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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"

36310 results found.

  1. GRB 081017: Swift detection of a burst
  2. GRB 081016B, Swift-BAT refined analysis
  3. GRB 081016B: Swift/UVOT Upper Limits
  4. GRB 081011: Swift XRT refined analysis
  5. GRB 081016B: Swift-XRT Team refined Analysis
  6. GRB 081016B: Enhanced Swift-XRT position
  7. GRB 081016B: ROTSE-III Optical Limits
  8. GRB 081016B: Swift detection of a burst
  9. GRB 081011: Enhanced Swift-XRT position
  10. GRB 081016: Swift-XRT candidate afterglow detection
  11. GRB 081016: A long GRB discovered by INTEGRAL
  12. Trigger 331721 Due to Swift startracker loss-of-lock
  13. GRB 081009: Fermi GBM detection
  14. GRB 081012: GROND upper limits
  15. GRB 081008: Galaxy associated with z=1.967 absorber
  16. GRB 081012: Fermi GBM detection
  17. GRB 081007 and GRB 081007B: Fermi GBM detection
  18. GRB 080430: optical observations
  19. GRB 081008 optical upper limit
  20. GRB 081012: Observations from NOT
  21. GRB 081012: Swift/UVOT analysis of initial observations
  22. GRB 081012: Swift/XRT detection
  23. GRB 081012, Swift-BAT refined analysis
  24. GRB 081012: ROTSE-III Optical Limits
  25. GRB 081012: Swift detection of a burst
  26. Revised table for GRB 081011 UVOT detections
  27. GRB081011: UVOT detection of an optical afterglow
  28. GRB 081011: Swift/XRT detection
  29. GRB 081011, Swift-BAT refined analysis
  30. GRB 081008, SMARTS optical/IR afterglow observations
  31. GRB 081011: Swift detection of a burst
  32. GRB 081007: Radio Detection
  33. Konus-Wind observation of GRB 081001
  34. GRB 081007: Rapid PROMPT Detections
  35. GRB 081008, Swift-BAT refined analysis
  36. GRB 081008: VLT redshift confirmation
  37. GRB 081008: Swift-XRT Refined Analysis
  38. GRB081008: Swift/UVOT observations
  39. GRB 081008: Enhanced Swift-XRT position
  40. GRB 081008: Gemini-South Absorption Redshiftt
  41. GRB 081008: VLT/FORS2 spectroscopy
  42. GRB 081008: Swift detection of a burst with optical afterglow
  43. GRB 081008: ROTSE-III Detection of Optical Counterpart
  44. GRB081006B: Fermi GBM detection
  45. GRB081006: Fermi GBM detection
  46. GRB081007: Swift/UVOT Observations
  47. GRB 081007, SMARTS optical afterglow observations
  48. GRB 081007, Swift-BAT refined analysis
  49. GRB 081007: Early RAPTOR measurements of optical counterpart
  50. GRB 081007: Swift-XRT Team refined analysis
  51. GRB 081007: Gemini-south redshift
  52. GRB 081007: Enhanced Swift-XRT position
  53. GRB 081007, Faulkes Telescope North optical observations
  54. GRB 081007, SMARTS optical/IR afterglow observations
  55. GRB 081007: REM NIR and optical counterpart
  56. GRB 081007: Swift detection of a burst with optical afterglow
  57. GRB081003C: GLAST Burst Monitor detection
  58. GRB 081003B: TAROT Calern observatory optical observations
  59. GRB 081003B: Swift-XRT upper limit
  60. GRB 081003A: OSN optical observations
  61. GRB 081001: Further observations from OSN
  62. GRB081003B: Optical limits from Spain
  63. GRB 081003A: Swift-XRT Team position and analysis
  64. GRB 081003B: a long GRB detected with INTEGRAL
  65. GRB 080928: Fermi GBM detection
  66. GRB 081003: A long GRB discovered by INTEGRAL
  67. GRB 081001: Observations from OSN
  68. GRB 080925: Suzaku WAM observation of the prompt emission
  69. GRB 081001: Swift UVOT Observations
  70. GRB 081001: Swift-XRT position
  71. GRB081001: optical limit from ASH-Centurion
  72. GRB081001: SuperAGILE Localization of a long GRB
  73. GRB080928: redshift retraction
  74. GRB 080928: Watcher observations
  75. GRB 080927: Fermi GBM detection
  76. GRB 080928: VLT redshift
  77. GRB080928: Gemini-South Absorption Redshift
  78. GRB 080928: Swift-XRT refined analysis
  79. GRB 080928: Swift/UVOT observations
  80. GRB 080928, Swift-BAT final refined analysis
  81. GRB 080928: GROND DETECTION
  82. GRB 080928: Enhanced Swift-XRT position
  83. GRB 080928, Swift-BAT initial refined analysis
  84. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  85. GRB 080928: Swift detection of a burst with an optical counterpart
  86. GRB 080925: Fermi GBM Detection
  87. GRB 080920: Fermi GBM detection
  88. Swift-BAT trigger 325707 is not a GRB
  89. Swift trigger 325707: Swift/UVOT Upper Limits
  90. Swift detection of a possible GRB (trigger 325707)
  91. GRB080916A: Suzaku WAM observation of the prompt emission
  92. GRB 080922: Swift/UVOT Upper Limits
  93. GRB080922: Swift-XRT upper limit
  94. GRB080922: A long GRB detected by INTEGRAL
  95. GRB 080913B: Fermi GBM detection
  96. GRB 080916C: Fermi GBM Spectral Analysis
  97. GRB 080919: Swift/UVOT Refined Analysis
  98. GRB 080919: Swift-XRT refined analysis
  99. GRB 080919, Swift-BAT refined analysis
  100. GRB 080916C: IRSF/SIRUS NIR Observation

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Download all Circulars as a .tar.gz archive (updated once a day):
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