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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19593 results found.

  1. GRB 240205B: Swift-BAT refined analysis
  2. Konus-Wind detection of GRB 240205B (long / very soft)
  3. GRB 240205B: VLT/X-shooter redshift
  4. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  5. GRB 240205B: BOOTES-6 optical afterglow follow-up
  6. GRB 240205B: ATCA detection of radio counterpart
  7. GRB 240205B: REM detection of the optical/NIR afterglow
  8. GRB 240205B: Fermi GBM Observation
  9. GRB 240204A: AstroSat CZTI detection
  10. GRB 240205B: GECAM detection of a long burst
  11. GRB 240204A: Swift-BAT refined analysis
  12. GRB 240205B: Skynet Optical Afterglow Observations
  13. GRB 240205B: BOOTES-7 optical afterglow follow-up
  14. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  15. GRB 240205B: Swift detection of a burst
  16. Swift GRB240205.93: Global MASTER-Net observations report
  17. GRB 240204A: Fermi GBM Observation
  18. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  19. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  20. GRB 240204A: Montarrenti Observatory optical observations
  21. GRB 240204A: Enhanced Swift-XRT position
  22. GRB 240204A: Mondy optical afterglow candidate
  23. GRB 240204A: Swift detection of a burst
  24. Swift Trigger 1212791 is not an astrophysical event.
  25. Swift-BAT triggers 1212787, 1212789 are not astrophysical.
  26. IPN triangulation of GRB 240124B
  27. GRB 240129A: Fermi GBM Observation
  28. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  29. IPN triangulation of GRB 240125A (short)
  30. GRB 240128A: Swift-XRT observations
  31. GRB 240128A: Tiled Swift observations
  32. GRB 240122A: ATCA detection of radio counterpart
  33. Swift Trigger 1211211 and 1211212 are not astrophysical
  34. GRB 240123C: AstroSat CZTI detection
  35. GRB240122A: PRIME near infrared detection
  36. GRB 240123B: Fermi GBM Observation
  37. GRB 240123A: Glowbug gamma-ray detection
  38. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  39. GRB 240123A: GRBAlpha detection
  40. IPN triangulation of GRB 240123C (short)
  41. Swift trigger 1210856 is not astrophysical
  42. GRB 240123A: Swift-BAT refined analysis
  43. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  44. GRB 240123A: Enhanced Swift-XRT position
  45. GRB 240122A: Swift/UVOT Upper Limits
  46. GRB 240123A: Swift-XRT refined Analysis
  47. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  48. Fermi GBM Sub-Threshold Detection of GRB 240123A
  49. GRB 240118A: Swift/UVOT Upper Limits
  50. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  51. Swift GRB240123.46: Global MASTER-Net observations report
  52. GRB 240122A: Swift-XRT afterglow detection
  53. GRB 240122A: Tiled Swift observations
  54. IPN triangulation of GRB 240119A (short)
  55. GRB 240118C: GECAM-B detection of a long burst
  56. GRB 240118A: Mondy optical observations
  57. GRB 240118A: Swift-XRT afterglow detection
  58. GRB 240118C: Fermi GBM Observation
  59. GRB 240118C: Swift/BAT-GUANO detection of a burst
  60. GRB 240118A: GRBAlpha detection
  61. GRB 240115A: Fermi GBM Observation
  62. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  63. GRB 240118A: Swift ToO observations
  64. GRB 240118A: AbAO optical upper limit
  65. GRB 240118A: NuSTAR Offline Analysis of the GRB
  66. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  67. GRB 240118A: Fermi-LAT detection
  68. GRID detection of GRB 231230A
  69. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  70. Swift Trigger 1209406 is not an astrophysical event
  71. Swift Triggers 1209401 and 1209403 are not astrophysical events
  72. Swift Triggers 1209371 through 1209374 are not astrophysical events
  73. Swift Triggers 1209369 and 1209370 are not astrophysical events
  74. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  75. GRB 240112C: Glowbug gamma-ray detection
  76. GRB 240112C: VZLUSAT-2 detection
  77. Konus-Wind detection of GRB 240112C
  78. GRB 240112C: GRBAlpha detection
  79. GRB 240112C: Swift/UVOT Detection
  80. GRB 240112C: Fermi GBM Detection
  81. GRB 240112C: Swift-XRT refined Analysis
  82. GRB 240112C: SAO RAS optical observations
  83. Swift GRB 240112C: Global MASTER-Net observations report
  84. GRB 240109A: Swift-BAT refined analysis
  85. GRB 240112C: Swift detection of a burst with an optical counterpart
  86. GRB 240109A: Fermi GBM Observation
  87. GRB 231214A: ATCA Radio Upper Limits
  88. Konus-Wind detection of GRB 240101C
  89. Swift GRB240109.17: Global MASTER-Net observations report
  90. GRB 240109A: Swift detection of a short burst
  91. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  92. IPN triangulation of GRB 240101C (short)
  93. GRB GRB240101C: Fermi GBM observation
  94. GRB 240101A: 1.3m DFOT optical observations
  95. GRB 240102A: 1.3m DFOT optical upper limit
  96. GRB 240101B: 1.3m DFOT optical upper limit
  97. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  98. GRB 231220A: Swift-UVOT upper limit
  99. GRB 240102A: Swift-BAT refined analysis
  100. GRB 240102A: Swift/UVOT Upper Limits

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