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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"

24619 results found.

  1. Swift GRB 210905A: Global MASTER-Net observations report
  2. Fermi GRB 210904A: Global MASTER-Net observations report
  3. GRB 210904A: Fermi GBM Final Real-time Localization
  4. Swift GRB210903.59: Global MASTER-Net observations report
  5. Swift GRB210903.58: Global MASTER-Net observations report
  6. Swift GRB210903.58: Global MASTER-Net observations report
  7. Fermi GRB 210903A: Global MASTER-Net observations report
  8. GRB 210903C: Fermi GBM Final Real-time Localization
  9. Fermi GRB 210903B: Global MASTER-Net observations report
  10. GRB 210901A: GROND observations
  11. GRB 210903B: Fermi GBM Final Localization
  12. Fermi GBM observation of a burst from SGR J1555.2-5402
  13. GRB 210903A: Fermi GBM Final Real-time Localization
  14. GRB 210901A: Swift-BAT refined analysis
  15. GRB 210901A: LCO Optical Upper Limit
  16. Swift GRB 210901A: Global MASTER-Net observations report
  17. Integral GRB210829.17: Global MASTER-Net observations report
  18. Integral GRB210829.14: Global MASTER-Net observations report
  19. GRB 210827A: Fermi GBM Observation
  20. Fermi GRB 210827A: Global MASTER-Net observations report
  21. Fermi GRB 210827B: Global MASTER-Net observations report
  22. GRB 210827A: Swift-XRT observations
  23. GRB 210827A: Swift/BAT-GUANO detection and arcminute localization
  24. POLAR detection of a SGR-like burst
  25. GRB 210827B: BALROG localization (Fermi Trigger 651751821 / GRB 210827424)
  26. GRB 210827B: Fermi GBM Final Real-time Localization
  27. GRB 210826A: Swift-XRT observations
  28. GRB 210827A: Fermi GBM Final Real-time Localization
  29. GRB 210824A: Swift-BAT refined analysis
  30. GRB 210826A: Fermi-LAT detection
  31. Fermi GRB 210826A: Global MASTER-Net observations report
  32. GRB 210824A: MITSuME Akeno optical upper limits
  33. GRB 210826A: BALROG localization (Fermi Trigger 651654110 / GRB 210826293)
  34. GRB 210826A: Fermi GBM Final Real-time Localization
  35. Swift GRB210825.29: Global MASTER-Net observations report
  36. Swift detection of an outburst from SGR Swift J1555.2-5402
  37. Swift GRB 210824A: Global MASTER-Net observations report
  38. GRB 210824A: Fermi GBM Observation
  39. Fermi GRB 210824A: Global MASTER-Net observations report
  40. GRB 210824A: Swift-XRT refined Analysis
  41. GRB 210822A: GROND observations
  42. GRB 210822A: Abbey Ridge Observatory optical afterglow observation
  43. GRB 210824A: Fermi GBM Final Real-time Localization
  44. GRB 210822A: GECAM refined analysis
  45. Konus-Wind detection of GRB 210822A
  46. Fermi trigger No 651306769: Global MASTER-Net observations report
  47. GRB 210822A: Swift-BAT refined analysis
  48. GRB 210820A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  49. GRB 210822A: Fermi-LAT detection
  50. Fermi GRB 210822B: Global MASTER-Net observations report
  51. GRB 210822B: Fermi GBM Final Real-time Localization
  52. Swift GRB 210822A: Global MASTER-Net observations report
  53. GRB 210822A: KAIT Optical Afterglow Confirmation
  54. GRB 210822A: GECAM detection
  55. Fermi GRB 210821A: Global MASTER-Net observations report
  56. GRB 210820A: Swift-BAT refined analysis
  57. GRB 210820A: LCO Optical Upper Limit
  58. GRB 210821A: Fermi GBM Final Real-time Localization
  59. GRB 210820A: Swift-XRT refined Analysis
  60. Swift GRB 210820A: Global MASTER-Net observations report
  61. GRB 210820B: Fermi GBM Final Localization
  62. Fermi trigger No 651110719: Global MASTER-Net observations report
  63. Swift GRB210818.68: Global MASTER-Net observations report
  64. Swift GRB 210818A: Global MASTER-Net observations report
  65. GRB 210818A: Swift-BAT refined analysis
  66. Konus-Wind detection of GRB 210818A
  67. Swift Trigger 1069242 is Cyg X-1
  68. GRB 210818A: AGILE detection
  69. IceCube-210811A: Upper limits from a search for additional neutrino events in IceCube
  70. IceCube-210730A: not observable by Fermi-GBM
  71. IceCube-210811A: Upper limits from Fermi-GBM Observations
  72. GRB 210815A: BALROG localization (Fermi Trigger 650687034 / GRB 210815100)
  73. GRB 210815A: Fermi GBM Final Real-time Localization
  74. Fermi trigger No 650687034: Global MASTER-Net observations report
  75. GRB 210812A is consistent with being a lensed GRB
  76. IceCube-210811A: No Candidate Counterparts from the Zwicky Transient Facility
  77. GRB 210712A: Fermi GBM observation
  78. GRB 210813A: BALROG localization (Fermi Trigger 650508868 / GRB 210813038)
  79. Fermi GRB 210813A: Global MASTER-Net observations report
  80. GRB 210813A: Fermi GBM Final Real-time Localization
  81. Fermi-LAT Gamma-ray Observations of IceCube-210811A
  82. Retraction of Fermi GBM GCN 30630 and GCN 30632
  83. Fermi GRB 210812A: Global MASTER-Net observations report
  84. GRB 210812B: Fermi GBM Final Real-time Localization
  85. GRB 210812A: BALROG localization (Fermi Trigger 650479626 / GRB 210812699)
  86. GRB 210812A: Fermi GBM Final Real-time Localization
  87. GRB 080102A: Fermi GBM Final Real-time Localization
  88. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  89. GRB 080101A: Fermi GBM Final Real-time Localization
  90. IceCube-210811A - IceCube observation of a high-energy neutrino candidate track-like event
  91. IceCube Alert 210811.09: Global MASTER-Net observations report
  92. GRB 210807C: Swift-BAT refined analysis
  93. GRB 210807A: Detection by GRBAlpha
  94. GRB 210807A: Swift-BAT refined analysis
  95. GRB 210807C: Fermi GBM detection
  96. Swift GRB210807.74: Global MASTER-Net observations report
  97. Fermi GRB 210807C: Global MASTER-Net observations report
  98. Swift GRB210807.96: Global MASTER-Net observations report
  99. GRB 210807C: Swift detection of a burst
  100. GRB 210807C: Fermi GBM Final Real-time Localization

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