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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"

23726 results found.

  1. GRB 240205B: BOOTES-7 optical afterglow follow-up
  2. Fermi trigger No 728749569: Global MASTER-Net observations report
  3. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  4. GRB 240205B: Swift detection of a burst
  5. Swift GRB240205.93: Global MASTER-Net observations report
  6. Fermi trigger No 728796365: Global MASTER-Net observations report
  7. GRB 240204A: Montarrenti Observatory optical observations
  8. Fermi GRB 240204A: Global MASTER-Net observations report
  9. Fermi trigger No 728706420: Global MASTER-Net observations report
  10. IceCube Alert 240204.38: Global MASTER-Net observations report
  11. Konus-Wind detection of GRB 240124B
  12. Konus-Wind detection of GRB 240123C
  13. GRB 240201A: AstroSat CZTI detection
  14. GRB 240129A: Fermi GBM Observation
  15. IPN triangulation of GRB 240125B (short)
  16. GRB 240128A: Glowbug gamma-ray detection
  17. GRB 240128A: Swift-XRT observations
  18. GRB 240128A: GRBAlpha detection
  19. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  20. GRB 240128A: MAXI/GSC detection
  21. GRB 240125A: GRBAlpha detection
  22. Fermi GRB 240127A: Global MASTER-Net observations report
  23. GRB 240123C: GRBAlpha detection
  24. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  25. Swift Trigger 1211211 and 1211212 are not astrophysical
  26. GRB 240125A: AstroSat CZTI detection of a short burst
  27. GRB 240124B: AstroSat CZTI detection
  28. GRB 240125B: Fermi GBM Final Localization
  29. GRB 240123A: Glowbug gamma-ray detection
  30. GRB 240125A (short): Glowbug gamma-ray detection
  31. GRB 240123A: GRBAlpha detection
  32. GRB 240123A: further SAO RAS optical observations
  33. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  34. GRB 240123A: Swift-BAT refined analysis
  35. IceCube Alert 240123.48: Global MASTER-Net observations report
  36. GRB 240123A: SAO RAS optical observations
  37. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  38. Fermi GRB 240123B: Global MASTER-Net observations report
  39. GRB 240122A: Swift/UVOT Upper Limits
  40. GRB 240123A: Swift-XRT refined Analysis
  41. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  42. GRB 240118A: Swift/UVOT Upper Limits
  43. GRB 240122B: Glowbug gamma-ray detection
  44. Konus-Wind detection of GRB 240112A
  45. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  46. Swift GRB240123.46: Global MASTER-Net observations report
  47. GRB 240122A: Swift-XRT afterglow detection
  48. GRB 240122A: Redshift from OSIRIS+/GTC
  49. GRB 240122A: GOTO optical counterpart candidate
  50. Konus-Wind detection of GRB 240119A (short/hard)
  51. GRB 240122A: MAXI/GSC detection
  52. IPN triangulation of GRB 240119A (short)
  53. GRB 240118A: Mondy optical observations
  54. GRB 240118A: Swift-XRT afterglow detection
  55. Fermi GRB 240119A: Global MASTER-Net observations report
  56. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  57. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  58. GRB 240118A: GRBAlpha detection
  59. GRB 240118D: AstroSat CZTI detection
  60. Fermi GRB 240118B: Global MASTER-Net observations report
  61. GRB 240117A: Glowbug gamma-ray detection
  62. Konus-Wind detection of GRB 240118A
  63. LAT GRB240118.08: Global MASTER-Net observations report
  64. GRB 240118A: Fermi-LAT detection
  65. Swift Triggers 1209401 and 1209403 are not astrophysical events
  66. Swift Triggers 1209369 and 1209370 are not astrophysical events
  67. GRB 240115B: AstroSat CZTI detection
  68. GRB 240112D: Glowbug gamma-ray detection
  69. GRB 240112C: Glowbug gamma-ray detection
  70. GRB 240112C: VZLUSAT-2 detection
  71. GRB 240107A: VZLUSAT-2 detection
  72. Integral GRB240115.70: Global MASTER-Net observations report
  73. Fermi GRB 240115B: Global MASTER-Net observations report
  74. GRB 240115B: A long GRB detected by INTEGRAL
  75. Konus-Wind detection of GRB 240112C
  76. Fermi GRB 240115A: Global MASTER-Net observations report
  77. GRB 240112C: GRBAlpha detection
  78. GRB 240114A: MAXI/GSC detection
  79. GRB 240112C: Swift/UVOT Detection
  80. GRB 240112C: Fermi GBM Detection
  81. Fermi trigger No 726773850: Global MASTER-Net observations report
  82. GRB 240112C: Swift-XRT refined Analysis
  83. GRB 240112C: SAO RAS optical observations
  84. Fermi GRB 240112D: Global MASTER-Net observations report
  85. Fermi trigger No 726774492: Global MASTER-Net observations report
  86. Swift GRB 240112C: Global MASTER-Net observations report
  87. Fermi GRB 240112B: Global MASTER-Net observations report
  88. GRB 240109A: Swift-BAT refined analysis
  89. GRB 240112C: Swift detection of a burst with an optical counterpart
  90. GRB 240112A: GECAM detection of a burst
  91. GRB 240109A: Fermi GBM Observation
  92. GRB 240110A: AstroSat CZTI detection
  93. GRB 240108A: Glowbug gamma-ray detection
  94. GRB 240106B: Glowbug gamma-ray detection
  95. GRB 240106A: Glowbug gamma-ray detection
  96. Konus-Wind detection of GRB 240101C
  97. GRB 231215A: radio detection with the VLA
  98. GRB 230818A: further radio observations with the VLA
  99. GRB 230812B: further radio observations with the VLA
  100. Swift GRB240109.17: Global MASTER-Net observations report

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