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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"

37708 results found.

  1. GRB 240405A: Glowbug gamma-ray detection
  2. GRB 240411B: Enhanced Swift-XRT position
  3. GRB 240411B: LCO optical afterglow detection
  4. GRB 240411B: Swift detection of a burst
  5. GRB 240408B: GRBAlpha detection
  6. GRB 240411A: Fermi GBM Final Real-time Localization
  7. EP240408a: Upper limits from GECAM-B Observation
  8. GRB 240405A: GRBAlpha detection
  9. GRB 240408B: AstroSat CZTI detection
  10. Fermi GRB 240408A: Global MASTER-Net observations report
  11. GRB 240408A: Fermi GBM Final Real-time Localization
  12. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  13. GRB 240402C: CALET Gamma-Ray Burst Monitor detection
  14. Fermi GRB 240407A: Global MASTER-Net observations report
  15. GRB 240407A: Fermi GBM Final Real-time Localization
  16. Fermi-LAT gamma-ray observations of IceCube-240327B
  17. Fermi-LAT gamma-ray observations of IceCube-240327A
  18. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  19. Fermi GRB 240405B: Global MASTER-Net observations report
  20. GRB 240405B: Fermi GBM Final Real-time Localization
  21. GRB 240402C: Glowbug gamma-ray detection
  22. GRB 240405A: Fermi GBM Final Real-time Localization
  23. GRB 240402C: GRBAlpha detection
  24. GRB 240331A: GRBAlpha detection
  25. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  26. GRB 240403B: Glowbug gamma-ray detection
  27. GRB 240403A: Glowbug gamma-ray detection
  28. LXT 240402A/GRB 240402B: Glowbug gamma-ray detection
  29. Konus-Wind detection of LXT 240402A/GRB 240402B
  30. GRB/FXT 240402B: Kinder optical counterpart candidate
  31. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  32. GRB 240403A: Fermi GBM Detection
  33. LXT 240402A: EP-FXT detection of the X-ray afterglow
  34. Fermi GRB 240404A: Global MASTER-Net observations report
  35. GRB 240404A: Fermi GBM Final Real-time Localization
  36. GRB 240402B: GWAC-F50A optical upper limit
  37. GRB 240402B: GECAM-C detection
  38. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  39. Fermi trigger No 733808041: Global MASTER-Net observations report
  40. Fermi GRB 240402A: Global MASTER-Net observations report
  41. GRB 240402A: Fermi GBM Final Real-time Localization
  42. IBAS Alert n.10651 not a GRB
  43. GRB 240329A: Glowbug gamma-ray detection
  44. GRB 240324A: AstroSat CZTI detection of a short burst
  45. GRB 240331A: AstroSat CZTI detection
  46. GRB 240329A: AstroSat CZTI detection
  47. GRB 240331A: Fermi GBM Final Real-time Localization
  48. GRB 240329A: GRBAlpha detection
  49. Fermi trigger No 733366352: Global MASTER-Net observations report
  50. Fermi GRB 240329A: Global MASTER-Net observations report
  51. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  52. GRB 240329A: Fermi GBM Final Real-time Localization
  53. Fermi GRB 240328B: Global MASTER-Net observations report
  54. Fermi GRB 240328A: Global MASTER-Net observations report
  55. GRB 240328C: Glowbug gamma-ray detection
  56. GRB 240328B: Fermi GBM Final Real-time Localization
  57. GRB 240328A: Fermi GBM Final Real-time Localization
  58. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  59. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  60. X-ray transient EP 240315a: Second epoch Chandra observations
  61. Fermi trigger No 733097506: Global MASTER-Net observations report
  62. Fermi trigger No 733092476: Global MASTER-Net observations report
  63. GRB 240320A: Glowbug gamma-ray detection
  64. Fermi trigger No 732937833: Global MASTER-Net observations report
  65. GRB 240318A: Fermi GBM Observation
  66. Fermi GRB 240320A: Global MASTER-Net observations report
  67. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  68. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  69. Fermi trigger No 732657380: Global MASTER-Net observations report
  70. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  71. GRB 240320A: Fermi GBM Final Real-time Localization
  72. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  73. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  74. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  75. GRB 240318A: Glowbug gamma-ray detection
  76. GRB 240317C: Glowbug gamma-ray detection
  77. GRB 240318B: Glowbug gamma-ray detection
  78. GRB 240317B: Fermi GBM Observation
  79. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  80. Fermi GRB 240318A: Global MASTER-Net observations report
  81. GRB 240318A: Fermi GBM Final Real-time Localization
  82. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  83. GRB 240317A: AstroSat CZTI detection
  84. GRB 240315B: AstroSat CZTI detection
  85. X-ray transient EP240315a: Kitab observatory optical upper limitns
  86. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  87. Fermi GRB 240317B: Global MASTER-Net observations report
  88. Fermi GRB 240317A: Global MASTER-Net observations report
  89. GRB 240317B: Fermi GBM Final Real-time Localization
  90. GRB 240317A: Fermi GBM Final Real-time Localization
  91. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  92. Fermi trigger No 732299243: Global MASTER-Net observations report
  93. GRID detection of GRB 240306A
  94. Changes to the Fermi-GBM Triggering Thresholds
  95. GRB 240315A: Fermi GBM Final Real-time Localization
  96. Fermi GRB 240314A: Global MASTER-Net observations report
  97. GRB 240314A: Fermi GBM Final Real-time Localization
  98. GRB 240312A: Glowbug gamma-ray detection
  99. Swift Trigger 1219905 is not a GRB
  100. GRB 240312A: GECAM detection of a long burst

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