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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"
  1. GRB 051016B: Refined analysis of the Swift-BAT burst
  2. GRB 051016B: Swift detection of a soft burst
  3. GRB 051016: Swift-BAT refined analysis
  4. GRB051016 XMM-Newton observation
  5. GRB051016: Swift XRT refined analysis.
  6. GRB051016: Planned XMM-Newton observation
  7. GRB 051016: LCO optical and near-IR imaging
  8. GRB 051016: PROMPT Observations
  9. GRB051016: Swift detection of a burst
  10. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  11. GRB051006: optical observations
  12. GRB 051012: Swift-BAT detection of burst yesterday
  13. Swift trigger 159578 is not a burst
  14. Swift-BAT Trigger 159578 is a possible burst
  15. GRB050805A: Rc optical observations
  16. GRB 051006: Swift/UVOT Upper Limits
  17. IBAS Alert 2675 : not a GRB
  18. GRB051008: optical candidate
  19. GRB 051008: - a high redshift high-luminosity burst?
  20. GRB 051008 - a low redshift low-luminosity burst?
  21. IBAS Alert 2673: not a real GRB
  22. GRB051011: bright nebulae near error box
  23. GRB051011: MASTER optical observation
  24. GRB051008: optical observation
  25. GRB051008: Swift XRT refined analysis
  26. GRB051008 - Swift UVOT upper limits
  27. Konus-Wind observation of GRB 051008
  28. GRB051008: Final refined analysis of the Swift-BAT burst
  29. GRB 051008: R-band upper limit
  30. GRB051008: Refined analysis of the Swift-BAT burst
  31. GRB051008: Radio Observation
  32. GRB 051008: Swift XRT position
  33. GRB 051008, optical observations
  34. GRB 051008: early Swift XRT analysis
  35. GRB 051008: Swift UVOT Candidate
  36. GRB051008: Swift-BAT detection of a bright burst
  37. GRB 051006: P60 Observations
  38. grb test
  39. GRB 051006: XRT refined analysis
  40. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  41. GRB 051006: optical observations at Sierra Nevada
  42. GRB051006: Refined analysis of the Swift-BAT burst
  43. GRB 051006: XRT position
  44. GRB051006: Swift detection of a burst
  45. GRB 050906, summary of radio observations
  46. Swift-BAT triggers 158261 and 158262 Retraction
  47. GRB051001: Swift UVOT Upper Limits
  48. GRB 050925: Second Epoch WSRT Radio Observations
  49. GRB 051001: Swift XRT refined analysis
  50. GRB 051001, optical observations at Mt. John
  51. GRB 051001: I-band limit
  52. GRB 051001: AAT infra-red observations
  53. GRB 051001: Swift-BAT refined analysis
  54. GRB 051001: Swift Detection of a Burst
  55. GRB 051001: ROTSE-III Optical Limits
  56. GRB050908: optical observations
  57. GRB050922C: optical observation
  58. GRB050922B: optical limit
  59. GRB 050922C: further VLT observations
  60. GRB 050820A: NIR photometry at the TNG
  61. GRB050922C: UVES/VLT high resolution spectroscopy
  62. GRB050925: Swift/XRT limits
  63. GRB/SGR 050925: IR Observations
  64. GRB050922C - Swift UVOT preliminary analysis
  65. GRB 050922C: break in the lightcurve
  66. GRB 050925: WSRT Radio Observations
  67. GRB050925: Swift UVOT upper limits
  68. Refined analysis of the Swift-BAT soft short burst
  69. GRB 050925 : I-band observation at Xinglong observatory
  70. GRB050925: Faulkes Telescope North R-band limit
  71. GRB050925: Swift-BAT detection of a short burst
  72. GRB 050922B: Correction to BAT refined analysis, longer burst
  73. GRB050922C: TNG spectroscopic observations
  74. GRB050922B: refined XRT analysis
  75. Konus-Wind observation of GRB 050922C
  76. GRB 050922C: Refined redshift
  77. GRB050922B: Swift UVOT early upper limits.
  78. GRB OT observation
  79. GRB050922C: observation at MonteBoo
  80. INT 2.5m limit for GRB050922B
  81. GRB 050922B: optical limit
  82. GRB050922C: Optical Observations
  83. GRB 050922C: Swift XRT refined analysis
  84. HETE Fregate observations of GRB 050922C
  85. GRB 050922C: Swift-BAT refined analysis
  86. GRB 050922B: Swift-BAT refined analysis
  87. GRB050922C: optical observations
  88. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  89. GRB 050922C: optical obserations
  90. GRB 050922C: NOT optical observations
  91. GRB 050922A: Analysis of Swift/XRT TOO observation
  92. GRB 050922C: Swift detection of a bright burst
  93. GRB 050922C: ROTSE-IIId Refined Analysis
  94. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  95. GRB 050922B: ROTSE-III Optical Limits
  96. GRB 050922B,optical observation
  97. GRB050922B: Swift-BAT detection of a weak long burst
  98. Possible GRB 050922 detected by INTEGRAL
  99. GRB050918: Possible Swift/XRT detected afterglow
  100. GRB050820B: analysis of the XMM-Newton observation

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