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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"

19663 results found.

  1. GRB 170912A: Enhanced Swift-XRT position
  2. GRB 170912A: Prompt enhanced Swift-XRT position
  3. GRB 170912A: Swift detection of a burst
  4. Konus-Wind observation of GRB 170906A
  5. Konus-Wind observation of GRB 170906C
  6. GRB 170906A: AstroSat CZTI(Veto) detection
  7. Swift Triggered on MAXI J1535-571
  8. GRB 170906A: Swift/UVOT Detection
  9. GRB 170906B: Swift/UVOT Upper Limits
  10. GRB 170906B: Swift-XRT refined Analysis
  11. LIGO/Virgo G299232: Swift-XRT sources
  12. GRB 170906B: Swift-BAT refined analysis
  13. GRB 170906B: Fermi GBM detection
  14. GRB 170906A: Fermi GBM detection
  15. GRB 170906A: Swift-BAT refined analysis
  16. GRB 170906A: Swift-XRT refined Analysis
  17. GRB 170906C: Swift/UVOT Upper Limits
  18. GRB 170906C: Swift-XRT refined Analysis
  19. GRB 170906C: Swift-BAT refined analysis
  20. GRB 170906C: Enhanced Swift-XRT position
  21. GRB 170906A: MASTER-OAFA (Argentina) early automatic OT detection
  22. GRB 170906C: Swift-XRT observations
  23. GRB 170906A: Fermi-LAT detection
  24. GRB 170906C: Swift detection of a burst
  25. GRB 170906A: Enhanced Swift-XRT position
  26. GRB 170906B: Enhanced Swift-XRT position
  27. GRB 170906B: Swift detection of a burst
  28. GRB 170906A: Swift detection of a burst with an optical afterglow
  29. IPN Triangulation of GRB 170904A (long/very bright)
  30. LIGO/Virgo G299232: Lulin Observations of Possible OTs
  31. GRB 170904A: Insight-HXMT detection
  32. GRB 170903A: Fermi GBM observation
  33. LIGO/Virgo G299232: Maidanak observations of optical transient SwiftJ014008.5+343403.6
  34. LIGO/Virgo G299232: LOFAR follow-up
  35. Swift Trigger on continued activity of MAXI J1535-571
  36. GRB 170827A: LCO Observations
  37. GRB 170903A: Swift/UVOT Upper Limits
  38. GRB 170903A: UAFO /ISON optical upper limit
  39. LIGO/Virgo G298048: ATCA monitoring of SSS17a in NGC 4993
  40. GRB 170903A: Swift-XRT refined Analysis
  41. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  42. GRB 170903A: Enhanced Swift-XRT position
  43. GRB 170903A: Swift-BAT refined analysis
  44. GRB 170903A: Swift-XRT observations
  45. GRB 170903A: Swift detection of a burst
  46. Swift Triggers on MAXI J1535-571
  47. Swift Trigger 770431 (GRB 170902A) is a not a GRB
  48. GRB 170902A: Enhanced Swift-XRT position
  49. GRB 170902A: Swift detection of a burst or possible Galactic transient
  50. LIGO/Virgo G298048: Chandra monitoring of the X-ray emission from SSS17a
  51. LIGO/Virgo G298048: Continued X-ray monitoring and X-ray detection of GW170817 [erratum]]
  52. LIGO/Virgo G298048: Continued Gemini South observations
  53. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  54. LIGO/Virgo G299232: SVOM/2.16-m Optical Telescope Observations of Swift UVOT Transient
  55. LIGO/Virgo G299232: HAWC follow-up
  56. LIGO/Virgo G299232: Further Swift/UVOT Observations of Optical Transient SwiftJ014008.5+343403.6
  57. LIGO/Virgo G299232 : RATIR Optical and NIR Observations of Swift UVOT source
  58. LIGO/Virgo G299232: Liverpool Telescope observations
  59. LIGO/Virgo G299232: observations of the optical Transient Discovered by Swift/UVOT
  60. IPN Triangulation of GRB 170826B
  61. LIGO/Virgo G299232/PGWB170825.55: early MASTER observations of the Swift UVOT source position
  62. LIGO/Virgo G299232: GRAWITA Asiago/Copernico Telescope observations
  63. GRB170827A: Further GROND follow-up observations
  64. IPN Triangulation of GRB 170827B (short)
  65. LIGO/Virgo G299232: Optical Transient Discovery by Swift/UVOT
  66. GRB 170827A: Swift-XRT refined Analysis
  67. GROND observations of GRB170827A
  68. GRB 170823A: TAROT Calern observatory optical observations
  69. GRB 170827A, Swift-BAT refined analysis
  70. GRB 170827A: Swift/UVOT Upper Limits
  71. GRB 170827A: REM optical/NIR observations
  72. GRB 170827A: Swift detection of a burst
  73. LIGO/Virgo G299232: XRT Rank 2 source is not real
  74. LIGO/Virgo G299232: Swift/BAT data search
  75. GRB 170822A: AstroSat CZTI detection
  76. LIGO/Virgo G298048: Gemini-South Imaging and Spectroscopy
  77. Konus-Wind observation of GRB 170822A
  78. GRB 170823A: Swift-BAT refined analysis
  79. GRB 170823A: Swift detection of a burst
  80. LIGO/Virgo G298936: Swift/BAT data search
  81. GRB 170822A: RATIR Optical and NIR Observations
  82. GRB 170822A: AbAO optical upper limit
  83. GRB 170822A: Swift-BAT refined analysis
  84. GRB 170822A: Swift/UVOT Upper Limits
  85. LIGO/Virgo G298048: Chandra X-ray observations
  86. GRB 170822A: Swift-XRT refined Analysis
  87. GRB 170822A: Enhanced Swift-XRT position
  88. GRB 170822A:BOOTES-5/JGT optical afterglow candidate
  89. GRB 170822A: Swift detection of a burst
  90. LIGO/Virgo G298389: Swift/BAT data search
  91. LIGO/Virgo G298048: Possible X-ray detection with Swift
  92. LIGO/VIRGO G298048: ePESSTO optical spectra of the candidate optical/NIR counterpart of the gravitational wave G298048 in NGC4993.
  93. LIGO/VIRGO G298048: Expansion Velocity of SSS17a Consistent With Relativistic Merger Ejecta
  94. LIGO/Virgo G298048: optical spectral energy distribution of SSS17a
  95. LIGO/Virgo G298048: Continued Swift UV and X-ray Monitoring of SSS17a
  96. LIGO/VIRGO G298048: Swift UVOT detection and XRT upper limits
  97. LIGO/Virgo G298048: Swift/BAT data search
  98. IPN Triangulation of GRB 170816A (short/hard)
  99. LIGO/Virgo G297595: Swift-XRT sources
  100. GRB 170810A: VLA Detection

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