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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"

26771 results found.

  1. GRB081203A: Optical observations at Ishigaki
  2. GRB 081204: GROND Observations
  3. GRB 081204B: Fermi GBM detection
  4. GRB 081204: Swift XRT afterglow confirmation
  5. GRB081203A: MITSuME optical observation
  6. GRB 081203A: Skynet/GORT Detections
  7. GRB 081204: Swift XRT afterglow candidate
  8. Konus-Wind observation of GRB 081203A
  9. GRB081203A: Swift-XRT refined analysis
  10. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  11. Swift/UVOT detection of GRB081203B
  12. GRB 081203B: Swift-XRT candidate afterglow.
  13. Swift UVOT observations of GRB 081203A
  14. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  15. GRB081203A: Swift/UVOT grism redshift
  16. GRB 081203A: Burst detection from Swift-BAT slew data
  17. GRB 081203A: Swift-BAT refined analysis
  18. GRB 081130B: MASTER prompt optical observations
  19. GRB 081203: Swift detection of a burst with a bright optical counterpart
  20. GRB 081130B: Fermi GBM detection
  21. GRB 081130: Fermi GBM detection
  22. Swift Trigger 335971: Swift/UVOT Observations
  23. GRB 081126: Fermi GBM detection
  24. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  25. GRB 081129: Fermi GBM detection
  26. Swift Trigger 335971 is probably not a real source
  27. Trigger 335971: Swift possible detection of a burst
  28. GRB081128: Swift/UVOT Upper Limits
  29. SGR 1806-20: Fermi GBM detection.
  30. GRB 081122B: Fermi GBM Detection
  31. GRB 081128: Swift-XRT refined analysis
  32. GRB 081128: Swift-BAT refined analysis
  33. GRB 081128: Swift detection of a burst
  34. GRB 081126: GRT Optical Observation
  35. GRB 081127: Swift/UVOT Upper Limits
  36. GRB 081127: Swift-BAT refined analysis
  37. GRB 081126: Swift-XRT refined analysis
  38. GRB 081127: Swift detection of a burst
  39. GRB 081126: Swift/UVOT Observations
  40. GRB 081126: optical observations
  41. GRB 081126: Swift-BAT refined analysis
  42. GRB 081126: TAROT Calern observatory optical observations
  43. GRB 081126: Swift detection of a burst
  44. GRB 081125: Fermi GBM detection
  45. GRB 081124: Fermi GBM detection
  46. GRB 081120: Fermi GBM detection
  47. GRB 081118: Fermi GBM detection.
  48. GRB 081122: Fermi GBM detection
  49. Konus-Wind observation of GRB 081121
  50. GRB081121: Fermi GBM detection
  51. Fermi GBM detection of a weak source
  52. GRB081121: Refined Swift/UVOT observations
  53. GRB 081121: Swift-XRT refined analysis
  54. GRB 081121: GROND observations
  55. GRB 081121: Swift-BAT refined analysis
  56. GRB081121: Swift/UVOT observations
  57. GRB 081121: Swift detection of a burst
  58. GRB 081121: ROTSE-III Detection of Optical Counterpart
  59. GRB081118 : optical upper limit
  60. GRB 081119: Fermi GBM detection
  61. GRB 081118: Swift-XRT refined analysis
  62. GRB 081118: GROND detection of afterglow
  63. GRB 081118: Swift UVOT Upper Limits
  64. GRB 081118: Swift-BAT refined analysis
  65. GRB 081118: Swift detection of a burst
  66. Further Swift-XRT observations of the probable GRB 081105.
  67. GRB 081113: Fermi GBM detection
  68. GRB 081102: RTT150 Optical observations
  69. GRB 081110: Fermi GBM detection
  70. GRB 081110: MASTER: first optical observations Fermi GRB
  71. GRB 081109: TAROT La Silla observatory optical observations
  72. GRB 081102: MASTER refind and final results
  73. GRB 081109: GROND redshift limit and host extinction
  74. Swift-BAT refined analysis of trigger 334129
  75. GRB 081109B: Swift/UVOT refined analysis
  76. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  77. GRB 081109A: Possible Swift-UVOT detection
  78. GRB 081109A, Swift-BAT refined analysis
  79. GRB 081109A: Swift-XRT refined analysis
  80. GRB 081109: Fermi GBM detection
  81. GRB 081109: Swift/UVOT upper limits
  82. Swift-BAT Trigger 334129: possible burst
  83. GRB 081109: Swift detection of a burst
  84. GRB 081028 - PAIRITEL NIR detection
  85. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  86. SGR 1806-20: Fermi GBM detection
  87. GRB 081102B: Fermi GBM detection
  88. GRB 081105B: Fermi GBM detection
  89. GRB 081107: Fermi GBM detection
  90. GRB 081104: GROND found no Optical/NIR Afterglow
  91. GRB 081105: GROND Upper Limits
  92. Radio observation of GRB 080523 with ATCA
  93. Radio observation of GRB 080520 with ATCA
  94. UVOT/Swift observations of GRB081105
  95. Swift-XRT observations of GRB 081105
  96. GRB 081101B: Fermi GBM detection
  97. Radio observation of GRB 080516 with ATCA
  98. GRB 081105 Swift/BAT and IPN Localization
  99. GRB 081025: Fermi GBM observation
  100. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?

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