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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"

19596 results found.

  1. GRB 170827A, Swift-BAT refined analysis
  2. GRB 170827A: Swift/UVOT Upper Limits
  3. GRB 170827A: REM optical/NIR observations
  4. GRB 170827A: Swift detection of a burst
  5. LIGO/Virgo G299232: XRT Rank 2 source is not real
  6. LIGO/Virgo G299232: Swift/BAT data search
  7. GRB 170822A: AstroSat CZTI detection
  8. LIGO/Virgo G298048: Gemini-South Imaging and Spectroscopy
  9. Konus-Wind observation of GRB 170822A
  10. GRB 170823A: Swift-BAT refined analysis
  11. GRB 170823A: Swift detection of a burst
  12. LIGO/Virgo G298936: Swift/BAT data search
  13. GRB 170822A: RATIR Optical and NIR Observations
  14. GRB 170822A: AbAO optical upper limit
  15. GRB 170822A: Swift-BAT refined analysis
  16. GRB 170822A: Swift/UVOT Upper Limits
  17. LIGO/Virgo G298048: Chandra X-ray observations
  18. GRB 170822A: Swift-XRT refined Analysis
  19. GRB 170822A: Enhanced Swift-XRT position
  20. GRB 170822A:BOOTES-5/JGT optical afterglow candidate
  21. GRB 170822A: Swift detection of a burst
  22. LIGO/Virgo G298389: Swift/BAT data search
  23. LIGO/Virgo G298048: Possible X-ray detection with Swift
  24. LIGO/VIRGO G298048: ePESSTO optical spectra of the candidate optical/NIR counterpart of the gravitational wave G298048 in NGC4993.
  25. LIGO/VIRGO G298048: Expansion Velocity of SSS17a Consistent With Relativistic Merger Ejecta
  26. LIGO/Virgo G298048: optical spectral energy distribution of SSS17a
  27. LIGO/Virgo G298048: Continued Swift UV and X-ray Monitoring of SSS17a
  28. LIGO/VIRGO G298048: Swift UVOT detection and XRT upper limits
  29. LIGO/Virgo G298048: Swift/BAT data search
  30. IPN Triangulation of GRB 170816A (short/hard)
  31. LIGO/Virgo G297595: Swift-XRT sources
  32. GRB 170810A: VLA Detection
  33. GRB 170813A: Fermi GBM observation
  34. LIGO/Virgo G297595: Swift/BAT data search
  35. GRB 170813A: Swift/UVOT Upper Limits
  36. GRB 170813A: Swift-BAT refined analysis
  37. GRB 170813A: RATIR Optical and NIR Observations
  38. GRB 170810A: AbAO optical upper limit
  39. GRB 170813A: Swift-XRT refined Analysis
  40. GRB 170813A: Enhanced Swift-XRT position
  41. GRB 170813A: Swift detection of a burst
  42. GRB 170728B: 15 GHz upper limits from AMI
  43. GRB 170728A: 15 GHz upper limits from AMI
  44. GRB 170714A: 15 GHz upper limits from AMI
  45. GRB 170711A: 15 GHz upper limits from AMI
  46. GRB 170710B: 15 GHz upper limits from AMI
  47. GRB 170626A: 15 GHz upper limits from AMI
  48. GRB 170810A: Swift-BAT refined analysis
  49. GRB 170810A: Swift-XRT refined Analysis
  50. GRB 170810A: Swift/UVOT Detection
  51. GRB 170810A: Fermi GBM observation
  52. GRB 170810A: Fermi-LAT detection
  53. GRB 170810A: Enhanced Swift-XRT position
  54. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  55. LIGO/Virgo G296853: Swift/BAT data search
  56. GRB 170808B: Fermi LAT Detection
  57. IPN Triangulation of GRB 170805A (short)
  58. Konus-Wind observation of GRB 170724A
  59. GRB 170807A: Swift-BAT refined analysis
  60. GRB 170805A: Insight-HXMT detection
  61. GRB 170807A: Swift detection of a burst
  62. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  63. GRB 170803A: Swift/BAT spectral lag results
  64. GRB 170804A: LCO Observations
  65. GRB 170804A: Swift-BAT refined analysis
  66. GRB 170804A: Swift/UVOT Detection
  67. GRB 170804A: Swift-XRT refined Analysis
  68. GRB 170804A: Enhanced Swift-XRT position
  69. GRB 170803A: Swift-BAT refined analysis
  70. GRB 170803A: Swift/UVOT Detection
  71. GRB 170804A: Swift detection of a burst with optical counterpart
  72. Swift Trigger 766161 is not a GRB
  73. GRB 170803A: Swift-XRT refined Analysis
  74. GRB 170803A: Enhanced Swift-XRT position
  75. GRB 170803A: Fermi GBM observation
  76. GRB 170803A: Swift detection of a burst with an optical counterpart
  77. Swift Trigger 765783 is not an astrophysical event.
  78. GRB 170728B: time correction to MASTER GCN Circular 21391
  79. Swift J181723.1-164300: Swift detection of another pulse of the new Galactic source
  80. GRB 170728B: Swift/UVOT Further Analysis
  81. Konus-Wind observation of GRB 170728B
  82. GRB 170714A: Chandra observations
  83. GRB 170728B: Optical observations at Crni Vrh
  84. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  85. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  86. GRB 170728B: Swift/UVOT Upper Limits
  87. GRB 170728B iTelescope observation
  88. GRB 170728A: Swift/UVOT Detection
  89. Swift J181723.1-164300: Swift-BAT refined analysis
  90. GRB 170728B, Swift-BAT refined analysis
  91. GRB 170728B: Fermi GBM detection
  92. GRB 170728A: LCO observations
  93. GRB 170728B: Fermi-LAT detection
  94. GRB 170728A: Swift-XRT refined Analysis
  95. GRB 170728B: Enhanced Swift-XRT position
  96. GRB 170728B: Swift-XRT refined Analysis
  97. GRB 170728B: LT afterglow confirmation
  98. GRB 170728B: Swift detection of a short burst
  99. GRB 170728A: Swift-BAT refined analysis
  100. Swift triggers on a new galactic source: Swift J181723.1-164300

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