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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"

28278 results found.

  1. GRB 220527A: Swift ToO observations
  2. GRB 220527A: Fermi-LAT detection
  3. GRB 220527A: Fermi GBM Final Localization
  4. GRB 220527A: AGILE detection
  5. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  6. GRB 220525A: Fermi GBM Detection
  7. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  8. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  10. Konus-Wind detection of GRB 220524B
  11. Konus-Wind detection of GRB 220525A
  12. Konus-Wind detection of GRB 220524A
  13. IPN triangulation of GRB 220525A
  14. GRB 220525A: Fermi GBM Final Real-time Localization
  15. GRB 220521A: ATCA detection
  16. GRB 220521A: ALMA detection
  17. Konus-Wind detection of GRB 220522B
  18. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  19. Konus-Wind detection of GRB 220521B
  20. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  21. GRB 220521A: ISON-Castelgrande observatory optical observations
  22. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  23. GRB 220521A: MITSuME Akeno optical upper limits
  24. GRB 220521A: Gemini Observations
  25. GRB 220523B: Fermi GBM detection
  26. GRB 220521A: MMT Afterglow Imaging
  27. GRB 220521A: REM optical/NIR upper limits
  28. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  29. GRB 220523A: Fermi GBM Final Real-time Localization
  30. GRB 220521A: LCO Optical Detection
  31. GRB 220521A: Fermi GBM detection
  32. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  33. GRB 220521A: RATIR Optical and NIR Observations
  34. GRB 220521A: Swift-XRT refined Analysis
  35. GRB 220521A: Swift/UVOT Upper Limits
  36. GRB 220521A: Enhanced Swift-XRT position
  37. GRB 220522A: Fermi GBM Final Real-time Localization
  38. GRB 220521A: NOT optical afterglow detection
  39. GRB 220521A: Prompt enhanced Swift-XRT position
  40. GRB 220521A: Swift detection of a burst
  41. GRB 220521A: Fermi GBM Final Real-time Localization
  42. Konus-Wind detection of GRB 220519A
  43. GRB 220514A: AstroSat CZTI detection
  44. GRB 220518A: Swift-XRT refined Analysis
  45. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  46. GRB 220518B: Fermi GBM Final Real-time Localization
  47. GRB 220518A: Swift/UVOT Detection
  48. GRB 220518A: Enhanced Swift-XRT position
  49. GRB 220518A: Swift detection of a burst
  50. GRB 220514A: MITSuME Akeno optical observation
  51. GRB 220514A: GRANDMA Optical Afterglow Observations
  52. Konus-Wind detection of GRB 220506A
  53. Konus-Wind detection of GRB 220514B
  54. GRB 220514B: Swift-XRT observations
  55. GRB 220511A: Swift-XRT afterglow detection
  56. GRB 220514A: KAIT Optical Afterglow Confirmation
  57. GRB 220514B: Tiled Swift observations
  58. IceCube-220513A: No significant detection in HAWC
  59. GRB 220514B: MAXI/GSC detection
  60. GRB 220514A: MeerLICHT optical afterglow candidate
  61. GRB 220514A: Fermi GBM Final Real-time Localization
  62. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  63. GRB 220513A: Fermi GBM Final Real-time Localization
  64. Konus-Wind detection of GRB 220511A
  65. GRB 220427A: MeerLICHT afterglow observations
  66. IceCube-220509A: No significant detection in HAWC
  67. GRB 220511A: Swift-XRT observations
  68. GRB 220511A: AstroSat CZTI detection
  69. GRB 220511A: BOOTES-2/TELMA optical upper limit
  70. GRB 220512A: Fermi GBM Final Real-time Localization
  71. GRB 220511A: Swift ToO observations
  72. GRB 220511A: Swift/BAT-GUANO arcminute localization
  73. GRB 220511A: AGILE detection
  74. GRB 220511A: Fermi GBM Final Real-time Localization
  75. GRB 220507A: AstroSat CZTI detection
  76. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  77. GRB 220506A: MITSuME Akeno optical upper limits
  78. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 220508A: Fermi GBM Final Real-time Localization
  80. GRB 220507A: Fermi GBM Final Localization
  81. GRB 220506A: BOOTES-5/JGT optical upper limit
  82. GRB 220506A: Swift-XRT afterglow detection
  83. GRB 220506A: Tiled Swift observations
  84. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  85. GRB 220430A: Nanshan/NEXT optical upper limit
  86. GRB 220430A: Nanshan/HMT optical upper limit
  87. IPN triangulation of GRB 220423A
  88. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  89. GRB 220501A: BOOTES-1 optical upper limit
  90. GRB 220430A: AstroSat CZTI detection
  91. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  92. GRB 220501A: Fermi GBM Final Real-time Localization
  93. GRB 220501A: Swift detection of a burst
  94. GRB 220430A: CAHA 2.2m telescope optical limit
  95. GRB 220430A: Swift-XRT refined Analysis
  96. GRB 220430A: GRANDMA observations
  97. GRB 220430A: Mondy and AbAO optical upper limits
  98. GRB 220430A: AGILE detection
  99. GRB 220430A: MeerLICHT optical upper limits
  100. GRB 220430A: Enhanced Swift-XRT position

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