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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"

36217 results found.

  1. GRB 051016B: Swift detection of a soft burst
  2. GRB 051016: Swift-BAT refined analysis
  3. GRB051016: Swift XRT refined analysis.
  4. GRB 051016: LCO optical and near-IR imaging
  5. GRB 051016: PROMPT Observations
  6. GRB051016: Swift detection of a burst
  7. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  8. GRB051006: optical observations
  9. GRB 051012: Swift-BAT detection of burst yesterday
  10. Swift trigger 159578 is not a burst
  11. GRB 051006: Swift/UVOT Upper Limits
  12. IBAS Alert 2675 : not a GRB
  13. GRB051008: optical candidate
  14. GRB 051008: - a high redshift high-luminosity burst?
  15. GRB 051008 - a low redshift low-luminosity burst?
  16. IBAS Alert 2673: not a real GRB
  17. GRB051011: MASTER optical observation
  18. GRB051008: optical observation
  19. GRB051008: Swift XRT refined analysis
  20. GRB051008 - Swift UVOT upper limits
  21. Konus-Wind observation of GRB 051008
  22. GRB051008: Final refined analysis of the Swift-BAT burst
  23. GRB 051008: R-band upper limit
  24. GRB051008: Radio Observation
  25. GRB 051008: Swift XRT position
  26. GRB 051008, optical observations
  27. GRB 051008: early Swift XRT analysis
  28. GRB 051008: Swift UVOT Candidate
  29. GRB 051006: P60 Observations
  30. grb test
  31. GRB 051006: XRT refined analysis
  32. GRB 051006: optical observations at Sierra Nevada
  33. GRB 051006: XRT position
  34. GRB 050906, summary of radio observations
  35. GRB 050925: Second Epoch WSRT Radio Observations
  36. GRB 051001: Swift XRT refined analysis
  37. GRB 051001, optical observations at Mt. John
  38. GRB 051001: I-band limit
  39. GRB 051001: AAT infra-red observations
  40. GRB 051001: Swift-BAT refined analysis
  41. GRB 051001: Swift Detection of a Burst
  42. GRB 051001: ROTSE-III Optical Limits
  43. GRB050908: optical observations
  44. GRB050922C: optical observation
  45. GRB050922B: optical limit
  46. GRB 050922C: further VLT observations
  47. GRB 050820A: NIR photometry at the TNG
  48. GRB050922C: UVES/VLT high resolution spectroscopy
  49. GRB050925: Swift/XRT limits
  50. GRB/SGR 050925: IR Observations
  51. GRB 050922C: break in the lightcurve
  52. GRB 050925: WSRT Radio Observations
  53. GRB 050925 : I-band observation at Xinglong observatory
  54. GRB050925: Faulkes Telescope North R-band limit
  55. GRB050925: Swift-BAT detection of a short burst
  56. GRB 050922B: Correction to BAT refined analysis, longer burst
  57. GRB050922C: TNG spectroscopic observations
  58. GRB050922B: refined XRT analysis
  59. Konus-Wind observation of GRB 050922C
  60. GRB 050922C: Refined redshift
  61. GRB OT observation
  62. GRB050922C: observation at MonteBoo
  63. INT 2.5m limit for GRB050922B
  64. GRB 050922B: optical limit
  65. GRB050922C: Optical Observations
  66. GRB 050922C: Swift XRT refined analysis
  67. HETE Fregate observations of GRB 050922C
  68. GRB 050922C: Swift-BAT refined analysis
  69. GRB 050922B: Swift-BAT refined analysis
  70. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  71. GRB 050922C: optical obserations
  72. GRB 050922C: NOT optical observations
  73. GRB 050922A: Analysis of Swift/XRT TOO observation
  74. GRB 050922C: Swift detection of a bright burst
  75. GRB 050922C: ROTSE-IIId Refined Analysis
  76. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  77. GRB 050922B: ROTSE-III Optical Limits
  78. GRB 050922B,optical observation
  79. GRB050922B: Swift-BAT detection of a weak long burst
  80. Possible GRB 050922 detected by INTEGRAL
  81. GRB050820B: analysis of the XMM-Newton observation
  82. GRB050916: Swift/UVOT Upper Limits
  83. GRB 050916: Swift-BAT refined analysis
  84. GRB 050918 - A long GRB detected by INTEGRAL
  85. GRB 050915a: Radio Observations
  86. Swift-BAT trigger 155764 is not a GRB
  87. Swift-BAT trigger 155764 is probably not a GRB
  88. Swift-BAT trigger 155535 is definitely not a GRB
  89. GRB 050916: XRT position
  90. GRB 050915b, SMARTS optical/IR observations of the XRT position
  91. GRB 050915B: Swift-BAT refined analysis
  92. GRB 050915B: Swift/UVOT Upper Limits
  93. GRB 050915a: IR Transient
  94. GRB 050915B: XRT position
  95. GRB 050915b, SMARTS optical/IR observations
  96. GRB 050915: KAIT optical limit
  97. GRB 050915: IR Observations
  98. GRB 050915: Swift XRT refined analysis
  99. GRB 050915: Swift-BAT refined analysis
  100. GRB050915: P60 Optical Observations

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