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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"

28259 results found.

  1. IPN triangulation of GRB 221022C (short)
  2. GRB 221023A: AGILE/GRID analysis
  3. SGR 1935+2154: AstroSat CZTI Detections
  4. GRB 221025A: AstroSat CZTI detection
  5. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  6. GRB 221009A: spectroscopic confirmation of SN in LBT spectra
  7. Konus-Wind detection of GRB 221023A
  8. GRB 221024A: Swift/UVOT UV upper limits
  9. GRB 221022A: Swift-XRT observations
  10. GRB 221024A: Swift-XRT refined Analysis
  11. GRB 221022B: Detection by GRBAlpha
  12. GRB 221025A: Fermi-LAT detection
  13. IPN triangulation of GRB 221022B (long)
  14. GRB 221024A: GIT confirmation of the optical afterglow
  15. GRB 221024A: Enhanced Swift-XRT position
  16. GRB 221024A: D50 candidate afterglow
  17. GRB 221022B: AstroSat CZTI detection
  18. GRB 221022A: Fermi GBM detection
  19. GRB 221022A: Swift ToO observations
  20. GRB 221023A: Fermi-LAT detection
  21. GRB 221022B: Fermi GBM detection
  22. GRB 221009A: Determination of the black holes mass and spin
  23. GRB 221024A: Swift detection of a burst
  24. GRB 221023A: Fermi GBM Final Localization
  25. GRB 221023A: AGILE detection of a burst
  26. GRB 221022A: Swift/BAT-GUANO detection
  27. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  28. GRB 221022B: AGILE detection
  29. GRB 221009A: James Webb Space Telescope Observations
  30. GRB 221022B: Fermi GBM Final Real-time Localization
  31. GRB 221009A: optical observations, SN photometric evidence
  32. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  33. GRB 221022A: Fermi GBM Final Real-time Localization
  34. GRB 221020A: Detection by GRBAlpha
  35. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  36. GRB 221017A: CALET Gamma-Ray Burst Monitor detection
  37. GRB 221021A: Fermi GBM Final Real-time Localization
  38. GRB 221009A: 1.3m DFOT Optical Observations
  39. GRB221009A: LBT optical imaging
  40. GRB 221009A: Peak luminosity of the supernova vs. synchrotron afterglow
  41. GRB 221017A: Swift-XRT observations
  42. GRB 221020A: Fermi GBM Final Real-time Localization
  43. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  44. GRB 221009A: TNG NIR detection
  45. GRB 221009A: BOAO NIR detections
  46. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  47. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  48. GRB 221009A: Spectroscopic detection of emerging SN features
  49. GRB 221009A: Continued LDT Afterglow Monitoring
  50. GRB 221013B: Swift/BAT-GUANO detection
  51. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  52. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  53. GRB 221009A: GRANDMA observations
  54. SGR 1935+2154: Detection by GRBAlpha
  55. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  56. GRB 221017A: Swift ToO observations
  57. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  58. GRB 221009A: Second epoch of NuSTAR data
  59. IPN triangulation of GRB 221017A (long)
  60. GRB 221016A: Swift/UVOT Detection
  61. GRB 221016A: Swift-XRT refined Analysis
  62. Konus-Wind detection of GRB 221016A
  63. GRB 220926B: Detection by GRBAlpha
  64. GRB 221009A: A type I BdHN of exceptional energetics
  65. GRB 221016A: z-band upper limit, possible afterglow brightening
  66. GRB 221017A: MAXI/GSC detection
  67. GRB 221016A: Enhanced Swift-XRT position
  68. GRB 221016A: LCOGT Optical Afterglow Detection
  69. GRB 221016A: Swift detection of a burst
  70. GRB 221016A: Fermi GBM Final Real-time Localization
  71. GRB 221009A: Faulkes Telescope North continued optical afterglow follow-up
  72. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  73. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  74. GRB 221009A: LEIA X-ray Afterglow Detection
  75. GRB 221009A: VLT spectroscopic detection of the host galaxy
  76. GRB 221009A: ATCA detection
  77. GRB 221009A: Armchair Energetics
  78. GRB 221009A: ALMA and ACA detections
  79. GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
  80. GRB 221009A: Pan-STARRS optical photometry
  81. GRB 221009A: VLA detection
  82. MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
  83. GRB 221009A: continued REM optical/NIR observations and evidence for an achromatic steepening in the afterglow light curve
  84. GRB 221009A: IXPE preliminary upper limits of X-ray polarization
  85. GRB 221009A: HEBS detection
  86. GRB 221009A: Gemini-South Infrared Afterglow Detection
  87. GRB221009A: Gemini-South Optical Afterglow Detection
  88. GRB 221009A: a 397.7 GeV photon observed by Fermi-LAT at 0.4 day after the GBM trigger
  89. GRB 221014A: Fermi GBM Final Real-time Localization
  90. GRB 221009A: Gamma-ray Detection by SIRI-2
  91. GRB221009A: Ionospheric disturbance observed in India
  92. GRB221009A: Detection as sudden ionospheric disturbances (SID)
  93. MAXI GRB 221006A: Redshifts of the possible host galaxies
  94. GRB 221009A: search for neutrinos with KM3NeT
  95. GRB 221009A: MeerKAT detection
  96. GRB 221009A: Lowell Discovery Telescope Afterglow Detection
  97. GRB 221006A: Swift-XRT afterglow detection
  98. GRB 221009A: MITSuME Okayama optical observation
  99. GRB 221009A: GMG observation
  100. GRB 221013B: Fermi GBM Final Real-time Localization

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