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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"

24534 results found.

  1. Fermi trigger No 728706420: Global MASTER-Net observations report
  2. GRB 240204A: Swift detection of a burst
  3. IceCube-240204A - IceCube observation of a high-energy neutrino candidate track-like event
  4. GRB 240204A: Fermi GBM Final Real-time Localization
  5. IceCube Alert 240204.38: Global MASTER-Net observations report
  6. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  7. Konus-Wind detection of GRB 240124B
  8. Konus-Wind detection of GRB 240123C
  9. IPN triangulation of GRB 240124B
  10. GRB 240129A: Fermi GBM Observation
  11. IPN triangulation of GRB 240125B (short)
  12. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  13. IPN triangulation of GRB 240125A (short)
  14. GRB 240128A: Swift-XRT observations
  15. GRB 240128A: GRBAlpha detection
  16. GRB 240128A: MAXI/GSC detection
  17. GRB 240125A: GRBAlpha detection
  18. Fermi GRB 240127A: Global MASTER-Net observations report
  19. GRB 240123C: GRBAlpha detection
  20. GRB 240127A: Fermi GBM Final Real-time Localization
  21. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  22. GRB 240125B: Fermi GBM Final Localization
  23. GRB240122A: PRIME near infrared detection
  24. GRB 240123B: Fermi GBM Observation
  25. GRB 240125A (short): Glowbug gamma-ray detection
  26. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  27. GRB 240123A: GRBAlpha detection
  28. IPN triangulation of GRB 240123C (short)
  29. Fermi-LAT gamma-ray observations of IceCube-240123A
  30. GRB 240123A: Swift-BAT refined analysis
  31. IceCube Alert 240123.48: Global MASTER-Net observations report
  32. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  33. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  34. Fermi GRB 240123B: Global MASTER-Net observations report
  35. GRB 240123B: Fermi GBM Final Real-time Localization
  36. GRB 240122B: Glowbug gamma-ray detection
  37. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  38. Swift GRB240123.46: Global MASTER-Net observations report
  39. GRB 240122A: Swift-XRT afterglow detection
  40. GRB 240122A: GOTO optical counterpart candidate
  41. GRB 240122A: MAXI/GSC detection
  42. IPN triangulation of GRB 240119A (short)
  43. GRB 240119A: GECAM detection of a short burst
  44. GRB 240118C: GECAM-B detection of a long burst
  45. GRB 240118A: Mondy optical observations
  46. GRB 240118C: Fermi GBM Observation
  47. Fermi GRB 240119A: Global MASTER-Net observations report
  48. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  49. GRB 240119A: Fermi GBM Final Localization
  50. GRB 240118C: Swift/BAT-GUANO detection of a burst
  51. GRB 240118A: GRBAlpha detection
  52. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  53. GRB 240115A: Fermi GBM Observation
  54. GRB 240118C: Fermi GBM Final Localization
  55. GRB 240118A: AbAO optical upper limit
  56. Fermi GRB 240118B: Global MASTER-Net observations report
  57. GRB 240118A: NuSTAR Offline Analysis of the GRB
  58. GRB 240117A: Glowbug gamma-ray detection
  59. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  60. Konus-Wind detection of GRB 240118A
  61. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A
  62. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  63. GRB 240118A: NuSTAR Detection of a Long GRB
  64. GRB 240118A: Fermi GBM Observation
  65. GRB 240118B: Fermi GBM Final Real-time Localization
  66. LAT GRB240118.08: Global MASTER-Net observations report
  67. GRB 240118A: Fermi-LAT detection
  68. GRID detection of GRB 231230A
  69. GRB 240118A: Fermi GBM Final Real-time Localization
  70. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  71. IPN triangulation of GRB 240112A (long)
  72. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  73. GRB 240115B: Fermi GBM Detection
  74. IceCube-240105A: ZTF optical observation of blazar PKS 0446+11
  75. GRB 240112C: VZLUSAT-2 detection
  76. GRB 240107A: VZLUSAT-2 detection
  77. Integral GRB240115.70: Global MASTER-Net observations report
  78. Fermi GRB 240115B: Global MASTER-Net observations report
  79. GRB 240115B: Fermi GBM Final Real-time Localization
  80. Konus-Wind detection of GRB 240112C
  81. Fermi GRB 240115A: Global MASTER-Net observations report
  82. GRB 240115A: Fermi GBM Final Real-time Localization
  83. GRB 240112C: GRBAlpha detection
  84. GRB 240112C: Fermi GBM Detection
  85. Fermi trigger No 726773850: Global MASTER-Net observations report
  86. GRB 240112E: Fermi GBM Final Localization
  87. Fermi GRB 240112D: Global MASTER-Net observations report
  88. GRB 240112D: Fermi GBM Final Real-time Localization
  89. Fermi trigger No 726774492: Global MASTER-Net observations report
  90. Swift GRB 240112C: Global MASTER-Net observations report
  91. Fermi GRB 240112B: Global MASTER-Net observations report
  92. GRB 240109A: Swift-BAT refined analysis
  93. GRB 240112C: Swift detection of a burst with an optical counterpart
  94. GRB 240112B: Fermi GBM Final Real-time Localization
  95. GRB 240112A: GECAM detection of a burst
  96. GRB 240109A: Fermi GBM Observation
  97. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
  98. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  99. GRB 240109B: Fermi GBM Final Real-time Localization
  100. IceCube-240105A: Three candidates from the Zwicky Transient Facility

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