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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"

19666 results found.

  1. GRB 190604B: BOOTES-3 early optical limits
  2. GRB 190604B: Swift-XRT refined Analysis
  3. GRB190604B: Swift/UVOT detection
  4. GRB 190604B: Enhanced Swift-XRT position
  5. GRB 190604B: Prompt enhanced Swift-XRT position
  6. GRB 190604B: Swift detection of a burst
  7. GRB 190531B: Swift/UVOT Upper Limits
  8. LIGO/Virgo S190602aq: No counterpart candidates in the Swift/BAT Observations
  9. GRB 190531B: MASTER optical observation
  10. GRB 190531B: Swift-XRT afterglow detection
  11. GRB 190530A: Swift/UVOT Detection
  12. GRB 190531B: Swift ToO observations
  13. GRB 190530A: AstroSat CZTI detection
  14. GRB 190530A: Swift-XRT afterglow detection
  15. GRB 190530A: Swift ToO observations
  16. Konus-Wind observation of GRB 190519A
  17. LIGO/Virgo S190521g: Swift/BAT Counterpart Search
  18. LIGO/Virgo S190521r: Swift/BAT Counterpart Search
  19. GRB 190519A: Swift/UVOT Upper Limits
  20. GRB 190519A: CALET Gamma-Ray Burst Monitor detection
  21. LIGO/Virgo S190519bj: Swift/BAT Counterpart Search
  22. GRB 190519A: Swift-XRT refined Analysis
  23. GRB 190519A: Swift-BAT refined analysis
  24. GRB 190519A: Enhanced Swift-XRT position
  25. GRB 190519A: Fermi GBM observation
  26. GRB 190519A: Swift detection of a burst
  27. GRB 190511A: Swift/UVOT further analysis
  28. LIGO/Virgo S190517h: Swift/BAT Counterpart Search
  29. GRB 190515B: Swift/UVOT Upper Limits
  30. GRB 190515B: BOOTES-4/MET and 2.2m CAHA optical limits
  31. GRB 190515B: Swift-BAT refined analysis
  32. GRB 190515A: Insight-HXMT/HE detection
  33. GRB 190515B: Swift-XRT refined Analysis
  34. GRB 190515B: Enhanced Swift-XRT position
  35. GRB 190515B: Kitab Observatory optical upper limit
  36. Correction to GRB name for Swift trigger 903845
  37. GRB 190515B: Prompt enhanced Swift-XRT position
  38. GRB 190515B: Swift detection of a burst
  39. LIGO/Virgo S190513bm: Swift/BAT Counterpart Search
  40. LIGO/Virgo S190510g: Swift-XRT observations and results
  41. Konus-Wind observation of GRB 190511A
  42. GRB 190512A: Swift-BAT refined analysis
  43. LIGO/Virgo S190512at: Swift/BAT Counterpart Search
  44. GRB 190512A: Fermi GBM observation
  45. GRB 190511A: Swift-BAT refined analysis
  46. GRB 190512A: Swift detection of a burst
  47. GRB 190511A: Swift-XRT refined Analysis
  48. IPN triangulation of GRB 190510A (short)
  49. GRB 190511A: Swift/UVOT Detection
  50. GRB 190511A: NOT optical afterglow
  51. GRB 190511A: Fermi-LAT detection
  52. GRB 190511A: Fermi GBM observation
  53. GRB 190511A: Enhanced Swift-XRT position
  54. GRB 190511A: Swift detection of a burst
  55. LIGO/Virgo S190425z: CAHA-GRANDMA Observation of the Swift UVOT Source
  56. LIGO/Virgo S190510g: Swift/BAT Counterpart Search
  57. GRB 190501A: Swift XRT and UVOT Observations
  58. IceCube-190504A: MASTER optical monitoring analysis
  59. IceCube-190504A: Swift-XRT Follow-up Observations
  60. IceCube-190503A: Swift-XRT Follow-up Observations
  61. LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
  62. GRB 190501A: Swift ToO observations
  63. LIGO/Virgo S190426c: Swift rapid follow-up observations of S190425z and S190426c and URL for observation log for all future events
  64. LIGO/Virgo S190425z: 1.3-m optical imaging of UVOT transient field
  65. GRB 190427A: CALET Gamma-Ray Burst Monitor detection
  66. LIGO/Virgo S190425z: RATIR non-detection of the Swift/UVOT source
  67. LIGO/Virgo S190425z: VISTA K-band observations of the Swift/UVOT Transient
  68. GRB 190427A: Swift/UVOT Upper Limits
  69. GRB 190427A, Swift-BAT refined analysis
  70. LIGO/Virgo S190425z : IRSF/SIRIUS NIR photometric follow-up observation of the Swift/UVOT Transient
  71. LIGO/Virgo S190425z: MASTER explanation of the nature of an optical flash detected by a Swift as a short flare on a fast-moving WISE brown
  72. LIGO/Virgo S190425z: No i-band detection of the Swift/UVOT transient in SkyMapper observations
  73. LIGO/Virgo S190425z: 1.5m OSN and 10.4m imaging of the UVOT source field
  74. LIGO/Virgo S190425z: No Optical Detection of the Swift/UVOT Transient in ASAS-SN observations hours before and after discovery
  75. LIGO/Virgo S190425z: No Optical Detection of the Swift/UVOT Transient with Las Cumbres Observatory
  76. LIGO/Virgo S190425z: Pre-discovery NIR limits of the UVOT transient candidate from Gattini-IR
  77. LIGO/Virgo S190425z: Swift/UVOT and XRT pre-images at the position of the potential Swift/UVOT counterpart
  78. LIGO/Virgo S190425z: GROWTH-India observations of the Swift/UVOT transient
  79. Correction to GCN Circular 24301: LIGO/Virgo S190425z: Lulin observations of the Swift/UVOT transient
  80. LIGO/Virgo S190425z: ZTF photometry of the UVOT transient candidate hours before discovery
  81. LIGO/Virgo S190425z: Lulin observations of the Swift/UVOT transient
  82. LIGO/Virgo S190425z: Transient found in Swift/UVOT counterpart search
  83. GRB 190427A: Fermi GBM detection
  84. LIGO/Virgo S190426c: Swift-XRT sources
  85. GRB 190427A: NOT optical observations
  86. GRB 190427A: Swift-XRT observations
  87. Swift GRB190427.19 Global MASTER-Net observations report
  88. GRB 190427A: Swift detection of a short burst
  89. LIGO/Virgo S190426c: Swift/BAT Counterpart Search
  90. LIGO/Virgo S190425z: Swift/BAT Counterpart Search
  91. GRB 190424A: Swift-BAT refined analysis
  92. GRB 190424A: Swift detection of a burst
  93. GRB 190422A: Fermi GBM detection
  94. GRB 190422A: Swift/UVOT Upper Limits
  95. LIGO/Virgo S190421ar: Swift/BAT Counterpart Search
  96. GRB 190422A: Swift-BAT refined analysis
  97. GRB 190422A: Swift-XRT refined Analysis
  98. GRB 190422A: Enhanced Swift-XRT position
  99. Swift GRB190422.96 Global MASTER-Net observations report
  100. GRB 190422A: Swift detection of a burst

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