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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"

32722 results found.

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

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