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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"

36144 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. GRB 051021,optical observation
  10. GRB051021B: Swift XRT Position
  11. GRB 051021: SOAR NIR Observations
  12. GRB 051021B: Swift detection of a burst
  13. GRB051021 (=H3947): Refined Analysis
  14. GRB 051021 : optical afterglow observation at Lulin
  15. GRB 051021: Optical observations
  16. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  17. GRB 051021: Optical observations and candidate afterglow
  18. GRB051021.63
  19. GRB051021.6: MASTER optical observation
  20. Swift-BAT trigger 160640 is not a real GRB
  21. GRB051021: A GRB Localized by HETE
  22. Swift-BAT trigger 160619 is not a GRB
  23. Swift-BAT triggered on a posible CR Shower or possible GRB
  24. GRB 050502b: Optical limit
  25. GRB 051016b: Optical limit
  26. Afterglow candidate of GRB 051016B observed at Lulin
  27. GRB 051016b: Gemini Near IR Observations
  28. GRB 051016A: Swift/UVOT upper limits
  29. GRB 051016B: refined analysis of the Swift/XRT data
  30. GRB 051016B: Swift/UVOT detection
  31. GRB 051016B,optical observation
  32. GRB 051016B : Optical follow-up at Lulin
  33. GRB 051016B: Refined analysis of the Swift-BAT burst
  34. GRB 051016B: Swift detection of a soft burst
  35. GRB 051016: Swift-BAT refined analysis
  36. GRB051016: Swift XRT refined analysis.
  37. GRB 051016: LCO optical and near-IR imaging
  38. GRB 051016: PROMPT Observations
  39. GRB051016: Swift detection of a burst
  40. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  41. GRB051006: optical observations
  42. GRB 051012: Swift-BAT detection of burst yesterday
  43. Swift trigger 159578 is not a burst
  44. GRB 051006: Swift/UVOT Upper Limits
  45. IBAS Alert 2675 : not a GRB
  46. GRB051008: optical candidate
  47. GRB 051008: - a high redshift high-luminosity burst?
  48. GRB 051008 - a low redshift low-luminosity burst?
  49. IBAS Alert 2673: not a real GRB
  50. GRB051011: MASTER optical observation
  51. GRB051008: optical observation
  52. GRB051008: Swift XRT refined analysis
  53. GRB051008 - Swift UVOT upper limits
  54. Konus-Wind observation of GRB 051008
  55. GRB051008: Final refined analysis of the Swift-BAT burst
  56. GRB 051008: R-band upper limit
  57. GRB051008: Radio Observation
  58. GRB 051008: Swift XRT position
  59. GRB 051008, optical observations
  60. GRB 051008: early Swift XRT analysis
  61. GRB 051008: Swift UVOT Candidate
  62. GRB 051006: P60 Observations
  63. grb test
  64. GRB 051006: XRT refined analysis
  65. GRB 051006: optical observations at Sierra Nevada
  66. GRB 051006: XRT position
  67. GRB 050906, summary of radio observations
  68. GRB 050925: Second Epoch WSRT Radio Observations
  69. GRB 051001: Swift XRT refined analysis
  70. GRB 051001, optical observations at Mt. John
  71. GRB 051001: I-band limit
  72. GRB 051001: AAT infra-red observations
  73. GRB 051001: Swift-BAT refined analysis
  74. GRB 051001: Swift Detection of a Burst
  75. GRB 051001: ROTSE-III Optical Limits
  76. GRB050908: optical observations
  77. GRB050922C: optical observation
  78. GRB050922B: optical limit
  79. GRB 050922C: further VLT observations
  80. GRB 050820A: NIR photometry at the TNG
  81. GRB050922C: UVES/VLT high resolution spectroscopy
  82. GRB050925: Swift/XRT limits
  83. GRB/SGR 050925: IR Observations
  84. GRB 050922C: break in the lightcurve
  85. GRB 050925: WSRT Radio Observations
  86. GRB 050925 : I-band observation at Xinglong observatory
  87. GRB050925: Faulkes Telescope North R-band limit
  88. GRB050925: Swift-BAT detection of a short burst
  89. GRB 050922B: Correction to BAT refined analysis, longer burst
  90. GRB050922C: TNG spectroscopic observations
  91. GRB050922B: refined XRT analysis
  92. Konus-Wind observation of GRB 050922C
  93. GRB 050922C: Refined redshift
  94. GRB OT observation
  95. GRB050922C: observation at MonteBoo
  96. INT 2.5m limit for GRB050922B
  97. GRB 050922B: optical limit
  98. GRB050922C: Optical Observations
  99. GRB 050922C: Swift XRT refined analysis
  100. HETE Fregate observations of GRB 050922C

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