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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"

23733 results found.

  1. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 240205B: BOOTES-6 optical afterglow follow-up
  3. GRB 240205B: REM detection of the optical/NIR afterglow
  4. GRB 240205B: Fermi GBM Observation
  5. GRB 240204A: AstroSat CZTI detection
  6. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  7. GRB 240204A: Swift-BAT refined analysis
  8. GRB 240205B: BOOTES-7 optical afterglow follow-up
  9. Fermi trigger No 728749569: Global MASTER-Net observations report
  10. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  11. GRB 240205B: Swift detection of a burst
  12. Swift GRB240205.93: Global MASTER-Net observations report
  13. Fermi trigger No 728796365: Global MASTER-Net observations report
  14. GRB 240204A: Montarrenti Observatory optical observations
  15. Fermi GRB 240204A: Global MASTER-Net observations report
  16. Fermi trigger No 728706420: Global MASTER-Net observations report
  17. IceCube Alert 240204.38: Global MASTER-Net observations report
  18. Konus-Wind detection of GRB 240124B
  19. Konus-Wind detection of GRB 240123C
  20. GRB 240201A: AstroSat CZTI detection
  21. GRB 240129A: Fermi GBM Observation
  22. IPN triangulation of GRB 240125B (short)
  23. GRB 240128A: Glowbug gamma-ray detection
  24. GRB 240128A: Swift-XRT observations
  25. GRB 240128A: GRBAlpha detection
  26. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  27. GRB 240128A: MAXI/GSC detection
  28. GRB 240125A: GRBAlpha detection
  29. Fermi GRB 240127A: Global MASTER-Net observations report
  30. GRB 240123C: GRBAlpha detection
  31. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  32. Swift Trigger 1211211 and 1211212 are not astrophysical
  33. GRB 240125A: AstroSat CZTI detection of a short burst
  34. GRB 240124B: AstroSat CZTI detection
  35. GRB 240125B: Fermi GBM Final Localization
  36. GRB 240123A: Glowbug gamma-ray detection
  37. GRB 240125A (short): Glowbug gamma-ray detection
  38. GRB 240123A: GRBAlpha detection
  39. GRB 240123A: further SAO RAS optical observations
  40. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  41. GRB 240123A: Swift-BAT refined analysis
  42. IceCube Alert 240123.48: Global MASTER-Net observations report
  43. GRB 240123A: SAO RAS optical observations
  44. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  45. Fermi GRB 240123B: Global MASTER-Net observations report
  46. GRB 240122A: Swift/UVOT Upper Limits
  47. GRB 240123A: Swift-XRT refined Analysis
  48. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  49. GRB 240118A: Swift/UVOT Upper Limits
  50. GRB 240122B: Glowbug gamma-ray detection
  51. Konus-Wind detection of GRB 240112A
  52. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  53. Swift GRB240123.46: Global MASTER-Net observations report
  54. GRB 240122A: Swift-XRT afterglow detection
  55. GRB 240122A: Redshift from OSIRIS+/GTC
  56. GRB 240122A: GOTO optical counterpart candidate
  57. Konus-Wind detection of GRB 240119A (short/hard)
  58. GRB 240122A: MAXI/GSC detection
  59. IPN triangulation of GRB 240119A (short)
  60. GRB 240118A: Mondy optical observations
  61. GRB 240118A: Swift-XRT afterglow detection
  62. Fermi GRB 240119A: Global MASTER-Net observations report
  63. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  64. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  65. GRB 240118A: GRBAlpha detection
  66. GRB 240118D: AstroSat CZTI detection
  67. Fermi GRB 240118B: Global MASTER-Net observations report
  68. GRB 240117A: Glowbug gamma-ray detection
  69. Konus-Wind detection of GRB 240118A
  70. LAT GRB240118.08: Global MASTER-Net observations report
  71. GRB 240118A: Fermi-LAT detection
  72. Swift Triggers 1209401 and 1209403 are not astrophysical events
  73. Swift Triggers 1209369 and 1209370 are not astrophysical events
  74. GRB 240115B: AstroSat CZTI detection
  75. GRB 240112D: Glowbug gamma-ray detection
  76. GRB 240112C: Glowbug gamma-ray detection
  77. GRB 240112C: VZLUSAT-2 detection
  78. GRB 240107A: VZLUSAT-2 detection
  79. Integral GRB240115.70: Global MASTER-Net observations report
  80. Fermi GRB 240115B: Global MASTER-Net observations report
  81. GRB 240115B: A long GRB detected by INTEGRAL
  82. Konus-Wind detection of GRB 240112C
  83. Fermi GRB 240115A: Global MASTER-Net observations report
  84. GRB 240112C: GRBAlpha detection
  85. GRB 240114A: MAXI/GSC detection
  86. GRB 240112C: Swift/UVOT Detection
  87. GRB 240112C: Fermi GBM Detection
  88. Fermi trigger No 726773850: Global MASTER-Net observations report
  89. GRB 240112C: Swift-XRT refined Analysis
  90. GRB 240112C: SAO RAS optical observations
  91. Fermi GRB 240112D: Global MASTER-Net observations report
  92. Fermi trigger No 726774492: Global MASTER-Net observations report
  93. Swift GRB 240112C: Global MASTER-Net observations report
  94. Fermi GRB 240112B: Global MASTER-Net observations report
  95. GRB 240109A: Swift-BAT refined analysis
  96. GRB 240112C: Swift detection of a burst with an optical counterpart
  97. GRB 240112A: GECAM detection of a burst
  98. GRB 240109A: Fermi GBM Observation
  99. GRB 240110A: AstroSat CZTI detection
  100. GRB 240108A: Glowbug gamma-ray detection

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