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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"

36397 results found.

  1. GRB 240204a: Liverpool Telescope optical afterglow detection
  2. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  3. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  4. Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
  5. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  6. GRB 240204A: Montarrenti Observatory optical observations
  7. GRB 240204A: Enhanced Swift-XRT position
  8. GRB 240204A: Mondy optical afterglow candidate
  9. Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
  10. Fermi GRB 240204A: Global MASTER-Net observations report
  11. GRB 240204A: Swift detection of a burst
  12. GRB 240204A: Fermi GBM Final Real-time Localization
  13. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  14. Konus-Wind detection of GRB 240124B
  15. Konus-Wind detection of GRB 240123C
  16. IPN triangulation of GRB 240124B
  17. GRB 240201A: AstroSat CZTI detection
  18. GRB 240129A: Fermi GBM Observation
  19. IPN triangulation of GRB 240125B (short)
  20. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  21. IPN triangulation of GRB 240125A (short)
  22. GRB 240128A: Glowbug gamma-ray detection
  23. GRB 240128A: Swift-XRT observations
  24. GRB 240128A: GRBAlpha detection
  25. GRB 240128A: Tiled Swift observations
  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 240122A: ATCA detection of radio counterpart
  32. GRB 240127A: Fermi GBM Final Real-time Localization
  33. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  34. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 240125A: AstroSat CZTI detection of a short burst
  36. GRB 240124B: AstroSat CZTI detection
  37. GRB 240123C: AstroSat CZTI detection
  38. GRB 240125B: Fermi GBM Final Localization
  39. GRB 240123B: Fermi GBM Observation
  40. GRB 240123A: Glowbug gamma-ray detection
  41. GRB 240125A (short): Glowbug gamma-ray detection
  42. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  43. GRB 240123A: GRBAlpha detection
  44. IPN triangulation of GRB 240123C (short)
  45. GRB 240123A: further SAO RAS optical observations
  46. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  47. GRB 240123A: Swift-BAT refined analysis
  48. GRB 240123A: Mondy continued optical observations and the PL decay index
  49. GRB 240123A: SAO RAS optical observations
  50. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  51. Fermi/GBM trigger 727752941: BALROG analysis retraction
  52. GRB 240123A: Enhanced Swift-XRT position
  53. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  54. Fermi GRB 240123B: Global MASTER-Net observations report
  55. GRB 240122A: Swift/UVOT Upper Limits
  56. GRB 240123A: Swift-XRT refined Analysis
  57. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  58. Fermi GBM Sub-Threshold Detection of GRB 240123A
  59. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  60. GRB 240123B: Fermi GBM Final Real-time Localization
  61. GRB 240118A: Swift/UVOT Upper Limits
  62. GRB 240122B: Glowbug gamma-ray detection
  63. GRB 240123A: Mondy optical afterglow observations
  64. Konus-Wind detection of GRB 240112A
  65. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  66. GRB 240122A: Swift-XRT afterglow detection
  67. GRB 240122A: VLT/X-shooter redshift confirmation
  68. GRB 240122A: Redshift from OSIRIS+/GTC
  69. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  70. GRB 240122A: GOTO optical counterpart candidate
  71. GRB 240122A: Tiled Swift observations
  72. Konus-Wind detection of GRB 240119A (short/hard)
  73. GRB 240122A: MAXI/GSC detection
  74. IPN triangulation of GRB 240119A (short)
  75. GRB 240119A: GECAM detection of a short burst
  76. GRB 240118C: GECAM-B detection of a long burst
  77. GRB 240119A: AstroSat CZTI detection of a short burst
  78. GRB 240118A: Mondy optical observations
  79. GRB 240118A: Swift-XRT afterglow detection
  80. GRB 240118C: Fermi GBM Observation
  81. Fermi GRB 240119A: Global MASTER-Net observations report
  82. GRB 240119A: Fermi GBM Final Localization
  83. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  84. GRB 240118C: Swift/BAT-GUANO detection of a burst
  85. GRB 240118A: GRBAlpha detection
  86. GRB 240115A: Fermi GBM Observation
  87. GRB 240118C: Fermi GBM Final Localization
  88. GRB 240118D: AstroSat CZTI detection
  89. GRB 240117A: AstroSat CZTI detection
  90. GRB 240118A: Swift ToO observations
  91. GRB 240118A: AbAO optical upper limit
  92. Fermi GRB 240118B: Global MASTER-Net observations report
  93. GRB 240118A: NuSTAR Offline Analysis of the GRB
  94. GRB 240117A: Glowbug gamma-ray detection
  95. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  96. Konus-Wind detection of GRB 240118A
  97. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  98. GRB 240118A: NuSTAR Detection of a Long GRB
  99. GRB 240118A: Fermi GBM Observation
  100. GRB 240118B: Fermi GBM Final Real-time Localization

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