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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"

27630 results found.

  1. GRB 071021: Swift detection of a burst
  2. GRB 071010B: Independent Confirmation of Break
  3. GRB 071020: Swift-XRT refined analysis
  4. GRB 071020, Swift-BAT refined analysis
  5. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  6. GRB071020 - SDSS Pre-burst Observations
  7. GRB 071020: Swift detection of a bright burst
  8. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  9. GRB 071018: Mercator Telescope optical observations
  10. Swift autonomous slewing re-enabled
  11. GRB 071018: SARA observations
  12. GRB 071018: Swift-XRT observation
  13. GRB 071017 - Swift XRT observations
  14. VLA radio observation of GRB 071018
  15. GRB 071018: Possible OT from Xinglong TNT observation
  16. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  17. GRB 071018, Swift-BAT refined analysis
  18. GRB 071018?: Swift detection of a possible burst
  19. GRB 071010B: Suzaku WAM observation of the prompt emission
  20. GRB 071013: 3rd TLS Epoch - constraints on variability
  21. GRB071013: optical observations
  22. GRB 071011: MITSuME Optical Observations
  23. GRB 070920A: deep optical observations at the NOT
  24. GRB 071010B: Photometry after 1.6 days
  25. GRB 071013: TLS Upper Limit
  26. GRB 071013: Optical observations
  27. GRB 071013, Swift-BAT refined analysis
  28. GRB071013: optical limit
  29. GRB 20071013: Xinglong TNT optical Upper Limit
  30. GRB 071013: Swift detection of a burst
  31. GRB 071010C Swift-BAT detection of a burst
  32. GRB 071011: Optical Limit after 13.95hrs
  33. GRB 071011: Swift-XRT refined analysis
  34. VLA non-detection of GRB 071010A
  35. GRB 071011: Confirmation of P60 optical afterglow
  36. GRB 071010B: Optical Detection
  37. GRB 071011: Kanazawa Optical limits
  38. GRB 071011: MARGE Optical Limits
  39. GRB 071010B: Super-LOTIS upper limit
  40. GRB 071011: XRT afterglow detection
  41. GRB 071011, Swift-BAT refined analysis
  42. GRB 071011: Early Super-LOTIS Observations
  43. GRB 071011: Optical afterglow candidate
  44. GRB 071011: Swift detection of a burst
  45. Konus-Wind observation of GRB 071010B
  46. GRB071010B: Swift/XRT detection
  47. GRB 071010B, Swift-BAT refined analysis
  48. GRB 071006, Swift-BAT refined analysis
  49. GRB071008: optical observations
  50. GRB 071010B possible optical transient
  51. GRB 071010A: Keck/LRIS Photometry
  52. GRB 071010B: Swift detection of a burst
  53. GRB 071010: Swift-XRT observation
  54. GRB 071008, Swift-BAT refined analysis
  55. GRB 071010, Swift-BAT refined analysis
  56. GRB071008: Swift-XRT observation
  57. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  58. GRB 071010: TAROT La Silla observatory detection of the afterglow
  59. GRB 071010: Swift detection of a burst
  60. GRB 071006 Swift-BAT detection of a burst
  61. GRB071008: IAC80 observation
  62. GRB 071008: Swift detection of a burst
  63. GRB 071003: XRT refined analysis
  64. GRB070920A: MAGIC telescope GeV observation
  65. Radio detection of GRB 071003 with the VLA
  66. GRB 070810B: further XRT analysis
  67. GRB 071003: Keck spectroscopy
  68. Konus-Wind observation of GRB 071003
  69. GRB071003: Faulkes Telescope North observations
  70. GRB 071003: Swift XRT position
  71. GRB 071003, Swift-BAT refined analysis
  72. GRB 071003: MARGE Observations
  73. GRB 071003: KAIT optical afterglow observations
  74. GRB 071003: Swift detection of a bright burst
  75. GRB 070714B: host galaxy spectroscopic redshift
  76. GRB 071001: Swift-XRT Team refined analysis
  77. GRB 071001, Swift-BAT refined analysis
  78. Faulkes Telescope South observations of GRB 071001
  79. GRB 071001: Swift detection of a burst
  80. VLA observation of GRB 070923
  81. GRB070925: Swift-XRT Position
  82. Update on Swift Status
  83. GRB 070920B: ROTSE-III Early Optical Limits
  84. Recent SGR1806-20 Activity
  85. GRB 070923, Swift-BAT refined analysis
  86. GRB 070920B: XRT observations
  87. GRB 070923: Galaxies within BAT localization
  88. GRB 070923: Swift detection of a short hard burst
  89. GRB 070917: Suzaku/WAM observation of the prompt emission
  90. GRB 070920B: TAROT La Silla observatory optical observations
  91. GRB 070920b: LCO optical observations
  92. GRB 070920B, Swift-BAT refined analysis
  93. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  94. GRB 070920B: NOT optical observations
  95. GRB 070920B: Swift detection of a burst
  96. GRB 070920, Swift-BAT refined analysis
  97. GRB 070920: TAROT Calern observatory optical observations
  98. GRB 070920: Swift detection of a burst
  99. SGR1806-20: Swift-BAT detection of enhanced activity
  100. GRB 070917: P60 Observations

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