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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"

32688 results found.

  1. Swift UVOT observations of GRB 081024
  2. GRB 081024: Swift-XRT refined analysis
  3. GRB 081024, Swift-BAT refined analysis
  4. GRB 081024: Faulkes Telescope North optical observations
  5. GRB 081024: KAIT Optical Limits
  6. GRB 081024: Early Super-LOTIS Observations
  7. GRB 081024A: ROTSE-III Optical Limits
  8. GRB 081022, Swift-BAT refined analysis
  9. GRB 081016A: Swift-XRT refined analysis
  10. GRB 081012: Swift-XRT Refined Analysis
  11. Swift trigger 332287 is not a GRB
  12. GRB 081017, Swift-BAT refined analysis
  13. GRB 081017: REM early observations
  14. GRB 081016B, Swift-BAT refined analysis
  15. GRB 081016B: Swift/UVOT Upper Limits
  16. GRB 081011: Swift XRT refined analysis
  17. GRB 081016B: Swift-XRT Team refined Analysis
  18. GRB 081016B: ROTSE-III Optical Limits
  19. GRB 081016: Swift-XRT candidate afterglow detection
  20. Detection of flare star Algol in Swift-BAT slew data
  21. GRB 081012: GROND upper limits
  22. GRB 081008: Galaxy associated with z=1.967 absorber
  23. GRB 081012: Fermi GBM detection
  24. GRB 081007 and GRB 081007B: Fermi GBM detection
  25. GRB 080430: optical observations
  26. GRB 081008 optical upper limit
  27. GRB 081012: Observations from NOT
  28. GRB 081012: Swift/UVOT analysis of initial observations
  29. GRB 081012: Swift/XRT detection
  30. GRB 081012, Swift-BAT refined analysis
  31. GRB 081012: ROTSE-III Optical Limits
  32. Revised table for GRB 081011 UVOT detections
  33. GRB081011: UVOT detection of an optical afterglow
  34. GRB 081011: Swift/XRT detection
  35. GRB 081011, Swift-BAT refined analysis
  36. GRB 081008, SMARTS optical/IR afterglow observations
  37. GRB 081007: Radio Detection
  38. Konus-Wind observation of GRB 081001
  39. GRB 081007: Rapid PROMPT Detections
  40. GRB 081008, Swift-BAT refined analysis
  41. GRB 081008: VLT redshift confirmation
  42. GRB 081008: Swift-XRT Refined Analysis
  43. GRB081008: Swift/UVOT observations
  44. GRB 081008: Gemini-South Absorption Redshiftt
  45. GRB 081008: VLT/FORS2 spectroscopy
  46. GRB 081008: ROTSE-III Detection of Optical Counterpart
  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, Faulkes Telescope North optical observations
  54. GRB 081007, SMARTS optical/IR afterglow observations
  55. GRB 081007: REM NIR and optical counterpart
  56. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  57. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  58. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  59. GRB 081003B: Swift-XRT upper limit
  60. GRB 081003A: OSN optical observations
  61. GRB 081001: Further observations from OSN
  62. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  63. GRB 081003A: Swift-XRT Team position and analysis
  64. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  65. GRB 080928: Fermi GBM detection
  66. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  67. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  68. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  69. GRB 081001: Observations from OSN
  70. GRB 080925: Suzaku WAM observation of the prompt emission
  71. GRB 081001: Swift UVOT Observations
  72. GRB 081001: Swift-XRT position
  73. GRB081001: optical limit from ASH-Centurion
  74. GRB080928: redshift retraction
  75. GRB 080928: Watcher observations
  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, Swift-BAT initial refined analysis
  83. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  84. GRB080922, optical upper limit
  85. Swift-BAT trigger 325707 is not a GRB
  86. Swift trigger 325707: Swift/UVOT Upper Limits
  87. Swift trigger 325707: Swift-XRT upper limit
  88. GRB080916A: Suzaku WAM observation of the prompt emission
  89. GRB 080922: Swift/UVOT Upper Limits
  90. GRB080922: Swift-XRT upper limit
  91. GRB 080916C: Fermi GBM Spectral Analysis
  92. GRB 080919: Swift/UVOT Refined Analysis
  93. GRB 080919: Swift-XRT refined analysis
  94. GRB 080919, Swift-BAT refined analysis
  95. GRB 080916C: IRSF/SIRUS NIR Observation
  96. GRB 080916C: GROND Confirmation of the Optical Afterglow
  97. GRB 080916C: GROND Confirmation of the Optical Afterglow
  98. GRB 080919: REM NIR observations
  99. GRB 080915A: GROND upper limits
  100. GRB080913: Swift-BAT spectral lag

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