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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"

39320 results found.

  1. EP240408a: GROND detection of a candidate counterpart
  2. EP240408a: Upper limits from GECAM-B Observation
  3. GRB 240405A: GRBAlpha detection
  4. Swift Trigger 1220736: detection of 4U 1543-62.
  5. GRB 240408B: AstroSat CZTI detection
  6. Fermi GRB 240408A: Global MASTER-Net observations report
  7. GRB 240408A: Fermi GBM Final Real-time Localization
  8. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  9. GRB 240402C: CALET Gamma-Ray Burst Monitor detection
  10. Fermi GRB 240407A: Global MASTER-Net observations report
  11. GRB 240407A: Fermi GBM Final Real-time Localization
  12. Fermi-LAT gamma-ray observations of IceCube-240327B
  13. Fermi-LAT gamma-ray observations of IceCube-240327A
  14. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  15. Fermi GRB 240405B: Global MASTER-Net observations report
  16. GRB 240405B: Fermi GBM Final Real-time Localization
  17. GRB 240402C: Glowbug gamma-ray detection
  18. GRB 240405A: Fermi GBM Final Real-time Localization
  19. GRB 240402C: GRBAlpha detection
  20. GRB 240331A: GRBAlpha detection
  21. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  22. GRB 240403B: Glowbug gamma-ray detection
  23. GRB 240403A: Glowbug gamma-ray detection
  24. LXT 240402A/GRB 240402B: Glowbug gamma-ray detection
  25. Konus-Wind detection of LXT 240402A/GRB 240402B
  26. GRB/FXT 240402B: Kinder optical counterpart candidate
  27. IceCube-240327B: GRANDMA observations of 4FGL J0555.9+0030
  28. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  29. GRB 240403A: Fermi GBM Detection
  30. LXT 240402A: EP-FXT detection of the X-ray afterglow
  31. Fermi GRB 240404A: Global MASTER-Net observations report
  32. GRB 240404A: Fermi GBM Final Real-time Localization
  33. LXT 240402A: MASTER optical observations with AGN in error-box
  34. GRB 240402B: GWAC-F50A optical upper limit
  35. GRB 240402B: GECAM-C detection
  36. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  37. Fermi trigger No 733808041: Global MASTER-Net observations report
  38. Fermi GRB 240402A: Global MASTER-Net observations report
  39. GRB 240402A: Fermi GBM Final Real-time Localization
  40. EP240331A: MASTER optical observations
  41. X-ray transient EP20240331a: MeerLICHT optical upper limits
  42. IBAS Alert n.10651 not a GRB
  43. Integral GRB240401.69: Global MASTER-Net observations report
  44. GRB 240329A: Glowbug gamma-ray detection
  45. GRB 240324A: AstroSat CZTI detection of a short burst
  46. GRB 240331A: AstroSat CZTI detection
  47. GRB 240329A: AstroSat CZTI detection
  48. GRB 240331A: Fermi GBM Final Real-time Localization
  49. GRB 240329A: GRBAlpha detection
  50. Fermi trigger No 733366352: Global MASTER-Net observations report
  51. Fermi GRB 240329A: Global MASTER-Net observations report
  52. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  53. GRB 240329A: Fermi GBM Final Real-time Localization
  54. Fermi GRB 240328B: Global MASTER-Net observations report
  55. Fermi GRB 240328A: Global MASTER-Net observations report
  56. GRB 240328C: Glowbug gamma-ray detection
  57. GRB 240328B: Fermi GBM Final Real-time Localization
  58. GRB 240328A: Fermi GBM Final Real-time Localization
  59. IceCube Alert 240327.68: Global MASTER-Net observations report
  60. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  61. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  62. X-ray transient EP 240315a: Second epoch Chandra observations
  63. Fermi trigger No 733097506: Global MASTER-Net observations report
  64. Transient EPW20240219aa: REM optical/NIR further observations
  65. Fermi trigger No 733092476: Global MASTER-Net observations report
  66. GRB 240320A: Glowbug gamma-ray detection
  67. Fermi trigger No 732937833: Global MASTER-Net observations report
  68. GRB 240318A: Fermi GBM Observation
  69. Fermi GRB 240320A: Global MASTER-Net observations report
  70. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  71. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  72. Fermi trigger No 732657380: Global MASTER-Net observations report
  73. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  74. GRB 240320A: Fermi GBM Final Real-time Localization
  75. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  76. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  77. Fermi Gamma-ray Burst Monitor trigger 732299243/240316686 is not a GRB
  78. GRB 240318A: Glowbug gamma-ray detection
  79. GRB 240317C: Glowbug gamma-ray detection
  80. GRB 240318B: Glowbug gamma-ray detection
  81. X-ray transient EP240315a: PRIME near infrared detection
  82. GRB 240317B: Fermi GBM Observation
  83. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  84. Fermi GRB 240318A: Global MASTER-Net observations report
  85. GRB 240318A: Fermi GBM Final Real-time Localization
  86. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  87. GRB 240317A: AstroSat CZTI detection
  88. GRB 240315B: AstroSat CZTI detection
  89. X-ray transient EP240315a: Kitab observatory optical upper limitns
  90. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  91. Fermi GRB 240317B: Global MASTER-Net observations report
  92. Fermi GRB 240317A: Global MASTER-Net observations report
  93. GRB 240317B: Fermi GBM Final Real-time Localization
  94. GRB 240317A: Fermi GBM Final Real-time Localization
  95. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  96. X-ray transient EP240315a: Nanshan/HMT optical upper limit
  97. Fermi trigger No 732299243: Global MASTER-Net observations report
  98. Einstein Probe detected of a fast X-ray transient EP240315a
  99. GRID detection of GRB 240306A
  100. Changes to the Fermi-GBM Triggering Thresholds

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