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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"

14967 results found.

  1. GRB 220527A: VLT/X-shooter spectroscopic redshift
  2. GRB 220527A: MeerLICHT afterglow observations
  3. GRB 220527A: AstroSat CZTI detection
  4. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 220527A: MITSuME Akeno optical observation
  6. GRB 220527A: Swift/UVOT detection
  7. GRB 220527A: Swift-XRT afterglow detection
  8. GRB 220527A: Fermi-LAT detection
  9. GRB 220527A: Fermi GBM Final Localization
  10. GRB 220527A: AGILE detection
  11. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  12. GRB 220525A: Fermi GBM Detection
  13. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  14. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  15. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  16. Konus-Wind detection of GRB 220524B
  17. Konus-Wind detection of GRB 220525A
  18. Konus-Wind detection of GRB 220524A
  19. IPN triangulation of GRB 220525A
  20. GRB 220525A: Fermi GBM Final Real-time Localization
  21. GRB 220521A: ATCA detection
  22. GRB 220521A: ALMA detection
  23. Konus-Wind detection of GRB 220522B
  24. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  25. Konus-Wind detection of GRB 220521B
  26. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  27. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  28. GRB 220521A: Gemini Observations
  29. GRB 220523B: Fermi GBM detection
  30. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  31. GRB 220523A: Fermi GBM Final Real-time Localization
  32. GRB 220521A: LCO Optical Detection
  33. GRB 220521A: Fermi GBM detection
  34. GRB 220521A: RATIR Optical and NIR Observations
  35. GRB 220522A: Fermi GBM Final Real-time Localization
  36. GRB 220521A: NOT optical afterglow detection
  37. GRB 220521A: Swift detection of a burst
  38. GRB 220521A: Fermi GBM Final Real-time Localization
  39. Konus-Wind detection of GRB 220519A
  40. GRB 220514A: AstroSat CZTI detection
  41. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  42. GRB 220518B: Fermi GBM Final Real-time Localization
  43. GRB 220518A: Swift/UVOT Detection
  44. GRB 220518A: Swift detection of a burst
  45. Konus-Wind detection of GRB 220506A
  46. Konus-Wind detection of GRB 220514B
  47. GRB 220511A: Swift-XRT afterglow detection
  48. IceCube-220513A: No significant detection in HAWC
  49. GRB 220514B: MAXI/GSC detection
  50. GRB 220514A: MeerLICHT optical afterglow candidate
  51. GRB 220514A: Fermi GBM Final Real-time Localization
  52. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  53. GRB 220513A: Fermi GBM Final Real-time Localization
  54. Konus-Wind detection of GRB 220511A
  55. GRB 220427A: MeerLICHT afterglow observations
  56. IceCube-220509A: No significant detection in HAWC
  57. GRB 220511A: AstroSat CZTI detection
  58. GRB 220511A: BOOTES-2/TELMA optical upper limit
  59. GRB 220512A: Fermi GBM Final Real-time Localization
  60. GRB 220511A: AGILE detection
  61. GRB 220511A: Fermi GBM Final Real-time Localization
  62. GRB 220507A: AstroSat CZTI detection
  63. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  64. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  65. GRB 220508A: Fermi GBM Final Real-time Localization
  66. GRB 220507A: Fermi GBM Final Localization
  67. GRB 220506A: BOOTES-5/JGT optical upper limit
  68. GRB 220506A: Swift-XRT afterglow detection
  69. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  70. IPN triangulation of GRB 220423A
  71. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  72. GRB 220501A: BOOTES-1 optical upper limit
  73. GRB 220430A: AstroSat CZTI detection
  74. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  75. GRB 220501A: Fermi GBM Final Real-time Localization
  76. GRB 220501A: Swift detection of a burst
  77. GRB 220430A: CAHA 2.2m telescope optical limit
  78. GRB 220430A: AGILE detection
  79. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  80. GRB 220423A: Detection by VZLUSAT-2
  81. Konus-Wind detection of GRB 220427A
  82. GRB 220427A: Swift detection of a burst with an optical counterpart
  83. Konus-Wind detection of GRB 220426A
  84. IPN triangulation of GRB 220426A
  85. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  86. GRB 220426A: Fermi GBM detection
  87. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  88. GRB 220426B: Fermi GBM Final Real-time Localization
  89. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  90. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  91. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  93. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  94. On the AGILE detection of GRB 220423A
  95. GRB 220423A: AGILE detection
  96. GRB 220421B: Detection by VZLUSAT-2
  97. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  98. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  99. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  100. GRB 220417A: Fermi GBM detection

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