Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

19670 results found.

  1. GRB 191130A, a long burst detected in Swift-BAT ground analysis
  2. GRB 191004A: correction to reported GROND upper limits
  3. LIGO/Virgo S191129u: Swift/BAT in SAA
  4. GRB 191123A: Swift/UVOT further analysis
  5. GRB 191123A: Swift-BAT refined analysis
  6. GRB 191123A: Swift-XRT refined Analysis
  7. GRB 191123A: Enhanced Swift-XRT position
  8. GRB 191123A: Swift/UVOT detection
  9. GRB 191123A: Swift detection of a burst with an optical counterpart
  10. GRB 191122A: Swift/UVOT Upper Limits
  11. GRB 191122A: Swift-BAT refined analysis
  12. GRB 191122A: Swift-XRT refined Analysis
  13. GRB 191122A: BOOTES-4/MET optical limit
  14. GRB 191122A: Enhanced Swift-XRT position
  15. GRB 191122A: Prompt enhanced Swift-XRT position
  16. GRB 191122A: Swift detection of a burst
  17. Swift Trigger 937114 is not an astrophysical source
  18. Swift GRB191115A: Global MASTER-Net observations report
  19. Announcing the GW Treasure Map
  20. GRB 191031D: CALET Gamma-Ray Burst Monitor detection
  21. LIGO/Virgo S191110af: Swift XRT observations, no secure afterglow found
  22. LIGO/Virgo S191110af: no counterpart candidates in the Swift/BAT observations
  23. LIGO/Virgo S191109d: no counterpart candidates in the Swift/BAT observations
  24. GRB 191106A: AstroSat CZTI detection
  25. GRB 191106A: Swift/UVOT Upper Limits
  26. GRB 191106A: Swift-BAT refined analysis
  27. LIGO/Virgo S191105e: no counterpart candidates in the Swift/BAT observations
  28. GRB 191106A: Swift-XRT refined Analysis
  29. GRB 191106A: BOOTES-4/MET optical limit
  30. GRB 191106A: MASTER optical observation
  31. GRB 191106A: Swift detection of a burst
  32. GRB191016A GROND observations
  33. Swift trigger 933276 MASTER observation
  34. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  35. Swift GRB191105.01: Global MASTER-Net observations report
  36. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  37. Swift GRB191105.01: Global MASTER-Net OT detection
  38. GRB 191101A: Swift-BAT refined analysis
  39. GRB 191101A: Swift/UVOT Upper Limits
  40. SGR 1935+2154: Swift-BAT refined analysis
  41. GRB 191104B/GRB 191104C are SGR 1935+2154
  42. Trigger 933083: Swift detection of SGR 1935+2154
  43. GRB 191031D: Zwicky Transient Facility Follow-Up of a Swift Short GRB (Trigger 594249816/191031891)
  44. GRB 191031C: Insight-HXMT/HE detection
  45. GRB 191101A: Swift-XRT refined Analysis
  46. GRB 191101A: VIRT Optical Upper Limits
  47. GRB 191101A: Enhanced Swift-XRT position
  48. Swift GRB191101.88: Global MASTER-Net observations report
  49. GRB 191101A: Prompt enhanced Swift-XRT position
  50. GRB 191101A: Swift detection of a burst
  51. GRB 191031D: Swift-BAT refined analysis
  52. GRB 191031C: Swift-BAT refined analysis
  53. GRB 191031A: Swift-BAT refined analysis
  54. GRB 191031C: Swift-XRT refined Analysis
  55. GRB 191031D: AstroSat CZTI detection
  56. GRB 191031D: Swift/UVOT Upper Limits
  57. GRB 191031C: Swift/UVOT Detection
  58. Konus-Wind observation of GRB 191031D
  59. GRB 191031D: Swift-XRT refined Analysis
  60. GRB 191031D: AGILE/MCAL observations
  61. GRB 191031D: RATIR Optical and NIR Observations
  62. GRB 191031C: Fermi GBM detection
  63. GRB 191031D: Fermi GBM detection
  64. GRB 191031D: Enhanced Swift-XRT position
  65. GRB 191031A: Fermi GBM detection
  66. GRB 191031C: Enhanced Swift-XRT position
  67. Swift GRB191031.89: Global MASTER-Net observations report
  68. GRB 191031D: Swift detection of a short hard burst
  69. GRB 191029A: Swift-BAT refined analysis
  70. GRB 191031C: Prompt enhanced Swift-XRT position
  71. GRB 191031C: Swift detection of a burst
  72. GRB 191031A: Swift detection of a burst
  73. GRB 191029A: CORRECTED Swift-XRT refined analysis
  74. GRB 191029A: Swift/UVOT Upper Limits
  75. GRB 191029A: Enhanced Swift-XRT position
  76. GRB 191029A: Swift-XRT refined Analysis
  77. GRB 191029A: BOOTES-4/MET optical limit
  78. GRB 191029A: Swift-XRT observations
  79. GRB 191029A: Swift detection of a burst
  80. IPN triangulation of GRB 191027A
  81. Swift/BAT Trigger 931384 is not a GRB ( 191025A )
  82. Swift Trigger 931484 is not a GRB
  83. Possible GRB 191025A: FRAM-Auger optical limit
  84. Swift Trigger 931384: possible GRB 191025A
  85. GRB 191024A: Swift-BAT refined analysis
  86. GRB 191024A: Swift/UVOT Upper Limits
  87. GRB 191024A: Afterglow Upper Limits with LCO
  88. GRB 191024A: Swift-XRT refined Analysis
  89. GRB 191024A: GROND early upper limits
  90. GRB191024A: MASTER optical observation
  91. GRB 191024A: Enhanced Swift-XRT position
  92. GRB 191024A: Swift detection of a burst
  93. Swift GRB191020.89: Global MASTER-Net OT detection
  94. GRB 191019A: Swift/UVOT Detection
  95. HAWC-191019A: No Neutrino Counterpart detected with ANTARES
  96. GRB 191019A: Swift-XRT updated analysis
  97. Swift GRB191020.81: Global MASTER-Net OT detection
  98. GRB 191019A: Swift-BAT refined analysis
  99. GRB 191019A: Swift-XRT refined Analysis
  100. Swift GRB191019.67: Global MASTER-Net observations report

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov