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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"

19953 results found.

  1. GRB 240222A: Swift-BAT refined analysis
  2. GRB 240222A: Swift-XRT refined Analysis
  3. Swift-BAT triggers 1216907-1216911 are not astrophysical
  4. GRB 240222A: Fermi GBM Observation
  5. GRB 240222A: Swift/UVOT Upper Limits
  6. Swift GRB 240222A: Global MASTER-Net observations report
  7. Swift Trigger 1216864 is not an astrophysical event
  8. GRB 240222A: Swift detection of a burst
  9. Swift-BAT triggers 1216751 and 1216753 are not astrophysical events
  10. Swift-BAT triggers 1216743-1216748 are not astrophysical
  11. Swift GRB240221.92: Global MASTER-Net observations report
  12. GRB 240218A: MeerLICHT upper limits
  13. GRB 240215B: Fermi GBM Observation
  14. GRB 240218A: LBT H-band detection
  15. GRB 240218A: Swift-BAT refined analysis
  16. Konus-Wind detection of GRB 240218A
  17. GRB 240218A: Swift-XRT refined Analysis
  18. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  19. GRB 240218A: Fermi GBM Detection
  20. GRB 240215A: Fermi GBM Observation
  21. GRB 240215B: GRBAlpha detection
  22. IPN triangulation of GRB 240209A
  23. GRB 240218A: Enhanced Swift-XRT position
  24. GRB 240218A: REM detection of a NIR afterglow candidate
  25. GRB 240218A: Swift detection of a burst
  26. Swift GRB240218.08: Global MASTER-Net observations report
  27. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  28. Swift Triggers 12156887-1215690 are not astrophysical events.
  29. GRB 240215A: Tiled Swift observations
  30. GRB 240215A: Swift/BAT-GUANO localization of a burst
  31. GRB 240128A: Further Swift-XRT observations
  32. GRB 240214A: Tiled Swift observations
  33. GRB 240214A/1H 0451-560: MAXI/GSC detection
  34. Konus-Wind detection of GRB 240204A
  35. IPN triangulation of GRB 240205A (short)
  36. GRB 240205B: PRIME near infrared detection
  37. Swift Trigger 1213872 is not an astrophysical event
  38. GRB240204A: Swift/UVOT Upper Limits
  39. GRB 240205B: AstroSat CZTI detection
  40. GRB 240205B: Swift-BAT refined analysis
  41. Konus-Wind detection of GRB 240205B (long / very soft)
  42. GRB 240205B: VLT/X-shooter redshift
  43. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  44. GRB 240205B: BOOTES-6 optical afterglow follow-up
  45. GRB 240205B: ATCA detection of radio counterpart
  46. GRB 240205B: REM detection of the optical/NIR afterglow
  47. GRB 240205B: Fermi GBM Observation
  48. GRB 240204A: AstroSat CZTI detection
  49. GRB 240205B: GECAM detection of a long burst
  50. GRB 240204A: Swift-BAT refined analysis
  51. GRB 240205B: Skynet Optical Afterglow Observations
  52. GRB 240205B: BOOTES-7 optical afterglow follow-up
  53. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  54. GRB 240205B: Swift detection of a burst
  55. Swift GRB240205.93: Global MASTER-Net observations report
  56. GRB 240204A: Fermi GBM Observation
  57. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  58. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  59. GRB 240204A: Montarrenti Observatory optical observations
  60. GRB 240204A: Enhanced Swift-XRT position
  61. GRB 240204A: Mondy optical afterglow candidate
  62. GRB 240204A: Swift detection of a burst
  63. Swift Trigger 1212791 is not an astrophysical event.
  64. Swift-BAT triggers 1212787, 1212789 are not astrophysical.
  65. IPN triangulation of GRB 240124B
  66. GRB 240129A: Fermi GBM Observation
  67. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  68. IPN triangulation of GRB 240125A (short)
  69. GRB 240128A: Swift-XRT observations
  70. GRB 240128A: Tiled Swift observations
  71. GRB 240122A: ATCA detection of radio counterpart
  72. Swift Trigger 1211211 and 1211212 are not astrophysical
  73. GRB 240123C: AstroSat CZTI detection
  74. GRB240122A: PRIME near infrared detection
  75. GRB 240123B: Fermi GBM Observation
  76. GRB 240123A: Glowbug gamma-ray detection
  77. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  78. GRB 240123A: GRBAlpha detection
  79. IPN triangulation of GRB 240123C (short)
  80. Swift trigger 1210856 is not astrophysical
  81. GRB 240123A: Swift-BAT refined analysis
  82. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  83. GRB 240123A: Enhanced Swift-XRT position
  84. GRB 240122A: Swift/UVOT Upper Limits
  85. GRB 240123A: Swift-XRT refined Analysis
  86. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  87. Fermi GBM Sub-Threshold Detection of GRB 240123A
  88. GRB 240118A: Swift/UVOT Upper Limits
  89. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  90. Swift GRB240123.46: Global MASTER-Net observations report
  91. GRB 240122A: Swift-XRT afterglow detection
  92. GRB 240122A: Tiled Swift observations
  93. IPN triangulation of GRB 240119A (short)
  94. GRB 240118C: GECAM-B detection of a long burst
  95. GRB 240118A: Mondy optical observations
  96. GRB 240118A: Swift-XRT afterglow detection
  97. GRB 240118C: Fermi GBM Observation
  98. GRB 240118C: Swift/BAT-GUANO detection of a burst
  99. GRB 240118A: GRBAlpha detection
  100. GRB 240115A: Fermi GBM Observation

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