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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

14953 results found.

  1. GRB 221021A: Fermi GBM Final Real-time Localization
  2. GRB 221009A: 1.3m DFOT Optical Observations
  3. GRB 221020A: Fermi GBM Final Real-time Localization
  4. GRB 221009A: TNG NIR detection
  5. GRB 221009A: BOAO NIR detections
  6. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  7. GRB 221009A: Spectroscopic detection of emerging SN features
  8. GRB 221013B: Swift/BAT-GUANO detection
  9. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  10. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  11. GRB 221009A: GRANDMA observations
  12. SGR 1935+2154: Detection by GRBAlpha
  13. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  14. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  15. IPN triangulation of GRB 221017A (long)
  16. GRB 221016A: Swift/UVOT Detection
  17. Konus-Wind detection of GRB 221016A
  18. GRB 220926B: Detection by GRBAlpha
  19. GRB 221017A: MAXI/GSC detection
  20. GRB 221016A: LCOGT Optical Afterglow Detection
  21. GRB 221016A: Swift detection of a burst
  22. GRB 221016A: Fermi GBM Final Real-time Localization
  23. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  24. GRB 221009A: LEIA X-ray Afterglow Detection
  25. GRB 221009A: VLT spectroscopic detection of the host galaxy
  26. GRB 221009A: ATCA detection
  27. GRB 221009A: Armchair Energetics
  28. GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
  29. GRB 221009A: VLA detection
  30. MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
  31. GRB 221009A: HEBS detection
  32. GRB 221009A: Gemini-South Infrared Afterglow Detection
  33. GRB221009A: Gemini-South Optical Afterglow Detection
  34. GRB 221009A: a 397.7 GeV photon observed by Fermi-LAT at 0.4 day after the GBM trigger
  35. GRB 221014A: Fermi GBM Final Real-time Localization
  36. GRB 221009A: Gamma-ray Detection by SIRI-2
  37. GRB221009A: Ionospheric disturbance observed in India
  38. GRB221009A: Detection as sudden ionospheric disturbances (SID)
  39. GRB 221009A: search for neutrinos with KM3NeT
  40. GRB 221009A: MeerKAT detection
  41. GRB 221009A: Lowell Discovery Telescope Afterglow Detection
  42. GRB 221006A: Swift-XRT afterglow detection
  43. GRB 221009A: MITSuME Okayama optical observation
  44. GRB 221013B: Fermi GBM Final Real-time Localization
  45. GRB 221013A: Fermi GBM Final Real-time Localization
  46. INTEGRAL detection of a burst from SGR J1935+2154
  47. GRB 220829A: Detection by GRBAlpha
  48. GRB 220826B: Detection by GRBAlpha
  49. GRB 221009A: NuSTAR Detection
  50. GRB 221009A: LCOGT Optical Afterglow Detection
  51. GRB 221009A: COATLI Detection of the Afterglow
  52. GRB221009A: INTEGRAL detection of Hard X-ray emission up to 38 hours after trigger
  53. GRB 221009A: 10.4m GTC spectroscopic redshift confirmation
  54. GRB 221009A: Detection by GRBAlpha
  55. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  56. GRB 221011A: Fermi GBM Final Real-time Localization
  57. LHAASO observed GRB 221009A with more than 5000 VHE photons up to around 18 TeV
  58. GRB 221009A: NOEMA mm detection
  59. INTEGRAL detection of a burst from SGR J1935+2154
  60. GRB 221006A: CALET Gamma-Ray Burst Monitor detection
  61. Konus-Wind detection of GRB 221009A
  62. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  63. ​GRB 221009A: Multi-color detection of the optical
  64. GRB 221009A (Swift J1913.1+1946): AGILE/GRID detection
  65. GRB 221009: Swift/UVOT Detection
  66. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  67. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  68. GRB 221009A: REM optical and NIR detection of the afterglow
  69. GRB 221009A (Swift J1913.1+1946): AGILE/MCAL detection
  70. Swift J1913.1+1946: Early Optical Photometry
  71. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  72. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  73. GRB 221009A (Swift J1913.1+1946): Mondy optical observations
  74. IPN triangulation of extremely bright GRB 221009A
  75. Swift J1913.1+1946: Optical photometry
  76. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  77. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB
  78. Swift GRB221009.59: Global MASTER-Net OT detection
  79. GRB 221008A: MAXI/GSC detection
  80. GRB 220915A: Detection by GRBAlpha
  81. GRB 221006A: MAXI/GSC detection
  82. GRB 220912A: Detection by VZLUSAT-2
  83. GRB220927A: Detection by GRBAlpha
  84. GRB 220921A: ATCA detection of radio counterpart
  85. Konus-Wind detection of GRB 220930A
  86. GRB 220930A: AstroSat CZTI detection
  87. GRB 220930A: BOOTES-5/JGT early optical upper limit
  88. GRB 220930A: Swift detection of a burst
  89. Konus-Wind detection of GRB 220927A
  90. IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
  91. IPN triangulation of GRB 220927A (long)
  92. GRB 220921A: LCOGT Optical Observations
  93. GRB 220927A: Fermi GBM Final Localization
  94. GRB 220924A: Fermi GBM detection
  95. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  96. GRB 220926A: Swift detection of a burst
  97. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  98. GRB 220925A: Fermi GBM Final Real-time Localization
  99. GRB 220924A: Fermi GBM Final Real-time Localization
  100. GRB 220921A: ALMA detection

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