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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"

24410 results found.

  1. GRB051105A: Swift/UVOT Observations
  2. GRB051103:_MASTER_optical_observations
  3. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  4. GRB 051105: Swift-BAT improved refined analysis
  5. GRB051105B - A long GRB detected by INTEGRAL
  6. GRB 051105: Swift detection of a short burst
  7. IBAS Alert 2700: Not a GRB
  8. GRB051016B: optical observation
  9. Konus-Wind observation of GRB 051028
  10. GRB051028:MASTER correction and final results
  11. GRB051028: optical observations
  12. GRB051028:MASTER observations
  13. GRB051028:MASTER optical observations
  14. GRB051022: Swift XRT measurement of jet break
  15. SGR 1806-20: continued moderate activity seen with INTEGRAL
  16. GRB051021B: Swift/UVOT Upper limits
  17. GRB 051022: XRT Refined Spectral and Temporal Analysis
  18. GRB051012: Swift-XRT analysis
  19. GRB051021a: optical observations
  20. GRB 051022: Swift/UVOT Upper Limits
  21. GRB 051022: SOAR JKs Observations
  22. Konus-Wind observation of GRB 051022
  23. GRB051022: Optical Observations
  24. GRB 051021: PROMPT RcIc Observations
  25. GRB 051021, SMARTS optical/IR observations
  26. GRB 051022 (=H3950): SXC Flight Localization is Valid
  27. GRB051021: Swift/UVOT Upper Limits
  28. GRB 051022: SSO40 Optical Observations
  29. GRB051022,optical observation
  30. GRB 051022A: ROTSE-III Optical Limits
  31. GRB051022 (=H3590), A GRB Detected By HETE
  32. GRB 051021,optical observation
  33. GRB 051021: SOAR NIR Observations
  34. GRB051021: Swift XRT analysis
  35. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  36. GRB 051021: Optical observations and candidate afterglow
  37. GRB051021.63
  38. GRB051021.6: MASTER optical observation
  39. Swift-BAT trigger 160640 is not a real GRB
  40. GRB051021: A GRB Localized by HETE
  41. GRB 051016A: Swift/UVOT upper limits
  42. GRB 051016B: refined analysis of the Swift/XRT data
  43. GRB 051016: Swift-BAT refined analysis
  44. GRB051016: Swift XRT refined analysis.
  45. GRB 051016: PROMPT Observations
  46. GRB051006: optical observations
  47. GRB 051012: Swift-BAT detection of burst yesterday
  48. Swift-BAT Trigger 159578 is a possible burst
  49. GRB050805A: Rc optical observations
  50. IBAS Alert 2675 : not a GRB
  51. GRB051008: optical candidate
  52. GRB 051008: - a high redshift high-luminosity burst?
  53. GRB 051008 - a low redshift low-luminosity burst?
  54. IBAS Alert 2673: not a real GRB
  55. GRB051011: MASTER optical observation
  56. GRB051008: Swift XRT refined analysis
  57. GRB051008 - Swift UVOT upper limits
  58. Konus-Wind observation of GRB 051008
  59. GRB 051008: R-band upper limit
  60. GRB 051006: XRT refined analysis
  61. GRB 051006: optical observations at Sierra Nevada
  62. GRB 050906, summary of radio observations
  63. GRB 051001: I-band limit
  64. GRB 051001: AAT infra-red observations
  65. GRB 051001: Swift-BAT refined analysis
  66. GRB 051001: ROTSE-III Optical Limits
  67. GRB050908: optical observations
  68. GRB050922B: optical limit
  69. GRB050922C: UVES/VLT high resolution spectroscopy
  70. GRB050922C - Swift UVOT preliminary analysis
  71. GRB050925: Swift UVOT upper limits
  72. Refined analysis of the Swift-BAT soft short burst
  73. GRB050925: Faulkes Telescope North R-band limit
  74. GRB050925: Swift-BAT detection of a short burst
  75. GRB050922C: TNG spectroscopic observations
  76. Konus-Wind observation of GRB 050922C
  77. GRB050922B: Swift UVOT early upper limits.
  78. GRB OT observation
  79. GRB050922C: observation at MonteBoo
  80. GRB050922C: Optical Observations
  81. GRB 050922C: Swift XRT refined analysis
  82. GRB 050922C: Swift-BAT refined analysis
  83. GRB 050922B: Swift-BAT refined analysis
  84. GRB050922C: optical observations
  85. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  86. GRB 050922B: ROTSE-III Optical Limits
  87. GRB 050922B,optical observation
  88. GRB050922B: Swift-BAT detection of a weak long burst
  89. Possible GRB 050922 detected by INTEGRAL
  90. GRB050820B: analysis of the XMM-Newton observation
  91. GRB 050916: Swift-BAT refined analysis
  92. GRB 050918 - A long GRB detected by INTEGRAL
  93. GRB 050915b, SMARTS optical/IR observations of the XRT position
  94. GRB 050915B: Swift-BAT refined analysis
  95. GRB 050915: IR Observations
  96. GRB 050915: Swift XRT refined analysis
  97. GRB 050915: Swift-BAT refined analysis
  98. GRB050915: P60 Optical Observations
  99. GRB050915, optical observations
  100. GRB 050915: ROTSE-III optical limits

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