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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"

21817 results found.

  1. GRB 081102: Swift-XRT refined analysis
  2. GRB 081102: Swift/UVOT refined analysis
  3. GRB 081102: Enhanced Swift-XRT position
  4. Radio observation of GRB 080218b with ATCA
  5. Radio observation of GRB 080229a with ATCA
  6. GRB 081102: MASTER VWF promt observation
  7. GRB 081102: Swift detection of a burst
  8. SGR 0501+4516: optical observations in August
  9. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  10. GRB 081024B: BTA deep optical observations
  11. GRB 081024B: new Swift-XRT observations
  12. Radio observation of GRB 080229b with ATCA
  13. GRB 081024B: VLA radio observation
  14. GRB 081029: UVOT Detection of the Optical Afterglow
  15. GRB 081025: Suzaku WAM observation of the prompt emission
  16. GRB 081024B: Suzaku WAM observation of the prompt emission
  17. GRB 081029: Enhanced Swift-XRT position
  18. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  19. GRB 081029: REM observations
  20. Radio observation of GRB 080303 with ATCA
  21. Radio observation of GRB 080411 with ATCA
  22. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  23. Swift UVOT observations of GRB081028
  24. GRB 081028: Enhanced Swift-XRT position
  25. GRB 081028: TAROT Calern observatory optical observations
  26. GRB 081028: optical observations at the NOT
  27. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  28. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  29. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  30. GRB 081028: Swift detection of a burst
  31. GRB 081024: No radio detection with the VLA
  32. GRB081025: RTT150 optical observations
  33. GRB081024B: P200 Observations
  34. GRB 081024B: Swift-XRT further observations
  35. Swift UVOT observations of GRB081024B
  36. GRB 081025: Swift-XRT position
  37. GRB 081024B: Swift-XRT observations
  38. GRB 081025: Burst detection from Swift-BAT slew data
  39. Fermi-LAT observation of GRB 081024B
  40. GRB 081024: Enhanced Swift-XRT position
  41. GRB 081024: Faulkes Telescope North optical observations
  42. GRB 081024: Early Super-LOTIS Observations
  43. GRB 081024A: ROTSE-III Optical Limits
  44. GRB 081024: Swift detection of a burst
  45. GRB 081016A: Swift-XRT refined analysis
  46. Swift detection of a possible burst (trigger 332287)
  47. GRB 081017: REM early observations
  48. GRB 081011: Swift XRT refined analysis
  49. GRB 081016B: Enhanced Swift-XRT position
  50. GRB 081016B: ROTSE-III Optical Limits
  51. GRB 081016B: Swift detection of a burst
  52. GRB 081011: Enhanced Swift-XRT position
  53. Swift detection of flare on CC Eri
  54. Trigger 331721 Due to Swift startracker loss-of-lock
  55. Detection of flare star Algol in Swift-BAT slew data
  56. GRB 081012: GROND upper limits
  57. Swift-BAT triggered on the flare star Algol
  58. GRB 081012: Observations from NOT
  59. GRB 081012: Swift/XRT detection
  60. GRB081011: UVOT detection of an optical afterglow
  61. GRB 081011: Swift/XRT detection
  62. GRB 081008, SMARTS optical/IR afterglow observations
  63. GRB 081011: Swift detection of a burst
  64. GRB 081007: Radio Detection
  65. GRB081008: Swift/UVOT observations
  66. GRB 081008: Enhanced Swift-XRT position
  67. GRB 081008: Swift detection of a burst with optical afterglow
  68. GRB081007: Swift/UVOT Observations
  69. GRB 081007, SMARTS optical afterglow observations
  70. GRB 081007: Early RAPTOR measurements of optical counterpart
  71. GRB 081007: Enhanced Swift-XRT position
  72. GRB 081007, Faulkes Telescope North optical observations
  73. GRB 081007: REM NIR and optical counterpart
  74. GRB 081007: Swift detection of a burst with optical afterglow
  75. GRB 081003B: TAROT Calern observatory optical observations
  76. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  77. GRB 081003A: OSN optical observations
  78. GRB 081001: Further observations from OSN
  79. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  80. GRB 081003A: Swift-XRT Team position and analysis
  81. GRB 080928: Fermi GBM detection
  82. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  83. Trigger 330353: Swift detection of a Galactic short soft burst
  84. GRB 081001: Observations from OSN
  85. GRB 080925: Suzaku WAM observation of the prompt emission
  86. GRB 081001: Swift UVOT Observations
  87. GRB 081001: Swift-XRT position
  88. GRB 080928: Watcher observations
  89. GRB 080928: Swift-XRT refined analysis
  90. GRB 080928: GROND DETECTION
  91. GRB 080928: Enhanced Swift-XRT position
  92. GRB 080928: Swift detection of a burst with an optical counterpart
  93. GRB 080925: Fermi GBM Detection
  94. GRB080922, optical upper limit
  95. Swift trigger 325707: Swift/UVOT Upper Limits
  96. Swift trigger 325707: Swift-XRT upper limit
  97. Swift detection of a possible GRB (trigger 325707)
  98. GRB080916A: Suzaku WAM observation of the prompt emission
  99. GRB 080922: Swift/UVOT Upper Limits
  100. Trigger 324561: IGR J08408-4503 detected by Swift

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