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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28084 results found.

  1. GRB051021.63
  2. GRB051021.6: MASTER optical observation
  3. GRB051021: A GRB Localized by HETE
  4. Swift-BAT triggered on a posible CR Shower or possible GRB
  5. GRB 051016b: Optical limit
  6. Afterglow candidate of GRB 051016B observed at Lulin
  7. GRB 051016A: Swift/UVOT upper limits
  8. GRB 051016B: refined analysis of the Swift/XRT data
  9. GRB 051016B: Swift/UVOT detection
  10. GRB 051016B,optical observation
  11. GRB 051016B : Optical follow-up at Lulin
  12. GRB 051016B: Refined analysis of the Swift-BAT burst
  13. GRB 051016B: Swift detection of a soft burst
  14. GRB 051016: Swift-BAT refined analysis
  15. GRB051016 XMM-Newton observation
  16. GRB051016: Swift XRT refined analysis.
  17. GRB 051016: PROMPT Observations
  18. GRB051016: Swift detection of a burst
  19. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  20. GRB 051012: Swift-BAT detection of burst yesterday
  21. Swift-BAT Trigger 159578 is a possible burst
  22. GRB 051006: Swift/UVOT Upper Limits
  23. GRB051008: optical candidate
  24. GRB 051008 - a low redshift low-luminosity burst?
  25. GRB051011: bright nebulae near error box
  26. GRB051011: MASTER optical observation
  27. GRB051008: Final refined analysis of the Swift-BAT burst
  28. GRB051008: Radio Observation
  29. GRB 051008, optical observations
  30. GRB 051008: early Swift XRT analysis
  31. GRB 051008: Swift UVOT Candidate
  32. GRB 051006: P60 Observations
  33. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  34. GRB 051006: optical observations at Sierra Nevada
  35. GRB051006: Refined analysis of the Swift-BAT burst
  36. GRB051006: Swift detection of a burst
  37. GRB 050906, summary of radio observations
  38. GRB051001: Swift UVOT Upper Limits
  39. GRB 050925: Second Epoch WSRT Radio Observations
  40. GRB 051001: I-band limit
  41. GRB 051001: AAT infra-red observations
  42. GRB 051001: Swift-BAT refined analysis
  43. GRB 051001: Swift Detection of a Burst
  44. GRB 050820A: NIR photometry at the TNG
  45. GRB050925: Swift/XRT limits
  46. GRB/SGR 050925: IR Observations
  47. GRB 050922C: break in the lightcurve
  48. GRB050925: Swift UVOT upper limits
  49. Refined analysis of the Swift-BAT soft short burst
  50. GRB050925: Faulkes Telescope North R-band limit
  51. GRB050925: Swift-BAT detection of a short burst
  52. GRB050922C: TNG spectroscopic observations
  53. GRB050922B: refined XRT analysis
  54. GRB050922B: Swift UVOT early upper limits.
  55. GRB050922C: Optical Observations
  56. GRB 050922C: Swift XRT refined analysis
  57. HETE Fregate observations of GRB 050922C
  58. GRB 050922C: Swift-BAT refined analysis
  59. GRB 050922B: Swift-BAT refined analysis
  60. GRB 050922C: optical obserations
  61. GRB 050922C: NOT optical observations
  62. GRB 050922C: Swift detection of a bright burst
  63. GRB 050922B: ROTSE-III Optical Limits
  64. GRB 050922B,optical observation
  65. GRB050922B: Swift-BAT detection of a weak long burst
  66. GRB050820B: analysis of the XMM-Newton observation
  67. GRB050916: Swift/UVOT Upper Limits
  68. GRB 050916: Swift-BAT refined analysis
  69. Swift-BAT trigger 155764 is not a GRB
  70. Swift-BAT trigger 155764 is probably not a GRB
  71. Swift trigger 155764: bad XRT centroid
  72. Swift-BAT trigger 155535 is definitely not a GRB
  73. GRB050916 : Swift-XRT refined analysis
  74. GRB 050915B: Swift-BAT refined analysis
  75. GRB 050915B: Swift/UVOT Upper Limits
  76. GRB 050915a: IR Transient
  77. GRB 050915b, SMARTS optical/IR observations
  78. GRB050915B: Swift-BAT detection of a long bright burst
  79. GRB050915: Swift/UVOT upper limits
  80. GRB 050915: IR Observations
  81. GRB 050915: Swift XRT refined analysis
  82. GRB 050915: Swift-BAT refined analysis
  83. GRB 050915: Swift detection of a GRB
  84. GRB050911: Upper limit on X-ray afterglow
  85. Swift-BAT trigger 155072 ground analysis
  86. Swift-BAT trigger 155072 is probably not a GRB
  87. GRB 050908: DEIMOS spectrum and further analysis
  88. GRB 050911, optical content of Swift/XRT error box
  89. GRB 050911: Swift-BAT refined analysis
  90. GRB 050911: z~0.16 cluster in the field
  91. GRB050911: Swift-BAT detection of a long burst
  92. GRB 050910a: TAROT early optical limits
  93. WIRO observations in I of GRB 050908
  94. GRB 050906: Possible X-ray Counterpart
  95. GRB050908: Swift/UVOT Early upper limits
  96. GRB050908 : Swift-XRT refined analysis
  97. GRB 050908: Swift-BAT refined analysis
  98. GRB 050908: Optical observations
  99. GRB 050908: Optical Observations
  100. GRB 050908: Swift detection of a burst

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