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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"

39455 results found.

  1. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  2. IPN triangulation of GRB 220305B
  3. Fermi trigger No 668410535: Global MASTER-Net observations report
  4. GRB 220306B: Tautenburg observations
  5. GRB 220304A Fermi GBM detection
  6. GRB 220306B: Swift-BAT refined analysis
  7. GRB 220306B: AbAO optical observations, possible afterglow candidate
  8. GRB 220306B: BOOTES-1 optical upper limit
  9. GRB 220306B: Swift-XRT refined Analysis
  10. GRB 220306B: Fermi GBM observation
  11. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  12. GRB 220306B: Enhanced Swift-XRT position
  13. Swift GRB 220306B: Global MASTER-Net observations report
  14. GRB 220305A: Swift-BAT refined analysis
  15. GRB 220306B: Swift detection of a burst
  16. Fermi GBM Sub-Threshold Detection of GRB 220305A
  17. GRB 220305A: Swift-XRT refined Analysis
  18. Fermi GRB 220306A: Global MASTER-Net observations report
  19. GRB 220306A: Fermi GBM Final Real-time Localization
  20. Fermi GRB 220305A: Global MASTER-Net observations report
  21. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  22. GRB 220305A: Fermi GBM observation
  23. GRB 220305A: Enhanced Swift-XRT position
  24. Swift GRB 220305A: Global MASTER-Net observations report
  25. GRB 220305A: Swift-XRT observations
  26. GRB 220305A: Swift detection of a burst
  27. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  28. GRB 220302A: Swift/UVOT Upper Limits
  29. IceCube Alert 220304.74: Global MASTER-Net observations report
  30. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  31. Fermi GRB 220304A: Global MASTER-Net observations report
  32. GRB 220304A: BALROG localization (Fermi Trigger / GRB 220304228)
  33. GRB 220302A: Swift-XRT refined Analysis
  34. GRB 220304A: Fermi GBM Final Real-time Localization
  35. IceCube Alert 220303.75: Global MASTER-Net observations report
  36. GRB 220302A: BOOTES-5/JGT optical upper limit
  37. GRB 220302A: Enhanced Swift-XRT position
  38. GRB 220302A: Swift afterglow detection
  39. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  40. Swift GRB 220302A: Global MASTER-Net observations report
  41. GRB 220302A: Swift detection of a burst
  42. GRB 220228A: Fermi GBM observation
  43. GRB 220228A: Fermi-LAT detection
  44. GRB 220228A: Fermi GBM Final Localization
  45. Konus-Wind detection of GRB 220222A
  46. Fermi trigger No 667737010: Global MASTER-Net observations report
  47. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  48. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  49. IceCube Alert 220225.59: Global MASTER-Net observations report
  50. IceCube-220225A - IceCube observation of a high-energy neutrino candidate track-like event
  51. IPN triangulation of GRB 220222A
  52. GRB 220101A: The first example of a Petanova
  53. Konus-Wind observation of GRB 220219B
  54. GCN Circ.draft on GRB 220222A
  55. GRB 220219B: Swift-XRT observations
  56. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  57. Fermi GRB 220223A: Global MASTER-Net observations report
  58. GRB 220223A: Fermi GBM Final Real-time Localization
  59. Fermi GRB 220222B: Global MASTER-Net observations report
  60. GRB 220222B: Fermi GBM Final Real-time Localization
  61. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  62. GRB 220219B: Swift ToO observations
  63. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  64. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  65. Fermi GRB 220222A: Global MASTER-Net observations report
  66. GRB 220222A: Fermi GBM Final Real-time Localization
  67. ZTF22aabjpxh/AT2022cva: Assy optical observations
  68. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  69. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  70. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  71. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  72. IceCube Alert 220221.03: Global MASTER-Net observations report
  73. Konus-Wind observation of GRB 220219A
  74. IPN triangulation of GRB 220219A
  75. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  76. Fermi Gamma-ray Burst Monitor trigger 667074291/220220767 is not a GRB
  77. IceCube Alert 220220.60: Global MASTER-Net observations report
  78. Fermi trigger No 666962499: Global MASTER-Net observations report
  79. GRB 220218A: BOOTES-5/JGT optical upper limit
  80. GRB 220219A: AGILE/MCAL detection
  81. GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
  82. GRB 220219A: Fermi GBM Final Real-time Localization
  83. GRB 220218A: Swift detection of a burst
  84. Swift GRB220218.94: Global MASTER-Net observations report
  85. GRB 220211A: redshift lower limit estimating
  86. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  87. Konus-Wind detection of GRB 220209A
  88. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  89. Konus-Wind detection of GRB 220211A
  90. IPN triangulation of GRB 220209A
  91. ZTF22aaajecp: GIT optical follow-up observations
  92. GRB 211023A: evidence of supernova in LBT spectra
  93. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  94. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  95. ZTF22aaajecp/AT2022cmc: VLA radio detection
  96. GRB 220211A: Fermi GBM observation
  97. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  98. Fermi trigger No 666489765: Global MASTER-Net observations report
  99. GRB 220214A: Fermi GBM Final Real-time Localization
  100. Fermi GBM trigger 666393834/220212892 is not a GRB

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