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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"

37770 results found.

  1. GRB 240125A: AstroSat CZTI detection of a short burst
  2. GRB 240124B: AstroSat CZTI detection
  3. GRB 240123C: AstroSat CZTI detection
  4. GRB 240125B: Fermi GBM Final Localization
  5. GRB 240123B: Fermi GBM Observation
  6. GRB 240123A: Glowbug gamma-ray detection
  7. GRB 240125A (short): Glowbug gamma-ray detection
  8. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  9. GRB 240123A: GRBAlpha detection
  10. IPN triangulation of GRB 240123C (short)
  11. Fermi-LAT gamma-ray observations of IceCube-240123A
  12. GRB 240123A: further SAO RAS optical observations
  13. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  14. GRB 240123A: Swift-BAT refined analysis
  15. GRB 240123A: Mondy continued optical observations and the PL decay index
  16. GRB 240123A: SAO RAS optical observations
  17. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  18. Fermi/GBM trigger 727752941: BALROG analysis retraction
  19. GRB 240123A: Enhanced Swift-XRT position
  20. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  21. Fermi GRB 240123B: Global MASTER-Net observations report
  22. GRB 240122A: Swift/UVOT Upper Limits
  23. GRB 240123A: Swift-XRT refined Analysis
  24. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  25. Fermi GBM Sub-Threshold Detection of GRB 240123A
  26. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  27. GRB 240123B: Fermi GBM Final Real-time Localization
  28. GRB 240118A: Swift/UVOT Upper Limits
  29. GRB 240122B: Glowbug gamma-ray detection
  30. GRB 240123A: Mondy optical afterglow observations
  31. IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event
  32. Konus-Wind detection of GRB 240112A
  33. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  34. GRB 240122A: Swift-XRT afterglow detection
  35. GRB 240122A: VLT/X-shooter redshift confirmation
  36. GRB 240122A: Redshift from OSIRIS+/GTC
  37. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  38. GRB 240122A: GOTO optical counterpart candidate
  39. GRB 240122A: Tiled Swift observations
  40. Konus-Wind detection of GRB 240119A (short/hard)
  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 240119A: AstroSat CZTI detection of a short burst
  46. GRB 240118A: Mondy optical observations
  47. GRB 240118A: Swift-XRT afterglow detection
  48. GRB 240118C: Fermi GBM Observation
  49. Fermi GRB 240119A: Global MASTER-Net observations report
  50. GRB 240119A: Fermi GBM Final Localization
  51. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  52. GRB 240118C: Swift/BAT-GUANO detection of a burst
  53. GRB 240118A: GRBAlpha detection
  54. GRB 240115A: Fermi GBM Observation
  55. GRB 240118C: Fermi GBM Final Localization
  56. GRB 240118D: AstroSat CZTI detection
  57. GRB 240117A: AstroSat CZTI detection
  58. GRB 240118A: Swift ToO observations
  59. GRB 240118A: AbAO optical upper limit
  60. Fermi GRB 240118B: Global MASTER-Net observations report
  61. GRB 240118A: NuSTAR Offline Analysis of the GRB
  62. GRB 240117A: Glowbug gamma-ray detection
  63. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  64. Konus-Wind detection of GRB 240118A
  65. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  66. GRB 240118A: NuSTAR Detection of a Long GRB
  67. GRB 240118A: Fermi GBM Observation
  68. GRB 240118B: Fermi GBM Final Real-time Localization
  69. GRB 240118A: Fermi-LAT detection
  70. GRID detection of GRB 231230A
  71. GRB 240118A: Fermi GBM Final Real-time Localization
  72. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  73. IPN triangulation of GRB 240112A (long)
  74. GRB 240115B: AstroSat CZTI detection
  75. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  76. GRB 240115B: Fermi GBM Detection
  77. GRB 240112D: Glowbug gamma-ray detection
  78. GRB 240112C: Glowbug gamma-ray detection
  79. GRB 240112C: VZLUSAT-2 detection
  80. GRB 240107A: VZLUSAT-2 detection
  81. Fermi GRB 240115B: Global MASTER-Net observations report
  82. GRB 240115B: A long GRB detected by INTEGRAL
  83. GRB 240115B: Fermi GBM Final Real-time Localization
  84. Konus-Wind detection of GRB 240112C
  85. Fermi GRB 240115A: Global MASTER-Net observations report
  86. GRB 240115A: Fermi GBM Final Real-time Localization
  87. GRB 240112C: GRBAlpha detection
  88. GRB 240114A: MAXI/GSC detection
  89. GRB 240112C: Swift/UVOT Detection
  90. GRB 240112C: Fermi GBM Detection
  91. Fermi trigger No 726773850: Global MASTER-Net observations report
  92. GRB 240112C: Swift-XRT refined Analysis
  93. GRB 240112C: SAO RAS optical observations
  94. GRB 240112E: Fermi GBM Final Localization
  95. Fermi GRB 240112D: Global MASTER-Net observations report
  96. GRB 240112D: Fermi GBM Final Real-time Localization
  97. Fermi trigger No 726774492: Global MASTER-Net observations report
  98. Swift GRB 240112C: Global MASTER-Net observations report
  99. Fermi GRB 240112B: Global MASTER-Net observations report
  100. GRB 240109A: Swift-BAT refined analysis

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