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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"

19668 results found.

  1. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  2. IPN triangulation of GRB 240125A (short)
  3. GRB 240128A: Swift-XRT observations
  4. GRB 240128A: Tiled Swift observations
  5. GRB 240122A: ATCA detection of radio counterpart
  6. Swift Trigger 1211211 and 1211212 are not astrophysical
  7. GRB 240123C: AstroSat CZTI detection
  8. GRB240122A: PRIME near infrared detection
  9. GRB 240123B: Fermi GBM Observation
  10. GRB 240123A: Glowbug gamma-ray detection
  11. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  12. GRB 240123A: GRBAlpha detection
  13. IPN triangulation of GRB 240123C (short)
  14. Swift trigger 1210856 is not astrophysical
  15. GRB 240123A: Swift-BAT refined analysis
  16. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  17. GRB 240123A: Enhanced Swift-XRT position
  18. GRB 240122A: Swift/UVOT Upper Limits
  19. GRB 240123A: Swift-XRT refined Analysis
  20. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  21. Fermi GBM Sub-Threshold Detection of GRB 240123A
  22. GRB 240118A: Swift/UVOT Upper Limits
  23. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  24. Swift GRB240123.46: Global MASTER-Net observations report
  25. GRB 240122A: Swift-XRT afterglow detection
  26. GRB 240122A: Tiled Swift observations
  27. IPN triangulation of GRB 240119A (short)
  28. GRB 240118C: GECAM-B detection of a long burst
  29. GRB 240118A: Mondy optical observations
  30. GRB 240118A: Swift-XRT afterglow detection
  31. GRB 240118C: Fermi GBM Observation
  32. GRB 240118C: Swift/BAT-GUANO detection of a burst
  33. GRB 240118A: GRBAlpha detection
  34. GRB 240115A: Fermi GBM Observation
  35. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  36. GRB 240118A: Swift ToO observations
  37. GRB 240118A: AbAO optical upper limit
  38. GRB 240118A: NuSTAR Offline Analysis of the GRB
  39. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  40. GRB 240118A: Fermi-LAT detection
  41. GRID detection of GRB 231230A
  42. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  43. Swift Trigger 1209406 is not an astrophysical event
  44. Swift Triggers 1209401 and 1209403 are not astrophysical events
  45. Swift Triggers 1209371 through 1209374 are not astrophysical events
  46. Swift Triggers 1209369 and 1209370 are not astrophysical events
  47. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  48. GRB 240112C: Glowbug gamma-ray detection
  49. GRB 240112C: VZLUSAT-2 detection
  50. Konus-Wind detection of GRB 240112C
  51. GRB 240112C: GRBAlpha detection
  52. GRB 240112C: Swift/UVOT Detection
  53. GRB 240112C: Fermi GBM Detection
  54. GRB 240112C: Swift-XRT refined Analysis
  55. GRB 240112C: SAO RAS optical observations
  56. Swift GRB 240112C: Global MASTER-Net observations report
  57. GRB 240109A: Swift-BAT refined analysis
  58. GRB 240112C: Swift detection of a burst with an optical counterpart
  59. GRB 240109A: Fermi GBM Observation
  60. GRB 231214A: ATCA Radio Upper Limits
  61. Konus-Wind detection of GRB 240101C
  62. Swift GRB240109.17: Global MASTER-Net observations report
  63. GRB 240109A: Swift detection of a short burst
  64. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  65. IPN triangulation of GRB 240101C (short)
  66. GRB GRB240101C: Fermi GBM observation
  67. GRB 240101A: 1.3m DFOT optical observations
  68. GRB 240102A: 1.3m DFOT optical upper limit
  69. GRB 240101B: 1.3m DFOT optical upper limit
  70. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  71. GRB 231220A: Swift-UVOT upper limit
  72. GRB 240102A: Swift-BAT refined analysis
  73. GRB 240102A: Swift/UVOT Upper Limits
  74. GRB 231230A: Swift-BAT refined analysis
  75. GRB 240101A: Swift-BAT refined analysis
  76. GRB 240101B: Swift-BAT refined analysis
  77. GRB 240102A: Enhanced Swift-XRT position
  78. GRB 240101B: Swift-XRT refined Analysis
  79. GRB 240102A: Swift-XRT refined Analysis
  80. GRB 240102A: LCOGT Optical Upper Limits
  81. GRB240102A: BOOTES-6/DPRT optical upper limit
  82. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  83. GRB 240102A: Swift detection of a burst
  84. GRB 240101A: Terskol Zeiss-2000 optical observations
  85. GRB 240101B: Swift/UVOT Upper Limits
  86. GRB 240101A: Swift/UVOT Upper Limits
  87. GRB 240101A: Swift-XRT refined Analysis
  88. GRB 240101B: Enhanced Swift-XRT position
  89. GRB 240101B: KAIT Optical Upper Limit
  90. GRB 240101A: KAIT Optical Upper Limit
  91. GRB 240101A: Enhanced Swift-XRT position
  92. Swift GRB240101.85: Global MASTER-Net observations report
  93. GRB 240101B: Swift detection of a burst
  94. GRB 240101A: Swift detection of a burst
  95. GRB231230A: Fermi GBM Observation
  96. GRB 231230A: Swift-XRT refined Analysis
  97. GRB 231230A: GOTO optical upper limits
  98. GRB 231230A: Enhanced Swift-XRT position
  99. GRB 231230A: Swift/UVOT Upper Limits
  100. GRB 231230A: Prompt enhanced Swift-XRT position

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