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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. Fermi GBM Sub-Threshold Detection of GRB 201015A
  2. GRB 201015A: Swift/UVOT Detection
  3. GRB 201015A: Swift-XRT refined Analysis
  4. MAGIC observations of GRB 201015A: hint of very high energy gamma-ray signal
  5. GRB 201015A: Swift-BAT refined analysis (a soft short pulse with a tail emission)
  6. GRB 201014A: Nanshan/NEXT optical observations
  7. GRB 201014A: Lowell Discovery Telescope afterglow imaging
  8. Konus-Wind observation of GRB 201013A
  9. GRB 201008A: Swift-XRT afterglow detection
  10. GRB 201015A: Enhanced Swift-XRT position
  11. GRB 201015A: BOOTES-1 early optical afterglow detection
  12. GRB 201014A: Swift/UVOT Upper Limits
  13. GRB 201015A: GOTO confirmation of afterglow detection
  14. GRB 201014A: Swift-XRT refined Analysis
  15. GRB 201015A: Swift-XRT observations
  16. Swift GRB 201015A: Global MASTER-Net observations report
  17. Swift GRB201015.95: Global MASTER-Net OT detection
  18. GRB 201015A: Swift detection of a burst
  19. GRB 201014A: BOOTES-1 and -2 early optical upper limits
  20. GRB 201014A: Swift-BAT refined analysis
  21. GRB 201014A (Swift trigger =1000255): CrAO/ZTSH optical afterglow discovery
  22. Swift-BAT trigger 1000255: XRT afterglow detection of GRB 201014A
  23. GRB 201013A: Insight-HXMT/HE detection
  24. Swift Trigger 1000255 is probably not a GRB
  25. GRB 201013A: TSHAO and AbAO optical observations, afterglow confirmation
  26. GRB 201013A: AstroSat CZTI detection
  27. GRB 201013A: CALET Gamma-Ray Burst Monitor detection
  28. GRB 201013A: Swift-BAT refined analysis
  29. GRB 201013A: Swift/UVOT Upper Limits
  30. Swift GRB 201013A: Global MASTER-Net observations report
  31. GRB 201013A: Swift-XRT refined Analysis
  32. SGR 1830-0645: Swift/UVOT Upper Limits
  33. GRB 201013A: Enhanced Swift-XRT position
  34. GRB 201013A: Swift detection of a burst
  35. SGR 1830-0645: pre-discovery detection in Swift/BAT
  36. SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
  37. SGR 1830-0645: Swift-BAT refined analysis
  38. GRB 201006A: Chandra upper limit on the X-ray afterglow
  39. SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
  40. GRB 201010A: Enhanced Swift-XRT position
  41. Swift GRB201010.62: Global MASTER-Net observations report
  42. Swift detection of a new SGR 1830-0645 or a short GRB 201010A
  43. GRB 201008A: Swift-XRT observations
  44. GRB 201008A: Swift ToO observations
  45. GRB 201008A: Swift/BAT-GUANO detection and possible arcminute localization
  46. Swift-XRT observations of IceCube 201007A
  47. GRB 201006A: GROWTH-India Telescope optical upper limit
  48. GRB 201006A: Lowell Discovery Telescope upper limits
  49. GRB 201006A: MITSuME Akeno optical upper limits
  50. GRB 201006A: Swift-XRT refined Analysis
  51. GRB 201006A: Swift-BAT refined analysis
  52. GRB 201006A: Swift/UVOT Upper Limits
  53. GRB 201006A: Fermi GBM detection
  54. GRB 201006A is likely a short burst
  55. GRB 201006A: Enhanced Swift-XRT position
  56. INTEGRAL sub-threshold detection of GRB 201006A
  57. GRB 201006A: Swift detection of a burst
  58. Swift GRB201006.05: Global MASTER-Net observations report
  59. GRB 201001A: Swift/UVOT Upper Limits
  60. GRB 201001A: TSHAO optical upper limit
  61. GRB 201001A: MITSuME Akeno optical upper limits
  62. GRB 201001A: Swift-BAT refined analysis
  63. GRB 201001A: Swift-XRT refined Analysis
  64. GRB 201001A: Fermi GBM observation
  65. Swift-XRT observations of IceCube 200929A
  66. GRB 201001A: Enhanced Swift-XRT position
  67. GRB 201001A: Swift detection of a burst
  68. Swift-XRT observations of IceCube 200926A
  69. GRB 200925B: Swift-XRT refined analysis update
  70. GRB 200925B: Swift-XRT refined Analysis
  71. GRB 200925B: Swift/UVOT Detection
  72. GRB 200925B: Swift-BAT refined analysis
  73. GRB 200925B: Enhanced Swift-XRT position
  74. Swift GRB 200925B: Global MASTER-Net OT detection
  75. GRB 200925B: OSN Afterglow Candidate Discovery
  76. GRB 200925B: Prompt enhanced Swift-XRT position
  77. GRB 200925B: Swift detection of a burst
  78. Swift GRB200925.91: Global MASTER-Net observations report
  79. GRB 200922A: chance superposition between optical afterglow and archival star
  80. GRB 200922A: Insight-HXMT/HE detection
  81. GRB 200922A: Swift-BAT refined analysis
  82. Improved enhanced Swift-XRT position of GRB 200922A
  83. GRB 200922A: Swift/UVOT Detection
  84. Swift GRB 200922A: Global MASTER-Net observations report
  85. GRB 200922A: Swift-XRT refined Analysis
  86. GRB 200917A: Swift/UVOT Upper Limits
  87. GRB 200922A: Enhanced Swift-XRT position
  88. GRB 200922A: Swift detection of a burst with possible optical counterpart
  89. GRB 200914A: Swift-XRT further observations
  90. GRB 200919A: Swift-BAT refined analysis
  91. Swift GRB200919.08: Global MASTER-Net observations report
  92. GRB 200919A: Swift detection of a burst
  93. GRB 200917A: GROWTH-India Telescope optical upper limit.
  94. Swift-XRT observations of IceCube 200916A
  95. GRB 200917A: Swift-BAT refined analysis
  96. Fermi-GBM Sub-Threshold Detection of GRB 200917A
  97. GRB 200917A: Swift-XRT refined Analysis
  98. Swift GRB 200917A: Global MASTER-Net observations report
  99. IPN triangulation of GRB 200916B (short)
  100. GRB 200917A: Enhanced Swift-XRT position

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