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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"

32762 results found.

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

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