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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"

5541 results found.

  1. X-ray transient EP240331A: GRANDMA-Kilonova catcher optical upper limit
  2. EP240331A: MASTER optical observations
  3. Transient EP240315a: J-band observations of AT2024eju with WIRC
  4. IceCube-240327B: Upper limits from a search for additional neutrino events in IceCube
  5. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  6. GRB 240329A: Glowbug gamma-ray detection
  7. GRB 240324A: AstroSat CZTI detection of a short burst
  8. GRB 240331A: AstroSat CZTI detection
  9. GRB 240329A: AstroSat CZTI detection
  10. GRB 240329A: GRBAlpha detection
  11. Fermi trigger No 733366352: Global MASTER-Net observations report
  12. Fermi GRB 240329A: Global MASTER-Net observations report
  13. Fermi GRB 240328B: Global MASTER-Net observations report
  14. Fermi GRB 240328A: Global MASTER-Net observations report
  15. X-ray transient EP240315a: continued ATCA monitoring
  16. IceCube-240327B: No candidates from the Zwicky Transient Facility
  17. GRB 240328C: Glowbug gamma-ray detection
  18. IceCube Alert 240327.68: Global MASTER-Net observations report
  19. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  20. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  21. Fermi trigger No 733097506: Global MASTER-Net observations report
  22. X-ray transient EP240315a: Ondrejov D50 optical limit
  23. Fermi trigger No 733092476: Global MASTER-Net observations report
  24. GRB 240320A: Glowbug gamma-ray detection
  25. Fermi trigger No 732937833: Global MASTER-Net observations report
  26. Fermi GRB 240320A: Global MASTER-Net observations report
  27. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  28. Fermi trigger No 732657380: Global MASTER-Net observations report
  29. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  30. X-ray transient EP240315a: ATCA detection of radio counterpart
  31. GRB 240318A: Glowbug gamma-ray detection
  32. GRB 240317C: Glowbug gamma-ray detection
  33. GRB 240318B: Glowbug gamma-ray detection
  34. X-ray transient EP240315a: PRIME near infrared detection
  35. X-ray transient EP240315a: 3.6 m TNG NIR detection
  36. X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
  37. X-ray transient EP240315a: EP-FXT detection of the X-ray afterglow
  38. Fermi GRB 240318A: Global MASTER-Net observations report
  39. GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
  40. GRB 240317A: AstroSat CZTI detection
  41. GRB 240315B: AstroSat CZTI detection
  42. X-ray transient EP240315a: Kitab observatory optical upper limitns
  43. X-ray transient EP240315a: Montarrenti Observatory optical upper limit
  44. Fermi GRB 240317B: Global MASTER-Net observations report
  45. Fermi GRB 240317A: Global MASTER-Net observations report
  46. Fermi trigger No 732299243: Global MASTER-Net observations report
  47. Einstein Probe detected of a fast X-ray transient EP240315a
  48. GRID detection of GRB 240306A
  49. Fermi GRB 240314A: Global MASTER-Net observations report
  50. GRB 240312A: Glowbug gamma-ray detection
  51. GRB 240312A: GECAM detection of a long burst
  52. GRB 240303C: VZLUSAT-2 detection
  53. GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
  54. Fermi trigger No 731839490: Global MASTER-Net observations report
  55. Fermi-LAT gamma-ray observations of IceCube-240307A
  56. GRB 240310B: Glowbug gamma-ray detection
  57. Fermi GRB 240310A: Global MASTER-Net observations report
  58. Swift GRB240309.61: Global MASTER-Net observations report
  59. IceCube-240307A: Upper limits from a search for additional neutrino events in IceCube
  60. Fermi trigger No 731571927: Global MASTER-Net observations report
  61. IceCube Alert 240307.32: Global MASTER-Net observations report
  62. GRB 240306A: AstroSat CZTI detection
  63. Fermi GRB 240306A: Global MASTER-Net observations report
  64. Fermi GRB 240305A: Global MASTER-Net observations report
  65. GRB 240306A: Swift/BAT-GUANO detection of a burst
  66. GRB 240305C: AstroSat CZTI detection of a short burst
  67. Swift GRB240305.18: Global MASTER-Net observations report
  68. Swift GRB240305.16: Global MASTER-Net observations report
  69. Fermi GRB 240305C: Global MASTER-Net observations report
  70. GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
  71. GRB 240305B: Fermi GBM Final Localization
  72. Fermi trigger No 731303574: Global MASTER-Net observations report
  73. GRB 240303B: VZLUSAT-2 detection
  74. IPN triangulation of GRB 240229A
  75. Swift Trigger 1218696: Another trigger on Swift J151857.0-572147
  76. Transient EPW20240219aa: Optical observations with LDT
  77. GRB 240303B: Fermi GBM Detection
  78. Fermi trigger No 731161136: Global MASTER-Net observations report
  79. GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
  80. Swift GRB 240303A: Global MASTER-Net observations report
  81. GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
  82. GRB 240303B: Fermi GBM Final Localization
  83. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  84. GRB 240229A: DDOTI Upper Limits on the Afterglow
  85. GRB 240225B: further SAO RAS optical observations
  86. Fermi GRB 240229A: Global MASTER-Net observations report
  87. IceCube Alert 240229.66: Global MASTER-Net observations report
  88. GRB 240225B: Mondy afterglow observations
  89. Fermi GRB 240227A: Global MASTER-Net observations report
  90. GRB 240216A: GRBAlpha detection
  91. Fermi trigger No 729914426: Global MASTER-Net observations report
  92. GRB 240214A/1H 0451-560: MAXI/GSC detection
  93. GRB 240209A: GOTO optical counterpart candidate
  94. Fermi trigger No 729152364: Global MASTER-Net observations report
  95. Fermi trigger No 729012023: Global MASTER-Net observations report
  96. Fermi trigger No 728749569: Global MASTER-Net observations report
  97. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  98. GRB 240128A: MAXI/GSC detection
  99. GRB 240123A: further SAO RAS optical observations
  100. GRB 240123A: SAO RAS optical observations

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