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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"

32725 results found.

  1. IPN triangulation of GRB051022 (=H3950)
  2. GRB 051021: MDM Upper Limit
  3. GRB 051022 (=H3950): SXC Flight Localization is Valid
  4. GRB051021: Swift/UVOT Upper Limits
  5. GRB 051021B: Refined analysis of the Swift-BAT burst
  6. GRB 051022: SSO40 Optical Observations
  7. GRB 051022A: ROTSE-III Optical Limits
  8. GRB051022 (=H3590), A GRB Detected By HETE
  9. GRB 051022: Optical observations
  10. GRB051021B: Swift XRT Position
  11. GRB 051021: SOAR NIR Observations
  12. GRB051021: Swift XRT analysis
  13. GRB 051021 : optical afterglow observation at Lulin
  14. GRB 051021: Optical observations
  15. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  16. GRB 051021: Optical observations and candidate afterglow
  17. GRB051021: A GRB Localized by HETE
  18. GRB 050502b: Optical limit
  19. GRB 051016b: Optical limit
  20. Afterglow candidate of GRB 051016B observed at Lulin
  21. GRB 051016b: Gemini Near IR Observations
  22. GRB 051016A: Swift/UVOT upper limits
  23. GRB 051016B: refined analysis of the Swift/XRT data
  24. GRB 051016B: Swift/UVOT detection
  25. GRB 051016B : Optical follow-up at Lulin
  26. GRB 051016B: Refined analysis of the Swift-BAT burst
  27. GRB 051016: Swift-BAT refined analysis
  28. GRB051016: Planned XMM-Newton observation
  29. GRB 051016: LCO optical and near-IR imaging
  30. GRB 051016: PROMPT Observations
  31. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  32. GRB051006: optical observations
  33. Swift trigger 159578 is not a burst
  34. GRB050805A: Rc optical observations
  35. GRB 051006: Swift/UVOT Upper Limits
  36. GRB051008: optical candidate
  37. GRB 051008 - a low redshift low-luminosity burst?
  38. GRB051008: Swift XRT refined analysis
  39. GRB051008 - Swift UVOT upper limits
  40. Konus-Wind observation of GRB 051008
  41. GRB051008: Final refined analysis of the Swift-BAT burst
  42. GRB 051008: R-band upper limit
  43. GRB051008: Refined analysis of the Swift-BAT burst
  44. GRB051008: Radio Observation
  45. GRB 051008: Swift XRT position
  46. GRB 051008, optical observations
  47. GRB 051006: P60 Observations
  48. GRB 051006: XRT refined analysis
  49. GRB051006: Refined analysis of the Swift-BAT burst
  50. GRB 051006: XRT position
  51. GRB 050906, summary of radio observations
  52. Swift-BAT triggers 158261 and 158262 Retraction
  53. GRB051001: Swift UVOT Upper Limits
  54. GRB 050925: Second Epoch WSRT Radio Observations
  55. GRB 051001: Swift XRT refined analysis
  56. GRB 051001, optical observations at Mt. John
  57. GRB 051001: I-band limit
  58. GRB 051001: AAT infra-red observations
  59. GRB 051001: Swift-BAT refined analysis
  60. GRB 051001: ROTSE-III Optical Limits
  61. GRB050908: optical observations
  62. GRB050922B: optical limit
  63. GRB 050922C: further VLT observations
  64. GRB 050820A: NIR photometry at the TNG
  65. GRB050922C: UVES/VLT high resolution spectroscopy
  66. GRB050925: Swift/XRT limits
  67. GRB/SGR 050925: IR Observations
  68. GRB050922C - Swift UVOT preliminary analysis
  69. GRB 050922C: break in the lightcurve
  70. GRB 050925: WSRT Radio Observations
  71. GRB050925: Swift UVOT upper limits
  72. Refined analysis of the Swift-BAT soft short burst
  73. GRB 050925 : I-band observation at Xinglong observatory
  74. GRB 050922B: Correction to BAT refined analysis, longer burst
  75. GRB050922C: TNG spectroscopic observations
  76. GRB050922B: refined XRT analysis
  77. Konus-Wind observation of GRB 050922C
  78. GRB 050922C: Refined redshift
  79. GRB050922B: Swift UVOT early upper limits.
  80. GRB OT observation
  81. GRB050922C: observation at MonteBoo
  82. INT 2.5m limit for GRB050922B
  83. GRB 050922B: optical limit
  84. GRB050922C: Optical Observations
  85. GRB 050922C: Swift XRT refined analysis
  86. HETE Fregate observations of GRB 050922C
  87. GRB 050922C: Swift-BAT refined analysis
  88. GRB 050922B: Swift-BAT refined analysis
  89. GRB050922C: optical observations
  90. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  91. GRB 050922C: NOT optical observations
  92. GRB 050922A: Analysis of Swift/XRT TOO observation
  93. GRB 050922C: Swift detection of a bright burst
  94. GRB 050922C: ROTSE-IIId Refined Analysis
  95. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  96. GRB 050922B: ROTSE-III Optical Limits
  97. GRB050918: Possible Swift/XRT detected afterglow
  98. GRB050916: Swift/UVOT Upper Limits
  99. GRB 050916: Swift-BAT refined analysis
  100. GRB 050915a: Radio Observations

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