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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19592 results found.

  1. GRB 201008A: Fermi GBM observation
  2. GRB 210323B: Fermi GBM observation
  3. Swift-BAT Trigger 1055000/GRB210612.54: MASTER optical source observation
  4. Swift ToO Observations of HAWC transient J0020+3108
  5. GRB 210605B: Swift-XRT afterglow detection
  6. GRB 210610A: Fermi GBM observations
  7. GRB 210610A: CAHA 2.2m Second Epoch
  8. GRB 210421B: Fermi GBM detection
  9. Swift GRB210612.54: Global MASTER-Net observations report
  10. Swift-BAT Trigger 1055000: Swift detection of an outburst from 4U 1543-47
  11. GRB210610B: SARA-KP 0.9m Optical Afterglow Detection
  12. GRB 210610B: MITSuME Akeno optical observation
  13. GRB 201228B: Fermi GBM observation
  14. GRB 210610B: VLA detection
  15. GRB 210610A: CAHA 2.2m observations and light-curve behavior
  16. GRB 210606A: Fermi GBM detection
  17. GRB 210605B: Fermi GBM detection
  18. GRB 210610B: Swift-XRT refined Analysis
  19. GRB 210610B: Swift-BAT refined analysis
  20. GRB 210610B: KAIT Optical Detection
  21. GRB 210610A: KAIT Optical Detection
  22. GRB 210610B: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
  23. GRB 210610A: Spectroscopy and redshift confirmation with the Himalayan Chandra Telescope
  24. GRB 210610B: Fermi GBM detection
  25. GRB 210610B: University of Siena Observatory optical photometry of the afterglow
  26. Konus-Wind detection of GRB 210610A
  27. Konus-Wind detection of GRB 210610B
  28. GRB 210610B: AGILE detection
  29. GRB 210610B: GOTO confirmation of afterglow detection
  30. GRB 210610A: Swift-XRT refined Analysis
  31. GRB 210610B: RATIR Optical and NIR Observations
  32. GRB 210610B: Enhanced Swift-XRT position
  33. GRB 210610B: SAO RAS optical observations
  34. GRB 210610A: Swift-BAT refined analysis
  35. GRB 210610A: 1.5m OSN optical observation
  36. GRB210610B: MeerLICHT multi-colour photometry
  37. GRB 210610B: BOOTES-2/TELMA optical observation
  38. Swift GRB 210610B: Global MASTER-Net observations report
  39. GRB 210610B: GIT optical detection
  40. Swift GRB210610.83: Global MASTER-Net OT detection
  41. GRB 210606A: Swift-XRT afterglow detection
  42. GRB 210610B: Swift detection of a burst with bright optical afterglow
  43. GRB 210610A: MITSuME Ishigaki optical observation
  44. GRB210610A: MeerLICHT multi-colour photometry
  45. Swift GRB 210610A: Global MASTER-Net observations report
  46. Swift GRB 210610A: MASTER optical counterpart observation
  47. GRB 210610A: Enhanced Swift-XRT position
  48. GRB 210610A: GIT optical detection
  49. GRB 210610A: Xinglong-2.16m optical afterglow observations
  50. GRB 210610A: MITSuME Akeno optical observation
  51. GRB 210610A: Swift detection of a burst with an optical counterpart
  52. IPN triangulation of GRB 210606B
  53. GRB 210605B: Swift-XRT observations
  54. IPN triangulation of GRB 210605A (short)
  55. GRB 210606A: 1.5m OSN optical upper limit
  56. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  57. GRB 210606A: Swift ToO observations
  58. GRB 210606A: Swift/BAT-GUANO detection and arcminute localization
  59. GRB 210605B: Swift ToO observations
  60. GRB 210605B: Swift/BAT-GUANO detection and arcminute localization
  61. Initial results of a NICER X-ray monitoring of the magnetar, Swift J1555.2-5402
  62. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  63. SGR J1555.2-5402: Swift-BAT refined analysis
  64. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  65. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402
  66. Swift Detection of probable new Swift SGR J1555.2-5402
  67. Swift GRB210603.41: Global MASTER-Net observations report
  68. GRB 210527A: Swift-BAT refined analysis
  69. GRB 210527A: Swift/UVOT Observations
  70. GRB 210527A: GIT optical upper limit
  71. Swift GRB 210527A: Global MASTER-Net observations report
  72. GRB 210527A: Swift-XRT refined Analysis
  73. GRB 210527A: Enhanced Swift-XRT position
  74. GRB 210527A: Swift-XRT observations
  75. GRB 210527A: Swift detection of a burst
  76. IPN triangulation of GRB 210524A
  77. GRB 210520A: Swift-XRT observations
  78. GRB210413B: further Swift-XRT observations
  79. GRB 210520A: Tiled Swift observations
  80. GRB 210520A: Fermi-LAT detection
  81. GRB 210517A: KCT optical upper limit
  82. Konus-Wind detection of GRB 210514A
  83. GRB 210517A: Swift-BAT refined analysis
  84. GRB 210517A: Swift-XRT refined Analysis
  85. GRB 210517A: Swift/UVOT Upper Limits
  86. GRB 210515C: Swift/UVOT Upper Limits
  87. GRB 210517A: AGILE detection
  88. GRB 210514A: CALET Gamma-Ray Burst Monitor detection
  89. GRB 210517A: Enhanced Swift-XRT position
  90. Swift GRB 210517A: Global MASTER-Net observations report
  91. GRB 210517A: Swift detection of a burst
  92. GRB 210515C: LCO Optical Upper Limit
  93. GRB 210504A: LCO Optical Afterglow Detection
  94. GRB 210514A: Swift/UVOT Upper Limits
  95. GRB 210515C: Swift-XRT refined Analysis
  96. Swift GRB210515.83: Global MASTER-Net observations report
  97. GRB 210515C: Swift-BAT refined analysis
  98. GRB 210515C: Swift detection of a burst
  99. GRB 210514A: Swift-BAT refined analysis
  100. Swift GRB210514.71: Global MASTER-Net observations report

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