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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"

36005 results found.

  1. Fermi GBM Sub-Threshold Detection of GRB 220305A
  2. GRB 220305A: Swift-XRT refined Analysis
  3. Fermi GRB 220306A: Global MASTER-Net observations report
  4. GRB 220306A: Fermi GBM Final Real-time Localization
  5. Fermi GRB 220305A: Global MASTER-Net observations report
  6. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  7. GRB 220305A: Fermi GBM observation
  8. GRB 220305A: Enhanced Swift-XRT position
  9. Swift GRB 220305A: Global MASTER-Net observations report
  10. GRB 220305A: Swift-XRT observations
  11. GRB 220305A: Swift detection of a burst
  12. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  13. GRB 220302A: Swift/UVOT Upper Limits
  14. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  15. Fermi GRB 220304A: Global MASTER-Net observations report
  16. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  17. GRB 220302A: Swift-XRT refined Analysis
  18. GRB 220304A: Fermi GBM Final Real-time Localization
  19. GRB 220302A: BOOTES-5/JGT optical upper limit
  20. GRB 220302A: Enhanced Swift-XRT position
  21. GRB 220302A: Swift afterglow detection
  22. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  23. Swift GRB 220302A: Global MASTER-Net observations report
  24. GRB 220302A: Swift detection of a burst
  25. GRB 220228A: Fermi GBM observation
  26. GRB 220228A: Fermi-LAT detection
  27. GRB 220228A: Fermi GBM Final Localization
  28. Konus-Wind detection of GRB 220222A
  29. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  30. IPN triangulation of GRB 220222A
  31. GRB 220101A: The first example of a Petanova
  32. Konus-Wind observation of GRB 220219B
  33. GCN Circ.draft on GRB 220222A
  34. GRB 220219B: Swift-XRT observations
  35. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  36. Fermi GRB 220223A: Global MASTER-Net observations report
  37. GRB 220223A: Fermi GBM Final Real-time Localization
  38. Fermi GRB 220222B: Global MASTER-Net observations report
  39. GRB 220222B: Fermi GBM Final Real-time Localization
  40. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  41. GRB 220219B: Swift ToO observations
  42. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  43. Fermi GRB 220222A: Global MASTER-Net observations report
  44. GRB 220222A: Fermi GBM Final Real-time Localization
  45. ZTF22aabjpxh/AT2022cva: Assy optical observations
  46. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  47. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  48. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  49. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  50. Konus-Wind observation of GRB 220219A
  51. IPN triangulation of GRB 220219A
  52. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  53. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  54. GRB 220218A: BOOTES-5/JGT optical upper limit
  55. GRB 220219A: AGILE/MCAL detection
  56. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  57. GRB 220219A: Fermi GBM Final Real-time Localization
  58. GRB 220218A: Swift detection of a burst
  59. GRB 220211A: redshift lower limit estimating
  60. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  61. Konus-Wind detection of GRB 220209A
  62. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  63. Konus-Wind detection of GRB 220211A
  64. IPN triangulation of GRB 220209A
  65. GRB 211023A: evidence of supernova in LBT spectra
  66. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  67. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  68. ZTF22aaajecp/AT2022cmc: VLA radio detection
  69. GRB 220211A: Fermi GBM observation
  70. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  71. GRB 220214A: Fermi GBM Final Real-time Localization
  72. Fermi GBM trigger 666393834/220212892 is not a GRB
  73. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  74. IPN triangulation of GRB 220211A (short)
  75. GRB 220210A: Insight-HXMT/HE detection
  76. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  77. GRB 220210A: 1.5m OSN optical upper limit
  78. GRB 220210A: Fermi GBM detection
  79. Fermi GRB 220211B: Global MASTER-Net observations report
  80. GRB 220211B: Fermi GBM Final Real-time Localization
  81. GRB 220209A: Fermi-LAT detection
  82. GRB 220210A: Fermi-LAT detection
  83. GRB 220210A: AGILE detection
  84. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  85. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  86. GRB 220210A: Swift/BAT-GUANO localization
  87. Fermi GRB 220211A: Global MASTER-Net observations report
  88. GRB 220211A: Fermi GBM Final Real-time Localization
  89. Fermi GRB 220210A: Global MASTER-Net observations report
  90. GRB 220210A: Fermi GBM Final Real-time Localization
  91. GRB 210919A: Maidanak optical observations
  92. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  93. GRB 220209A: Fermi GBM Detection
  94. GRB 220209A: GECAM detection
  95. GRB 220209A: AGILE/MCAL detection
  96. Fermi GRB 220209A: Global MASTER-Net observations report
  97. GRB 220209A: Fermi GBM Final Real-time Localization
  98. Konus-Wind detection of GRB 220130A
  99. Konus-Wind detection of GRB 220203A
  100. GRB 220203A: GECAM detection

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