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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"

36204 results found.

  1. GRB 081016B: ROTSE-III Optical Limits
  2. GRB 081016B: Swift detection of a burst
  3. GRB 081011: Enhanced Swift-XRT position
  4. GRB 081016: Swift-XRT candidate afterglow detection
  5. GRB 081016: A long GRB discovered by INTEGRAL
  6. Trigger 331721 Due to Swift startracker loss-of-lock
  7. GRB 081009: Fermi GBM detection
  8. GRB 081012: GROND upper limits
  9. GRB 081008: Galaxy associated with z=1.967 absorber
  10. GRB 081012: Fermi GBM detection
  11. GRB 081007 and GRB 081007B: Fermi GBM detection
  12. GRB 080430: optical observations
  13. GRB 081008 optical upper limit
  14. GRB 081012: Observations from NOT
  15. GRB 081012: Swift/UVOT analysis of initial observations
  16. GRB 081012: Swift/XRT detection
  17. GRB 081012, Swift-BAT refined analysis
  18. GRB 081012: ROTSE-III Optical Limits
  19. GRB 081012: Swift detection of a burst
  20. Revised table for GRB 081011 UVOT detections
  21. GRB081011: UVOT detection of an optical afterglow
  22. GRB 081011: Swift/XRT detection
  23. GRB 081011, Swift-BAT refined analysis
  24. GRB 081008, SMARTS optical/IR afterglow observations
  25. GRB 081011: Swift detection of a burst
  26. GRB 081007: Radio Detection
  27. Konus-Wind observation of GRB 081001
  28. GRB 081007: Rapid PROMPT Detections
  29. GRB 081008, Swift-BAT refined analysis
  30. GRB 081008: VLT redshift confirmation
  31. GRB 081008: Swift-XRT Refined Analysis
  32. GRB081008: Swift/UVOT observations
  33. GRB 081008: Enhanced Swift-XRT position
  34. GRB 081008: Gemini-South Absorption Redshiftt
  35. GRB 081008: VLT/FORS2 spectroscopy
  36. GRB 081008: Swift detection of a burst with optical afterglow
  37. GRB 081008: ROTSE-III Detection of Optical Counterpart
  38. GRB081006B: Fermi GBM detection
  39. GRB081006: Fermi GBM detection
  40. GRB081007: Swift/UVOT Observations
  41. GRB 081007, SMARTS optical afterglow observations
  42. GRB 081007, Swift-BAT refined analysis
  43. GRB 081007: Early RAPTOR measurements of optical counterpart
  44. GRB 081007: Swift-XRT Team refined analysis
  45. GRB 081007: Gemini-south redshift
  46. GRB 081007: Enhanced Swift-XRT position
  47. GRB 081007, Faulkes Telescope North optical observations
  48. GRB 081007, SMARTS optical/IR afterglow observations
  49. GRB 081007: REM NIR and optical counterpart
  50. GRB 081007: Swift detection of a burst with optical afterglow
  51. GRB081003C: GLAST Burst Monitor detection
  52. GRB 081003B: TAROT Calern observatory optical observations
  53. GRB 081003B: Swift-XRT upper limit
  54. GRB 081003A: OSN optical observations
  55. GRB 081001: Further observations from OSN
  56. GRB081003B: Optical limits from Spain
  57. GRB 081003A: Swift-XRT Team position and analysis
  58. GRB 081003B: a long GRB detected with INTEGRAL
  59. GRB 080928: Fermi GBM detection
  60. GRB 081003: A long GRB discovered by INTEGRAL
  61. GRB 081001: Observations from OSN
  62. GRB 080925: Suzaku WAM observation of the prompt emission
  63. GRB 081001: Swift UVOT Observations
  64. GRB 081001: Swift-XRT position
  65. GRB081001: optical limit from ASH-Centurion
  66. GRB081001: SuperAGILE Localization of a long GRB
  67. GRB080928: redshift retraction
  68. GRB 080928: Watcher observations
  69. GRB 080927: Fermi GBM detection
  70. GRB 080928: VLT redshift
  71. GRB080928: Gemini-South Absorption Redshift
  72. GRB 080928: Swift-XRT refined analysis
  73. GRB 080928: Swift/UVOT observations
  74. GRB 080928, Swift-BAT final refined analysis
  75. GRB 080928: GROND DETECTION
  76. GRB 080928: Enhanced Swift-XRT position
  77. GRB 080928, Swift-BAT initial refined analysis
  78. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  79. GRB 080928: Swift detection of a burst with an optical counterpart
  80. GRB 080925: Fermi GBM Detection
  81. GRB 080920: Fermi GBM detection
  82. Swift-BAT trigger 325707 is not a GRB
  83. Swift trigger 325707: Swift/UVOT Upper Limits
  84. Swift detection of a possible GRB (trigger 325707)
  85. GRB080916A: Suzaku WAM observation of the prompt emission
  86. GRB 080922: Swift/UVOT Upper Limits
  87. GRB080922: Swift-XRT upper limit
  88. GRB080922: A long GRB detected by INTEGRAL
  89. GRB 080913B: Fermi GBM detection
  90. GRB 080916C: Fermi GBM Spectral Analysis
  91. GRB 080919: Swift/UVOT Refined Analysis
  92. GRB 080919: Swift-XRT refined analysis
  93. GRB 080919, Swift-BAT refined analysis
  94. GRB 080916C: IRSF/SIRUS NIR Observation
  95. GRB 080916C: GROND Confirmation of the Optical Afterglow
  96. GRB 080916C: GROND Confirmation of the Optical Afterglow
  97. GRB 080919: REM NIR observations
  98. GRB 080919: Swift detection of a short burst
  99. GRB 080915A: GROND upper limits
  100. GRB 080916A: GROND lightcurve

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