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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"

24594 results found.

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

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