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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"

32724 results found.

  1. GRB 051021: MDM Upper Limit
  2. GRB 051022 (=H3950): SXC Flight Localization is Valid
  3. GRB051021: Swift/UVOT Upper Limits
  4. GRB 051021B: Refined analysis of the Swift-BAT burst
  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. GRB051021B: Swift XRT Position
  10. GRB 051021: SOAR NIR Observations
  11. GRB051021: Swift XRT analysis
  12. GRB 051021 : optical afterglow observation at Lulin
  13. GRB 051021: Optical observations
  14. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  15. GRB 051021: Optical observations and candidate afterglow
  16. GRB051021: A GRB Localized by HETE
  17. GRB 050502b: Optical limit
  18. GRB 051016b: Optical limit
  19. Afterglow candidate of GRB 051016B observed at Lulin
  20. GRB 051016b: Gemini Near IR Observations
  21. GRB 051016A: Swift/UVOT upper limits
  22. GRB 051016B: refined analysis of the Swift/XRT data
  23. GRB 051016B: Swift/UVOT detection
  24. GRB 051016B : Optical follow-up at Lulin
  25. GRB 051016B: Refined analysis of the Swift-BAT burst
  26. GRB 051016: Swift-BAT refined analysis
  27. GRB051016: Planned XMM-Newton observation
  28. GRB 051016: LCO optical and near-IR imaging
  29. GRB 051016: PROMPT Observations
  30. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  31. GRB051006: optical observations
  32. Swift trigger 159578 is not a burst
  33. GRB050805A: Rc optical observations
  34. GRB 051006: Swift/UVOT Upper Limits
  35. GRB051008: optical candidate
  36. GRB 051008 - a low redshift low-luminosity burst?
  37. GRB051008: Swift XRT refined analysis
  38. GRB051008 - Swift UVOT upper limits
  39. Konus-Wind observation of GRB 051008
  40. GRB051008: Final refined analysis of the Swift-BAT burst
  41. GRB 051008: R-band upper limit
  42. GRB051008: Refined analysis of the Swift-BAT burst
  43. GRB051008: Radio Observation
  44. GRB 051008: Swift XRT position
  45. GRB 051008, optical observations
  46. GRB 051006: P60 Observations
  47. GRB 051006: XRT refined analysis
  48. GRB051006: Refined analysis of the Swift-BAT burst
  49. GRB 051006: XRT position
  50. GRB 050906, summary of radio observations
  51. Swift-BAT triggers 158261 and 158262 Retraction
  52. GRB051001: Swift UVOT Upper Limits
  53. GRB 050925: Second Epoch WSRT Radio Observations
  54. GRB 051001: Swift XRT refined analysis
  55. GRB 051001, optical observations at Mt. John
  56. GRB 051001: I-band limit
  57. GRB 051001: AAT infra-red observations
  58. GRB 051001: Swift-BAT refined analysis
  59. GRB 051001: ROTSE-III Optical Limits
  60. GRB050908: optical observations
  61. GRB050922B: optical limit
  62. GRB 050922C: further VLT observations
  63. GRB 050820A: NIR photometry at the TNG
  64. GRB050922C: UVES/VLT high resolution spectroscopy
  65. GRB050925: Swift/XRT limits
  66. GRB/SGR 050925: IR Observations
  67. GRB050922C - Swift UVOT preliminary analysis
  68. GRB 050922C: break in the lightcurve
  69. GRB 050925: WSRT Radio Observations
  70. GRB050925: Swift UVOT upper limits
  71. Refined analysis of the Swift-BAT soft short burst
  72. GRB 050925 : I-band observation at Xinglong observatory
  73. GRB 050922B: Correction to BAT refined analysis, longer burst
  74. GRB050922C: TNG spectroscopic observations
  75. GRB050922B: refined XRT analysis
  76. Konus-Wind observation of GRB 050922C
  77. GRB 050922C: Refined redshift
  78. GRB050922B: Swift UVOT early upper limits.
  79. GRB OT observation
  80. GRB050922C: observation at MonteBoo
  81. INT 2.5m limit for GRB050922B
  82. GRB 050922B: optical limit
  83. GRB050922C: Optical Observations
  84. GRB 050922C: Swift XRT refined analysis
  85. HETE Fregate observations of GRB 050922C
  86. GRB 050922C: Swift-BAT refined analysis
  87. GRB 050922B: Swift-BAT refined analysis
  88. GRB050922C: optical observations
  89. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  90. GRB 050922C: NOT optical observations
  91. GRB 050922A: Analysis of Swift/XRT TOO observation
  92. GRB 050922C: Swift detection of a bright burst
  93. GRB 050922C: ROTSE-IIId Refined Analysis
  94. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  95. GRB 050922B: ROTSE-III Optical Limits
  96. GRB050918: Possible Swift/XRT detected afterglow
  97. GRB050916: Swift/UVOT Upper Limits
  98. GRB 050916: Swift-BAT refined analysis
  99. GRB 050915a: Radio Observations
  100. Swift-BAT trigger 155764 is not a GRB

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