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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"

32690 results found.

  1. GRB 081024B: Swift-XRT observations
  2. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  3. Swift UVOT observations of GRB 081024
  4. GRB 081024: Swift-XRT refined analysis
  5. GRB 081024, Swift-BAT refined analysis
  6. GRB 081024: Faulkes Telescope North optical observations
  7. GRB 081024: KAIT Optical Limits
  8. GRB 081024: Early Super-LOTIS Observations
  9. GRB 081024A: ROTSE-III Optical Limits
  10. GRB 081022, Swift-BAT refined analysis
  11. GRB 081016A: Swift-XRT refined analysis
  12. GRB 081012: Swift-XRT Refined Analysis
  13. Swift trigger 332287 is not a GRB
  14. GRB 081017, Swift-BAT refined analysis
  15. GRB 081017: REM early observations
  16. GRB 081016B, Swift-BAT refined analysis
  17. GRB 081016B: Swift/UVOT Upper Limits
  18. GRB 081011: Swift XRT refined analysis
  19. GRB 081016B: Swift-XRT Team refined Analysis
  20. GRB 081016B: ROTSE-III Optical Limits
  21. GRB 081016: Swift-XRT candidate afterglow detection
  22. Detection of flare star Algol in Swift-BAT slew data
  23. GRB 081012: GROND upper limits
  24. GRB 081008: Galaxy associated with z=1.967 absorber
  25. GRB 081012: Fermi GBM detection
  26. GRB 081007 and GRB 081007B: Fermi GBM detection
  27. GRB 080430: optical observations
  28. GRB 081008 optical upper limit
  29. GRB 081012: Observations from NOT
  30. GRB 081012: Swift/UVOT analysis of initial observations
  31. GRB 081012: Swift/XRT detection
  32. GRB 081012, Swift-BAT refined analysis
  33. GRB 081012: ROTSE-III Optical Limits
  34. Revised table for GRB 081011 UVOT detections
  35. GRB081011: UVOT detection of an optical afterglow
  36. GRB 081011: Swift/XRT detection
  37. GRB 081011, Swift-BAT refined analysis
  38. GRB 081008, SMARTS optical/IR afterglow observations
  39. GRB 081007: Radio Detection
  40. Konus-Wind observation of GRB 081001
  41. GRB 081007: Rapid PROMPT Detections
  42. GRB 081008, Swift-BAT refined analysis
  43. GRB 081008: VLT redshift confirmation
  44. GRB 081008: Swift-XRT Refined Analysis
  45. GRB081008: Swift/UVOT observations
  46. GRB 081008: Gemini-South Absorption Redshiftt
  47. GRB 081008: VLT/FORS2 spectroscopy
  48. GRB 081008: ROTSE-III Detection of Optical Counterpart
  49. GRB081007: Swift/UVOT Observations
  50. GRB 081007, SMARTS optical afterglow observations
  51. GRB 081007, Swift-BAT refined analysis
  52. GRB 081007: Early RAPTOR measurements of optical counterpart
  53. GRB 081007: Swift-XRT Team refined analysis
  54. GRB 081007: Gemini-south redshift
  55. GRB 081007, Faulkes Telescope North optical observations
  56. GRB 081007, SMARTS optical/IR afterglow observations
  57. GRB 081007: REM NIR and optical counterpart
  58. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  59. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  60. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  61. GRB 081003B: Swift-XRT upper limit
  62. GRB 081003A: OSN optical observations
  63. GRB 081001: Further observations from OSN
  64. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  65. GRB 081003A: Swift-XRT Team position and analysis
  66. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  67. GRB 080928: Fermi GBM detection
  68. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  69. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  70. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  71. GRB 081001: Observations from OSN
  72. GRB 080925: Suzaku WAM observation of the prompt emission
  73. GRB 081001: Swift UVOT Observations
  74. GRB 081001: Swift-XRT position
  75. GRB081001: optical limit from ASH-Centurion
  76. GRB080928: redshift retraction
  77. GRB 080928: Watcher observations
  78. GRB 080928: VLT redshift
  79. GRB080928: Gemini-South Absorption Redshift
  80. GRB 080928: Swift-XRT refined analysis
  81. GRB 080928: Swift/UVOT observations
  82. GRB 080928, Swift-BAT final refined analysis
  83. GRB 080928: GROND DETECTION
  84. GRB 080928, Swift-BAT initial refined analysis
  85. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  86. GRB080922, optical upper limit
  87. Swift-BAT trigger 325707 is not a GRB
  88. Swift trigger 325707: Swift/UVOT Upper Limits
  89. Swift trigger 325707: Swift-XRT upper limit
  90. GRB080916A: Suzaku WAM observation of the prompt emission
  91. GRB 080922: Swift/UVOT Upper Limits
  92. GRB080922: Swift-XRT upper limit
  93. GRB 080916C: Fermi GBM Spectral Analysis
  94. GRB 080919: Swift/UVOT Refined Analysis
  95. GRB 080919: Swift-XRT refined analysis
  96. GRB 080919, Swift-BAT refined analysis
  97. GRB 080916C: IRSF/SIRUS NIR Observation
  98. GRB 080916C: GROND Confirmation of the Optical Afterglow
  99. GRB 080916C: GROND Confirmation of the Optical Afterglow
  100. GRB 080919: REM NIR observations

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