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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"

19605 results found.

  1. GRB071020, optical upper limit
  2. GRB 071025 Milagro GeV/TeV Observations
  3. Swift UVOT upper limits
  4. GRB 071025: Swift-XRT Team refined analysis
  5. GRB 071025, Swift-BAT refined analysis
  6. GRB 071025: Early Super-LOTIS Observations
  7. GRB 071025: ROTSE-III Refined Analysis
  8. GRB 071025: Swift XRT refined position
  9. GRB 071025: ROTSE-III Detection of Optical Counterpart
  10. GRB 071025: Swift detection of a burst
  11. GRB 071020: BTA spectroscopy
  12. Possible radio detection of GRB 071021 with the VLA
  13. Radio detection of GRB 071020 with the VLA
  14. GRB 071021: optical and NIR observations
  15. GRB 071021, Swift-BAT refined analysis
  16. GRB 071021: Swift-XRT Team refined analysis
  17. Konus-Wind observation of GRB 071020
  18. GRB 071021: Swift detection of a burst
  19. GRB 071020: Swift-XRT refined analysis
  20. GRB 071020, Swift-BAT refined analysis
  21. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  22. GRB071020 - SDSS Pre-burst Observations
  23. GRB 071020: Swift detection of a bright burst
  24. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  25. GRB 071018: Mercator Telescope optical observations
  26. Swift autonomous slewing re-enabled
  27. GRB 071018: Swift-XRT observation
  28. GRB 071017 - Swift XRT observations
  29. VLA radio observation of GRB 071018
  30. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  31. GRB 071018, Swift-BAT refined analysis
  32. GRB 071018?: Swift detection of a possible burst
  33. GRB 071010B: Suzaku WAM observation of the prompt emission
  34. GRB 071013: 3rd TLS Epoch - constraints on variability
  35. GRB 071013: TLS Upper Limit
  36. VLA detection of radio afterglow of GRB 071010B
  37. VLA non-detection of GRB 071011
  38. GRB 071013: Optical observations
  39. GRB 071013, Swift-BAT refined analysis
  40. GRB 071013: Swift detection of a burst
  41. GRB 071010C Swift-BAT detection of a burst
  42. GRB 071011: Swift-XRT refined analysis
  43. VLA non-detection of GRB 071010A
  44. GRB 071011, Optical afterglow
  45. GRB 071011: MARGE Optical Limits
  46. GRB 071011: XRT afterglow detection
  47. GRB 071011, Swift-BAT refined analysis
  48. GRB 071011: Early Super-LOTIS Observations
  49. GRB 071010B: Bright OT confirmed with TLS
  50. GRB 071011: Swift detection of a burst
  51. Optical Observation: GRB 071010
  52. Optical observations: GRB 071010A
  53. Konus-Wind observation of GRB 071010B
  54. GRB071010B: Swift/XRT detection
  55. GRB 071010B, Swift-BAT refined analysis
  56. GRB 071006, Swift-BAT refined analysis
  57. GRB 071010B: Swift detection of a burst
  58. GRB 071010: Swift-XRT observation
  59. GRB 071008, Swift-BAT refined analysis
  60. GRB 071010, Swift-BAT refined analysis
  61. GRB071008: Swift-XRT observation
  62. GRB 071010: TAROT La Silla observatory detection of the afterglow
  63. GRB 071010: Swift detection of a burst
  64. GRB 071006 Swift-BAT detection of a burst
  65. GRB071008: IAC80 observation
  66. GRB 071008: Swift detection of a burst
  67. GRB 071003: XRT refined analysis
  68. GRB070920A: MAGIC telescope GeV observation
  69. Radio detection of GRB 071003 with the VLA
  70. GRB 070810B: further XRT analysis
  71. Konus-Wind observation of GRB 071003
  72. GRB 071003: Swift XRT position
  73. GRB 071003, Swift-BAT refined analysis
  74. GRB 071003: MARGE Observations
  75. GRB 071003 Optical observations
  76. GRB 071003: KAIT optical afterglow observations
  77. GRB 071003: Swift detection of a bright burst
  78. GRB 070714B: host galaxy spectroscopic redshift
  79. GRB 071001: Swift-XRT Team refined analysis
  80. GRB 071001, Swift-BAT refined analysis
  81. Faulkes Telescope South observations of GRB 071001
  82. GRB 071001: Swift detection of a burst
  83. VLA observation of GRB 070923
  84. Disregard the Swift-XRT Notices today
  85. GRB070925: Swift-XRT Afterglow confirmation
  86. GRB070925: Swift-XRT Position
  87. Update on Swift Status
  88. GRB 070920B: ROTSE-III Early Optical Limits
  89. Recent SGR1806-20 Activity
  90. GRB 070923, Swift-BAT refined analysis
  91. GRB 070920B: XRT observations
  92. GRB 070923: Swift detection of a short hard burst
  93. GRB 070917: Suzaku/WAM observation of the prompt emission
  94. GRB 070920B: TAROT La Silla observatory optical observations
  95. GRB 070917: Confirmation of the X-ray afterglow
  96. GRB 070920B, Swift-BAT refined analysis
  97. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  98. GRB 070920B: NOT optical observations
  99. GRB 070920B: Swift detection of a burst
  100. GRB 070920, Swift-BAT refined analysis

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