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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"

21525 results found.

  1. GRB 240204A: Fermi GBM Observation
  2. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  3. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  4. GRB 240204A: Montarrenti Observatory optical observations
  5. GRB 240204A: Enhanced Swift-XRT position
  6. GRB 240204A: Mondy optical afterglow candidate
  7. GRB 240204A: Swift detection of a burst
  8. Swift Trigger 1212791 is not an astrophysical event.
  9. Swift-BAT triggers 1212787, 1212789 are not astrophysical.
  10. IPN triangulation of GRB 240124B
  11. GRB 240129A: Fermi GBM Observation
  12. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  13. IPN triangulation of GRB 240125A (short)
  14. GRB 240128A: Swift-XRT observations
  15. GRB 240128A: Tiled Swift observations
  16. GRB 240122A: ATCA detection of radio counterpart
  17. Swift Trigger 1211211 and 1211212 are not astrophysical
  18. GRB 240123C: AstroSat CZTI detection
  19. GRB240122A: PRIME near infrared detection
  20. GRB 240123B: Fermi GBM Observation
  21. GRB 240123A: Glowbug gamma-ray detection
  22. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  23. GRB 240123A: GRBAlpha detection
  24. IPN triangulation of GRB 240123C (short)
  25. Swift trigger 1210856 is not astrophysical
  26. GRB 240123A: Swift-BAT refined analysis
  27. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  28. GRB 240123A: Enhanced Swift-XRT position
  29. GRB 240122A: Swift/UVOT Upper Limits
  30. GRB 240123A: Swift-XRT refined Analysis
  31. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  32. Fermi GBM Sub-Threshold Detection of GRB 240123A
  33. GRB 240118A: Swift/UVOT Upper Limits
  34. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  35. Swift GRB240123.46: Global MASTER-Net observations report
  36. GRB 240122A: Swift-XRT afterglow detection
  37. GRB 240122A: Tiled Swift observations
  38. IPN triangulation of GRB 240119A (short)
  39. GRB 240118C: GECAM-B detection of a long burst
  40. GRB 240118A: Mondy optical observations
  41. GRB 240118A: Swift-XRT afterglow detection
  42. GRB 240118C: Fermi GBM Observation
  43. GRB 240118C: Swift/BAT-GUANO detection of a burst
  44. GRB 240118A: GRBAlpha detection
  45. GRB 240115A: Fermi GBM Observation
  46. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  47. GRB 240118A: Swift ToO observations
  48. GRB 240118A: AbAO optical upper limit
  49. GRB 240118A: NuSTAR Offline Analysis of the GRB
  50. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  51. GRB 240118A: Fermi-LAT detection
  52. GRID detection of GRB 231230A
  53. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  54. Swift Trigger 1209406 is not an astrophysical event
  55. Swift Triggers 1209401 and 1209403 are not astrophysical events
  56. Swift Triggers 1209371 through 1209374 are not astrophysical events
  57. Swift Triggers 1209369 and 1209370 are not astrophysical events
  58. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  59. GRB 240112C: Glowbug gamma-ray detection
  60. GRB 240112C: VZLUSAT-2 detection
  61. Konus-Wind detection of GRB 240112C
  62. GRB 240112C: GRBAlpha detection
  63. GRB 240112C: Swift/UVOT Detection
  64. GRB 240112C: Fermi GBM Detection
  65. GRB 240112C: Swift-XRT refined Analysis
  66. GRB 240112C: SAO RAS optical observations
  67. Swift GRB 240112C: Global MASTER-Net observations report
  68. GRB 240109A: Swift-BAT refined analysis
  69. GRB 240112C: Swift detection of a burst with an optical counterpart
  70. GRB 240109A: Fermi GBM Observation
  71. GRB 231214A: ATCA Radio Upper Limits
  72. Konus-Wind detection of GRB 240101C
  73. Swift GRB240109.17: Global MASTER-Net observations report
  74. GRB 240109A: Swift detection of a short burst
  75. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  76. IPN triangulation of GRB 240101C (short)
  77. GRB GRB240101C: Fermi GBM observation
  78. GRB 240101A: 1.3m DFOT optical observations
  79. GRB 240102A: 1.3m DFOT optical upper limit
  80. GRB 240101B: 1.3m DFOT optical upper limit
  81. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  82. GRB 231220A: Swift-UVOT upper limit
  83. GRB 240102A: Swift-BAT refined analysis
  84. GRB 240102A: Swift/UVOT Upper Limits
  85. GRB 231230A: Swift-BAT refined analysis
  86. GRB 240101A: Swift-BAT refined analysis
  87. GRB 240101B: Swift-BAT refined analysis
  88. GRB 240102A: Enhanced Swift-XRT position
  89. GRB 240101B: Swift-XRT refined Analysis
  90. GRB 240102A: Swift-XRT refined Analysis
  91. GRB 240102A: LCOGT Optical Upper Limits
  92. GRB240102A: BOOTES-6/DPRT optical upper limit
  93. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  94. GRB 240102A: Swift detection of a burst
  95. GRB 240101A: Terskol Zeiss-2000 optical observations
  96. GRB 240101B: Swift/UVOT Upper Limits
  97. GRB 240101A: Swift/UVOT Upper Limits
  98. GRB 240101A: Swift-XRT refined Analysis
  99. GRB 240101B: Enhanced Swift-XRT position
  100. GRB 240101B: KAIT Optical Upper Limit

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