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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"

28231 results found.

  1. GRB 220308B: Fermi GBM detection
  2. GRB 220310A: MAXI/GSC detection
  3. MAXI GRB220310.02: Global MASTER-Net observations report
  4. IceCube-220306A: No significant detection in HAWC
  5. IceCube-220303A: No significant detection in HAWC
  6. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  7. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  8. IPN triangulation of GRB 220308A (long / very bright)
  9. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  10. GRB 220306B: Tautenburg observations
  11. GRB 220304A Fermi GBM detection
  12. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  13. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  14. GRB 220306B: Swift-BAT refined analysis
  15. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  16. GRB 220306B: AbAO optical observations, possible afterglow candidate
  17. GRB 220306B: BOOTES-1 optical upper limit
  18. GRB 220306B: Swift-XRT refined Analysis
  19. GRB 220306B: Fermi GBM observation
  20. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  21. GRB 220306B: Enhanced Swift-XRT position
  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. GRB 220305A: Swift-XRT refined Analysis
  26. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  27. GRB 220305A: Fermi GBM observation
  28. GRB 220305A: Enhanced Swift-XRT position
  29. GRB 220305A: Swift-XRT observations
  30. GRB 220302A: Swift/UVOT Upper Limits
  31. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  32. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  33. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  34. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  35. Swift resumes autonomous slewing
  36. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  37. GRB 220302A: Enhanced Swift-XRT position
  38. GRB 220302A: Swift afterglow detection
  39. GRB 220228A: Fermi GBM observation
  40. Konus-Wind detection of GRB 220222A
  41. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  42. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  43. IPN triangulation of GRB 220222A
  44. GRB 220101A: The first example of a Petanova
  45. Konus-Wind observation of GRB 220219B
  46. GCN Circ.draft on GRB 220222A
  47. GRB 220219B: Swift-XRT observations
  48. IceCube-220221A: Upper limits from a search for additional neutrino events in IceCube
  49. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  50. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  51. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  52. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  53. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  54. Fermi trigger No 666962499: Global MASTER-Net observations report
  55. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  56. GRB 220211A: redshift lower limit estimating
  57. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  58. ZTF22aaajecp: GIT optical follow-up observations
  59. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  60. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  61. IPN triangulation of GRB 220211A (short)
  62. GRB 220210A: Insight-HXMT/HE detection
  63. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  64. GRB 220210A: Fermi GBM detection
  65. GRB 220210A: Fermi-LAT detection
  66. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  67. GRB 220210A: Swift/BAT-GUANO localization
  68. Fermi GRB 220210A: Global MASTER-Net observations report
  69. GRB 210919A: Maidanak optical observations
  70. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  71. GRB 220209A: Fermi GBM Detection
  72. GRB 220209A: GECAM detection
  73. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  74. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  75. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  76. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  77. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  78. GRB 220203A: GECAM detection
  79. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  80. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  81. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  82. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  83. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  84. GRB 220128A: AstroSat CZTI detection
  85. GRB 220130A: Fermi GBM Observation
  86. IPN triangulation of GRB 220128A (long)
  87. GRB 220131B: GECAM detection
  88. GRB 220130A: GECAM detection
  89. GRB 220127A: GECAM detection
  90. IPN triangulation of GRB 220124A
  91. GRB 220124A: GECAM detection
  92. GRB 220117A, GROND observations
  93. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  94. GRB 220117A: Terskol and AbAO optical upper limits
  95. GRB 220118A: TARGET optical upper limit
  96. GRB 220117B: TARGET optical upper limit
  97. GRB 220121B: GECAM detection
  98. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  99. Fermi-LAT-ANTARES 220121a Coincidence
  100. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20

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