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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"

32756 results found.

  1. GRB 220310A: MASTER optical counterpart detection
  2. GRB 220310A: Swift ToO observations
  3. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  4. ZTF22aaajecp/AT2022cmc: Hubble Space Telescope Observations
  5. Fermi GRB 220310B: Global MASTER-Net observations report
  6. Konus-Wind detection of GRB 220308A
  7. IceCube-220306A: No significant detection in HAWC
  8. IceCube-220303A: No significant detection in HAWC
  9. ZTF22aabjpxh/AT2022cva: AMI-LA radio observation
  10. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  11. Fermi GRB 220309A: Global MASTER-Net observations report
  12. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  13. IPN triangulation of GRB 220308A (long / very bright)
  14. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  15. IPN triangulation of GRB 220305B
  16. GRB 220306B: Tautenburg observations
  17. GRB 220304A Fermi GBM detection
  18. GRB 220306B: Swift-BAT refined analysis
  19. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  20. GRB 220306B: AbAO optical observations, possible afterglow candidate
  21. GRB 220306B: Swift-XRT refined Analysis
  22. GRB 220306B: Fermi GBM observation
  23. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  24. Swift GRB 220306B: Global MASTER-Net observations report
  25. GRB 220305A: Swift-BAT refined analysis
  26. Fermi GBM Sub-Threshold Detection of GRB 220305A
  27. GRB 220305A: Swift-XRT refined Analysis
  28. Fermi GRB 220306A: Global MASTER-Net observations report
  29. Fermi GRB 220305A: Global MASTER-Net observations report
  30. Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
  31. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  32. Swift GRB 220305A: Global MASTER-Net observations report
  33. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  34. GRB 220302A: Swift/UVOT Upper Limits
  35. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  36. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  37. Fermi GRB 220304A: Global MASTER-Net observations report
  38. GRB 220302A: Swift-XRT refined Analysis
  39. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  40. ZTF22aaajecp/AT2022cmc: ATCA detection
  41. GRB 220302A: Swift afterglow detection
  42. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  43. Swift GRB 220302A: Global MASTER-Net observations report
  44. GRB 220228A: Fermi GBM observation
  45. GRB 220228A: Fermi-LAT detection
  46. Konus-Wind detection of GRB 220222A
  47. ZTF22aaajecp/AT2022cmc: JCMT SCUBA-2 sub-mm observations
  48. Fermi-LAT Gamma-ray Observations of IceCube-220225A
  49. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  50. IPN triangulation of GRB 220222A
  51. GRB 220101A: The first example of a Petanova
  52. Konus-Wind observation of GRB 220219B
  53. GCN Circ.draft on GRB 220222A
  54. GRB 220219B: Swift-XRT observations
  55. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  56. Fermi GRB 220223A: Global MASTER-Net observations report
  57. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  58. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  59. Fermi GRB 220222B: Global MASTER-Net observations report
  60. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  61. GRB 220219B: Swift ToO observations
  62. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  63. Fermi-LAT Gamma-ray Observations of IceCube-220221A
  64. Fermi GRB 220222A: Global MASTER-Net observations report
  65. ZTF22aabjpxh/AT2022cva: Assy optical observations
  66. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  67. ZTF22aaajecb/AT 2022cmc: CAHA 2.2m/CAFOS detection, luminous transient
  68. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  69. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  70. Konus-Wind observation of GRB 220219A
  71. IPN triangulation of GRB 220219A
  72. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  73. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  74. GRB 220219A: AGILE/MCAL detection
  75. GRB 220211A: redshift lower limit estimating
  76. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  77. Konus-Wind detection of GRB 220209A
  78. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  79. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  80. Konus-Wind detection of GRB 220211A
  81. IPN triangulation of GRB 220209A
  82. ZTF22aaajecp: GIT optical follow-up observations
  83. GRB 211023A: evidence of supernova in LBT spectra
  84. ZTF22aaajecp/AT2022cmc: GMOS-N spectroscopy
  85. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  86. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  87. ZTF22aaajecp/AT2022cmc: VLA radio detection
  88. GRB 220211A: Fermi GBM observation
  89. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  90. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  91. IPN triangulation of GRB 220211A (short)
  92. GRB 220210A: Insight-HXMT/HE detection
  93. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  94. GRB 220210A: Fermi GBM detection
  95. Fermi GRB 220211B: Global MASTER-Net observations report
  96. GRB 220209A: Fermi-LAT detection
  97. GRB 220210A: Fermi-LAT detection
  98. GRB 220210A: AGILE detection
  99. GRB 220210A: Swift/BAT-GUANO localization
  100. Fermi GRB 220211A: Global MASTER-Net observations report

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