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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"

24582 results found.

  1. GRB 230124A: Swift/BAT-GUANO detection outside the coded FOV
  2. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  3. GRB 230114B: Detection by VZLUSAT-2
  4. GRB 230123A: LCOGT Optical Upper Limits
  5. Fermi GRB 230124A: Global MASTER-Net observations report
  6. GRB 230124A: Fermi GBM Final Real-time Localization
  7. GRB 230123A: Swift-BAT refined analysis
  8. GRB 230122A: Swift/BAT-GUANO detection
  9. Fermi-LAT gamma-ray observations of IceCube-230122A
  10. GRB 230116C: Swift-XRT observations
  11. GRB 230123A: Swift detection of a burst
  12. IceCube Alert 230122.16: Global MASTER-Net observations report
  13. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  14. GRB 230116B: Fermi GBM observation
  15. IPN triangulation of GRB 230116B (short)
  16. GRB 230119A: CALET Gamma-Ray Burst Monitor detection
  17. GRB 230116D: 3.6m DOT optical upper limit
  18. GRB 230119A: Fermi GBM Final Real-time Localization
  19. Fermi GRB 230118A: Global MASTER-Net observations report
  20. GRB 230118A: Fermi GBM Final Real-time Localization
  21. GRB 230116D: Swift-BAT refined analysis
  22. GRB 230116C: Swift-BAT refined analysis
  23. GRB 230116D: LCOGT Optical Upper Limit
  24. Fermi trigger No 695569700: Global MASTER-Net observations report
  25. Fermi GRB 230117A: Global MASTER-Net observations report
  26. GRB 230117A: Fermi GBM Final Real-time Localization
  27. Swift GRB230116.88: Global MASTER-Net observations report
  28. IceCube-230112A: No Candidate Counterparts from the Zwicky Transient Facility
  29. GRB 230116C: Swift detection of a burst
  30. GRB 230116B: Fermi GBM Final Real-time Localization
  31. GRB 230116A: Fermi GBM Final Real-time Localization
  32. GRB 230114A: Detection by VZLUSAT-2
  33. Fermi-LAT gamma-ray observations of IceCube-230112A
  34. GRB 230114A: Fermi GBM Final Real-time Localization
  35. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-230109A
  36. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A
  37. IceCube-230112A: Upper limits from a search for additional neutrino events in IceCube
  38. IceCube-230112A: BOOTES-4/MET Optical Upper Limit
  39. GRB 230111A: Fermi GBM Observation
  40. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  41. Fermi GRB 230112A: Global MASTER-Net observations report
  42. IceCube Alert 230112.28: Global MASTER-Net observations report
  43. GRB 230112A: Fermi GBM Final Real-time Localization
  44. GRB 230111A: Fermi GBM Final Real-time Localization
  45. GRB 230106: AstroSat LAXPC detection
  46. IceCube-Cascade 230109A: Upper limits from a search for additional neutrino events in IceCube
  47. Fermi trigger No 695057654: Global MASTER-Net observations report
  48. GRB 230102A: Fermi GBM Observation
  49. GRB 221231A: 3.6m DOT optical upper limit
  50. GRB 230102A: Swift/BAT-GUANO detection outside the coded FOV
  51. GRB 221231A: Fermi GBM Observation
  52. GRB 230102A: Detection by GRBAlpha
  53. Fermi trigger No 694259491: Global MASTER-Net observations report
  54. GRB 230102A: AGILE/MCAL detection
  55. GRB 230102A: Fermi GBM Final Real-time Localization
  56. GRB 221231A: AKO Upper Limit
  57. GRB 221231A: Swift-XRT observations
  58. IceCube-221223A: No Candidate Counterparts from the Zwicky Transient Facility
  59. GRB 221231A: Swift/BAT-GUANO arcminute localization of a possibly short burst
  60. Fermi trigger No 694232203: Global MASTER-Net observations report
  61. GRB 230101A: Fermi GBM Final Real-time Localization
  62. GRB 221231A: Fermi GBM Final Real-time Localization
  63. Subject: IceCube-Cascade 221229A: Upper limits from a search for additional neutrino events in IceCube
  64. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  65. Fermi-LAT gamma-ray observations of IceCube-221229A
  66. GRB 221226A: Fermi GBM detection
  67. IceCube-221229A: BOOTES-2/TELMA Optical Upper Limit
  68. IPN triangulation of GRB 221226A
  69. IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event
  70. GRB 221226A: Swift/BAT-GUANO detection outside the coded FOV
  71. ZTF22acaruqr/AT2022adzb: Neil Gehrels Swift Observatory X-ray detection
  72. GRB 221226B: LCOGT Optical Upper Limits
  73. IceCube-221224A: Upper limits from a search for additional neutrino events in IceCube
  74. IceCube-221223A: Upper limits from a search for additional neutrino events in IceCube
  75. GRB 221228A: Fermi GBM Final Real-time Localization
  76. GRB 221226B Swift-BAT refined analysis
  77. GRB 221226B: Fermi GBM Observation
  78. GRB 221226B: Fermi GBM Final Real-time Localization
  79. Swift GRB221226.95: Global MASTER-Net observations report
  80. Fermi GRB 221226A: Global MASTER-Net observations report
  81. GRB 221226A: Fermi GBM Final Real-time Localization
  82. Fermi-LAT gamma-ray observations of IceCube-221224A
  83. IceCube-221224A: BOOTES-4/MET Optical Upper Limit
  84. IceCube-221223A: BOOTES-4/MET Optical Observations
  85. Fermi-LAT gamma-ray observations of IceCube-221223A
  86. Fermi GRB 221223A: Global MASTER-Net observations report
  87. IceCube Alert 221224.04: Global MASTER-Net observations report
  88. IceCube-221224A - IceCube observation of a high-energy neutrino candidate track-like event
  89. GRB 221223A: Fermi GBM Final Real-time Localization
  90. IceCube Alert 221223.32: Global MASTER-Net observations report
  91. IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event
  92. Fermi GRB 221221A: Global MASTER-Net observations report
  93. GRB 221221A: Fermi GBM Final Real-time Localization
  94. GRB 221218A: 3.6m DOT optical upper limit
  95. IceCube-221216A: No Candidate Counterparts from the Zwicky Transient Facility
  96. GRB 221216A: Detection by VZLUSAT-2
  97. GRB 221218A: MITSuME Akeno optical upper limits
  98. IceCube-221210A: BOOTES-4/MET and Lijiang 2.4-meter Telescopes Optical Observations
  99. GRB 221215A: Fermi GBM Detection
  100. GRB 221218A: a long GRB detected by INTEGRAL

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