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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"

23558 results found.

  1. GRB 081124: Fermi GBM detection
  2. GRB 081120: Fermi GBM detection
  3. GRB 081118: Fermi GBM detection.
  4. GRB 081122: Fermi GBM detection
  5. GRB 081121, SMARTS optical/IR afterglow observations
  6. GRB081121: Refined Swift/UVOT observations
  7. GRB 081121: Swift-XRT refined analysis
  8. GRB 081121: Enhanced Swift-XRT position
  9. GRB 081121: GROND observations
  10. GRB081121: Swift/UVOT observations
  11. GRB 081121: Swift detection of a burst
  12. GRB081118 : optical upper limit
  13. GRB 081119: Fermi GBM detection
  14. VLA Radio upper limit on GRB 081118
  15. GRB 081118: Swift-XRT refined analysis
  16. GRB 081118: GROND detection of afterglow
  17. GRB 081118: optical afterglow candidate
  18. GRB 081118: Swift UVOT Upper Limits
  19. GRB 081118: Enhanced Swift-XRT position
  20. GRB 081118: Swift detection of a burst
  21. GRB 081109A: confirmation of possible detection host galaxy
  22. Further Swift-XRT observations of the probable GRB 081105.
  23. GRB 081113: Fermi GBM detection
  24. GRB 081102: RTT150 Optical observations
  25. GRB 081110: Fermi GBM detection
  26. GRB 081109: TAROT La Silla observatory optical observations
  27. GRB 081102: MASTER refind and final results
  28. GRB 081109: GROND redshift limit and host extinction
  29. GRB 081025: Swift-XRT further analysis
  30. GRB 081024B: Swift-XRT late-time observations
  31. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  32. GRB 081109A: Possible Swift-UVOT detection
  33. GRB 081109A: Swift-XRT refined analysis
  34. GRB 081109: Swift/UVOT upper limits
  35. Swift-BAT Trigger 334129: possible burst
  36. GRB 081109: REM NIR afterglow detection
  37. GRB 081109: Swift detection of a burst
  38. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  39. GRB 081102B: Fermi GBM detection
  40. GRB 081105B: Fermi GBM detection
  41. GRB 081107: Fermi GBM detection
  42. GRB 081104: GROND found no Optical/NIR Afterglow
  43. GRB 081105: GROND Upper Limits
  44. Radio observation of GRB 080523 with ATCA
  45. Radio observation of GRB 080520 with ATCA
  46. GRB 081105: Observations from OSN
  47. UVOT/Swift observations of GRB081105
  48. Swift-XRT observations of GRB 081105
  49. GRB 081101B: Fermi GBM detection
  50. Radio observation of GRB 080516 with ATCA
  51. GRB 081105 Swift/BAT and IPN Localization
  52. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  53. GRB 081104: refined XRT analysis
  54. GRB 081104: Enhanced Swift-XRT position
  55. GRB081104: Swift/UVOT Upper Limits
  56. GRB 081104 : Faulkes Telescope South observations
  57. GRB 081104: Swift detection of a burst
  58. Radio observation of GRB 080130 with ATCA
  59. GRB 081102: MASTER prompt optical limit
  60. GRB 081102: Swift-XRT refined analysis
  61. GRB 081102: Swift/UVOT refined analysis
  62. GRB 081102: Enhanced Swift-XRT position
  63. Radio observation of GRB 080218b with ATCA
  64. Radio observation of GRB 080229a with ATCA
  65. GRB 081102: MASTER VWF promt observation
  66. GRB 081102: Swift detection of a burst
  67. SGR 0501+4516: optical observations in August
  68. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  69. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  70. GRB 081024B: BTA deep optical observations
  71. GRB 081024B: new Swift-XRT observations
  72. Radio observation of GRB 080229b with ATCA
  73. GRB 081024B: VLA radio observation
  74. GRB 081029: UVOT Detection of the Optical Afterglow
  75. GRB081029: Swift XRT refined analysis
  76. GRB 081029: Enhanced Swift-XRT position
  77. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  78. GRB 081029: REM observations
  79. Radio observation of GRB 080303 with ATCA
  80. Radio observation of GRB 080411 with ATCA
  81. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  82. GRB 081029: Swift detection of a burst
  83. GRB 081028B: Fermi GBM detection
  84. GRB 081021: Fermi GBM detection
  85. GRB081028: UVOT detection of a brightening afterglow
  86. Swift UVOT observations of GRB081028
  87. GRB 081028: Swift-XRT refined analysis
  88. GRB 081028: Enhanced Swift-XRT position
  89. GRB 081028: TAROT Calern observatory optical observations
  90. GRB 081028: optical observations at the NOT
  91. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  92. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  93. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  94. GRB 081028: Swift detection of a burst
  95. GRB 081024: No radio detection with the VLA
  96. GRB081025: RTT150 optical observations
  97. GRB081024B: P200 Observations
  98. GRB 081024B: Swift-XRT further observations
  99. GRB 081025 BAT refined analysis
  100. Swift UVOT observations of GRB081025

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