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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"

21907 results found.

  1. GRB 051021: MDM Upper Limit
  2. GRB 051022 (=H3950): SXC Flight Localization is Valid
  3. GRB051021: Swift/UVOT Upper Limits
  4. GRB 051022: SSO40 Optical Observations
  5. GRB051022,optical observation
  6. GRB 051022A: ROTSE-III Optical Limits
  7. GRB 051022: Optical observations
  8. GRB 051021,optical observation
  9. GRB 051021B: Swift detection of a burst
  10. Swift-BAT triggered on a posible CR Shower or possible GRB
  11. Afterglow candidate of GRB 051016B observed at Lulin
  12. GRB 051016A: Swift/UVOT upper limits
  13. GRB 051016B: Swift/UVOT detection
  14. GRB 051016B,optical observation
  15. GRB 051016B: Swift detection of a soft burst
  16. GRB051016 XMM-Newton observation
  17. GRB 051016: PROMPT Observations
  18. GRB051016: Swift detection of a burst
  19. GRB051006: optical observations
  20. GRB 051012: Swift-BAT detection of burst yesterday
  21. GRB 051006: Swift/UVOT Upper Limits
  22. GRB051011: MASTER optical observation
  23. Konus-Wind observation of GRB 051008
  24. GRB051008: Radio Observation
  25. GRB 051008, optical observations
  26. GRB 051008: early Swift XRT analysis
  27. GRB 051008: Swift UVOT Candidate
  28. GRB 051006: P60 Observations
  29. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  30. GRB051006: Refined analysis of the Swift-BAT burst
  31. GRB051006: Swift detection of a burst
  32. GRB 050906, summary of radio observations
  33. GRB051001: Swift UVOT Upper Limits
  34. GRB 051001: AAT infra-red observations
  35. GRB 051001: Swift Detection of a Burst
  36. GRB 051001: ROTSE-III Optical Limits
  37. GRB 050820A: NIR photometry at the TNG
  38. GRB/SGR 050925: IR Observations
  39. GRB050925: Swift UVOT upper limits
  40. GRB050925: Faulkes Telescope North R-band limit
  41. GRB050925: Swift-BAT detection of a short burst
  42. GRB050922C: TNG spectroscopic observations
  43. Konus-Wind observation of GRB 050922C
  44. GRB050922B: Swift UVOT early upper limits.
  45. GRB050922C: Optical Observations
  46. GRB 050922C: Swift-BAT refined analysis
  47. GRB 050922C: optical obserations
  48. GRB 050922C: NOT optical observations
  49. GRB 050922C: Swift detection of a bright burst
  50. GRB 050922C: ROTSE-IIId Refined Analysis
  51. GRB 050922B: ROTSE-III Optical Limits
  52. GRB 050922B,optical observation
  53. GRB050922B: Swift-BAT detection of a weak long burst
  54. GRB050918: Possible Swift/XRT detected afterglow
  55. GRB050820B: analysis of the XMM-Newton observation
  56. GRB050916: Swift/UVOT Upper Limits
  57. Swift-BAT trigger 155764 is not a GRB
  58. Swift-BAT trigger 155764 is probably not a GRB
  59. Swift trigger 155764: bad XRT centroid
  60. Swift-BAT trigger 155535 is definitely not a GRB
  61. GRB050916 : Swift-XRT refined analysis
  62. GRB 050915B: Swift/UVOT Upper Limits
  63. GRB 050915a: IR Transient
  64. GRB 050915b, SMARTS optical/IR observations
  65. GRB050915B: Swift-BAT detection of a long bright burst
  66. GRB050915: Swift/UVOT upper limits
  67. GRB 050915: IR Observations
  68. GRB 050915: ROTSE-III optical limits
  69. GRB 050915: Swift detection of a GRB
  70. Swift-BAT trigger 155072 ground analysis
  71. Swift-BAT trigger 155072 is probably not a GRB
  72. GRB 050911, optical observations
  73. GRB 050911: z~0.16 cluster in the field
  74. GRB050911: Swift-BAT detection of a long burst
  75. GRB 050910a: TAROT early optical limits
  76. GRB 050906: Possible X-ray Counterpart
  77. GRB050908: Swift/UVOT Early upper limits
  78. GRB050908 : Swift-XRT refined analysis
  79. GRB 050908: Optical observations
  80. GRB 050908: Optical Observations
  81. GRB 050908: Swift detection of a burst
  82. GRB 050906: Optical observations at the Very Large Telescope
  83. GRB 050904: Subaru Optical Spectroscopy
  84. GRB 050906: Swift XRT upper limit
  85. GRB 050904: Keck I-band Imaging
  86. GRB050906: P60 Observations
  87. GRB 050904: photometric redshift
  88. GRB 050904: Swift/UVOT observations
  89. GRB 050904: NIR object inside the XRT error box
  90. GRB050904: Optical Observations
  91. GRB050904: P60 Observations
  92. GRB 050904: TAROT optical limits
  93. GRB 050827: P200 NIR Observations
  94. GRB050827: Swift/UVOT upper limits
  95. GRB050824: Maidanak optical limits
  96. GRB050820A: RTT150 optical observations
  97. Subaru Observations of GRB050724
  98. GRB050826: Swift/UVOT early upper limits
  99. GRB050826: Swift-BAT detection of a long burst
  100. GRB050824: CORRECTION to UVOT observing times

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