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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"

23619 results found.

  1. GRB 081126: afterglow photometry
  2. Trigger 335971: Swift possible detection of a burst
  3. GRB 081122B: Fermi GBM Detection
  4. GRB 081128: Swift-XRT refined analysis
  5. GRB081128: optical observations
  6. GRB 081128: Swift-BAT refined analysis
  7. GRB 081128: Swift detection of a burst
  8. GRB 081127: Swift-BAT refined analysis
  9. Konus-Wind observation of GRB 081126
  10. GRB 081127: Swift detection of a burst
  11. GRB 081126: optical observations
  12. GRB 081126: Swift-BAT refined analysis
  13. GRB 081126: TAROT Calern observatory optical observations
  14. GRB 081126: Swift detection of a burst
  15. GRB 081124: Fermi GBM detection
  16. GRB 081120: Fermi GBM detection
  17. GRB 081118: Fermi GBM detection.
  18. GRB 081122: Fermi GBM detection
  19. Konus-Wind observation of GRB 081121
  20. GRB 081121: Magellan Redshift
  21. GRB 081121: GROND observations
  22. GRB 081121: Swift-BAT refined analysis
  23. GRB 081121: Swift detection of a burst
  24. GRB 081119: Fermi GBM detection
  25. GRB 081118: GROND detection of afterglow
  26. GRB 081118: Swift-BAT refined analysis
  27. GRB 081118: Swift detection of a burst
  28. GRB 081109A: confirmation of possible detection host galaxy
  29. GRB 081102: RTT150 Optical observations
  30. GRB 081110: Fermi GBM detection
  31. GRB 081110: MASTER: first optical observations Fermi GRB
  32. GRB 081109: TAROT La Silla observatory optical observations
  33. GRB 081102: MASTER refind and final results
  34. GRB 081109B: Swift/UVOT refined analysis
  35. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  36. GRB 081109A: Possible Swift-UVOT detection
  37. GRB 081109A: Faulkes Telescope South observations
  38. GRB 081109A, Swift-BAT refined analysis
  39. GRB 081109: Swift/UVOT upper limits
  40. Swift-BAT Trigger 334129: possible burst
  41. GRB 081109: REM NIR afterglow detection
  42. GRB 081109: Swift detection of a burst
  43. GRB 081028 - PAIRITEL NIR detection
  44. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  45. SGR 1806-20: Fermi GBM detection
  46. GRB 081105: GROND Upper Limits
  47. GRB 081105 Swift/BAT and IPN Localization
  48. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  49. GRB 081104: Enhanced Swift-XRT position
  50. GRB 081104: Swift-BAT refined analysis
  51. GRB081104: Swift/UVOT Upper Limits
  52. GRB 081104 : Faulkes Telescope South observations
  53. GRB 081104: Swift detection of a burst
  54. GRB 081102: MASTER prompt optical limit
  55. GRB 081102: Swift-BAT refined analysis
  56. GRB 081102: MASTER VWF promt observation
  57. GRB 081102: Swift detection of a burst
  58. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  59. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  60. GRB 081024B: BTA deep optical observations
  61. GRB 081029: PROMPT Detections
  62. GRB 081029: Swift-BAT refined analysis
  63. GRB 081025: Suzaku WAM observation of the prompt emission
  64. GRB 081024B: Suzaku WAM observation of the prompt emission
  65. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  66. GRB 081029: Swift detection of a burst
  67. GRB 081028: Magellan redshift
  68. GRB 081028: Swift-XRT refined analysis
  69. GRB 081028, Swift-BAT refined analysis
  70. GRB 081028: TAROT Calern observatory optical observations
  71. GRB 081028: optical observations at the NOT
  72. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  73. GRB 081028: Swift detection of a burst
  74. GRB081025: RTT150 optical observations
  75. GRB081024B: P200 Observations
  76. Konus-Wind observation of GRB 081025
  77. Swift UVOT observations of GRB 081024
  78. GRB 081024, Swift-BAT refined analysis
  79. GRB 081024: Faulkes Telescope North optical observations
  80. GRB 081024: KAIT Optical Limits
  81. GRB 081024: Early Super-LOTIS Observations
  82. GRB 081024: Swift detection of a burst
  83. GRB 081022, Swift-BAT refined analysis
  84. GRB 081022: Swift detection of a burst
  85. Swift detection of a possible burst (trigger 332287)
  86. GRB 081017, Swift-BAT refined analysis
  87. GRB 081017: Swift detection of a burst
  88. GRB 081016B, Swift-BAT refined analysis
  89. GRB 081016B: Swift detection of a burst
  90. Swift detection of flare on CC Eri
  91. GRB 081016: A long GRB discovered by INTEGRAL
  92. Trigger 331721 Due to Swift startracker loss-of-lock
  93. Swift-BAT triggered on the flare star Algol
  94. GRB 081012: Swift/UVOT analysis of initial observations
  95. GRB 081012: Swift/XRT detection
  96. GRB 081012, Swift-BAT refined analysis
  97. GRB 081012: Swift detection of a burst
  98. GRB 081011, Swift-BAT refined analysis
  99. GRB 081011: Swift detection of a burst
  100. Konus-Wind observation of GRB 081001

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