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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"

28229 results found.

  1. GRB 081024B: VLA radio observation
  2. GRB 081029: UVOT Detection of the Optical Afterglow
  3. GRB 081029: Swift-BAT refined analysis
  4. GRB081029: Swift XRT refined analysis
  5. GRB 081025: Suzaku WAM observation of the prompt emission
  6. GRB 081029: Enhanced Swift-XRT position
  7. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  8. GRB 081029: REM observations
  9. Radio observation of GRB 080303 with ATCA
  10. Radio observation of GRB 080411 with ATCA
  11. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  12. GRB 081029: ROTSE-III Detection of Optical Counterpart
  13. GRB 081028B: Fermi GBM detection
  14. GRB 081021: Fermi GBM detection
  15. Swift UVOT observations of GRB081028
  16. GRB 081028: Swift-XRT refined analysis
  17. GRB 081028, Swift-BAT refined analysis
  18. GRB 081028: Enhanced Swift-XRT position
  19. GRB 081028: TAROT Calern observatory optical observations
  20. GRB 081028: optical observations at the NOT
  21. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  22. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  23. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  24. GRB 081028: Swift detection of a burst
  25. GRB 081024: No radio detection with the VLA
  26. GRB081025: RTT150 optical observations
  27. GRB081024B: P200 Observations
  28. GRB 081024B: Swift-XRT further observations
  29. GRB 081025 BAT refined analysis
  30. Swift UVOT observations of GRB081024B
  31. Konus-Wind observation of GRB 081025
  32. GRB 081025: Swift-XRT position
  33. GRB 081024B: Swift-XRT observations
  34. GRB 081025: Burst detection from Swift-BAT slew data
  35. GRB 081024: Swift-XRT refined analysis
  36. GRB 081024, Swift-BAT refined analysis
  37. GRB 081024: Enhanced Swift-XRT position
  38. GRB 081024: Faulkes Telescope North optical observations
  39. GRB 081024A: ROTSE-III Optical Limits
  40. GRB 081024: Swift detection of a burst
  41. GRB 081022, Swift-BAT refined analysis
  42. GRB 081016A: Swift-XRT refined analysis
  43. Swift detection of a possible burst (trigger 332287)
  44. GRB 081017, Swift-BAT refined analysis
  45. GRB 081017: REM early observations
  46. GRB 081016B, Swift-BAT refined analysis
  47. GRB 081011: Swift XRT refined analysis
  48. GRB 081016B: Swift-XRT Team 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. GRB 081016: A long GRB discovered by INTEGRAL
  55. Trigger 331721 Due to Swift startracker loss-of-lock
  56. Detection of flare star Algol in Swift-BAT slew data
  57. GRB 081009: Fermi GBM detection
  58. GRB 081012: GROND upper limits
  59. Swift-BAT triggered on the flare star Algol
  60. GRB 081012: Fermi GBM detection
  61. GRB 081007 and GRB 081007B: Fermi GBM detection
  62. GRB 080430: optical observations
  63. GRB 081012: Observations from NOT
  64. GRB 081012: Swift/XRT detection
  65. GRB 081012, Swift-BAT refined analysis
  66. GRB081011: UVOT detection of an optical afterglow
  67. GRB 081011: Swift/XRT detection
  68. GRB 081011, Swift-BAT refined analysis
  69. GRB 081008, SMARTS optical/IR afterglow observations
  70. GRB 081011: Swift detection of a burst
  71. GRB 081007: Radio Detection
  72. GRB 081008, Swift-BAT refined analysis
  73. GRB 081008: Swift-XRT Refined Analysis
  74. GRB081008: Swift/UVOT observations
  75. GRB 081008: Enhanced Swift-XRT position
  76. GRB 081008: Swift detection of a burst with optical afterglow
  77. GRB 081008: ROTSE-III Detection of Optical Counterpart
  78. GRB081006B: Fermi GBM detection
  79. GRB081006: Fermi GBM detection
  80. GRB081007: Swift/UVOT Observations
  81. GRB 081007, SMARTS optical afterglow observations
  82. GRB 081007, Swift-BAT refined analysis
  83. GRB 081007: Early RAPTOR measurements of optical counterpart
  84. GRB 081007: Swift-XRT Team refined analysis
  85. GRB 081007: Enhanced Swift-XRT position
  86. GRB 081007, Faulkes Telescope North optical observations
  87. GRB 081007: REM NIR and optical counterpart
  88. GRB 081007: Swift detection of a burst with optical afterglow
  89. GRB081003C: GLAST Burst Monitor detection
  90. GRB 081003B: TAROT Calern observatory optical observations
  91. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  92. GRB 081003B: Swift-XRT upper limit
  93. GRB 081003A: OSN optical observations
  94. GRB 081001: Further observations from OSN
  95. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  96. GRB 081003A: Swift-XRT Team position and analysis
  97. GRB 081003B: a long GRB detected with INTEGRAL
  98. GRB 080928: Fermi GBM detection
  99. GRB 081003: A long GRB discovered by INTEGRAL
  100. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)

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