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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"

36351 results found.

  1. GRB 240123A: Swift-BAT refined analysis
  2. GRB 240123A: Mondy continued optical observations and the PL decay index
  3. GRB 240123A: SAO RAS optical observations
  4. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  5. Fermi/GBM trigger 727752941: BALROG analysis retraction
  6. GRB 240123A: Enhanced Swift-XRT position
  7. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  8. Fermi GRB 240123B: Global MASTER-Net observations report
  9. GRB 240122A: Swift/UVOT Upper Limits
  10. GRB 240123A: Swift-XRT refined Analysis
  11. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  12. Fermi GBM Sub-Threshold Detection of GRB 240123A
  13. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  14. GRB 240123B: Fermi GBM Final Real-time Localization
  15. GRB 240118A: Swift/UVOT Upper Limits
  16. GRB 240122B: Glowbug gamma-ray detection
  17. GRB 240123A: Mondy optical afterglow observations
  18. Konus-Wind detection of GRB 240112A
  19. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  20. GRB 240122A: Swift-XRT afterglow detection
  21. GRB 240122A: VLT/X-shooter redshift confirmation
  22. GRB 240122A: Redshift from OSIRIS+/GTC
  23. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  24. GRB 240122A: GOTO optical counterpart candidate
  25. GRB 240122A: Tiled Swift observations
  26. Konus-Wind detection of GRB 240119A (short/hard)
  27. GRB 240122A: MAXI/GSC detection
  28. IPN triangulation of GRB 240119A (short)
  29. GRB 240119A: GECAM detection of a short burst
  30. GRB 240118C: GECAM-B detection of a long burst
  31. GRB 240119A: AstroSat CZTI detection of a short burst
  32. GRB 240118A: Mondy optical observations
  33. GRB 240118A: Swift-XRT afterglow detection
  34. GRB 240118C: Fermi GBM Observation
  35. Fermi GRB 240119A: Global MASTER-Net observations report
  36. GRB 240119A: Fermi GBM Final Localization
  37. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  38. GRB 240118C: Swift/BAT-GUANO detection of a burst
  39. GRB 240118A: GRBAlpha detection
  40. GRB 240115A: Fermi GBM Observation
  41. GRB 240118C: Fermi GBM Final Localization
  42. GRB 240118D: AstroSat CZTI detection
  43. GRB 240117A: AstroSat CZTI detection
  44. GRB 240118A: Swift ToO observations
  45. GRB 240118A: AbAO optical upper limit
  46. Fermi GRB 240118B: Global MASTER-Net observations report
  47. GRB 240118A: NuSTAR Offline Analysis of the GRB
  48. GRB 240117A: Glowbug gamma-ray detection
  49. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  50. Konus-Wind detection of GRB 240118A
  51. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  52. GRB 240118A: NuSTAR Detection of a Long GRB
  53. GRB 240118A: Fermi GBM Observation
  54. GRB 240118B: Fermi GBM Final Real-time Localization
  55. GRB 240118A: Fermi-LAT detection
  56. GRID detection of GRB 231230A
  57. GRB 240118A: Fermi GBM Final Real-time Localization
  58. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  59. IPN triangulation of GRB 240112A (long)
  60. GRB 240115B: AstroSat CZTI detection
  61. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  62. GRB 240115B: Fermi GBM Detection
  63. GRB 240112D: Glowbug gamma-ray detection
  64. GRB 240112C: Glowbug gamma-ray detection
  65. GRB 240112C: VZLUSAT-2 detection
  66. GRB 240107A: VZLUSAT-2 detection
  67. Fermi GRB 240115B: Global MASTER-Net observations report
  68. GRB 240115B: A long GRB detected by INTEGRAL
  69. GRB 240115B: Fermi GBM Final Real-time Localization
  70. Konus-Wind detection of GRB 240112C
  71. Fermi GRB 240115A: Global MASTER-Net observations report
  72. GRB 240115A: Fermi GBM Final Real-time Localization
  73. GRB 240112C: GRBAlpha detection
  74. GRB 240114A: MAXI/GSC detection
  75. GRB 240112C: Swift/UVOT Detection
  76. GRB 240112C: Fermi GBM Detection
  77. GRB 240112C: Swift-XRT refined Analysis
  78. GRB 240112C: SAO RAS optical observations
  79. GRB 240112E: Fermi GBM Final Localization
  80. Fermi GRB 240112D: Global MASTER-Net observations report
  81. GRB 240112D: Fermi GBM Final Real-time Localization
  82. Swift GRB 240112C: Global MASTER-Net observations report
  83. Fermi GRB 240112B: Global MASTER-Net observations report
  84. GRB 240109A: Swift-BAT refined analysis
  85. GRB 240112C: Swift detection of a burst with an optical counterpart
  86. GRB 240112B: Fermi GBM Final Real-time Localization
  87. GRB 240112A: GECAM detection of a burst
  88. GRB 240109A: Fermi GBM Observation
  89. GRB 240110A: AstroSat CZTI detection
  90. GRB 240108A: Glowbug gamma-ray detection
  91. GRB 231214A: ATCA Radio Upper Limits
  92. GRB 240106B: Glowbug gamma-ray detection
  93. GRB 240106A: Glowbug gamma-ray detection
  94. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  95. GRB 240109B: Fermi GBM Final Real-time Localization
  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. GRB 240107A: AstroSat CZTI detection

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