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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19415 results found.

  1. GRB 071028: Swift-XRT Team refined analysis
  2. GRB 071028, Swift-BAT refined analysis
  3. GRB 071028: Swift detection of a burst
  4. GRB 071025: Kuiper Telescope Optical Observations
  5. GRB 071018: Revised BAT position
  6. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  7. GRB071021: MARGE Optical Limits
  8. GRB071020, optical upper limit
  9. GRB 071025 Milagro GeV/TeV Observations
  10. Swift UVOT upper limits
  11. GRB 071025: Swift-XRT Team refined analysis
  12. GRB 071025, Swift-BAT refined analysis
  13. GRB 071025: Early Super-LOTIS Observations
  14. GRB 071025: ROTSE-III Refined Analysis
  15. GRB 071025: Swift XRT refined position
  16. GRB 071025: ROTSE-III Detection of Optical Counterpart
  17. GRB 071025: Swift detection of a burst
  18. GRB 071020: BTA spectroscopy
  19. Possible radio detection of GRB 071021 with the VLA
  20. Radio detection of GRB 071020 with the VLA
  21. GRB 071021: optical and NIR observations
  22. GRB 071021, Swift-BAT refined analysis
  23. GRB 071021: Swift-XRT Team refined analysis
  24. Konus-Wind observation of GRB 071020
  25. GRB 071021: Swift detection of a burst
  26. GRB 071020: Swift-XRT refined analysis
  27. GRB 071020, Swift-BAT refined analysis
  28. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  29. GRB071020 - SDSS Pre-burst Observations
  30. GRB 071020: Swift detection of a bright burst
  31. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  32. GRB 071018: Mercator Telescope optical observations
  33. Swift autonomous slewing re-enabled
  34. GRB 071018: Swift-XRT observation
  35. GRB 071017 - Swift XRT observations
  36. VLA radio observation of GRB 071018
  37. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  38. GRB 071018, Swift-BAT refined analysis
  39. GRB 071018?: Swift detection of a possible burst
  40. GRB 071010B: Suzaku WAM observation of the prompt emission
  41. GRB 071013: 3rd TLS Epoch - constraints on variability
  42. GRB 071013: TLS Upper Limit
  43. VLA detection of radio afterglow of GRB 071010B
  44. VLA non-detection of GRB 071011
  45. GRB 071013: Optical observations
  46. GRB 071013, Swift-BAT refined analysis
  47. GRB 071013: Swift detection of a burst
  48. GRB 071010C Swift-BAT detection of a burst
  49. GRB 071011: Swift-XRT refined analysis
  50. VLA non-detection of GRB 071010A
  51. GRB 071011, Optical afterglow
  52. GRB 071011: MARGE Optical Limits
  53. GRB 071011: XRT afterglow detection
  54. GRB 071011, Swift-BAT refined analysis
  55. GRB 071011: Early Super-LOTIS Observations
  56. GRB 071010B: Bright OT confirmed with TLS
  57. GRB 071011: Swift detection of a burst
  58. Optical Observation: GRB 071010
  59. Optical observations: GRB 071010A
  60. Konus-Wind observation of GRB 071010B
  61. GRB071010B: Swift/XRT detection
  62. GRB 071010B, Swift-BAT refined analysis
  63. GRB 071006, Swift-BAT refined analysis
  64. GRB 071010B: Swift detection of a burst
  65. GRB 071010: Swift-XRT observation
  66. GRB 071008, Swift-BAT refined analysis
  67. GRB 071010, Swift-BAT refined analysis
  68. GRB071008: Swift-XRT observation
  69. GRB 071010: TAROT La Silla observatory detection of the afterglow
  70. GRB 071010: Swift detection of a burst
  71. GRB 071006 Swift-BAT detection of a burst
  72. GRB071008: IAC80 observation
  73. GRB 071008: Swift detection of a burst
  74. GRB 071003: XRT refined analysis
  75. GRB070920A: MAGIC telescope GeV observation
  76. Radio detection of GRB 071003 with the VLA
  77. GRB 070810B: further XRT analysis
  78. Konus-Wind observation of GRB 071003
  79. GRB 071003: Swift XRT position
  80. GRB 071003, Swift-BAT refined analysis
  81. GRB 071003: MARGE Observations
  82. GRB 071003 Optical observations
  83. GRB 071003: KAIT optical afterglow observations
  84. GRB 071003: Swift detection of a bright burst
  85. GRB 070714B: host galaxy spectroscopic redshift
  86. GRB 071001: Swift-XRT Team refined analysis
  87. GRB 071001, Swift-BAT refined analysis
  88. Faulkes Telescope South observations of GRB 071001
  89. GRB 071001: Swift detection of a burst
  90. VLA observation of GRB 070923
  91. Disregard the Swift-XRT Notices today
  92. GRB070925: Swift-XRT Afterglow confirmation
  93. GRB070925: Swift-XRT Position
  94. Update on Swift Status
  95. GRB 070920B: ROTSE-III Early Optical Limits
  96. Recent SGR1806-20 Activity
  97. GRB 070923, Swift-BAT refined analysis
  98. GRB 070920B: XRT observations
  99. GRB 070923: Swift detection of a short hard burst
  100. GRB 070917: Suzaku/WAM observation of the prompt emission

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