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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"

36221 results found.

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

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