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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"

42975 results found.

  1. GRB 051021: P200 Ks Observations
  2. IPN triangulation of GRB051022 (=H3950)
  3. GRB 051021: MDM Upper Limit
  4. GRB 051022 (=H3950): SXC Flight Localization is Valid
  5. GRB 051022: SSO40 Optical Observations
  6. GRB 051022A: ROTSE-III Optical Limits
  7. GRB051022 (=H3590), A GRB Detected By HETE
  8. GRB 051022: Optical observations
  9. GRB 051021B: Swift detection of a burst
  10. GRB051021: Swift XRT analysis
  11. GRB051021 (=H3947): Refined Analysis
  12. GRB 051021: Optical observations
  13. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  14. GRB 051021: Optical observations and candidate afterglow
  15. GRB051021: A GRB Localized by HETE
  16. Swift-BAT trigger 160619 is not a GRB
  17. Swift-BAT triggered on a posible CR Shower or possible GRB
  18. GRB 050502b: Optical limit
  19. GRB 051016b: Optical limit
  20. GRB 051016b: Gemini Near IR Observations
  21. GRB 051016B: refined analysis of the Swift/XRT data
  22. GRB 051016B: Swift/UVOT detection
  23. GRB 051016B: Refined analysis of the Swift-BAT burst
  24. GRB 051016B: Swift detection of a soft burst
  25. GRB051016 XMM-Newton observation
  26. GRB051016: Swift XRT refined analysis.
  27. GRB 051016: LCO optical and near-IR imaging
  28. GRB 051016: PROMPT Observations
  29. GRB051016: Swift detection of a burst
  30. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  31. GRB051006: optical observations
  32. GRB 051012: Swift-BAT detection of burst yesterday
  33. Swift trigger 159578 is not a burst
  34. Swift-BAT Trigger 159578 is a possible burst
  35. GRB050805A: Rc optical observations
  36. GRB 051006: Swift/UVOT Upper Limits
  37. IBAS Alert 2675 : not a GRB
  38. GRB051008: optical candidate
  39. GRB 051008 - a low redshift low-luminosity burst?
  40. IBAS Alert 2673: not a real GRB
  41. GRB051008: optical observation
  42. GRB051008: Swift XRT refined analysis
  43. GRB051008 - Swift UVOT upper limits
  44. Konus-Wind observation of GRB 051008
  45. GRB051008: Final refined analysis of the Swift-BAT burst
  46. GRB 051008: R-band upper limit
  47. GRB051008: Refined analysis of the Swift-BAT burst
  48. GRB 051008, optical observations
  49. GRB051008: Swift-BAT detection of a bright burst
  50. GRB 051006: P60 Observations
  51. GRB 051006: XRT refined analysis
  52. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  53. GRB 051006: optical observations at Sierra Nevada
  54. GRB051006: Refined analysis of the Swift-BAT burst
  55. GRB 051006: XRT position
  56. GRB051006: Swift detection of a burst
  57. GRB 050906, summary of radio observations
  58. Swift-BAT triggers 158261 and 158262 Retraction
  59. GRB 050925: Second Epoch WSRT Radio Observations
  60. GRB 051001, optical observations at Mt. John
  61. GRB 051001: I-band limit
  62. GRB 051001: AAT infra-red observations
  63. GRB 051001: Swift-BAT refined analysis
  64. GRB 051001: Swift Detection of a Burst
  65. GRB 051001: ROTSE-III Optical Limits
  66. GRB050922C: optical observation
  67. GRB 050922C: further VLT observations
  68. GRB050922C: UVES/VLT high resolution spectroscopy
  69. GRB050925: Swift/XRT limits
  70. GRB/SGR 050925: IR Observations
  71. GRB050922C - Swift UVOT preliminary analysis
  72. GRB 050922C: break in the lightcurve
  73. GRB050925: Swift UVOT upper limits
  74. Refined analysis of the Swift-BAT soft short burst
  75. GRB050925: Faulkes Telescope North R-band limit
  76. GRB050925: Swift-BAT detection of a short burst
  77. GRB 050922B: Correction to BAT refined analysis, longer burst
  78. GRB050922C: TNG spectroscopic observations
  79. GRB050922B: refined XRT analysis
  80. Konus-Wind observation of GRB 050922C
  81. GRB 050922C: Refined redshift
  82. GRB050922B: Swift UVOT early upper limits.
  83. GRB050922C: observation at MonteBoo
  84. INT 2.5m limit for GRB050922B
  85. GRB 050922B: optical limit
  86. GRB050922C: Optical Observations
  87. GRB 050922C: Swift XRT refined analysis
  88. HETE Fregate observations of GRB 050922C
  89. GRB 050922B: Swift-BAT refined analysis
  90. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  91. GRB 050922C: optical obserations
  92. GRB 050922C: NOT optical observations
  93. GRB 050922A: Analysis of Swift/XRT TOO observation
  94. GRB 050922C: Swift detection of a bright burst
  95. GRB 050922B: ROTSE-III Optical Limits
  96. GRB050922B: Swift-BAT detection of a weak long burst
  97. Possible GRB 050922 detected by INTEGRAL
  98. GRB050918: Possible Swift/XRT detected afterglow
  99. GRB050820B: analysis of the XMM-Newton observation
  100. GRB050916: Swift/UVOT Upper Limits

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