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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"

24581 results found.

  1. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  2. GRB 230114B: Detection by VZLUSAT-2
  3. GRB 230123A: LCOGT Optical Upper Limits
  4. Fermi GRB 230124A: Global MASTER-Net observations report
  5. GRB 230124A: Fermi GBM Final Real-time Localization
  6. GRB 230123A: Swift-BAT refined analysis
  7. GRB 230122A: Swift/BAT-GUANO detection
  8. Fermi-LAT gamma-ray observations of IceCube-230122A
  9. GRB 230116C: Swift-XRT observations
  10. GRB 230123A: Swift detection of a burst
  11. IceCube Alert 230122.16: Global MASTER-Net observations report
  12. IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event
  13. GRB 230116B: Fermi GBM observation
  14. IPN triangulation of GRB 230116B (short)
  15. GRB 230119A: CALET Gamma-Ray Burst Monitor detection
  16. GRB 230116D: 3.6m DOT optical upper limit
  17. GRB 230119A: Fermi GBM Final Real-time Localization
  18. Fermi GRB 230118A: Global MASTER-Net observations report
  19. GRB 230118A: Fermi GBM Final Real-time Localization
  20. GRB 230116D: Swift-BAT refined analysis
  21. GRB 230116C: Swift-BAT refined analysis
  22. GRB 230116D: LCOGT Optical Upper Limit
  23. Fermi trigger No 695569700: Global MASTER-Net observations report
  24. Fermi GRB 230117A: Global MASTER-Net observations report
  25. GRB 230117A: Fermi GBM Final Real-time Localization
  26. Swift GRB230116.88: Global MASTER-Net observations report
  27. IceCube-230112A: No Candidate Counterparts from the Zwicky Transient Facility
  28. GRB 230116C: Swift detection of a burst
  29. GRB 230116B: Fermi GBM Final Real-time Localization
  30. GRB 230116A: Fermi GBM Final Real-time Localization
  31. GRB 230114A: Detection by VZLUSAT-2
  32. Fermi-LAT gamma-ray observations of IceCube-230112A
  33. GRB 230114A: Fermi GBM Final Real-time Localization
  34. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-230109A
  35. Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A
  36. IceCube-230112A: Upper limits from a search for additional neutrino events in IceCube
  37. IceCube-230112A: BOOTES-4/MET Optical Upper Limit
  38. GRB 230111A: Fermi GBM Observation
  39. IceCube-230112A - IceCube observation of a high-energy neutrino candidate track-like event
  40. Fermi GRB 230112A: Global MASTER-Net observations report
  41. IceCube Alert 230112.28: Global MASTER-Net observations report
  42. GRB 230112A: Fermi GBM Final Real-time Localization
  43. GRB 230111A: Fermi GBM Final Real-time Localization
  44. GRB 230106: AstroSat LAXPC detection
  45. IceCube-Cascade 230109A: Upper limits from a search for additional neutrino events in IceCube
  46. Fermi trigger No 695057654: Global MASTER-Net observations report
  47. GRB 230102A: Fermi GBM Observation
  48. GRB 221231A: 3.6m DOT optical upper limit
  49. GRB 230102A: Swift/BAT-GUANO detection outside the coded FOV
  50. GRB 221231A: Fermi GBM Observation
  51. GRB 230102A: Detection by GRBAlpha
  52. Fermi trigger No 694259491: Global MASTER-Net observations report
  53. GRB 230102A: AGILE/MCAL detection
  54. GRB 230102A: Fermi GBM Final Real-time Localization
  55. GRB 221231A: AKO Upper Limit
  56. GRB 221231A: Swift-XRT observations
  57. IceCube-221223A: No Candidate Counterparts from the Zwicky Transient Facility
  58. GRB 221231A: Swift/BAT-GUANO arcminute localization of a possibly short burst
  59. Fermi trigger No 694232203: Global MASTER-Net observations report
  60. GRB 230101A: Fermi GBM Final Real-time Localization
  61. GRB 221231A: Fermi GBM Final Real-time Localization
  62. Subject: IceCube-Cascade 221229A: Upper limits from a search for additional neutrino events in IceCube
  63. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  64. Fermi-LAT gamma-ray observations of IceCube-221229A
  65. GRB 221226A: Fermi GBM detection
  66. IceCube-221229A: BOOTES-2/TELMA Optical Upper Limit
  67. IPN triangulation of GRB 221226A
  68. IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event
  69. GRB 221226A: Swift/BAT-GUANO detection outside the coded FOV
  70. ZTF22acaruqr/AT2022adzb: Neil Gehrels Swift Observatory X-ray detection
  71. GRB 221226B: LCOGT Optical Upper Limits
  72. IceCube-221224A: Upper limits from a search for additional neutrino events in IceCube
  73. IceCube-221223A: Upper limits from a search for additional neutrino events in IceCube
  74. GRB 221228A: Fermi GBM Final Real-time Localization
  75. GRB 221226B Swift-BAT refined analysis
  76. GRB 221226B: Fermi GBM Observation
  77. GRB 221226B: Fermi GBM Final Real-time Localization
  78. Swift GRB221226.95: Global MASTER-Net observations report
  79. Fermi GRB 221226A: Global MASTER-Net observations report
  80. GRB 221226A: Fermi GBM Final Real-time Localization
  81. Fermi-LAT gamma-ray observations of IceCube-221224A
  82. IceCube-221224A: BOOTES-4/MET Optical Upper Limit
  83. IceCube-221223A: BOOTES-4/MET Optical Observations
  84. Fermi-LAT gamma-ray observations of IceCube-221223A
  85. Fermi GRB 221223A: Global MASTER-Net observations report
  86. IceCube Alert 221224.04: Global MASTER-Net observations report
  87. IceCube-221224A - IceCube observation of a high-energy neutrino candidate track-like event
  88. GRB 221223A: Fermi GBM Final Real-time Localization
  89. IceCube Alert 221223.32: Global MASTER-Net observations report
  90. IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event
  91. Fermi GRB 221221A: Global MASTER-Net observations report
  92. GRB 221221A: Fermi GBM Final Real-time Localization
  93. GRB 221218A: 3.6m DOT optical upper limit
  94. IceCube-221216A: No Candidate Counterparts from the Zwicky Transient Facility
  95. GRB 221216A: Detection by VZLUSAT-2
  96. GRB 221218A: MITSuME Akeno optical upper limits
  97. IceCube-221210A: BOOTES-4/MET and Lijiang 2.4-meter Telescopes Optical Observations
  98. GRB 221215A: Fermi GBM Detection
  99. GRB 221218A: a long GRB detected by INTEGRAL
  100. Integral GRB221218.34: Global MASTER-Net observations report

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