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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"

24581 results found.

  1. GRB 230423A(trigger #1165354): Swift-BAT refined analysis
  2. GRB 230427A: AKO Upper Limit
  3. Swift GRB230427.44: Global MASTER-Net observations report
  4. GRB 230426A: MASTER OT J023135.16-792104.8 optical counterpart discovery
  5. GRB 230427A: MITSuME Akeno optical upper limits
  6. GRB 230426A: Fermi GBM Detection
  7. GRB 230427A: Swift detection of a burst with an optical counterpart
  8. Fermi trigger No 704233744: Global MASTER-Net observations report
  9. GRB 230426A: Fermi GBM Final Real-time Localization
  10. GRB 230425A: Fermi GBM Final Real-time Localization
  11. Swift Trigger 1165354 is probably not a GRB
  12. GRB 221009A: Late-time JWST Observations and Detection of Supernova Emission
  13. GRB 230421A: Fermi GBM observation
  14. Konus-Wind detection of GRB 230418A
  15. GRB 230421: Swift/BAT-GUANO arcminute localization
  16. GRB230420A: VLT optical observation
  17. GRB 230420A: Swift-BAT refined analysis
  18. GRB 230421A: Fermi GBM Final Real-time Localization
  19. GRB 230420A: MITSuME Akeno optical observation
  20. GRB 230420A: LCOGT Optical Upper Limit
  21. IPN triangulation of GRB 230418A (short)
  22. GRB 230420A: Swift detection of a burst
  23. GRB 230402A: Fermi GBM detection
  24. GRB 230419A: Fermi GBM Final Real-time Localization
  25. GRB 230418A: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 230418A: Fermi GBM Observation
  27. IceCube-Cascade 230417A: Upper limits from a search for additional neutrino events in IceCube
  28. GRB 230402A: Fermi-LAT detection
  29. Fermi-LAT gamma-ray observations of IceCube-230416A
  30. GRB 230414B Swift-BAT refined analysis
  31. GRB 230415A: Fermi GBM detection
  32. IceCube-230416A: Upper limits from a search for additional neutrino events in IceCube
  33. GRB 230415A: Swift/BAT-GUANO detection
  34. GRB 230414B: 3.6m DOT Optical observations, slow decay at early epochs
  35. GRB 230414B: Montarrenti Observatory late time optical afterglow detection
  36. IceCube-230416A: IceCube observation of a high-energy neutrino candidate
  37. Fermi trigger No 703284533: Global MASTER-Net observations report
  38. GRB 230414B: Lulin 40cm-SLT optical limit
  39. GRB 230409B: 3.6m DOT near-infrared detection, afterglow confirmation
  40. GRB 230414B: Swift-XRT refined Analysis
  41. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-230414A
  42. GRB 230414B: 1.3m DFOT Optical observations
  43. Fermi GRB 230414A: Global MASTER-Net observations report
  44. Swift GRB 230414B: Global MASTER-Net observations report
  45. GRB 230414B: Swift detection of a burst
  46. IceCube-230405A: BOOTES-4/MET Optical Upper Limits
  47. GRB 230414A: Fermi GBM Final Real-time Localization
  48. GRB 230328B: redshift lower limit estimating
  49. GRB 230409B: OHP/T193 optical upper limit
  50. GRB 230409D: VZLUSAT-2 detection
  51. GRB 230410A: Fermi GBM Final Real-time Localization
  52. Fermi GRB 230409C: Global MASTER-Net observations report
  53. Fermi GRB 230409A: Global MASTER-Net observations report
  54. GRB 230409C: Fermi GBM Final Real-time Localization
  55. GRB 230409B: Swift-BAT refined analysis
  56. Fermi trigger No 702745263: Global MASTER-Net observations report
  57. Swift GRB 230409B: Global MASTER-Net observations report
  58. MAXI GRB230408.82: Global MASTER-Net observations report
  59. GRB 230409B: Swift detection of a burst
  60. GRB 230409A: Fermi GBM Final Real-time Localization
  61. GRB 230405B: VZLUSAT-2 detection
  62. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  63. Fermi-LAT gamma-ray observations of IceCube-230405A
  64. Konus-Wind detection of GRB 230405B
  65. GRB 230405B: Fermi GBM Observation
  66. IceCube Alert 230405.56: Global MASTER-Net observations report
  67. GRB 230307A: JWST NIRSpec observations, possible higher redshift
  68. GRB 230307A: further analysis of the Konus-Wind detection and rest-frame energetics
  69. Swift GRB 230405B: Global MASTER-Net observations report
  70. GRB 230405B: Swift detection of a burst
  71. GRB 230405B: Fermi GBM Final Real-time Localization
  72. Fermi GRB 230405A: Global MASTER-Net observations report
  73. IceCube-230405A: IceCube observation of a high-energy neutrino candidate
  74. GRB 230405A: Fermi GBM Final Real-time Localization
  75. GRB 230404A: Fermi GBM Final Real-time Localization
  76. GRB 230402A: CALET Gamma-Ray Burst Monitor detection
  77. Fermi-LAT gamma-ray observations of IceCube-230401A and detection of Fermi J0030.2+0005
  78. IceCube-230401A: Upper limits from a search for additional neutrino events in IceCube
  79. GRB 230307A: Chandra late-time detection of the X-ray afterglow
  80. Fermi GRB 230402A: Global MASTER-Net observations report
  81. GRB 230402A: Fermi GBM Final Real-time Localization
  82. IceCube-230401A: IceCube observation of a high-energy neutrino candidate
  83. GRB 230307A: Bad Time Intervals for Fermi GBM data
  84. GRB 230328B : GRANDMA/Kilonova-Catcher optical detection
  85. IceCube-Cascade 230329A: Upper limits from a search for additional neutrino events in IceCube
  86. GRB 230328B: 3.6m DOT multiband optical observation
  87. Fermi trigger No 701883729: Global MASTER-Net observations report
  88. GRB 230330B: Fermi GBM Final Localization
  89. Konus-Wind detection of GRB 230328B
  90. GRB 230328B: GRBAlpha detection
  91. GRB 230330A: Fermi GBM Final Real-time Localization
  92. GRB 230328B: Swift-BAT refined analysis
  93. GRB 230328B NUTTelA-TAO / BSTI Early Measurements
  94. GRB 230328B: OHP/T120 optical observations
  95. GRB 230328B: OASDG optical observations
  96. GRB 230328B: Swift-XRT refined Analysis
  97. GRB 230328B: Fermi GBM observation
  98. GRB 230328B: Fermi GBM Final Real-time Localization
  99. Fermi GRB 230328A: Global MASTER-Net observations report
  100. GRB 230328A: Fermi GBM Final Real-time Localization

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