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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"

32720 results found.

  1. GRB 051022: SSO40 Optical Observations
  2. GRB 051022A: ROTSE-III Optical Limits
  3. GRB051022 (=H3590), A GRB Detected By HETE
  4. GRB 051022: Optical observations
  5. GRB051021B: Swift XRT Position
  6. GRB 051021: SOAR NIR Observations
  7. GRB051021: Swift XRT analysis
  8. GRB 051021 : optical afterglow observation at Lulin
  9. GRB 051021: Optical observations
  10. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  11. GRB 051021: Optical observations and candidate afterglow
  12. GRB051021: A GRB Localized by HETE
  13. GRB 050502b: Optical limit
  14. GRB 051016b: Optical limit
  15. Afterglow candidate of GRB 051016B observed at Lulin
  16. GRB 051016b: Gemini Near IR Observations
  17. GRB 051016A: Swift/UVOT upper limits
  18. GRB 051016B: refined analysis of the Swift/XRT data
  19. GRB 051016B: Swift/UVOT detection
  20. GRB 051016B : Optical follow-up at Lulin
  21. GRB 051016B: Refined analysis of the Swift-BAT burst
  22. GRB 051016: Swift-BAT refined analysis
  23. GRB051016: Planned XMM-Newton observation
  24. GRB 051016: LCO optical and near-IR imaging
  25. GRB 051016: PROMPT Observations
  26. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  27. GRB051006: optical observations
  28. Swift trigger 159578 is not a burst
  29. GRB050805A: Rc optical observations
  30. GRB 051006: Swift/UVOT Upper Limits
  31. GRB051008: optical candidate
  32. GRB 051008 - a low redshift low-luminosity burst?
  33. GRB051008: Swift XRT refined analysis
  34. GRB051008 - Swift UVOT upper limits
  35. Konus-Wind observation of GRB 051008
  36. GRB051008: Final refined analysis of the Swift-BAT burst
  37. GRB 051008: R-band upper limit
  38. GRB051008: Refined analysis of the Swift-BAT burst
  39. GRB051008: Radio Observation
  40. GRB 051008: Swift XRT position
  41. GRB 051008, optical observations
  42. GRB 051006: P60 Observations
  43. GRB 051006: XRT refined analysis
  44. GRB051006: Refined analysis of the Swift-BAT burst
  45. GRB 051006: XRT position
  46. GRB 050906, summary of radio observations
  47. Swift-BAT triggers 158261 and 158262 Retraction
  48. GRB051001: Swift UVOT Upper Limits
  49. GRB 050925: Second Epoch WSRT Radio Observations
  50. GRB 051001: Swift XRT refined analysis
  51. GRB 051001, optical observations at Mt. John
  52. GRB 051001: I-band limit
  53. GRB 051001: AAT infra-red observations
  54. GRB 051001: Swift-BAT refined analysis
  55. GRB 051001: ROTSE-III Optical Limits
  56. GRB050908: optical observations
  57. GRB050922B: optical limit
  58. GRB 050922C: further VLT observations
  59. GRB 050820A: NIR photometry at the TNG
  60. GRB050922C: UVES/VLT high resolution spectroscopy
  61. GRB050925: Swift/XRT limits
  62. GRB/SGR 050925: IR Observations
  63. GRB050922C - Swift UVOT preliminary analysis
  64. GRB 050922C: break in the lightcurve
  65. GRB 050925: WSRT Radio Observations
  66. GRB050925: Swift UVOT upper limits
  67. Refined analysis of the Swift-BAT soft short burst
  68. GRB 050925 : I-band observation at Xinglong observatory
  69. GRB 050922B: Correction to BAT refined analysis, longer burst
  70. GRB050922C: TNG spectroscopic observations
  71. GRB050922B: refined XRT analysis
  72. Konus-Wind observation of GRB 050922C
  73. GRB 050922C: Refined redshift
  74. GRB050922B: Swift UVOT early upper limits.
  75. GRB OT observation
  76. GRB050922C: observation at MonteBoo
  77. INT 2.5m limit for GRB050922B
  78. GRB 050922B: optical limit
  79. GRB050922C: Optical Observations
  80. GRB 050922C: Swift XRT refined analysis
  81. HETE Fregate observations of GRB 050922C
  82. GRB 050922C: Swift-BAT refined analysis
  83. GRB 050922B: Swift-BAT refined analysis
  84. GRB050922C: optical observations
  85. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  86. GRB 050922C: NOT optical observations
  87. GRB 050922A: Analysis of Swift/XRT TOO observation
  88. GRB 050922C: Swift detection of a bright burst
  89. GRB 050922C: ROTSE-IIId Refined Analysis
  90. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  91. GRB 050922B: ROTSE-III Optical Limits
  92. GRB050918: Possible Swift/XRT detected afterglow
  93. GRB050916: Swift/UVOT Upper Limits
  94. GRB 050916: Swift-BAT refined analysis
  95. GRB 050915a: Radio Observations
  96. Swift-BAT trigger 155764 is not a GRB
  97. Swift-BAT trigger 155764 is probably not a GRB
  98. GRB050916 : Swift-XRT refined analysis
  99. GRB 050916: XRT position
  100. GRB 050915b, SMARTS optical/IR observations of the XRT position

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