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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

37201 results found.

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

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