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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"

14992 results found.

  1. Konus-Wind detection of GRB 201221D (short)
  2. GRB 201222B: Fermi GBM Final Real-time Localization
  3. GRB 201221D: FRAM-ORM optical limit
  4. IceCube-201222A: IceCube observation of a high-energy neutrino candidate event
  5. GRB 201222A: Fermi GBM Final Real-time Localization
  6. GRB 201221E: Fermi GBM Final Real-time Localization
  7. GRB 201221D: Swift detection of a bright short burst
  8. correction to GCN 29110 - Fermi GBM Sub-Threshold Detection of GRB 201221A
  9. Fermi GBM Sub-Threshold Detection of GRB 201221A
  10. IceCube-201221A: IceCube observation of a high-energy neutrino candidate event
  11. GRB 201221B: Fermi GBM Final Real-time Localization
  12. GRB 201221A: Swift detection of a burst
  13. Konus-Wind observation of GRB 201218A
  14. GRB 201209A: Mondy optical observations, afterglow confirmation
  15. GRB 201214A: Swift-XRT afterglow detection
  16. IPN triangulation of GRB 201218A
  17. GRB 201218B: Fermi GBM Final Real-time Localization
  18. GRB201216C: No significant detection in HAWC
  19. Konus-Wind detection of GRB 201216C
  20. IceCube-201209A : MAXI/GSC upper limit
  21. GRB 201218A: Fermi GBM Final Real-time Localization
  22. GRB 201217A: Fermi GBM Final Localization
  23. GRB 201216C: VLT X-shooter spectroscopy and potential high redshift of a VHE-emitting GRB
  24. GRB 201216C: MAGIC detection in very high energy gamma rays
  25. GRB 201216C: AstroSat CZTI detection
  26. GRB 201216C: Fermi GBM detection
  27. GRB 201216A: Fermi GBM detection
  28. GRB 201216C: Fermi GBM Final Real-time Localization
  29. GRB 201216C: Swift detection of a burst
  30. GRB 201216A: Swift/BAT-GUANO detection and arcminute localization
  31. GRB 201216B: AGILE detection of a burst
  32. GRB 201216A: Fermi GBM Final Real-time Localization
  33. Chandra observations of GW170817 at ~3.3 years since merger (Full report)
  34. GRB 201209A: Insight-HXMT/HE detection
  35. IceCube-201209A: Upper limits from Insight-HXMT/HE observations
  36. GRB 201215A: Fermi GBM Final Real-time Localization
  37. GRB 201214B: Swift BAT location of short burst
  38. IceCube-201209: No significant detection in HAWC
  39. GRB 201214A: Mates' birthday GRB optical limit from FRAM-ORM
  40. GRB 201214B: Fermi GBM Final Real-time Localization
  41. GRB 201213A: Fermi GBM Final Real-time Localization
  42. GRB 200826A: GMOS-N detected source magnitude (Correction)
  43. GRB 201015A: 5-GHz radio afterglow detection with the EVN
  44. IceCube-201209A: No neutrino counterpart candidates in ANTARES search
  45. IPN triangulation of GRB 201207A
  46. GRB 201208A: Swift-XRT afterglow detection
  47. GRB 201209A: Xinglong-2.16m likely optical afterglow detection
  48. IceCube-201209A: IceCube observation of a high-energy neutrino candidate event
  49. GRB 201209A: AstroSat CZTI detection
  50. GRB 201207A: AGILE detection
  51. IceCube-201130A: Optical and NIR Imaging Follow-up by Kanata Telescope
  52. GRB 201209A: Swift detection of a burst
  53. GRB 201208A: Fermi-LAT detection
  54. GRB 201208A: AstroSat CZTI detection
  55. GRB 201207A: AstroSat CZTI detection
  56. GRB 201208A: Fermi GBM Final Real-time Localization
  57. GRB 201207A: Fermi GBM Final Real-time Localization
  58. GRB 201203A: Swift-XRT afterglow detection
  59. GRB 201203A: KAIT Optical Upper Limit
  60. GRB 201203A: DDOTI Observations
  61. GRB 201203A: Swift detection of a burst
  62. IceCube-201130A: No significant detection in HAWC
  63. GRB201130A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 628407054)
  64. GRB 201201A: Fermi GBM Final Real-time Localization
  65. GRB 201128B: Swift/BAT-GUANO detection and arcminute localization
  66. IceCube-201130A: IceCube observation of a high-energy neutrino candidate event
  67. GRB 201130A: Fermi GBM Final Real-time Localization
  68. GRB 201128A: Swift detection of a burst
  69. GRB 201121A: Insight-HXMT/HE detection
  70. AMON IC_HAWC NuEm-201124A: No Neutrino Counterpart detected with ANTARES
  71. IceCube-201120A in the Cygnus region: No enhanced TeV gamma-ray flux detected by HAWC
  72. GRB 200826A: TNG and LBT constraints on a supernova bump
  73. GRB 201122A: Insight-HXMT/HE detection
  74. IceCube-201114A: DECam observations and candidate optical counterpart
  75. GRB 201015A L-band observations with e-MERLIN
  76. IceCube-201120A: Swift-XRT non-detection of 4FGL J2028.6+4110e
  77. GRB 201015A radio afterglow with e-MERLIN
  78. GRB 201121B: Fermi GBM Final Real-time Localization
  79. GRB 201121A: Fermi GBM Final Real-time Localization
  80. GRB 201120B: Fermi GBM Final Localization
  81. GRB 201120A: Fermi GBM Final Localization
  82. IceCube-201120A: IceCube observation of a high-energy neutrino candidate event
  83. GRB 201116A: CALET Gamma-Ray Burst Monitor detection
  84. Konus-Wind detection of GRB 201116A
  85. Trigger 1007266: Swift detection of 1A 0535+262
  86. GRB 201116A: Swift-XRT afterglow detection
  87. IceCube-201115A: No significant detection in HAWC
  88. IceCube-201114A: No significant detection in HAWC
  89. GRB 201116A: Fermi-LAT detection
  90. IceCube-201115A: No neutrino counterpart candidates in ANTARES search
  91. GRB 201116A: Fermi GBM Final Real-time Localization
  92. Swift XRT observations of the Fermi-LAT source 4FGL J0658.6+0636, positionally consistent with the IceCube high-energy neutrino alert
  93. VLASS identifies possible radio counterparts to IceCube-201115A, including a bright BL Lac candidate
  94. IceCube GCN alert 134701_49508272.amon retraction
  95. IceCube-201114A: No neutrino counterpart candidates in ANTARES search
  96. IceCube-201115A: IceCube observation of a high-energy neutrino candidate event
  97. IceCube-201114A - IceCube observation of a high-energy neutrino candidate event
  98. GRB 201114A: AstroSat CZTI detection
  99. Konus-Wind observation of GRB 201109A
  100. Swift Trigger 1005428: Detection of SGR 1830-0645

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