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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').
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"

23709 results found.

  1. GRB051103:_MASTER_optical_observations
  2. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  3. GRB 051105: Swift-BAT improved refined analysis
  4. GRB051105B - A long GRB detected by INTEGRAL
  5. GRB 051105: Swift detection of a short burst
  6. IBAS Alert 2700: Not a GRB
  7. GRB051016B: optical observation
  8. Konus-Wind observation of GRB 051028
  9. GRB051028:MASTER correction and final results
  10. GRB051028: optical observations
  11. GRB051028:MASTER observations
  12. GRB051028:MASTER optical observations
  13. GRB051022: Swift XRT measurement of jet break
  14. SGR 1806-20: continued moderate activity seen with INTEGRAL
  15. GRB051021B: Swift/UVOT Upper limits
  16. GRB 051022: XRT Refined Spectral and Temporal Analysis
  17. GRB051012: Swift-XRT analysis
  18. GRB051021a: optical observations
  19. GRB 051022: Swift/UVOT Upper Limits
  20. GRB 051022: SOAR JKs Observations
  21. Konus-Wind observation of GRB 051022
  22. GRB051022: Optical Observations
  23. GRB 051021: PROMPT RcIc Observations
  24. GRB 051021, SMARTS optical/IR observations
  25. GRB 051022 (=H3950): SXC Flight Localization is Valid
  26. GRB051021: Swift/UVOT Upper Limits
  27. GRB 051022: SSO40 Optical Observations
  28. GRB051022,optical observation
  29. GRB 051022A: ROTSE-III Optical Limits
  30. GRB051022 (=H3590), A GRB Detected By HETE
  31. GRB 051021,optical observation
  32. GRB 051021: SOAR NIR Observations
  33. GRB051021: Swift XRT analysis
  34. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  35. GRB 051021: Optical observations and candidate afterglow
  36. GRB051021.63
  37. GRB051021.6: MASTER optical observation
  38. Swift-BAT trigger 160640 is not a real GRB
  39. GRB051021: A GRB Localized by HETE
  40. GRB 051016A: Swift/UVOT upper limits
  41. GRB 051016B: refined analysis of the Swift/XRT data
  42. GRB 051016: Swift-BAT refined analysis
  43. GRB051016: Swift XRT refined analysis.
  44. GRB 051016: PROMPT Observations
  45. GRB051006: optical observations
  46. GRB 051012: Swift-BAT detection of burst yesterday
  47. Swift-BAT Trigger 159578 is a possible burst
  48. GRB050805A: Rc optical observations
  49. IBAS Alert 2675 : not a GRB
  50. GRB051008: optical candidate
  51. GRB 051008: - a high redshift high-luminosity burst?
  52. GRB 051008 - a low redshift low-luminosity burst?
  53. IBAS Alert 2673: not a real GRB
  54. GRB051011: MASTER optical observation
  55. GRB051008: Swift XRT refined analysis
  56. GRB051008 - Swift UVOT upper limits
  57. Konus-Wind observation of GRB 051008
  58. GRB 051008: R-band upper limit
  59. GRB 051006: XRT refined analysis
  60. GRB 051006: optical observations at Sierra Nevada
  61. GRB 050906, summary of radio observations
  62. GRB 051001: I-band limit
  63. GRB 051001: AAT infra-red observations
  64. GRB 051001: Swift-BAT refined analysis
  65. GRB 051001: ROTSE-III Optical Limits
  66. GRB050908: optical observations
  67. GRB050922B: optical limit
  68. GRB050922C: UVES/VLT high resolution spectroscopy
  69. GRB050922C - Swift UVOT preliminary analysis
  70. GRB050925: Swift UVOT upper limits
  71. Refined analysis of the Swift-BAT soft short burst
  72. GRB050925: Faulkes Telescope North R-band limit
  73. GRB050925: Swift-BAT detection of a short burst
  74. GRB050922C: TNG spectroscopic observations
  75. Konus-Wind observation of GRB 050922C
  76. GRB050922B: Swift UVOT early upper limits.
  77. GRB OT observation
  78. GRB050922C: observation at MonteBoo
  79. GRB050922C: Optical Observations
  80. GRB 050922C: Swift XRT refined analysis
  81. GRB 050922C: Swift-BAT refined analysis
  82. GRB 050922B: Swift-BAT refined analysis
  83. GRB050922C: optical observations
  84. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  85. GRB 050922B: ROTSE-III Optical Limits
  86. GRB 050922B,optical observation
  87. GRB050922B: Swift-BAT detection of a weak long burst
  88. Possible GRB 050922 detected by INTEGRAL
  89. GRB050820B: analysis of the XMM-Newton observation
  90. GRB 050916: Swift-BAT refined analysis
  91. GRB 050918 - A long GRB detected by INTEGRAL
  92. GRB 050915b, SMARTS optical/IR observations of the XRT position
  93. GRB 050915B: Swift-BAT refined analysis
  94. GRB 050915: IR Observations
  95. GRB 050915: Swift XRT refined analysis
  96. GRB 050915: Swift-BAT refined analysis
  97. GRB050915: P60 Optical Observations
  98. GRB050915, optical observations
  99. GRB 050915: ROTSE-III optical limits
  100. GRB050911: Upper limit on X-ray afterglow

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