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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"
  1. Swift resumes pointed science observations
  2. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  3. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  4. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  5. Konus-Wind detection of GRB 220211A
  6. IPN triangulation of GRB 220209A
  7. ZTF22aaajecp: GIT optical follow-up observations
  8. GRB 211023A: evidence of supernova in LBT spectra
  9. ZTF22aaajecp/AT2022cmc: GMOS-N spectroscopy
  10. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  11. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  12. ZTF22aaajecp/AT2022cmc: VLA radio detection
  13. GRB 220211A: Fermi GBM observation
  14. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  15. Fermi trigger No 666489765: Global MASTER-Net observations report
  16. GRB 220214A: Fermi GBM Final Real-time Localization
  17. Fermi GBM trigger 666393834/220212892 is not a GRB
  18. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  19. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220212A
  20. IPN triangulation of GRB 220211A (short)
  21. GRB 220210A: Insight-HXMT/HE detection
  22. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  23. GRB 220210A: 1.5m OSN optical upper limit
  24. GRB 220210A: Fermi GBM detection
  25. Fermi GRB 220211B: Global MASTER-Net observations report
  26. GRB 220211B: Fermi GBM Final Real-time Localization
  27. GRB 220209A: Fermi-LAT detection
  28. GRB 220210A: Fermi-LAT detection
  29. GRB 220210A: AGILE detection
  30. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  31. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  32. GRB 220210A: Swift/BAT-GUANO localization
  33. Fermi GRB 220211A: Global MASTER-Net observations report
  34. GRB 220211A: Fermi GBM Final Real-time Localization
  35. Fermi GRB 220210A: Global MASTER-Net observations report
  36. GRB 220210A: Fermi GBM Final Real-time Localization
  37. GRB 210919A: Maidanak optical observations
  38. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  39. GRB 220209A: Fermi GBM Detection
  40. GRB 220209A: GECAM detection
  41. GRB 220209A: AGILE/MCAL detection
  42. Fermi GRB 220209A: Global MASTER-Net observations report
  43. GRB 220209A: Fermi GBM Final Real-time Localization
  44. IceCube-220205B: Upper limits from a search for additional neutrino events in IceCube
  45. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  46. Fermi-LAT Gamma-ray Observations of IceCube-220205B
  47. Fermi-LAT Gamma-ray Observations of IceCube-220205A
  48. IceCube-220205B: No neutrino counterpart candidates in ANTARES search
  49. Konus-Wind detection of GRB 220130A
  50. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  51. Konus-Wind detection of GRB 220203A
  52. GRB 220203A: GECAM detection
  53. IceCube-220205A - IceCube observation of a high-energy neutrino candidate track-like event
  54. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  55. IPN triangulation of GRB 220203A (short)
  56. IPN triangulation of GRB 220130A
  57. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  58. Fermi-LAT Gamma-ray Observations of IceCube-220202A
  59. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  60. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  61. IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event
  62. IceCube Alert 220202.49: Global MASTER-Net observations report
  63. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  64. GRB 220201A: Fermi GBM Final Localization
  65. GRB 220128A: AstroSat CZTI detection
  66. GRB 220130A: Fermi GBM Observation
  67. Konus-Wind detection of GRB 220128A
  68. IPN triangulation of GRB 220128A (long)
  69. Fermi GRB 220131A: Global MASTER-Net observations report
  70. GRB 220131B: GECAM detection
  71. GRB 220130A: GECAM detection
  72. GRB 220131A: Fermi GBM Final Real-time Localization
  73. Fermi GRB 220129A: Global MASTER-Net observations report
  74. GRB 220129A: Fermi GBM Final Real-time Localization
  75. IceCube-211208A: the optical observation of the candidate PKS0735+178
  76. GRB 220127A: GECAM detection
  77. GECAM observations of a series of bursts from SGR J1935+2154
  78. Konus-Wind detection of GRB 220124A
  79. IPN triangulation of GRB 220124A
  80. GRB 220124A: GECAM detection
  81. Fermi trigger No 664738369: Global MASTER-Net observations report
  82. GRB 220117A, GROND observations
  83. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  84. GRB 220117A: Terskol and AbAO optical upper limits
  85. GRB 220118A: TARGET optical upper limit
  86. GRB 220117B: TARGET optical upper limit
  87. GRB 220121B: GECAM detection
  88. Fermi-LAT-ANTARES 220121a: upper limits from a search for coincident neutrinos with IceCube
  89. AGILE observations of a bright burst from SGR 1935+2154
  90. Fermi-LAT-ANTARES 220121a Coincidence
  91. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  92. IPN triangulation of a bright burst from SGR 1935+2154
  93. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  94. IPN triangulation of GRB 211226A
  95. GRB 220120A: Fermi GBM Final Localization
  96. GRB 220117C: Fermi GBM Observation
  97. GRB 220118A: 2.2m CAHA/CAFOS detections
  98. GRB 220118A: Fermi GBM detection
  99. GRB 220118A: COATLI Optical Observations
  100. GRB 220101A: KAO optical-R observation

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