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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"

19662 results found.

  1. GRB 181126A: Fermi GBM observation
  2. GRB 181126A: Enhanced Swift-XRT position
  3. GRB 181126A: Prompt enhanced Swift-XRT position
  4. GRB 181126A: Swift detection of a burst
  5. GRB 181123B: Insight-HXMT/HE detection
  6. GRB 181125A: Fermi GBM observation
  7. GRB 181125A: Swift-BAT refined analysis
  8. GRB 181125A: Swift detection of a burst
  9. Swift J1858.6-0814/GRB 181123A: Swift/BAT location correction to GCN 23442
  10. Swift trigger 873178: GRB 181123A is Swift J1858.6-0814
  11. GRB 181123B: Global MASTER Net optical inspection
  12. GRB 181123B: Swift-BAT lag analysis and search for extended emission
  13. GRB 181123A, Swift-BAT refined analysis
  14. GRB 181123B: Swift/UVOT Upper Limits
  15. GRB 181020A: AstroSat CZTI detection
  16. GRB 181123B: Swift-XRT refined Analysis
  17. GRB 181123B: Enhanced Swift-XRT position
  18. GRB 181123B: Prompt enhanced Swift-XRT position
  19. GRB 181123B: Swift detection of a short burst
  20. GRB 181123A: Swift detection of a burst
  21. GRB 181120A: Fermi-LAT detection
  22. Swift Trigger 872470: further Swift analysis
  23. Swift Trigger 872470 is probably not a GRB
  24. Konus-Wind observation of GRB 181110A
  25. GROND observations of GRB181110A
  26. GRB 181110A, Swift-BAT refined analysis
  27. GRB 181110A: Swift/UVOT Detection
  28. GRB 181110A: Swift-XRT refined Analysis
  29. GRB 181110A: Enhanced Swift-XRT position
  30. GRB 181110A: MITSuME Akeno optical observation
  31. GRB 181110A: Kanata 1.5m optical observation
  32. GRB 181110A: Swift detection of a burst with an optical counterpart
  33. Swift Trigger 871103 is not an astrophysical event
  34. GRB 181103A: AbAO optical upper limit
  35. GRB 181103A: Swift/UVOT Detection
  36. GRB 181103A: Nanshan-1m optical upper limit
  37. GRB 181103A: Swift-BAT refined analysis
  38. GRB 181103A: Swift-XRT refined Analysis
  39. GRB 181103A: Enhanced Swift-XRT position
  40. GRB 181103A: Swift detection of a burst
  41. GRB 181030A: Swift/UVOT Detection
  42. GRB 181030A, Swift-BAT refined analysis
  43. GRB 181030A: Swift-XRT refined Analysis
  44. GRB 181030A: MASTER Net OT detection
  45. GRB 181030A: Enhanced Swift-XRT position
  46. GRB 181030A: SAO RAS optical observations
  47. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  48. GRB 181027A: Fermi GBM detection
  49. GRB 181027A: Swift-BAT refined analysis
  50. GRB 181027A: Swift detection of a burst
  51. GRB 181023A: Swift-BAT refined analysis
  52. GRB 181023A: Swift/UVOT Upper Limits
  53. GRB 181022A: Swift-XRT refined Analysis
  54. GRB 181023A: Swift-XRT refined Analysis
  55. GRB 181022A: GROND upper limits
  56. GRB 181022A: LCO Sutherland observations
  57. GRB 181023A: Enhanced Swift-XRT position
  58. GRB 181023A: KAIT Optical Upper Limit
  59. GRB 181022A: Swift/UVOT Upper Limits
  60. GRB 181023A: Swift detection of a burst
  61. GRB 181022A: Swift-BAT refined analysis
  62. GRB 181022A: Swift detection of a burst
  63. Konus-Wind observation of GRB 181020A
  64. GRB 181020A: Swift/UVOT Detection
  65. GRB 181020A: Global MASTER Net OT observations
  66. GRB 181020A: LCO Cerro Tololo observations
  67. GRB 181020A: Swift-BAT refined analysis
  68. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  69. GRB 181020A: Swift-XRT refined Analysis
  70. GRB 181020A: Fermi GBM detection
  71. GRB 181020A: Enhanced Swift-XRT position
  72. GRB 181020A: Fermi-LAT detection
  73. GRB 181020A: Swift detection of a burst with an optical counterpart
  74. Trigger 867343: Swift detection of SGR1806-20
  75. GRB 181016A: Swift-BAT refined analysis
  76. GRB 181016A: Swift detection of a burst
  77. GRB 181013A: AbAO optical upper limit
  78. Trigger 866993: Swift detection of SGR1806-20
  79. GRB 181013A: Swift/UVOT Upper Limits
  80. GRB 181013A: Swift-BAT refined analysis
  81. GRB 181013A: Swift-XRT afterglow detection
  82. GRB 181013A: Global MASTER Net optical observations
  83. GRB 181013A: Swift detection of a probable burst
  84. Swift Trigger 866757: is probably not a GRB
  85. GROND afterglow detection of GRB 181010A
  86. GRB 181010A: Swift-BAT refined analysis
  87. GRB 181010A: Fermi GBM observation
  88. IPN Triangulation of GRB 181008B (long)
  89. GRB 181010A: Swift/UVOT Detection
  90. GRB 181010A: Swift-XRT refined Analysis
  91. GRB 181010A: Enhanced Swift-XRT position
  92. GRB 181010A: LCO Cerro Tololo observations
  93. GRB 181010A: MASTER-Argentina OT detection
  94. GRB 181010A: Swift detection of a burst with an optical counterpart
  95. GRB 181002A: Mondy optical upper limit
  96. GRB 181003A: RATIR Optical and NIR Observations
  97. GRB 181003A: Swift-BAT refined analysis
  98. GRB 181003A: Swift-XRT afterglow detection
  99. GRB 180925A: Astrosat CZTI detection
  100. GRB 181003A: Swift/UVOT Upper Limits

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