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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"

33590 results found.

  1. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  2. GRB 220302A: Swift-XRT refined Analysis
  3. GRB 220304A: Fermi GBM Final Real-time Localization
  4. GRB 220302A: BOOTES-5/JGT optical upper limit
  5. GRB 220302A: Enhanced Swift-XRT position
  6. GRB 220302A: Swift afterglow detection
  7. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  8. Swift GRB 220302A: Global MASTER-Net observations report
  9. GRB 220302A: Swift detection of a burst
  10. GRB 220228A: Fermi GBM observation
  11. GRB 220228A: Fermi-LAT detection
  12. GRB 220228A: Fermi GBM Final Localization
  13. Konus-Wind detection of GRB 220222A
  14. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  15. IPN triangulation of GRB 220222A
  16. GRB 220101A: The first example of a Petanova
  17. Konus-Wind observation of GRB 220219B
  18. GCN Circ.draft on GRB 220222A
  19. GRB 220219B: Swift-XRT observations
  20. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  21. Fermi GRB 220223A: Global MASTER-Net observations report
  22. GRB 220223A: Fermi GBM Final Real-time Localization
  23. Fermi GRB 220222B: Global MASTER-Net observations report
  24. GRB 220222B: Fermi GBM Final Real-time Localization
  25. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  26. GRB 220219B: Swift ToO observations
  27. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  28. Fermi GRB 220222A: Global MASTER-Net observations report
  29. GRB 220222A: Fermi GBM Final Real-time Localization
  30. ZTF22aabjpxh/AT2022cva: Assy optical observations
  31. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  32. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  33. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  34. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  35. Konus-Wind observation of GRB 220219A
  36. IPN triangulation of GRB 220219A
  37. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  38. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  39. GRB 220218A: BOOTES-5/JGT optical upper limit
  40. GRB 220219A: AGILE/MCAL detection
  41. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  42. GRB 220219A: Fermi GBM Final Real-time Localization
  43. GRB 220218A: Swift detection of a burst
  44. GRB 220211A: redshift lower limit estimating
  45. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  46. Konus-Wind detection of GRB 220209A
  47. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  48. Konus-Wind detection of GRB 220211A
  49. IPN triangulation of GRB 220209A
  50. GRB 211023A: evidence of supernova in LBT spectra
  51. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  52. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  53. ZTF22aaajecp/AT2022cmc: VLA radio detection
  54. GRB 220211A: Fermi GBM observation
  55. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  56. GRB 220214A: Fermi GBM Final Real-time Localization
  57. Fermi GBM trigger 666393834/220212892 is not a GRB
  58. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  59. IPN triangulation of GRB 220211A (short)
  60. GRB 220210A: Insight-HXMT/HE detection
  61. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  62. GRB 220210A: 1.5m OSN optical upper limit
  63. GRB 220210A: Fermi GBM detection
  64. Fermi GRB 220211B: Global MASTER-Net observations report
  65. GRB 220211B: Fermi GBM Final Real-time Localization
  66. GRB 220209A: Fermi-LAT detection
  67. GRB 220210A: Fermi-LAT detection
  68. GRB 220210A: AGILE detection
  69. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  70. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  71. GRB 220210A: Swift/BAT-GUANO localization
  72. Fermi GRB 220211A: Global MASTER-Net observations report
  73. GRB 220211A: Fermi GBM Final Real-time Localization
  74. Fermi GRB 220210A: Global MASTER-Net observations report
  75. GRB 220210A: Fermi GBM Final Real-time Localization
  76. GRB 210919A: Maidanak optical observations
  77. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  78. GRB 220209A: Fermi GBM Detection
  79. GRB 220209A: GECAM detection
  80. GRB 220209A: AGILE/MCAL detection
  81. Fermi GRB 220209A: Global MASTER-Net observations report
  82. GRB 220209A: Fermi GBM Final Real-time Localization
  83. Konus-Wind detection of GRB 220130A
  84. Konus-Wind detection of GRB 220203A
  85. GRB 220203A: GECAM detection
  86. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  87. IPN triangulation of GRB 220203A (short)
  88. IPN triangulation of GRB 220130A
  89. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  90. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  91. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  92. GRB 220201A: Fermi GBM Final Localization
  93. GRB 220128A: AstroSat CZTI detection
  94. GRB 220130A: Fermi GBM Observation
  95. Konus-Wind detection of GRB 220128A
  96. IPN triangulation of GRB 220128A (long)
  97. Fermi GRB 220131A: Global MASTER-Net observations report
  98. GRB 220131B: GECAM detection
  99. GRB 220130A: GECAM detection
  100. GRB 220131A: Fermi GBM Final Real-time Localization

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