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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"

32728 results found.

  1. GRB 051021, SMARTS optical/IR observations
  2. GRB051022: Swift XRT Position
  3. GRB 051021: P200 Ks Observations
  4. IPN triangulation of GRB051022 (=H3950)
  5. GRB 051021: MDM Upper Limit
  6. GRB 051022 (=H3950): SXC Flight Localization is Valid
  7. GRB051021: Swift/UVOT Upper Limits
  8. GRB 051021B: Refined analysis of the Swift-BAT burst
  9. GRB 051022: SSO40 Optical Observations
  10. GRB 051022A: ROTSE-III Optical Limits
  11. GRB051022 (=H3590), A GRB Detected By HETE
  12. GRB 051022: Optical observations
  13. GRB051021B: Swift XRT Position
  14. GRB 051021: SOAR NIR Observations
  15. GRB051021: Swift XRT analysis
  16. GRB 051021 : optical afterglow observation at Lulin
  17. GRB 051021: Optical observations
  18. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  19. GRB 051021: Optical observations and candidate afterglow
  20. GRB051021: A GRB Localized by HETE
  21. GRB 050502b: Optical limit
  22. GRB 051016b: Optical limit
  23. Afterglow candidate of GRB 051016B observed at Lulin
  24. GRB 051016b: Gemini Near IR Observations
  25. GRB 051016A: Swift/UVOT upper limits
  26. GRB 051016B: refined analysis of the Swift/XRT data
  27. GRB 051016B: Swift/UVOT detection
  28. GRB 051016B : Optical follow-up at Lulin
  29. GRB 051016B: Refined analysis of the Swift-BAT burst
  30. GRB 051016: Swift-BAT refined analysis
  31. GRB051016: Planned XMM-Newton observation
  32. GRB 051016: LCO optical and near-IR imaging
  33. GRB 051016: PROMPT Observations
  34. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  35. GRB051006: optical observations
  36. Swift trigger 159578 is not a burst
  37. GRB050805A: Rc optical observations
  38. GRB 051006: Swift/UVOT Upper Limits
  39. GRB051008: optical candidate
  40. GRB 051008 - a low redshift low-luminosity burst?
  41. GRB051008: Swift XRT refined analysis
  42. GRB051008 - Swift UVOT upper limits
  43. Konus-Wind observation of GRB 051008
  44. GRB051008: Final refined analysis of the Swift-BAT burst
  45. GRB 051008: R-band upper limit
  46. GRB051008: Refined analysis of the Swift-BAT burst
  47. GRB051008: Radio Observation
  48. GRB 051008: Swift XRT position
  49. GRB 051008, optical observations
  50. GRB 051006: P60 Observations
  51. GRB 051006: XRT refined analysis
  52. GRB051006: Refined analysis of the Swift-BAT burst
  53. GRB 051006: XRT position
  54. GRB 050906, summary of radio observations
  55. Swift-BAT triggers 158261 and 158262 Retraction
  56. GRB051001: Swift UVOT Upper Limits
  57. GRB 050925: Second Epoch WSRT Radio Observations
  58. GRB 051001: Swift XRT refined analysis
  59. GRB 051001, optical observations at Mt. John
  60. GRB 051001: I-band limit
  61. GRB 051001: AAT infra-red observations
  62. GRB 051001: Swift-BAT refined analysis
  63. GRB 051001: ROTSE-III Optical Limits
  64. GRB050908: optical observations
  65. GRB050922B: optical limit
  66. GRB 050922C: further VLT observations
  67. GRB 050820A: NIR photometry at the TNG
  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. GRB 050925: WSRT Radio Observations
  74. GRB050925: Swift UVOT upper limits
  75. Refined analysis of the Swift-BAT soft short burst
  76. GRB 050925 : I-band observation at Xinglong observatory
  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. GRB OT observation
  84. GRB050922C: observation at MonteBoo
  85. INT 2.5m limit for GRB050922B
  86. GRB 050922B: optical limit
  87. GRB050922C: Optical Observations
  88. GRB 050922C: Swift XRT refined analysis
  89. HETE Fregate observations of GRB 050922C
  90. GRB 050922C: Swift-BAT refined analysis
  91. GRB 050922B: Swift-BAT refined analysis
  92. GRB050922C: optical observations
  93. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  94. GRB 050922C: NOT optical observations
  95. GRB 050922A: Analysis of Swift/XRT TOO observation
  96. GRB 050922C: Swift detection of a bright burst
  97. GRB 050922C: ROTSE-IIId Refined Analysis
  98. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  99. GRB 050922B: ROTSE-III Optical Limits
  100. GRB050918: Possible Swift/XRT detected afterglow

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