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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"

27839 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. Swift trigger 1108208 is not an interesting astrophysical event.
  9. GRB 220527A: Swift ToO observations
  10. GRB 220527A: Fermi-LAT detection
  11. GRB 220527A: Fermi GBM Final Localization
  12. GRB 220527A: AGILE detection
  13. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  14. GRB 220525A: Fermi GBM Detection
  15. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  16. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  17. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  18. Konus-Wind detection of GRB 220524B
  19. Konus-Wind detection of GRB 220525A
  20. Konus-Wind detection of GRB 220524A
  21. Swift GRB220526.48: Global MASTER-Net observations report
  22. IPN triangulation of GRB 220525A
  23. IPN triangulation of GRB 220524A
  24. GRB 220525A: Fermi GBM Final Real-time Localization
  25. GRB 220521A: ATCA detection
  26. GRB 220521A: ALMA detection
  27. Konus-Wind detection of GRB 220522B
  28. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  29. Konus-Wind detection of GRB 220521B
  30. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  31. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  32. GRB 220521A: Gemini Observations
  33. GRB 220523B: Fermi GBM detection
  34. GRB 220521A: MMT Afterglow Imaging
  35. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  36. GRB 220523A: Fermi GBM Final Real-time Localization
  37. GRB 220521A: LCO Optical Detection
  38. GRB 220521A: Swift-BAT refined analysis
  39. GRB 220521A: Fermi GBM detection
  40. GRB 220521A: RATIR Optical and NIR Observations
  41. GRB 220521A: Swift-XRT refined Analysis
  42. GRB 220521A: Swift/UVOT Upper Limits
  43. GRB 220521A: Enhanced Swift-XRT position
  44. GRB 220522A: Fermi GBM Final Real-time Localization
  45. GRB 220521A: NOT optical afterglow detection
  46. GRB 220521A: Prompt enhanced Swift-XRT position
  47. GRB 220521A: Swift detection of a burst
  48. GRB 220521A: Fermi GBM Final Real-time Localization
  49. Swift GRB220521.97: Global MASTER-Net observations report
  50. Konus-Wind detection of GRB 220519A
  51. Swift BAT Trigger 1107209 is not an astrophysical event
  52. GRB 220514A: AstroSat CZTI detection
  53. GRB 220518A: Swift-BAT refined analysis
  54. Swift GRB220519.84: Global MASTER-Net observations report
  55. GRB 220518A: Swift-XRT refined Analysis
  56. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  57. GRB 220518B: Fermi GBM Final Real-time Localization
  58. GRB 220518A: Swift/UVOT Detection
  59. GRB 220518A: Enhanced Swift-XRT position
  60. Swift GRB 220518A: Global MASTER-Net observations report
  61. GRB 220518A: Swift detection of a burst
  62. Konus-Wind detection of GRB 220506A
  63. Konus-Wind detection of GRB 220514B
  64. GRB 220514B: Swift-XRT observations
  65. GRB 220511A: Swift-XRT afterglow detection
  66. GRB 220514B: Tiled Swift observations
  67. IceCube-220513A: No significant detection in HAWC
  68. GRB 220514B: MAXI/GSC detection
  69. GRB 220514A: MeerLICHT optical afterglow candidate
  70. GRB 220514A: Fermi GBM Final Real-time Localization
  71. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  72. GRB 220513A: Fermi GBM Final Real-time Localization
  73. Konus-Wind detection of GRB 220511A
  74. GRB 220427A: MeerLICHT afterglow observations
  75. IceCube-220509A: No significant detection in HAWC
  76. GRB 220511A: Fermi GBM observation
  77. GRB 220511A: Swift-XRT observations
  78. GRB 220511A: AstroSat CZTI detection
  79. GRB 220511A: BOOTES-2/TELMA optical upper limit
  80. GRB 220512A: Fermi GBM Final Real-time Localization
  81. GRB 220511A: Swift ToO observations
  82. GRB 220511A: Swift/BAT-GUANO arcminute localization
  83. GRB 220511A: AGILE detection
  84. GRB 220511A: Fermi GBM Final Real-time Localization
  85. GRB 220507A: AstroSat CZTI detection
  86. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  87. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  88. GRB 220506A: GIT optical upper limit.
  89. GRB 220508A: Fermi GBM Final Real-time Localization
  90. GRB 220507A: Fermi GBM Final Localization
  91. GRB 220506A: BOOTES-5/JGT optical upper limit
  92. GRB 220506A: Swift-XRT afterglow detection
  93. GRB 220506A: Tiled Swift observations
  94. Swift-BAT triggers 1105560-1 are not GRBs
  95. Swift GRB220506.51: Global MASTER-Net observations report
  96. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  97. GRB 220430A: Nanshan/NEXT optical upper limit
  98. GRB 220430A: Nanshan/HMT optical upper limit
  99. GRB 220430A: GIT optical upper limits
  100. IPN triangulation of GRB 220423A

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