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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"

19598 results found.

  1. IPN triangulation of GRB 240205A (short)
  2. GRB 240205B: PRIME near infrared detection
  3. Swift Trigger 1213872 is not an astrophysical event
  4. GRB240204A: Swift/UVOT Upper Limits
  5. GRB 240205B: AstroSat CZTI detection
  6. GRB 240205B: Swift-BAT refined analysis
  7. Konus-Wind detection of GRB 240205B (long / very soft)
  8. GRB 240205B: VLT/X-shooter redshift
  9. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  10. GRB 240205B: BOOTES-6 optical afterglow follow-up
  11. GRB 240205B: ATCA detection of radio counterpart
  12. GRB 240205B: REM detection of the optical/NIR afterglow
  13. GRB 240205B: Fermi GBM Observation
  14. GRB 240204A: AstroSat CZTI detection
  15. GRB 240205B: GECAM detection of a long burst
  16. GRB 240204A: Swift-BAT refined analysis
  17. GRB 240205B: Skynet Optical Afterglow Observations
  18. GRB 240205B: BOOTES-7 optical afterglow follow-up
  19. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  20. GRB 240205B: Swift detection of a burst
  21. Swift GRB240205.93: Global MASTER-Net observations report
  22. GRB 240204A: Fermi GBM Observation
  23. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  24. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  25. GRB 240204A: Montarrenti Observatory optical observations
  26. GRB 240204A: Enhanced Swift-XRT position
  27. GRB 240204A: Mondy optical afterglow candidate
  28. GRB 240204A: Swift detection of a burst
  29. Swift Trigger 1212791 is not an astrophysical event.
  30. Swift-BAT triggers 1212787, 1212789 are not astrophysical.
  31. IPN triangulation of GRB 240124B
  32. GRB 240129A: Fermi GBM Observation
  33. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  34. IPN triangulation of GRB 240125A (short)
  35. GRB 240128A: Swift-XRT observations
  36. GRB 240128A: Tiled Swift observations
  37. GRB 240122A: ATCA detection of radio counterpart
  38. Swift Trigger 1211211 and 1211212 are not astrophysical
  39. GRB 240123C: AstroSat CZTI detection
  40. GRB240122A: PRIME near infrared detection
  41. GRB 240123B: Fermi GBM Observation
  42. GRB 240123A: Glowbug gamma-ray detection
  43. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  44. GRB 240123A: GRBAlpha detection
  45. IPN triangulation of GRB 240123C (short)
  46. Swift trigger 1210856 is not astrophysical
  47. GRB 240123A: Swift-BAT refined analysis
  48. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  49. GRB 240123A: Enhanced Swift-XRT position
  50. GRB 240122A: Swift/UVOT Upper Limits
  51. GRB 240123A: Swift-XRT refined Analysis
  52. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  53. Fermi GBM Sub-Threshold Detection of GRB 240123A
  54. GRB 240118A: Swift/UVOT Upper Limits
  55. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  56. Swift GRB240123.46: Global MASTER-Net observations report
  57. GRB 240122A: Swift-XRT afterglow detection
  58. GRB 240122A: Tiled Swift observations
  59. IPN triangulation of GRB 240119A (short)
  60. GRB 240118C: GECAM-B detection of a long burst
  61. GRB 240118A: Mondy optical observations
  62. GRB 240118A: Swift-XRT afterglow detection
  63. GRB 240118C: Fermi GBM Observation
  64. GRB 240118C: Swift/BAT-GUANO detection of a burst
  65. GRB 240118A: GRBAlpha detection
  66. GRB 240115A: Fermi GBM Observation
  67. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  68. GRB 240118A: Swift ToO observations
  69. GRB 240118A: AbAO optical upper limit
  70. GRB 240118A: NuSTAR Offline Analysis of the GRB
  71. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  72. GRB 240118A: Fermi-LAT detection
  73. GRID detection of GRB 231230A
  74. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  75. Swift Trigger 1209406 is not an astrophysical event
  76. Swift Triggers 1209401 and 1209403 are not astrophysical events
  77. Swift Triggers 1209371 through 1209374 are not astrophysical events
  78. Swift Triggers 1209369 and 1209370 are not astrophysical events
  79. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  80. GRB 240112C: Glowbug gamma-ray detection
  81. GRB 240112C: VZLUSAT-2 detection
  82. Konus-Wind detection of GRB 240112C
  83. GRB 240112C: GRBAlpha detection
  84. GRB 240112C: Swift/UVOT Detection
  85. GRB 240112C: Fermi GBM Detection
  86. GRB 240112C: Swift-XRT refined Analysis
  87. GRB 240112C: SAO RAS optical observations
  88. Swift GRB 240112C: Global MASTER-Net observations report
  89. GRB 240109A: Swift-BAT refined analysis
  90. GRB 240112C: Swift detection of a burst with an optical counterpart
  91. GRB 240109A: Fermi GBM Observation
  92. GRB 231214A: ATCA Radio Upper Limits
  93. Konus-Wind detection of GRB 240101C
  94. Swift GRB240109.17: Global MASTER-Net observations report
  95. GRB 240109A: Swift detection of a short burst
  96. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  97. IPN triangulation of GRB 240101C (short)
  98. GRB GRB240101C: Fermi GBM observation
  99. GRB 240101A: 1.3m DFOT optical observations
  100. GRB 240102A: 1.3m DFOT optical upper limit

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