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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"

39322 results found.

  1. GRB 240411A: Fermi GBM Final Real-time Localization
  2. EP240408A: MASTER optical observations
  3. EP240408a: GROND detection of a candidate counterpart
  4. EP240408a: Upper limits from GECAM-B Observation
  5. GRB 240405A: GRBAlpha detection
  6. Swift Trigger 1220736: detection of 4U 1543-62.
  7. GRB 240408B: AstroSat CZTI detection
  8. Fermi GRB 240408A: Global MASTER-Net observations report
  9. GRB 240408A: Fermi GBM Final Real-time Localization
  10. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  11. GRB 240402C: CALET Gamma-Ray Burst Monitor detection
  12. Fermi GRB 240407A: Global MASTER-Net observations report
  13. GRB 240407A: Fermi GBM Final Real-time Localization
  14. Fermi-LAT gamma-ray observations of IceCube-240327B
  15. Fermi-LAT gamma-ray observations of IceCube-240327A
  16. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  17. Fermi GRB 240405B: Global MASTER-Net observations report
  18. GRB 240405B: Fermi GBM Final Real-time Localization
  19. GRB 240402C: Glowbug gamma-ray detection
  20. GRB 240405A: Fermi GBM Final Real-time Localization
  21. GRB 240402C: GRBAlpha detection
  22. GRB 240331A: GRBAlpha detection
  23. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  24. GRB 240403B: Glowbug gamma-ray detection
  25. GRB 240403A: Glowbug gamma-ray detection
  26. LXT 240402A/GRB 240402B: Glowbug gamma-ray detection
  27. Konus-Wind detection of LXT 240402A/GRB 240402B
  28. GRB/FXT 240402B: Kinder optical counterpart candidate
  29. IceCube-240327B: GRANDMA observations of 4FGL J0555.9+0030
  30. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  31. GRB 240403A: Fermi GBM Detection
  32. LXT 240402A: EP-FXT detection of the X-ray afterglow
  33. Fermi GRB 240404A: Global MASTER-Net observations report
  34. GRB 240404A: Fermi GBM Final Real-time Localization
  35. LXT 240402A: MASTER optical observations with AGN in error-box
  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. EP240331A: MASTER optical observations
  43. X-ray transient EP20240331a: MeerLICHT optical upper limits
  44. IBAS Alert n.10651 not a GRB
  45. Integral GRB240401.69: Global MASTER-Net observations report
  46. GRB 240329A: Glowbug gamma-ray detection
  47. GRB 240324A: AstroSat CZTI detection of a short burst
  48. GRB 240331A: AstroSat CZTI detection
  49. GRB 240329A: AstroSat CZTI detection
  50. GRB 240331A: Fermi GBM Final Real-time Localization
  51. GRB 240329A: GRBAlpha detection
  52. Fermi trigger No 733366352: Global MASTER-Net observations report
  53. Fermi GRB 240329A: Global MASTER-Net observations report
  54. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  55. GRB 240329A: Fermi GBM Final Real-time Localization
  56. Fermi GRB 240328B: Global MASTER-Net observations report
  57. Fermi GRB 240328A: Global MASTER-Net observations report
  58. GRB 240328C: Glowbug gamma-ray detection
  59. GRB 240328B: Fermi GBM Final Real-time Localization
  60. GRB 240328A: Fermi GBM Final Real-time Localization
  61. IceCube Alert 240327.68: Global MASTER-Net observations report
  62. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  63. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  64. X-ray transient EP 240315a: Second epoch Chandra observations
  65. Fermi trigger No 733097506: Global MASTER-Net observations report
  66. Transient EPW20240219aa: REM optical/NIR further observations
  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. X-ray transient EP240315a: PRIME near infrared detection
  84. GRB 240317B: Fermi GBM Observation
  85. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  86. Fermi GRB 240318A: Global MASTER-Net observations report
  87. GRB 240318A: Fermi GBM Final Real-time Localization
  88. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  89. GRB 240317A: AstroSat CZTI detection
  90. GRB 240315B: AstroSat CZTI detection
  91. X-ray transient EP240315a: Kitab observatory optical upper limitns
  92. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  93. Fermi GRB 240317B: Global MASTER-Net observations report
  94. Fermi GRB 240317A: Global MASTER-Net observations report
  95. GRB 240317B: Fermi GBM Final Real-time Localization
  96. GRB 240317A: Fermi GBM Final Real-time Localization
  97. X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
  98. X-ray transient EP240315a: Nanshan/HMT optical upper limit
  99. Fermi trigger No 732299243: Global MASTER-Net observations report
  100. Einstein Probe detected of a fast X-ray transient EP240315a

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