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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"

21526 results found.

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

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