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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"

39373 results found.

  1. GRB 230427A: BOOTES-5/JGT afterglow detection
  2. GRB 230423A(trigger #1165354): Swift-BAT refined analysis
  3. GRB 230427A: AKO Upper Limit
  4. Swift GRB230427.44: Global MASTER-Net observations report
  5. GRB 230426A: MASTER OT J023135.16-792104.8 optical counterpart discovery
  6. GRB 230427A: MITSuME Akeno optical upper limits
  7. GRB 230426A: Fermi GBM Detection
  8. GRB 230427A: Enhanced Swift-XRT position
  9. GRB 230427A: Swift detection of a burst with an optical counterpart
  10. GRB 230426A: AstroSat CZTI detection
  11. Fermi trigger No 704233744: Global MASTER-Net observations report
  12. GRB 230426A: Fermi GBM Final Real-time Localization
  13. GRB 230423A: Swift/UVOT Upper Limits
  14. GRB 230425A: Fermi GBM Final Real-time Localization
  15. GRB 230423A: Swift-XRT refined Analysis
  16. GRB 230420A: Lowell Discovery Telescope Optical Detection
  17. GRB 230423A: Swift-XRT afterglow detection
  18. Swift Trigger 1165354 is probably not a GRB
  19. GRB 221009A: Late-time JWST Observations and Detection of Supernova Emission
  20. GRB 230421A: Fermi GBM observation
  21. Konus-Wind detection of GRB 230418A
  22. GRB 230420A: Swift/UVOT Upper Limits
  23. GRB 230421: Swift/BAT-GUANO arcminute localization
  24. GRB230420A: VLT optical observation
  25. GRB 230420A: Swift-BAT refined analysis
  26. GRB 230421A: Fermi GBM Final Real-time Localization
  27. GRB 230420A: Swift-XRT refined Analysis
  28. GRB 230420A: MITSuME Akeno optical observation
  29. GRB 230420A: NOT optical afterglow confirmation
  30. GRB 230420A: Gaoyazi/GOT optical upper limit
  31. GRB 230420A: BOOTES-5/JGT optical afterglow detection
  32. GRB 230420A: LCOGT Optical Upper Limit
  33. GRB 230420A: Enhanced Swift-XRT position
  34. IPN triangulation of GRB 230418A (short)
  35. GRB 230420A: Swift detection of a burst
  36. GRB 230418A: AstroSat CZTI detection
  37. GRB 230418A: AGILE detection
  38. GRB 230402A: Fermi GBM detection
  39. GRB 230419A: Fermi GBM Final Real-time Localization
  40. GRB 230418A: Swift/BAT-GUANO detection outside the coded FOV
  41. GRB 230418A: Fermi GBM Observation
  42. GRB 230402A: Fermi-LAT detection
  43. Fermi-LAT gamma-ray observations of IceCube-230416A
  44. GRB 230414B: Nickel and KAIT telescope optical observations
  45. GRB 230414B Swift-BAT refined analysis
  46. GRB 230415A: Fermi GBM detection
  47. GRB 230414B: Swift/UVOT Detection
  48. GRB 230414B: Osservatorio Astronomico Nastro Verde - Sorrento: optical observations
  49. GRB 230415A: Swift/BAT-GUANO detection
  50. GRB 230414B: 3.6m DOT Optical observations, slow decay at early epochs
  51. GRB 230307A: iTelescope optical upper limit (likely)
  52. GRB 230414B: Montarrenti Observatory late time optical afterglow detection
  53. IceCube-230416A: IceCube observation of a high-energy neutrino candidate
  54. Fermi trigger No 703284533: Global MASTER-Net observations report
  55. GRB 230414B: Lulin 40cm-SLT optical limit
  56. GRB 230414B: Bassano Bresciano Observatory optical observations
  57. GRB 230414B: Redshift from OSIRIS/GTC
  58. GRB 230414B: AbAO optical observations
  59. GRB 230409B: 3.6m DOT near-infrared detection, afterglow confirmation
  60. GRB 230414B: Swift-XRT refined Analysis
  61. GRB 230414B: Dabancheng/GHOST optical observations
  62. GRB 230414B: slow optical light curve decay
  63. GRB 230414B: SAO RAS optical observations
  64. GRB 230414B: Enhanced Swift-XRT position
  65. GRB 230414B: 1.3m DFOT Optical observations
  66. Fermi GRB 230414A: Global MASTER-Net observations report
  67. GRB 230414B: GROWTH India Telescope afterglow confirmation
  68. GRB 230414B (correction GRB name in the GCN 33615): Mondy optical afterglow candidate
  69. GRB 230414B: Nanshan/HMT optical afterglow detection
  70. GRB 230414A: Mondy optical afterglow candidate
  71. Swift GRB 230414B: Global MASTER-Net observations report
  72. GRB 230414B: Prompt enhanced Swift-XRT position
  73. GRB 230414B: Swift detection of a burst
  74. IceCube-230405A: BOOTES-4/MET Optical Upper Limits
  75. GRB 230414A: Fermi GBM Final Real-time Localization
  76. GRB 230328B: redshift lower limit estimating
  77. GRB 230409B: Mondy optical upper limit
  78. GRB 230409B: OHP/T193 optical upper limit
  79. GRB 230410B: VZLUSAT-2 detection
  80. GRB 230409D: VZLUSAT-2 detection
  81. GRB 230410B: AGILE detection of a burst
  82. GRB 230410A: Fermi GBM Final Real-time Localization
  83. Fermi GRB 230409C: Global MASTER-Net observations report
  84. Fermi GRB 230409A: Global MASTER-Net observations report
  85. GRB 230409C: Fermi GBM Final Real-time Localization
  86. GRB 230409B: Swift-XRT refined Analysis
  87. GRB 230409B: Swift-BAT refined analysis
  88. Fermi trigger No 702745263: Global MASTER-Net observations report
  89. Swift GRB 230409B: Global MASTER-Net observations report
  90. GRB 230409B: Swift/UVOT Detection
  91. GRB 230409B: Enhanced Swift-XRT position
  92. MAXI GRB230408.82: Global MASTER-Net observations report
  93. GRB 230409B: Swift detection of a burst
  94. GRB 230409A: Fermi GBM Final Real-time Localization
  95. GRB 230405B: VZLUSAT-2 detection
  96. Fermi-LAT gamma-ray observations of IceCube-230405A
  97. Konus-Wind detection of GRB 230405B
  98. GRB 230405B: AGILE detection
  99. GRB 230405B: Swift-XRT refined Analysis
  100. GRB 230405B: Fermi GBM Observation

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