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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"

36110 results found.

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

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