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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"

21525 results found.

  1. Swift GRB210619.99: Global MASTER-Net observations report
  2. Swift GRB210619.99: Global MASTER-Net OT detection
  3. GRB 210618A: Swift/UVOT Upper Limits
  4. GRB 210618A: BOOTES-2/TELMA optical upper limit
  5. GRB 210618A: Swift-BAT refined analysis
  6. GRB 210618A: Fermi GBM observation
  7. GRB 210618A: Swift-XRT observations
  8. GRB 210618A: DDOTI upper limit for the optical afterglow
  9. GRB 210618A: Swift detection of a burst
  10. Swift GRB210618.07: Global MASTER-Net observations report
  11. GRB 210610B: Swift/UVOT Detection
  12. GRB 210610A: Swift/UVOT Detection
  13. GRB 201008A: Fermi GBM observation
  14. GRB 210323B: Fermi GBM observation
  15. Swift-BAT Trigger 1055000/GRB210612.54: MASTER optical source observation
  16. Swift ToO Observations of HAWC transient J0020+3108
  17. GRB 210605B: Swift-XRT afterglow detection
  18. GRB 210610A: Fermi GBM observations
  19. GRB 210610A: CAHA 2.2m Second Epoch
  20. GRB 210421B: Fermi GBM detection
  21. Swift GRB210612.54: Global MASTER-Net observations report
  22. Swift-BAT Trigger 1055000: Swift detection of an outburst from 4U 1543-47
  23. GRB210610B: SARA-KP 0.9m Optical Afterglow Detection
  24. GRB 210610B: MITSuME Akeno optical observation
  25. GRB 201228B: Fermi GBM observation
  26. GRB 210610B: VLA detection
  27. GRB 210610A: CAHA 2.2m observations and light-curve behavior
  28. GRB 210606A: Fermi GBM detection
  29. GRB 210605B: Fermi GBM detection
  30. GRB 210610B: Swift-XRT refined Analysis
  31. GRB 210610B: Swift-BAT refined analysis
  32. GRB 210610B: KAIT Optical Detection
  33. GRB 210610A: KAIT Optical Detection
  34. GRB 210610B: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
  35. GRB 210610A: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
  36. GRB 210610B: Fermi GBM detection
  37. GRB 210610B: University of Siena Observatory optical photometry of the afterglow
  38. Konus-Wind detection of GRB 210610A
  39. Konus-Wind detection of GRB 210610B
  40. GRB 210610B: AGILE detection
  41. GRB 210610B: GOTO confirmation of afterglow detection
  42. GRB 210610A: Swift-XRT refined Analysis
  43. GRB 210610B: RATIR Optical and NIR Observations
  44. GRB 210610B: Enhanced Swift-XRT position
  45. GRB 210610B: SAO RAS optical observations
  46. GRB 210610A: Swift-BAT refined analysis
  47. GRB 210610A: 1.5m OSN optical observation
  48. GRB210610B: MeerLICHT multi-colour photometry
  49. GRB 210610B: BOOTES-2/TELMA optical observation
  50. Swift GRB 210610B: Global MASTER-Net observations report
  51. GRB 210610B: GIT optical detection
  52. Swift GRB210610.83: Global MASTER-Net OT detection
  53. GRB 210606A: Swift-XRT afterglow detection
  54. GRB 210610B: Swift detection of a burst with bright optical afterglow
  55. GRB 210610A: MITSuME Ishigaki optical observation
  56. GRB210610A: MeerLICHT multi-colour photometry
  57. Swift GRB 210610A: Global MASTER-Net observations report
  58. Swift GRB 210610A: MASTER optical counterpart observation
  59. GRB 210610A: Enhanced Swift-XRT position
  60. GRB 210610A: GIT optical detection
  61. GRB 210610A: Xinglong-2.16m optical afterglow observations
  62. GRB 210610A: MITSuME Akeno optical observation
  63. GRB 210610A: Swift detection of a burst with an optical counterpart
  64. IPN triangulation of GRB 210606B
  65. GRB 210605B: Swift-XRT observations
  66. IPN triangulation of GRB 210605A (short)
  67. GRB 210606A: 1.5m OSN optical upper limit
  68. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  69. GRB 210606A: Swift ToO observations
  70. GRB 210606A: Swift/BAT-GUANO detection and arcminute localization
  71. GRB 210605B: Swift ToO observations
  72. GRB 210605B: Swift/BAT-GUANO detection and arcminute localization
  73. Initial results of a NICER X-ray monitoring of the magnetar, Swift J1555.2-5402
  74. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  75. SGR J1555.2-5402: Swift-BAT refined analysis
  76. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  77. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402
  78. Swift Detection of probable new Swift SGR J1555.2-5402
  79. Swift GRB210603.41: Global MASTER-Net observations report
  80. GRB 210527A: Swift-BAT refined analysis
  81. GRB 210527A: Swift/UVOT Observations
  82. GRB 210527A: GIT optical upper limit
  83. GRB 210527A: MITSuME Akeno optical upper limits
  84. Swift GRB 210527A: Global MASTER-Net observations report
  85. GRB 210527A: Swift-XRT refined Analysis
  86. GRB 210527A: RATIR Optical and NIR Observations
  87. GRB 210527A: Enhanced Swift-XRT position
  88. GRB 210527A: Swift-XRT observations
  89. GRB 210527A: Swift detection of a burst
  90. IPN triangulation of GRB 210524A
  91. GRB 210520A: Swift-XRT observations
  92. GRB210413B: further Swift-XRT observations
  93. GRB 210520A: Tiled Swift observations
  94. GRB 210520A: Fermi-LAT detection
  95. GRB 210517A: KCT optical upper limit
  96. Konus-Wind detection of GRB 210514A
  97. GRB 210517A: Swift-BAT refined analysis
  98. GRB 210517A: Swift-XRT refined Analysis
  99. GRB 210517A: Swift/UVOT Upper Limits
  100. GRB 210515C: Swift/UVOT Upper Limits

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