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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. Konus-Wind observation of ultra-long GRB 200612A
  2. GRB 200612A: Enhanced Swift-XRT position
  3. GRB 200612A: BOOTES-3/YA optical upper limit
  4. Swift GRB200612.19: Global MASTER-Net OT detection
  5. Swift GRB200612.19: Global MASTER-Net observations report
  6. GRB 200612A: Swift detection of a burst
  7. GRB 200608A: Swift-BAT refined analysis
  8. Swift GRB 200608A: Global MASTER-Net observations report
  9. GRB 200608A: BOOTES-3 and BOOTES-4 optical upper limit
  10. GRB 200608A: Swift detection of a burst
  11. IPN triangulation of GRB 200605A (short)
  12. Correction to the GCN 27886: Previous bursts of 1RXS J1708-4009 (Swift trigger 975998)
  13. 1RXS J1708−4009: Swift-BAT refined analysis
  14. Swift detection of an SGR-like burst from 1RXS J1708−4009
  15. GRB 200529A: Swift/UVOT Upper Limits
  16. Konus-Wind observation of GRB200528A
  17. GRB 200529A: Swift-BAT refined analysis
  18. GRB 200529A: Swift-XRT refined Analysis
  19. GRB 200528A: CAHA Upper Limit
  20. GRB 200529A: Fermi GBM Detection
  21. GRB 200529A: LCO Optical Afterglow Detection
  22. GRB 200528A: CALET Gamma-Ray Burst Monitor detection
  23. GRB 200529A: BOOTES-2/TELMA early optical upper limit
  24. GRB 200528A: Swift-XRT refined Analysis
  25. GRB 200528A: Assy optical upper limit
  26. GRB 200529A: Enhanced Swift-XRT position
  27. GRB 200529A: KAIT Optical Afterglow Confirmation
  28. GRB 200529A: Swift detection of a burst
  29. Swift GRB200529.04: Global MASTER-Net observations report
  30. GRB 200528A: Fermi GBM Observation
  31. GRB 200528A: Swift/UVOT Upper Limits
  32. GRB 200528A: Swift-BAT refined analysis
  33. GRB 200528A: 1.3m DFOT Optical Upper Limits
  34. GRB 200528A: Enhanced Swift-XRT position
  35. Swift GRB 200528A: Global MASTER-Net observations report
  36. GRB 200528A: MITSuME Akeno optical upper limits
  37. GRB 200528A: Swift detection of a burst
  38. GRB200524A: UVOT detection
  39. GRB 200524A: optical upper limits from further MITSuME Akeno observation
  40. GRB 200522A: Gemini North optical imaging
  41. GRB 200524A: AstroSat CZTI detection
  42. GRB 200524A: MITSuME Akeno optical observation
  43. GRB 200524A: Swift-XRT afterglow detection
  44. GRB 200524A: Fermi GBM detection
  45. GRB 200524: Swift/UVOT observations missed the ZTF20abbiixp position
  46. GRB 200524A: Swift ToO observations
  47. GRB 200524A: Fermi-LAT detection
  48. GRB 200522A: Swift-BAT refined analysis
  49. GRB 200522A: LCO Optical Afterglow Detection
  50. Swift GRB 200522A: Global MASTER-Net observations report
  51. GRB 200522A: Swift-XRT refined Analysis
  52. GRB 200522A: BOOTES-3/YA optical upper limit
  53. GRB 200522A: Swift/UVOT Upper Limits
  54. GRB 200522A: Enhanced Swift-XRT position
  55. GRB 200522A: Coincident catalogued galaxy at z~0.4
  56. GRB 200522A: Swift detection of a short burst
  57. GRB 200517A: Swift-XRT Confirmation of afterglow
  58. GRB 200519A: CALET Gamma-Ray Burst Monitor detection
  59. GRB 200519A: Swift-BAT refined analysis
  60. GRB 200519A: Insight-HXMT/HE detection
  61. GRB 200519A: Swift/UVOT Detection
  62. GRB 200519A: AstroSat CZTI detection
  63. Swift GRB 200519A: Global MASTER-Net observations report
  64. GRB 200519A: 1.3m DFOT Optical Afterglow Detection
  65. GRB 200519A: Swift-XRT refined Analysis
  66. GRB 200519A: Enhanced Swift-XRT position
  67. GRB 200519A: BOOTES-3/YA optical counterpart observations
  68. GRB 200519A: LCO Optical Afterglow Detection
  69. GRB 200519A: Swift detection of a burst with an optical afterglow
  70. GRB 200517A: Swift-XRT afterglow detection
  71. GRB 200517A: Tiled Swift observations
  72. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  73. Swift GRB200516.63: Global MASTER-Net observations report
  74. Swift Detection of a burst from SGR Swift J1818.0-1607
  75. GRB 200512A: Swift-BAT refined analysis
  76. GRB 200514A: MAXI/GSC detection
  77. GRB 200512A: LCO Optical Upper Limits
  78. Fermi GBM Sub-Threshold Detection of GRB 200512A
  79. GRB 200512A: Swift/UVOT Upper Limits
  80. GRB 200512A: Swift-XRT refined Analysis
  81. GRB 200512A: Enhanced Swift-XRT position
  82. GRB 200512A: Swift detection of a burst
  83. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  84. GRB 200509A: Swift-BAT refined analysis
  85. GRB 200509A: Swift/UVOT Detection
  86. Swift GRB 200509A: Global MASTER-Net observations report
  87. GRB 200509A: LCO Optical Afterglow Detection
  88. GRB 200509A: Swift-XRT refined Analysis
  89. GRB 200509A: Enhanced Swift-XRT position
  90. GRB 200509A: Zadko observatory - Gingin optical upper limits
  91. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  92. Swift Detection of a burst from SGR Swift J1818.0-1607
  93. Swift GRB200506.73: Global MASTER-Net observations report
  94. GRB 200424A: Swift-XRT afterglow detection
  95. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  96. Trigger 968731: Swift detection of SGR1806-20
  97. SGR 1935+2154: MASTER optical observations
  98. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  99. A Forest of Bursts from SGR 1935+2154
  100. high bursting activity of SGR 1935+2154: CGBM observations

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