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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"

27334 results found.

  1. GRB 221226B Swift-BAT refined analysis
  2. GRB 221226B: Swift-UVOT Detection
  3. GRB 221226B: Fermi GBM Observation
  4. GRB 221226B: Swift-XRT refined Analysis
  5. GRB 221226B: VLT/X-shooter redshift and host galaxy
  6. GRB 221226B: Swift detection of a burst
  7. GRB 221226B: Fermi GBM Final Real-time Localization
  8. Swift GRB221226.95: Global MASTER-Net observations report
  9. Fermi GRB 221226A: Global MASTER-Net observations report
  10. GRB 221226A: Fermi GBM Final Real-time Localization
  11. Fermi GRB 221223A: Global MASTER-Net observations report
  12. IceCube Alert 221224.04: Global MASTER-Net observations report
  13. GRB 221223A: Fermi GBM Final Real-time Localization
  14. IceCube Alert 221223.32: Global MASTER-Net observations report
  15. Fermi GRB 221221A: Global MASTER-Net observations report
  16. GRB 221221A: Fermi GBM Final Real-time Localization
  17. GRB 221216A: Detection by VZLUSAT-2
  18. GRB 221218A: MITSuME Akeno optical upper limits
  19. GRB 221215A: Fermi GBM Detection
  20. Integral GRB221218.34: Global MASTER-Net observations report
  21. GRB 221216A: Swift/UVOT Upper Limits
  22. GRB 221216A: Fermi GBM observation
  23. GRB 221216A: Swift-XRT refined Analysis
  24. IceCube Alert 221216.25: Global MASTER-Net observations report
  25. GRB 221216A: AKO Upper Limit
  26. Swift GRB 221216A: Global MASTER-Net observations report
  27. GRB 221216A: Zadko observatory - Gingin optical observations
  28. GRB 221216A: Nanshan/NEXT optical upper limits
  29. GRB 221216A: Swift detection of a burst
  30. GRB 221216A: Fermi GBM Final Real-time Localization
  31. Fermi trigger No 692760884: Global MASTER-Net observations report
  32. GRB 221215A: Swift/BAT-GUANO arcminute localization
  33. Fermi GRB 221215B: Global MASTER-Net observations report
  34. IPN triangulation of GRB 221209A (long)
  35. GRB 221215B: Fermi GBM Final Real-time Localization
  36. Fermi Gamma-ray Burst Monitor trigger 692760884/221215066 is not a GRB
  37. Swift GRB221215.15: Global MASTER-Net observations report
  38. Fermi trigger No 692713692: Global MASTER-Net observations report
  39. GRB 221215A: Fermi GBM Final Real-time Localization
  40. Swift Trigger 1144538 is not a GRB
  41. Fermi Gamma-ray Burst Monitor triggers 692721536/221214610 and 692713692/221214520 are not GRBs
  42. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  43. Fermi trigger No 692607435: Global MASTER-Net observations report
  44. GRB 221209A: CALET Gamma-Ray Burst Monitor detection
  45. GRB 221212A: Fermi GBM Final Real-time Localization
  46. Fermi GRB 221211A: Global MASTER-Net observations report
  47. GRB 221211A: Fermi GBM Final Real-time Localization
  48. IceCube Alert 221210.36: Global MASTER-Net observations report
  49. GRB 221009A: MuSCAT3 observations
  50. GRB 221210A: Fermi GBM Final Real-time Localization
  51. GRB 221209B: Fermi GBM Final Real-time Localization
  52. GRB 221209A: Fermi GBM observation
  53. GRB 221209A: BALROG localization (Fermi Trigger 692257829 / GRB 221209243)
  54. GRB 221209A: Fermi GBM Final Real-time Localization
  55. GRB 221206B: Fermi GBM observation
  56. GRB 221206B: Detection by GRBAlpha
  57. GRB 221206B: Swift/BAT-GUANO candidate arcminute localization
  58. Swift/BAT trigger #1143281 is not a GRB
  59. GRB 221206C: Fermi GBM Final Real-time Localization
  60. GRB 221206B: Fermi GBM Final Real-time Localization
  61. GRB 221206A: Fermi GBM Final Real-time Localization
  62. GRB 221205A: Fermi GBM Final Real-time Localization
  63. Swift GRB221204.45 AKO Upper Limit
  64. GRB 221202B: Detection by VZLUSAT-2
  65. Swift GRB221204.45: Global MASTER-Net observations report
  66. GRB 221203B: Fermi GBM Final Real-time Localization
  67. GRB 221202A: Swift/UVOT Detection
  68. GRB 221202A: Swift-BAT refined analysis
  69. GRB 221201A: Swift-BAT refined analysis
  70. GRB 221203A: Fermi GBM Final Real-time Localization
  71. GRB 221201A: Fermi GBM observation
  72. GRB 221202A: Swift-XRT refined Analysis
  73. GRB 221202A: LCOGT Optical Upper Limits
  74. GRB 221202A: MeerLICHT upper limits
  75. GRB 221202B: Fermi GBM Final Real-time Localization
  76. GRB 221202A: Swift detection of a burst
  77. Swift GRB221202.84: Global MASTER-Net observations report
  78. GCN: GRB 221201A: Swift/UVOT Upper Limits
  79. GRB 221201A: Swift-XRT refined Analysis
  80. Swift GRB 221201A: Global MASTER-Net observations report
  81. GRB 221201A: Swift detection of a burst
  82. GRB 221201A: Fermi GBM Final Real-time Localization
  83. Fermi Gamma-ray Burst Monitor trigger 691534074/221130867 is not a GRB
  84. Optical polarization observation of GRB 221009A
  85. GRB 221126A: Fermi GBM observation
  86. GRB 221127A: Detection by GRBAlpha
  87. Alert from the HAWC Burst Monitor HAWC-221128A
  88. GRB 221126A: Swift/BAT-GUANO detection outside the coded FOV
  89. GRB 221126A: Fermi GBM Final Real-time Localization
  90. GRB 221124A: Swift/BAT-GUANO detection
  91. GRB 221124A: CALET Gamma-Ray Burst Monitor detection
  92. IceCube Alert 221124.66: Global MASTER-Net observations report
  93. GRB 221120A: TURBO Optical Upper Limit
  94. GRB 221122A: Detection by GRBAlpha
  95. Alert from the HAWC Burst Monitor HAWC-221123A
  96. GRB 221121A: CALET Gamma-Ray Burst Monitor detection
  97. GRB 221009A：DAMPE observed a 34.7 GeV photon at 1.36 hour after the GBM trigger
  98. IPN triangulation of GRB 221121A (long)
  99. GRB 221120A: Swift-BAT refined analysis
  100. GRB 221120A: AKO Telescope Upper Limits

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