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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 190829A: KAIT Detection of the Optical Afterglow
  2. GRB 190829A, Swift-BAT refined analysis
  3. GRB 190829A: AGILE-GRID upper limits
  4. GRB 190829A: AGILE ratemeters detection and MCAL upper limits
  5. GRB 190829A: Fermi GBM detection
  6. GRB 190829A: Fermi-LAT Upper Limits
  7. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  8. GRB 190829A: Swift/UVOT detection of an optical afterglow with a rise
  9. GRB 190829A: GROND detection of the Optical/NIR Afterglow
  10. GRB 190829A: Swift-XRT refined Analysis
  11. GRB 190829A: Enhanced Swift-XRT position
  12. GRB 190829A: 10.4m GTC spectroscopy
  13. GRB 190829A: NOT optical afterglow detection and spectroscopy
  14. GRB 190829A:: MASTER-net bright and decay OT detection
  15. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  16. GRB 190828B: VLT/X-shooter optical afterglow candidate
  17. GRB 190828B: Swift-XRT refined Analysis
  18. LIGO/Virgo S190814bv: Swift observation of ASKAP J005547-270433/AT2019osy
  19. GRB 190828B: Swift/UVOT Upper Limits
  20. GRB 190828A: Swift-XRT observations
  21. GRB 190823A: AstroSat CZTI detection
  22. GRB 190828B: Fermi GBM observation
  23. GRB 190828B: Swift-BAT refined analysis
  24. LIGO/Virgo S190828l: no counterpart candidates in the Swift/BAT Observations
  25. LIGO/Virgo S190828j: no counterpart candidates in the Swift/BAT Observations
  26. GRB 190828A: Tiled Swift observations
  27. LIGO/Virgo S190814bv: Swift UVOT - no new counterpart candidates identified
  28. GRB 190828B: Enhanced Swift-XRT position
  29. Swift GRB190828.54 Global MASTER-Net observations report
  30. GRB 190828B: Swift detection of a burst
  31. GRB 190824A, Swift-BAT refined analysis
  32. GRB 190824A: Swift/UVOT Upper Limits
  33. GRB 190823A: Swift-XRT observations
  34. GRB 190816A: Swift-XRT afterglow detection
  35. GRB 190824A: Swift-XRT refined Analysis
  36. GRB 190824A: Fermi GBM observation
  37. GRB 190824A: Enhanced Swift-XRT position
  38. GRB 190821A: Swift-BAT refined analysis
  39. GRB 190824A: Swift detection of a burst
  40. GRB 190823A: Tiled Swift observations
  41. GRB 190821A: Swift/UVOT Upper Limits
  42. GRB 190821A: MASTER VWFC syncronous optical observations
  43. GRB 190821A: Swift-XRT refined Analysis
  44. GRB 190821A: Enhanced Swift-XRT position
  45. GRB 190821A: Fermi GBM observation
  46. Fermi GBM-190816: Upper Limits from Swift/BAT Observations
  47. GRB 190821A: MASTER do not see any afterglow candidate
  48. GRB 190821A: T60 Les Makes optical detection of the afterglow
  49. Swift GRB190821.72 Global MASTER-Net observations report
  50. GRB 190821A: Swift detection of a burst
  51. LIGO/Virgo GBM-190816: no counterpart candidates in the Swift/BAT Observations
  52. IceCube-190819A: MASTER analysis
  53. GRB 190816A: Swift-BAT refined analysis
  54. LIGO/Virgo S190814bv: No strong counterpart candidates in Swift/XRT observations
  55. GRB 190816A: Swift-XRT observations
  56. GRB 190816A: Swift detection of a burst
  57. LIGO/Virgo S190814bv: no counterpart candidates in Thacher imaging
  58. LIGO/Virgo S190814bv: No counterpart candidates in the Swift/BAT Observations
  59. IPN triangulation of GRB 190805B
  60. IPN triangulation of GRB 190810A (short)
  61. HAWC-190806A: Swift-XRT observations
  62. Correction to Swift GCN 25303
  63. Trigger_11505: Tiled Swift observations
  64. GRB 190805B: AstroSat CZTI detection
  65. GRB 190804B: Swift-XRT afterglow detection
  66. GRB 190805B: Swift-XRT observations
  67. GRB 190805B: Tiled Swift observations
  68. GRB 190804B: Swift-XRT observations
  69. GRB 190804B: Tiled Swift observations
  70. GRB 190731A: AstroSat CZTI detection
  71. GRB 190731A: Swift/UVOT Upper Limits
  72. GRB 190731A: no OT detected by MASTER
  73. GRB 190731A: Swift-XRT afterglow detection
  74. IPN Triangulation of GRB 190731A
  75. GRB 190731A: Swift ToO observations
  76. GRB190731A: Fermi-LAT detection
  77. LIGO/Virgo S190728q/IceCube neutrino candidate: No counterpart candidates in the Swift-XRT Observations
  78. Konus-Wind observation of GRB 190727B
  79. GRB 190727B: Swift-BAT refined analysis
  80. LIGO/Virgo S190728q: No counterpart candidates in the Swift/BAT Observations
  81. GRB 190727B: Fermi-LAT detection
  82. GRB 190727B: Fermi GBM observations
  83. GRB 190727B: Swift detection of a burst
  84. LIGO/Virgo S190727h: No counterpart candidates in the Swift/BAT Observations
  85. LIGO/Virgo S190718y: Swift XRT observations, 45 X-ray sources
  86. LIGO/Virgo S190720a: Thacher Observatory follow-up observations
  87. GRB 190719C: Fermi GBM detection
  88. GRB 190719C: Swift-BAT refined analysis
  89. GRB 190719C: Swift/UVOT Upper Limits
  90. LIGO/Virgo S190720a: No counterpart candidates in the Swift/BAT Observations
  91. GRB 190719C: Swift-XRT light-curve fit
  92. GRB 190719C: Swift-XRT refined Analysis
  93. GRB 190719C: NOT candidate optical afterglow and host
  94. GRB 190719C: Swift detection of a burst
  95. GRB 190718A: Swift-BAT refined analysis
  96. LIGO/Virgo S190718y: No counterpart candidates in the Swift/BAT Observations
  97. GRB 190718A: Swift-XRT refined Analysis
  98. GRB 190718A: Swift/UVOT Upper Limits
  99. GRB 190718A: FRAM-Auger optical limit
  100. GRB 190718A: Enhanced Swift-XRT position

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