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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"

11552 results found.

  1. GRB 230510B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 230510A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 230510A: Nanshan/NEXT optical afterglow detection
  4. GRB 230510B: MAXI/GSC detection
  5. GRB 230510B: Fermi GBM Final Real-time Localization
  6. GRB 230506B: Fermi GBM detection
  7. GRB 230506C: Fermi GBM detection
  8. Fermi trigger No 705413051: Global MASTER-Net observations report
  9. Fermi Gamma-ray Burst Monitor trigger 230510133/705381054 is not a GRB
  10. GRB 230510A: Fermi GBM Final Real-time Localization
  11. GRB 230307A: JWST second-epoch observations
  12. Fermi-LAT gamma-ray observations of IceCube-230506A
  13. IceCube-230506A: IceCube observation of a high-energy neutrino candidate
  14. GRB 230506A: Fermi GBM Final Real-time Localization
  15. Fermi trigger No 704837952: Global MASTER-Net observations report
  16. GRB 230503A: Fermi GBM Final Real-time Localization
  17. Konus-Wind detection of GRB 230430A
  18. IPN triangulation of GRB 230430A (short)
  19. GRB 230430B: Fermi GBM Final Localization
  20. GRB 230430A: Fermi GBM observation
  21. GRB 230430A: AstroSat CZTI detection
  22. GRB 230430A: Fermi GBM Final Real-time Localization
  23. GRB 230426A: VZLUSAT-2 detection
  24. Fermi trigger No 704365743: Global MASTER-Net observations report
  25. GRB 230428A: Fermi GBM Final Real-time Localization
  26. GRB 230426A: MASTER OT J023135.16-792104.8 optical counterpart discovery
  27. GRB 230426A: Fermi GBM Detection
  28. GRB 230426A: AstroSat CZTI detection
  29. Fermi trigger No 704233744: Global MASTER-Net observations report
  30. GRB 230426A: Fermi GBM Final Real-time Localization
  31. GRB 230425A: Fermi GBM Final Real-time Localization
  32. GRB 230421A: Fermi GBM observation
  33. Konus-Wind detection of GRB 230418A
  34. GRB 230421: Swift/BAT-GUANO arcminute localization
  35. Duplicate of GCN 33668
  36. GRB 230421A: Fermi GBM Final Real-time Localization
  37. IPN triangulation of GRB 230418A (short)
  38. GRB 230418A: AstroSat CZTI detection
  39. GRB 230418A: AGILE detection
  40. GRB 230402A: Fermi GBM detection
  41. GRB 230419A: Fermi GBM Final Real-time Localization
  42. GRB 230418A: Swift/BAT-GUANO detection outside the coded FOV
  43. GRB 230418A: Fermi GBM Observation
  44. GRB 230402A: Fermi-LAT detection
  45. Fermi-LAT gamma-ray observations of IceCube-230416A
  46. GRB 230415A: Fermi GBM detection
  47. GRB 230415A: Swift/BAT-GUANO detection
  48. GRB 230307A: iTelescope optical upper limit (likely)
  49. IceCube-230416A: IceCube observation of a high-energy neutrino candidate
  50. Fermi trigger No 703284533: Global MASTER-Net observations report
  51. Fermi GRB 230414A: Global MASTER-Net observations report
  52. GRB 230414A: Fermi GBM Final Real-time Localization
  53. GRB 230328B: redshift lower limit estimating
  54. GRB 230409D: VZLUSAT-2 detection
  55. GRB 230410A: Fermi GBM Final Real-time Localization
  56. Fermi GRB 230409C: Global MASTER-Net observations report
  57. Fermi GRB 230409A: Global MASTER-Net observations report
  58. GRB 230409C: Fermi GBM Final Real-time Localization
  59. Fermi trigger No 702745263: Global MASTER-Net observations report
  60. GRB 230409A: Fermi GBM Final Real-time Localization
  61. GRB 230405B: VZLUSAT-2 detection
  62. Fermi-LAT gamma-ray observations of IceCube-230405A
  63. Konus-Wind detection of GRB 230405B
  64. GRB 230405B: AGILE detection
  65. GRB 230405B: Fermi GBM Observation
  66. GRB 230307A: JWST NIRSpec observations, possible higher redshift
  67. GRB 230307A: short mininum variability timescale compatible with a merger origin
  68. GRB 230405B: AstroSat CZTI detection
  69. GRB 230405B: Fermi GBM Final Real-time Localization
  70. GRB 230307A: JWST observations consistent with the presence of a kilonova
  71. Fermi GRB 230405A: Global MASTER-Net observations report
  72. IceCube-230405A: IceCube observation of a high-energy neutrino candidate
  73. GRB 230405A: Fermi GBM Final Real-time Localization
  74. GRB 230404A: AstroSat CZTI detection
  75. GRB 230404A: Fermi GBM Final Real-time Localization
  76. GRB 230402A: CALET Gamma-Ray Burst Monitor detection
  77. GRB 230402A: AstroSat CZTI detection
  78. Fermi-LAT gamma-ray observations of IceCube-230401A and detection of Fermi J0030.2+0005
  79. GRB 230307A: Chandra late-time detection of the X-ray afterglow
  80. GRB 230402A: AGILE detection
  81. Fermi GRB 230402A: Global MASTER-Net observations report
  82. GRB 230402A: Fermi GBM Final Real-time Localization
  83. IceCube-230401A: IceCube observation of a high-energy neutrino candidate
  84. GRB 230307A: Bad Time Intervals for Fermi GBM data
  85. GRB 230328B : GRANDMA/Kilonova-Catcher optical detection
  86. GRB 230328B: CAHA 2.2m/CAFOS detection
  87. GRB 230328B: 3.6m DOT multiband optical observation
  88. Fermi trigger No 701883729: Global MASTER-Net observations report
  89. GRB 230330B: Fermi GBM Final Localization
  90. Konus-Wind detection of GRB 230328B
  91. GRB 230328B: GRBAlpha detection
  92. GRB 230330A: Fermi GBM Final Real-time Localization
  93. GRB 230328B: Liverpool Telescope afterglow detection
  94. GRB 230328B: AstroSat CZTI detection
  95. GRB 230328B: Fermi GBM observation
  96. GRB 230328B: Fermi GBM Final Real-time Localization
  97. Fermi GRB 230328A: Global MASTER-Net observations report
  98. GRB 230328A: Fermi GBM Final Real-time Localization
  99. GRB 230320B: Fermi GBM Observation
  100. Fermi trigger No 701313046: Global MASTER-Net observations report

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