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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"

37713 results found.

  1. GRB 240411B: Swift-XRT refined Analysis
  2. IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event
  3. GRB 240411B: 1.3m DFOT Optical observations
  4. GRB 240411A: GRBAlpha detection
  5. GRB 240411B: OHP/T193 optical observations
  6. GRB 240405A: Glowbug gamma-ray detection
  7. GRB 240411B: Enhanced Swift-XRT position
  8. GRB 240411B: LCO optical afterglow detection
  9. GRB 240411B: Swift detection of a burst
  10. GRB 240408B: GRBAlpha detection
  11. GRB 240411A: Fermi GBM Final Real-time Localization
  12. EP240408a: Upper limits from GECAM-B Observation
  13. GRB 240405A: GRBAlpha detection
  14. GRB 240408B: AstroSat CZTI detection
  15. Fermi GRB 240408A: Global MASTER-Net observations report
  16. GRB 240408A: Fermi GBM Final Real-time Localization
  17. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  18. GRB 240402C: CALET Gamma-Ray Burst Monitor detection
  19. Fermi GRB 240407A: Global MASTER-Net observations report
  20. GRB 240407A: Fermi GBM Final Real-time Localization
  21. Fermi-LAT gamma-ray observations of IceCube-240327B
  22. Fermi-LAT gamma-ray observations of IceCube-240327A
  23. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  24. Fermi GRB 240405B: Global MASTER-Net observations report
  25. GRB 240405B: Fermi GBM Final Real-time Localization
  26. GRB 240402C: Glowbug gamma-ray detection
  27. GRB 240405A: Fermi GBM Final Real-time Localization
  28. GRB 240402C: GRBAlpha detection
  29. GRB 240331A: GRBAlpha detection
  30. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  31. GRB 240403B: Glowbug gamma-ray detection
  32. GRB 240403A: Glowbug gamma-ray detection
  33. LXT 240402A/GRB 240402B: Glowbug gamma-ray detection
  34. Konus-Wind detection of LXT 240402A/GRB 240402B
  35. GRB/FXT 240402B: Kinder optical counterpart candidate
  36. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  37. GRB 240403A: Fermi GBM Detection
  38. LXT 240402A: EP-FXT detection of the X-ray afterglow
  39. Fermi GRB 240404A: Global MASTER-Net observations report
  40. GRB 240404A: Fermi GBM Final Real-time Localization
  41. GRB 240402B: GWAC-F50A optical upper limit
  42. GRB 240402B: GECAM-C detection
  43. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  44. Fermi trigger No 733808041: Global MASTER-Net observations report
  45. Fermi GRB 240402A: Global MASTER-Net observations report
  46. GRB 240402A: Fermi GBM Final Real-time Localization
  47. IBAS Alert n.10651 not a GRB
  48. GRB 240329A: Glowbug gamma-ray detection
  49. GRB 240324A: AstroSat CZTI detection of a short burst
  50. GRB 240331A: AstroSat CZTI detection
  51. GRB 240329A: AstroSat CZTI detection
  52. GRB 240331A: Fermi GBM Final Real-time Localization
  53. GRB 240329A: GRBAlpha detection
  54. Fermi trigger No 733366352: Global MASTER-Net observations report
  55. Fermi GRB 240329A: Global MASTER-Net observations report
  56. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  57. GRB 240329A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 240328B: Global MASTER-Net observations report
  59. Fermi GRB 240328A: Global MASTER-Net observations report
  60. GRB 240328C: Glowbug gamma-ray detection
  61. GRB 240328B: Fermi GBM Final Real-time Localization
  62. GRB 240328A: Fermi GBM Final Real-time Localization
  63. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  64. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  65. X-ray transient EP 240315a: Second epoch Chandra observations
  66. Fermi trigger No 733097506: Global MASTER-Net observations report
  67. Fermi trigger No 733092476: Global MASTER-Net observations report
  68. GRB 240320A: Glowbug gamma-ray detection
  69. Fermi trigger No 732937833: Global MASTER-Net observations report
  70. GRB 240318A: Fermi GBM Observation
  71. Fermi GRB 240320A: Global MASTER-Net observations report
  72. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  73. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  74. Fermi trigger No 732657380: Global MASTER-Net observations report
  75. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  76. GRB 240320A: Fermi GBM Final Real-time Localization
  77. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  78. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  79. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  80. GRB 240318A: Glowbug gamma-ray detection
  81. GRB 240317C: Glowbug gamma-ray detection
  82. GRB 240318B: Glowbug gamma-ray detection
  83. GRB 240317B: Fermi GBM Observation
  84. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  85. Fermi GRB 240318A: Global MASTER-Net observations report
  86. GRB 240318A: Fermi GBM Final Real-time Localization
  87. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  88. GRB 240317A: AstroSat CZTI detection
  89. GRB 240315B: AstroSat CZTI detection
  90. X-ray transient EP240315a: Kitab observatory optical upper limitns
  91. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  92. Fermi GRB 240317B: Global MASTER-Net observations report
  93. Fermi GRB 240317A: Global MASTER-Net observations report
  94. GRB 240317B: Fermi GBM Final Real-time Localization
  95. GRB 240317A: Fermi GBM Final Real-time Localization
  96. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  97. Fermi trigger No 732299243: Global MASTER-Net observations report
  98. GRID detection of GRB 240306A
  99. Changes to the Fermi-GBM Triggering Thresholds
  100. GRB 240315A: Fermi GBM Final Real-time Localization

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