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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"

32722 results found.

  1. Konus-Wind detection of GRB 240204A
  2. Konus-Wind detection of GRB 240205A (short)
  3. IPN triangulation of GRB 240205A (short)
  4. Fermi-LAT gamma-ray observations of IceCube-240204A
  5. GRB 240205B: PRIME near infrared detection
  6. GRB 240205A (short): Glowbug gamma-ray detection
  7. GRB240204A: Swift/UVOT Upper Limits
  8. GRB 240205B: AstroSat CZTI detection
  9. GRB 240205B: Swift-BAT refined analysis
  10. Konus-Wind detection of GRB 240205B (long / very soft)
  11. Konus-Wind detection of GRB 240125A
  12. GRB 240205B: VLT/X-shooter redshift
  13. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  14. GRB 240205B: ATCA detection of radio counterpart
  15. GRB 240205B: REM detection of the optical/NIR afterglow
  16. GRB 240205B: Fermi GBM Observation
  17. GRB 240204A: AstroSat CZTI detection
  18. GRB 240204A: Mondy optical afterglow observations
  19. GRB 240204A : OHP/T193/T120 optical afterglow fading detection
  20. GRB 240205B: GECAM detection of a long burst
  21. GRB 240204A: Swift-BAT refined analysis
  22. GRB 240205B: Skynet Optical Afterglow Observations
  23. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  24. GRB 240204A: Fermi GBM Observation
  25. GRB 240204a: Liverpool Telescope optical afterglow detection
  26. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  27. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  28. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  29. GRB 240204A: Montarrenti Observatory optical observations
  30. GRB 240204A: Mondy optical afterglow candidate
  31. Fermi GRB 240204A: Global MASTER-Net observations report
  32. GRB 240204A: Swift detection of a burst
  33. GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
  34. Konus-Wind detection of GRB 240124B
  35. Konus-Wind detection of GRB 240123C
  36. IPN triangulation of GRB 240124B
  37. GRB 240129A: Fermi GBM Observation
  38. IPN triangulation of GRB 240125B (short)
  39. IPN triangulation of GRB 240125A (short)
  40. GRB 240128A: Glowbug gamma-ray detection
  41. GRB 240128A: GRBAlpha detection
  42. GRB 240128A: Tiled Swift observations
  43. GRB 240128A: CALET Gamma-Ray Burst Monitor detection
  44. GRB 240125A: GRBAlpha detection
  45. Fermi GRB 240127A: Global MASTER-Net observations report
  46. GRB 240123C: GRBAlpha detection
  47. GRB 240122A: ATCA detection of radio counterpart
  48. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  49. GRB 240125A: CALET Gamma-Ray Burst Monitor detection
  50. GRB 240125A: AstroSat CZTI detection of a short burst
  51. GRB 240123C: AstroSat CZTI detection
  52. GRB240122A: PRIME near infrared detection
  53. GRB 240123B: Fermi GBM Observation
  54. GRB 240123A: Glowbug gamma-ray detection
  55. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  56. GRB 240123A: GRBAlpha detection
  57. IPN triangulation of GRB 240123C (short)
  58. Fermi-LAT gamma-ray observations of IceCube-240123A
  59. GRB 240123A: further SAO RAS optical observations
  60. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  61. GRB 240123A: Swift-BAT refined analysis
  62. GRB 240123A: Mondy continued optical observations and the PL decay index
  63. GRB 240123A: SAO RAS optical observations
  64. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  65. Fermi/GBM trigger 727752941: BALROG analysis retraction
  66. Fermi GRB 240123B: Global MASTER-Net observations report
  67. GRB 240122A: Swift/UVOT Upper Limits
  68. Fermi GBM Sub-Threshold Detection of GRB 240123A
  69. GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605
  70. GRB 240118A: Swift/UVOT Upper Limits
  71. GRB 240123A: Mondy optical afterglow observations
  72. Konus-Wind detection of GRB 240112A
  73. GRB 240122A: Swift-XRT afterglow detection
  74. GRB 240122A: VLT/X-shooter redshift confirmation
  75. GRB 240122A: Redshift from OSIRIS+/GTC
  76. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  77. GRB 240122A: GOTO optical counterpart candidate
  78. GRB 240122A: Tiled Swift observations
  79. Konus-Wind detection of GRB 240119A (short/hard)
  80. IPN triangulation of GRB 240119A (short)
  81. GRB 240119A: GECAM detection of a short burst
  82. GRB 240118C: GECAM-B detection of a long burst
  83. GRB 240119A: AstroSat CZTI detection of a short burst
  84. GRB 240118A: Mondy optical observations
  85. GRB 240118C: Fermi GBM Observation
  86. Fermi GRB 240119A: Global MASTER-Net observations report
  87. IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER
  88. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  89. GRB 240118A: GRBAlpha detection
  90. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  91. GRB 240115A: Fermi GBM Observation
  92. GRB 240117A: AstroSat CZTI detection
  93. GRB 240118A: Swift ToO observations
  94. GRB 240118A: AbAO optical upper limit
  95. Fermi GRB 240118B: Global MASTER-Net observations report
  96. GRB 240118A: NuSTAR Offline Analysis of the GRB
  97. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  98. Konus-Wind detection of GRB 240118A
  99. GRB 240118A: NuSTAR Detection of a Long GRB
  100. GRB 240118A: Fermi GBM Observation

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