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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"

27934 results found.

  1. GRB 220306B: Swift-BAT refined analysis
  2. GRB 220306B: AbAO optical observations, possible afterglow candidate
  3. GRB 220306B: BOOTES-1 optical upper limit
  4. GRB 220306B: Swift-XRT refined Analysis
  5. GRB 220306B: Fermi GBM observation
  6. GRB 220306B: Enhanced Swift-XRT position
  7. Swift GRB 220306B: Global MASTER-Net observations report
  8. GRB 220305A: Swift-BAT refined analysis
  9. GRB 220306B: Swift detection of a burst
  10. Fermi GBM Sub-Threshold Detection of GRB 220305A
  11. GRB 220305A: Swift-XRT refined Analysis
  12. GRB 220306A: Fermi GBM Final Real-time Localization
  13. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  14. GRB 220305A: Enhanced Swift-XRT position
  15. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  16. Swift GRB 220305A: Global MASTER-Net observations report
  17. GRB 220305A: Swift-XRT observations
  18. GRB 220305A: Swift detection of a burst
  19. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  20. GRB 220302A: Swift/UVOT Upper Limits
  21. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  22. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  23. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  24. GRB 220302A: Swift-XRT refined Analysis
  25. GRB 220304A: Fermi GBM Final Real-time Localization
  26. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  27. GRB 220302A: BOOTES-5/JGT optical upper limit
  28. Swift resumes autonomous slewing
  29. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  30. GRB 220302A: Enhanced Swift-XRT position
  31. ZTF22aaajecp/AT2022cmc: ATCA detection
  32. GRB 220302A: Swift afterglow detection
  33. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  34. Swift GRB 220302A: Global MASTER-Net observations report
  35. GRB 220302A: Swift detection of a burst
  36. GRB 220228A: Fermi-LAT detection
  37. GRB 220228A: Fermi GBM Final Localization
  38. Konus-Wind detection of GRB 220222A
  39. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  40. IPN triangulation of GRB 220222A
  41. ZTF22aaajecp/AT2022cmc: DECam Photometry
  42. GCN Circ.draft on GRB 220222A
  43. GRB 220219B: Swift-XRT observations
  44. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  45. GRB 220223A: Fermi GBM Final Real-time Localization
  46. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  47. GRB 220222B: Fermi GBM Final Real-time Localization
  48. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  49. GRB 220219B: Swift ToO observations
  50. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  51. GRB 220222A: Fermi GBM Final Real-time Localization
  52. ZTF22aabjpxh/AT2022cva: GMOS-N spectroscopy
  53. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  54. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  55. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  56. Konus-Wind observation of GRB 220219A
  57. IPN triangulation of GRB 220219A
  58. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  59. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  60. GRB 220218A: BOOTES-5/JGT optical upper limit
  61. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  62. GRB 220219A: AGILE/MCAL detection
  63. GRB 220219A: Fermi GBM Final Real-time Localization
  64. GRB 220218A: Swift detection of a burst
  65. Swift GRB220218.94: Global MASTER-Net observations report
  66. Konus-Wind detection of GRB 220209A
  67. Swift resumes pointed science observations
  68. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  69. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  70. Konus-Wind detection of GRB 220211A
  71. IPN triangulation of GRB 220209A
  72. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  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. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  78. IPN triangulation of GRB 220211A (short)
  79. GRB 220210A: Insight-HXMT/HE detection
  80. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  81. GRB 220210A: 1.5m OSN optical upper limit
  82. GRB 220210A: Fermi GBM detection
  83. GRB 220211B: Fermi GBM Final Real-time Localization
  84. GRB 220209A: Fermi-LAT detection
  85. GRB 220210A: Fermi-LAT detection
  86. GRB 220210A: AGILE detection
  87. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  88. GRB 220210A: Swift/BAT-GUANO localization
  89. GRB 220211A: Fermi GBM Final Real-time Localization
  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. GRB 220209A: Fermi GBM Final Real-time Localization
  97. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  98. Konus-Wind detection of GRB 220130A
  99. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  100. Konus-Wind detection of GRB 220203A

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