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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"

27309 results found.

  1. SGR 1935+2154: Swift-BAT refined analysis
  2. Fermi trigger No 594563923: Global MASTER-Net observations report
  3. Fermi trigger No 594557071: Global MASTER-Net observations report
  4. GRB 191104C: BALROG localization (Fermi Trigger 594557071 / GRB 191104448)
  5. GRB 191104C: Fermi GBM Final Real-time Localization
  6. Fermi trigger No 594551878: Global MASTER-Net observations report
  7. Fermi trigger No 594528816: Global MASTER-Net observations report
  8. GRB 191104B: Fermi GBM Final Real-time Localization
  9. Trigger 933083: Swift detection of SGR 1935+2154
  10. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  11. GRB 191104A: Fermi GBM Final Real-time Localization
  12. GRB 191031D: Zwicky Transient Facility Follow-Up of a Swift Short GRB (Trigger 594249816/191031891)
  13. GRB 191031E: Insight-HXMT/HE detection
  14. GRB 191031C: Insight-HXMT/HE detection
  15. GRB 191101A: iTelescope optical limit
  16. GRB 191101A: Swift-XRT refined Analysis
  17. Baksan Neutrino Observatory Alert 191102.06: Global MASTER-Net observations report
  18. Fermi trigger No 594336535: Global MASTER-Net observations report
  19. Swift GRB191101.88: Global MASTER-Net observations report
  20. Fermi trigger No 594227699: Global MASTER-Net observations report
  21. GRB 191101B: Fermi GBM Final Real-time Localization
  22. GRB 191101A: Swift detection of a burst
  23. GRB 191031D: Swift-BAT refined analysis
  24. GRB 191031C: Swift-BAT refined analysis
  25. GRB 191031A: Swift-BAT refined analysis
  26. GRB 191031C: Swift-XRT refined Analysis
  27. GRB 191031D: Swift/UVOT Upper Limits
  28. GRB 191031C: Swift/UVOT Detection
  29. GRB 191031D: Swift-XRT refined Analysis
  30. GRB 191031D: COATLI Optical Observations
  31. GRB 191031D: RATIR Optical and NIR Observations
  32. GRB 191031C: Fermi GBM detection
  33. GRB 191031D: Fermi GBM detection
  34. GRB 191031A: Fermi GBM detection
  35. Correction in name: GRB 191031D (not GRB 191031C)
  36. Swift GRB191031.89: Global MASTER-Net observations report
  37. GRB 191031D: Swift detection of a short hard burst
  38. GRB 191031C: Fermi GBM Final Real-time Localization
  39. GRB 191029A: Swift-BAT refined analysis
  40. GRB 191031C: Swift detection of a burst
  41. GRB 191031C: Fermi GBM Final Real-time Localization
  42. Fermi trigger No 594175000: Global MASTER-Net observations report
  43. GRB 191031B: Fermi GBM Final Real-time Localization
  44. GRB 191031A: COATLI Optical Observations
  45. GRB 191031A: Fermi GBM Final Real-time Localization
  46. GRB 191031A: Swift detection of a burst
  47. GRB 191029A: CORRECTED Swift-XRT refined analysis
  48. GRB 191019A: Zadko Telescope optical observations
  49. GRB 191029A: Swift/UVOT Upper Limits
  50. Correction to GCN 26079 regarding GRB 191027A
  51. GRB 191029A: Swift-XRT refined Analysis
  52. GRB 191028B: MASTER optical observation
  53. GRB 191029A: BOOTES-4/MET optical limit
  54. GRB 191029A: iTelescope optical upper limits
  55. GRB 191029A: Swift-XRT observations
  56. GRB 191029A: Swift detection of a burst
  57. IPN triangulation of GRB 191027A
  58. GRB 191028B: BALROG localization (Fermi Trigger 593964489 / GRB 191028589)
  59. GRB 191028B: Fermi GBM Final Real-time Localization
  60. Fermi GBM trigger 593931926/191028212 is not a GRB
  61. GRB 191028A: Fermi GBM Final Real-time Localization
  62. GRB 191025B: Insight-HXMT/HE detection
  63. Swift/BAT Trigger 931384 is not a GRB ( 191025A )
  64. GRB 191027A: BALROG localization (Fermi Trigger 593882352 / GRB 191027638)
  65. GRB 191027A: Fermi GBM Final Real-time Localization
  66. GRB 191026A: Fermi GBM Final Real-time Localization
  67. Swift Trigger 931484 is not a GRB
  68. GRB 191023A: MASTER optical observation
  69. Possible GRB 191025A: FRAM-Auger optical limit
  70. Swift Trigger 931384: possible GRB 191025A
  71. GRB 191024A: Swift-BAT refined analysis
  72. GRB 191024A: Swift/UVOT Upper Limits
  73. GRB 191024A: Afterglow Upper Limits with LCO
  74. GRB 191024A: Swift-XRT refined Analysis
  75. GRB 191024A: VLT/X-shooter optical observations
  76. GRB 191024A: GROND early upper limits
  77. GRB191024A: MASTER optical observation
  78. GRB 191024A: Swift detection of a burst
  79. GRB 191023A: BALROG localization (Fermi Trigger 593536021 / GRB 191023630)
  80. GRB 191023A: Fermi GBM Final Real-time Localization
  81. GRB 191019A: Nanshan-0.6m optical observations
  82. GRB 191022B: Fermi GBM Final Real-time Localization
  83. GRB 191022A: BALROG localization (Fermi Trigger 593419810 / GRB 191022285)
  84. GRB 191022A: Fermi GBM Final Real-time Localization
  85. GRB 191019A: Swift/UVOT Detection
  86. HAWC-191019A: Retraction of burst alert
  87. GRB 191019A: Swift-XRT updated analysis
  88. Swift GRB191020.81: Global MASTER-Net OT detection
  89. GRB 191019A: Swift-BAT refined analysis
  90. GRB 191019A: Swift-XRT refined Analysis
  91. Swift GRB191019.67: Global MASTER-Net observations report
  92. GRB 191019A: GROND observations
  93. GRB 191019B: Fermi GBM Final Real-time Localization
  94. GRB 191019A: NOT optical observations
  95. Fermi trigger No 593176520: Global MASTER-Net observations report
  96. Alert from the HAWC Burst Monitor HAWC-191019A
  97. GRB 191019A: TSHAO optical observations, probable afterglow and host galaxy
  98. GRB 191019A: Swift-XRT observations
  99. Swift GRB191019.63: Global MASTER-Net observations report
  100. GRB 191019A: Swift detection of a burst

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