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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"

36001 results found.

  1. Fermi GRB 220305A: Global MASTER-Net observations report
  2. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  3. GRB 220305A: Fermi GBM observation
  4. GRB 220305A: Enhanced Swift-XRT position
  5. Swift GRB 220305A: Global MASTER-Net observations report
  6. GRB 220305A: Swift-XRT observations
  7. GRB 220305A: Swift detection of a burst
  8. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  9. GRB 220302A: Swift/UVOT Upper Limits
  10. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  11. Fermi GRB 220304A: Global MASTER-Net observations report
  12. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  13. GRB 220302A: Swift-XRT refined Analysis
  14. GRB 220304A: Fermi GBM Final Real-time Localization
  15. GRB 220302A: BOOTES-5/JGT optical upper limit
  16. GRB 220302A: Enhanced Swift-XRT position
  17. GRB 220302A: Swift afterglow detection
  18. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  19. Swift GRB 220302A: Global MASTER-Net observations report
  20. GRB 220302A: Swift detection of a burst
  21. GRB 220228A: Fermi GBM observation
  22. GRB 220228A: Fermi-LAT detection
  23. GRB 220228A: Fermi GBM Final Localization
  24. Konus-Wind detection of GRB 220222A
  25. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  26. IPN triangulation of GRB 220222A
  27. GRB 220101A: The first example of a Petanova
  28. Konus-Wind observation of GRB 220219B
  29. GCN Circ.draft on GRB 220222A
  30. GRB 220219B: Swift-XRT observations
  31. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  32. Fermi GRB 220223A: Global MASTER-Net observations report
  33. GRB 220223A: Fermi GBM Final Real-time Localization
  34. Fermi GRB 220222B: Global MASTER-Net observations report
  35. GRB 220222B: Fermi GBM Final Real-time Localization
  36. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  37. GRB 220219B: Swift ToO observations
  38. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  39. Fermi GRB 220222A: Global MASTER-Net observations report
  40. GRB 220222A: Fermi GBM Final Real-time Localization
  41. ZTF22aabjpxh/AT2022cva: Assy optical observations
  42. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  43. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  44. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  45. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  46. Konus-Wind observation of GRB 220219A
  47. IPN triangulation of GRB 220219A
  48. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  49. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  50. GRB 220218A: BOOTES-5/JGT optical upper limit
  51. GRB 220219A: AGILE/MCAL detection
  52. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  53. GRB 220219A: Fermi GBM Final Real-time Localization
  54. GRB 220218A: Swift detection of a burst
  55. GRB 220211A: redshift lower limit estimating
  56. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  57. Konus-Wind detection of GRB 220209A
  58. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  59. Konus-Wind detection of GRB 220211A
  60. IPN triangulation of GRB 220209A
  61. GRB 211023A: evidence of supernova in LBT spectra
  62. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  63. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  64. ZTF22aaajecp/AT2022cmc: VLA radio detection
  65. GRB 220211A: Fermi GBM observation
  66. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  67. GRB 220214A: Fermi GBM Final Real-time Localization
  68. Fermi GBM trigger 666393834/220212892 is not a GRB
  69. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  70. IPN triangulation of GRB 220211A (short)
  71. GRB 220210A: Insight-HXMT/HE detection
  72. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  73. GRB 220210A: 1.5m OSN optical upper limit
  74. GRB 220210A: Fermi GBM detection
  75. Fermi GRB 220211B: Global MASTER-Net observations report
  76. GRB 220211B: Fermi GBM Final Real-time Localization
  77. GRB 220209A: Fermi-LAT detection
  78. GRB 220210A: Fermi-LAT detection
  79. GRB 220210A: AGILE detection
  80. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  81. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  82. GRB 220210A: Swift/BAT-GUANO localization
  83. Fermi GRB 220211A: Global MASTER-Net observations report
  84. GRB 220211A: Fermi GBM Final Real-time Localization
  85. Fermi GRB 220210A: Global MASTER-Net observations report
  86. GRB 220210A: Fermi GBM Final Real-time Localization
  87. GRB 210919A: Maidanak optical observations
  88. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  89. GRB 220209A: Fermi GBM Detection
  90. GRB 220209A: GECAM detection
  91. GRB 220209A: AGILE/MCAL detection
  92. Fermi GRB 220209A: Global MASTER-Net observations report
  93. GRB 220209A: Fermi GBM Final Real-time Localization
  94. Konus-Wind detection of GRB 220130A
  95. Konus-Wind detection of GRB 220203A
  96. GRB 220203A: GECAM detection
  97. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  98. IPN triangulation of GRB 220203A (short)
  99. IPN triangulation of GRB 220130A
  100. Swift Reaction Wheel Anomaly Update (4 Feb 2022)

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