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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"

24592 results found.

  1. Fermi GRB 220310B: Global MASTER-Net observations report
  2. GRB 220310B: Fermi GBM Final Real-time Localization
  3. GRB 220308B: Fermi GBM detection
  4. MAXI GRB220310.02: Global MASTER-Net observations report
  5. Konus-Wind detection of GRB 220308A
  6. IceCube-220306A: No significant detection in HAWC
  7. IceCube-220303A: No significant detection in HAWC
  8. Fermi GRB 220309A: Global MASTER-Net observations report
  9. GRB 220309A: Fermi GBM Final Real-time Localization
  10. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  11. IPN triangulation of GRB 220308A (long / very bright)
  12. IPN triangulation of GRB 220305B
  13. Fermi trigger No 668410535: Global MASTER-Net observations report
  14. GRB 220304A Fermi GBM detection
  15. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  16. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  17. GRB 220306B: Swift-BAT refined analysis
  18. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  19. GRB 220306B: Fermi GBM observation
  20. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  21. Swift GRB 220306B: Global MASTER-Net observations report
  22. GRB 220305A: Swift-BAT refined analysis
  23. GRB 220306B: Swift detection of a burst
  24. Fermi GBM Sub-Threshold Detection of GRB 220305A
  25. Fermi GRB 220306A: Global MASTER-Net observations report
  26. GRB 220306A: Fermi GBM Final Real-time Localization
  27. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  28. Fermi GRB 220305A: Global MASTER-Net observations report
  29. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  30. GRB 220305A: Fermi GBM observation
  31. Swift GRB 220305A: Global MASTER-Net observations report
  32. GRB 220305A: Swift detection of a burst
  33. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  34. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  35. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  36. IceCube Alert 220304.74: Global MASTER-Net observations report
  37. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  38. Fermi GRB 220304A: Global MASTER-Net observations report
  39. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  40. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  41. GRB 220304A: Fermi GBM Final Real-time Localization
  42. IceCube Alert 220303.75: Global MASTER-Net observations report
  43. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  44. GRB 220302A: BOOTES-5/JGT optical upper limit
  45. GRB 220302A: Swift afterglow detection
  46. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  47. Swift GRB 220302A: Global MASTER-Net observations report
  48. GRB 220302A: Swift detection of a burst
  49. GRB 220228A: Fermi GBM observation
  50. GRB 220228A: Fermi-LAT detection
  51. GRB 220228A: Fermi GBM Final Localization
  52. Konus-Wind detection of GRB 220222A
  53. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  54. Fermi trigger No 667737010: Global MASTER-Net observations report
  55. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  56. IceCube Alert 220225.59: Global MASTER-Net observations report
  57. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  58. IPN triangulation of GRB 220222A
  59. GCN Circ.draft on GRB 220222A
  60. Fermi GRB 220223A: Global MASTER-Net observations report
  61. GRB 220223A: Fermi GBM Final Real-time Localization
  62. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  63. Fermi GRB 220222B: Global MASTER-Net observations report
  64. GRB 220222B: Fermi GBM Final Real-time Localization
  65. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  66. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  67. Fermi GRB 220222A: Global MASTER-Net observations report
  68. GRB 220222A: Fermi GBM Final Real-time Localization
  69. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  70. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  71. IceCube Alert 220221.03: Global MASTER-Net observations report
  72. Konus-Wind observation of GRB 220219A
  73. IPN triangulation of GRB 220219A
  74. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  75. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  76. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  77. IceCube Alert 220220.60: Global MASTER-Net observations report
  78. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A
  79. Fermi trigger No 666962499: Global MASTER-Net observations report
  80. GRB 220218A: BOOTES-5/JGT optical upper limit
  81. GRB 220219A: AGILE/MCAL detection
  82. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  83. GRB 220219A: Fermi GBM Final Real-time Localization
  84. GRB 220218A: Swift detection of a burst
  85. Swift GRB220218.94: Global MASTER-Net observations report
  86. GRB 220211A: redshift lower limit estimating
  87. Konus-Wind detection of GRB 220209A
  88. Swift resumes pointed science observations
  89. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  90. Konus-Wind detection of GRB 220211A
  91. IPN triangulation of GRB 220209A
  92. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  93. ZTF22aaajecp/AT2022cmc: VLA radio detection
  94. GRB 220211A: Fermi GBM observation
  95. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  96. Fermi trigger No 666489765: Global MASTER-Net observations report
  97. GRB 220214A: Fermi GBM Final Real-time Localization
  98. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  99. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  100. IPN triangulation of GRB 220211A (short)

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