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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"

11607 results found.

  1. GRB 230812B: SAO RAS optical observations
  2. GRB 230812B: GAD Observatory optical observations (upper limit)
  3. GRB 230812B: iTelescope optical upper limit
  4. GRB 230812B: continued SAO RAS optical observation
  5. GRB230815A: BOOTES-6/DPRT optical upper limit
  6. GRB 230815A: Fermi GBM detection
  7. Fermi GRB 230814A: Global MASTER-Net observations report
  8. GRB 230812B: continued AbAO optical afterglow observations
  9. GRB 230812B: Optical observaions from Rozhen Observatory
  10. GRB 230812B: Upper limits from a neutrino search with IceCube
  11. GRB 230812B: GRANDMA further observations of ZTF23aaxeacr candidate afterglow
  12. GRB 230814A: BALROG localization (Fermi Trigger 713732101 / GRB 230814788)
  13. GRB 230812B: CrAO ZTSh optical observations
  14. GRB 230814A: Fermi GBM Final Real-time Localization
  15. GRB 230812B: Koshka Zeiss-1000 optical observations
  16. GRB 230812B: GIT optical follow-up
  17. GRB 230812B: Leavitt Observatory optical observations
  18. GRB 230812B : optical observations from Observatoire de Haute-Provence
  19. GRB 230812B: Bassano Bresciano Observatory optical observations
  20. GRB 230812B: Faulkes Telescope North optical afterglow follow-up
  21. GRB 230812B: AbAO optical observations
  22. GRB 230812B: Redshift from OSIRIS+/GTC
  23. Konus-Wind detection of GRB 230812B
  24. GRB230812B: AGILE/MCAL detection
  25. GRB 230812B: GECAM-C observation of a very bright burst
  26. GRB 230812B: Swift-XRT afterglow detection
  27. GRB 230812: Swift/UVOT Detection
  28. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  29. Fermi GRB 230812B: MASTER optical counterpart
  30. GRB 230812B: KAIT Optical Afterglow Candidate
  31. GRB 230812B: Improved Swift/XRT localization
  32. GRB 230812B: Fermi-LAT detection
  33. GRB 230812B: Fermi GBM Observation of a very bright burst
  34. Fermi GRB 230812B: Global MASTER-Net observations report
  35. GRB 230812B: Tiled Swift observations
  36. GRB 230812B: Fermi GBM detection of an extremely bright GRB
  37. GRB 230812B: Fermi GBM Final Real-time Localization
  38. Fermi trigger No 713525317: Global MASTER-Net observations report
  39. GRB 230812A: Fermi GBM Final Real-time Localization
  40. GRB 230808A: Fermi GBM Detection
  41. GRB 230805B: AstroSat CZTI detection
  42. GRB 230808A: Swift/BAT-GUANO detection of a burst
  43. Fermi trigger No 713136868: Global MASTER-Net observations report
  44. GRB 230808B: Fermi GBM Final Real-time Localization
  45. The Fermi GBM Trigger 713134237 / 230807868 is not associated with LIGO/Virgo/KAGRA S230807f.
  46. Fermi trigger No 713205976: Global MASTER-Net observations report
  47. GRB 230808A: Fermi GBM Final Real-time Localization
  48. Fermi GRB 230807A: Global MASTER-Net observations report
  49. Fermi trigger No 713134237: Global MASTER-Net observations report
  50. GRB 230807A: Fermi GBM Final Real-time Localization
  51. Konus-Wind detection of GRB 230803A
  52. GRB 230805B: Fermi GBM observation
  53. GRB 230806A: Fermi GBM Final Localization
  54. Fermi trigger No 712991593: Global MASTER-Net observations report
  55. Fermi trigger No 712987357: Global MASTER-Net observations report
  56. Fermi GRB 230805A: Global MASTER-Net observations report
  57. Fermi trigger No 712927418: Global MASTER-Net observations report
  58. GRB 230805A: Fermi GBM Final Real-time Localization
  59. GRB 230802B: AstroSat CZTI detection
  60. GRB 230802A: Fermi GBM observation
  61. GRB 230804A: Fermi GBM Final Real-time Localization
  62. Fermi trigger No 712798043: Global MASTER-Net observations report
  63. IPN triangulation of GRB 230803A
  64. GRB 230803A: AstroSat CZTI detection
  65. Fermi trigger No 712718833: Global MASTER-Net observations report
  66. GRB 230803A: Fermi GBM Final Real-time Localization
  67. Fermi trigger No 712713532: Global MASTER-Net observations report
  68. Fermi trigger No 712651827: Global MASTER-Net observations report
  69. GRB 230802B: Fermi GBM Final Localization
  70. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  71. GRB 230723A: SPT-3G millimeter-band transient event inconsistent with IPN position
  72. LIGO/Virgo/KAGRA S230731an: not observable by Fermi-GBM
  73. GRB 230731A: Fermi GBM Final Real-time Localization
  74. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  75. Fermi trigger No 712390645: Global MASTER-Net observations report
  76. Fermi-LAT gamma-ray observations of IceCube-230727A
  77. Fermi trigger No 712306969: Global MASTER-Net observations report
  78. GRB 230728A: Fermi GBM Observation
  79. GRB 230727A: AstroSat CZTI detection
  80. GRB 230727A: Swift/BAT-GUANO detection of a burst
  81. Fermi-LAT gamma-ray observations of IceCube-230725A
  82. Fermi-LAT gamma-ray observations of IceCube-230724A
  83. Fermi trigger No 712143685: Global MASTER-Net observations report
  84. IceCube-230727A - IceCube observation of a high-energy neutrino candidate track-like event
  85. GRB 230727A: Fermi GBM Final Real-time Localization
  86. Konus-Wind detection of GRB 230723A
  87. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  88. IceCube-230725A - IceCube observation of a high-energy neutrino candidate track-like event
  89. IPN triangulation of GRB 230723A (short)
  90. Fermi Gamma-ray Burst Monitor trigger 711982704/230725540 is not a GRB
  91. GRB 230725B: Fermi GBM Final Real-time Localization
  92. GRB 230725A: Fermi GBM Final Real-time Localization
  93. GRB 230723B: Fermi GBM observation
  94. Fermi trigger No 711853834: Global MASTER-Net observations report
  95. GRB 230724A: Fermi GBM Final Real-time Localization
  96. Fermi trigger No 711805358: Global MASTER-Net observations report
  97. GRB 230723A: AGILE/MCAL detection
  98. Fermi GRB 230723A: Global MASTER-Net observations report
  99. GRB 230723A: Fermi GBM Final Real-time Localization
  100. IPN triangulation of GRB 230715D

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