observation
  20. Swift-BAT trigger 160640 is not a real GRB
  21. GRB051021: A GRB Localized by HETE
  22. Swift-BAT trigger 160619 is not a GRB
  23. Swift-BAT triggered on a posible CR Shower or possible GRB
  24. GRB 050502b: Optical limit
  25. GRB 051016b: Optical limit
  26. Afterglow candidate of GRB 051016B observed at Lulin
  27. GRB 051016b: Gemini Near IR Observations
  28. GRB 051016A: Swift/UVOT upper limits
  29. GRB 051016B: refined analysis of the Swift/XRT data
  30. GRB 051016B: Swift/UVOT detection
  31. GRB 051016B : Optical follow-up at Lulin
  32. GRB 051016B: Refined analysis of the Swift-BAT burst
  33. GRB 051016B: Swift detection of a soft burst
  34. GRB 051016: Swift-BAT refined analysis
  35. GRB051016 XMM-Newton observation
  36. GRB051016: Swift XRT refined analysis.
  37. GRB051016: Planned XMM-Newton observation
  38. GRB 051016: LCO optical and near-IR imaging
  39. GRB 051016: PROMPT Observations
  40. GRB051016: Swift detection of a burst
  41. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  42. GRB051006: optical observations
  43. GRB 051012: Swift-BAT detection of burst yesterday
  44. Swift trigger 159578 is not a burst
  45. Swift-BAT Trigger 159578 is a possible burst
  46. GRB050805A: Rc optical observations
  47. GRB 051006: Swift/UVOT Upper Limits
  48. GRB051008: optical candidate
  49. GRB 051008 - a low redshift low-luminosity burst?
  50. GRB051011: MASTER optical observation
  51. GRB051008: optical observation
  52. GRB051008: Swift XRT refined analysis
  53. GRB051008 - Swift UVOT upper limits
  54. Konus-Wind observation of GRB 051008
  55. GRB051008: Final refined analysis of the Swift-BAT burst
  56. GRB 051008: R-band upper limit
  57. GRB051008: Refined analysis of the Swift-BAT burst
  58. GRB051008: Radio Observation
  59. GRB 051008: Swift XRT position
  60. GRB 051008, optical observations
  61. GRB 051008: early Swift XRT analysis
  62. GRB 051008: Swift UVOT Candidate
  63. GRB051008: Swift-BAT detection of a bright burst
  64. GRB 051006: P60 Observations
  65. GRB 051006: XRT refined analysis
  66. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  67. GRB 051006: optical observations at Sierra Nevada
  68. GRB051006: Refined analysis of the Swift-BAT burst
  69. GRB 051006: XRT position
  70. GRB051006: Swift detection of a burst
  71. GRB 050906, summary of radio observations
  72. Swift-BAT triggers 158261 and 158262 Retraction
  73. GRB051001: Swift UVOT Upper Limits
  74. GRB 050925: Second Epoch WSRT Radio Observations
  75. GRB 051001: Swift XRT refined analysis
  76. GRB 051001, optical observations at Mt. John
  77. GRB 051001: I-band limit
  78. GRB 051001: AAT infra-red observations
  79. GRB 051001: Swift-BAT refined analysis
  80. GRB 051001: Swift Detection of a Burst
  81. GRB 051001: ROTSE-III Optical Limits
  82. GRB050908: optical observations
  83. GRB050922C: optical observation
  84. GRB050922B: optical limit
  85. GRB 050922C: further VLT observations
  86. GRB 050820A: NIR photometry at the TNG
  87. GRB050922C: UVES/VLT high resolution spectroscopy
  88. GRB050925: Swift/XRT limits
  89. GRB/SGR 050925: IR Observations
  90. GRB050922C - Swift UVOT preliminary analysis
  91. GRB 050922C: break in the lightcurve
  92. GRB 050925: WSRT Radio Observations
  93. GRB050925: Swift UVOT upper limits
  94. Refined analysis of the Swift-BAT soft short burst
  95. GRB 050925 : I-band observation at Xinglong observatory
  96. GRB050925: Faulkes Telescope North R-band limit
  97. GRB050925: Swift-BAT detection of a short burst
  98. GRB 050922B: Correction to BAT refined analysis, longer burst
  99. GRB050922C: TNG spectroscopic observations
  100. GRB050922B: refined XRT analysis

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