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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"

21468 results found.

  1. GRB 221027A: Fermi-LAT detection
  2. GRB 221024A: GRANDMA observations
  3. IPN triangulation of GRB 221022C (short)
  4. GRB 221024A: Swift-BAT refined analysis
  5. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  6. GRB 221024A: Swift/UVOT UV upper limits
  7. GRB 221022A: Swift-XRT observations
  8. GRB 221024A: Swift-XRT refined Analysis
  9. GRB 221022B: Detection by GRBAlpha
  10. GRB 221025A: Fermi-LAT detection
  11. IPN triangulation of GRB 221022B (long)
  12. GRB 221024A: GIT confirmation of the optical afterglow
  13. GRB 221024A: Enhanced Swift-XRT position
  14. GRB 221024A: D50 candidate afterglow
  15. GRB 221022B: AstroSat CZTI detection
  16. GRB 221022A: Fermi GBM detection
  17. GRB 221022A: Swift ToO observations
  18. GRB 221023A: Fermi-LAT detection
  19. GRB 221022B: Fermi GBM detection
  20. GRB 221021A: Fermi GBM observation
  21. GRB 221009A: Determination of the black holes mass and spin
  22. GRB 221024A: Swift detection of a burst
  23. GRB 221022A: Swift/BAT-GUANO detection
  24. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  25. GRB 221009A: optical observations, SN photometric evidence
  26. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  27. GRB 221017A: Swift-XRT observations
  28. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  29. GRB 221009A: BOAO NIR detections
  30. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  31. GRB 221009A: Spectroscopic detection of emerging SN features
  32. GRB 221013B: Swift/BAT-GUANO detection
  33. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  34. GRB 221009A: GRANDMA observations
  35. The probability of observing GRB 221009A at z = 0.151
  36. GRB 221017A: Swift ToO observations
  37. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  38. GRB 221009A: Second epoch of NuSTAR data
  39. GRB 221016A: Swift-BAT refined analysis
  40. GRB 221016A: Swift/UVOT Detection
  41. GRB 221016A: Swift-XRT refined Analysis
  42. Konus-Wind detection of GRB 221016A
  43. GRB 221016A: Fermi GBM observation
  44. GRB 221009A: A type I BdHN of exceptional energetics
  45. GRB 221016A: Enhanced Swift-XRT position
  46. GRB 221016A: LCOGT Optical Afterglow Detection
  47. GRB 221016A: Swift detection of a burst
  48. Swift GRB221016.99: Global MASTER-Net observations report
  49. GRB 221009A: Faulkes Telescope North continued optical afterglow follow-up
  50. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  51. GRB 221009A: LEIA X-ray Afterglow Detection
  52. GRB 221009A: ATCA radio spectrum
  53. GRB 221009A: Armchair Energetics
  54. GRB 221009A: Fermi LAT data rate effects due to extremely high flux
  55. GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
  56. GRB 221009A: Pan-STARRS optical photometry
  57. MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
  58. GRB 221009A: continued REM optical/NIR observations and evidence for an achromatic steepening in the afterglow light curve
  59. GRB 221009A: HEBS detection
  60. GRB 221009A: Gamma-ray Detection by SIRI-2
  61. GRB221009A: Detection as sudden ionospheric disturbances (SID)
  62. GRB 221009A: search for neutrinos with KM3NeT
  63. GRB221009A: LCOGT Continued Observations - Optical Upper Limits
  64. GRB 221009A/Swift J1913.1+1946: low-frequency ASKAP observations
  65. GRB 221006A: Swift-XRT afterglow detection
  66. GRB 221009A: MITSuME Okayama optical observation
  67. GRB 221009A: Sayan observatory 1.6-m telescope observations
  68. GRB 221009A/Swift J1913.1+1946: SMA observations
  69. GRB 221009A/Swift J1913.1+1946: eMERLIN observations
  70. INTEGRAL detection of a burst from SGR J1935+2154
  71. GRB 221009A: NuSTAR Detection
  72. GRB 221009A: LCOGT Optical Afterglow Detection
  73. GRB221009A: INTEGRAL detection of Hard X-ray emission up to 38 hours after trigger
  74. GRB 221009A (Swift J1913.1+1946): Swift-BAT refined analysis
  75. GRB 221009A: 10.4m GTC spectroscopic redshift confirmation
  76. GRB 221009A: Detection by GRBAlpha
  77. GRB 221009A: Sintez-Newton/CrAO optical observations
  78. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  79. GRB 221006A: Swift ToO observations
  80. Swift/XRT discovery of multiple dust-scattering X-ray rings around GRB 221009A
  81. GRB 221009A (Swift J1913.1+1946): iTelescope optical observation
  82. LHAASO observed GRB 221009A with more than 5000 VHE photons up to around 18 TeV
  83. GRB 221009A: Continued Swift/XRT observations
  84. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  85. GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
  86. GRB 221009A: Lulin SLT-40cm optical observations
  87. Swift J1913.1+1946: New Photometry
  88. GRB 221009A: Upper limits from a neutrino search with IceCube
  89. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  90. GRB221009A/Swift J1913.1+1946: SRG/ART-XC observation
  91. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  92. GRB221009A/Swift J1913.1+1946: Solar Orbiter STIX measurements
  93. GRB221009A/Swift J1913.1+1946: INTEGRAL SPI/ACS observations
  94. GRB 221009A: Fermi-LAT refined analysis
  95. GRB 221009A (Swift J1913.1+1946): AGILE/GRID detection
  96. GRB 221009: Swift/UVOT Detection
  97. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  98. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  99. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  100. GRB 221009A: Swift-XRT refined Analysis

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