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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"

19670 results found.

  1. IPN triangulation of GRB 200916B (short)
  2. GRB 200917A: Enhanced Swift-XRT position
  3. GRB 200917A: Swift detection of a burst
  4. Swift-XRT observations of IceCube 200911A
  5. GRB 200914A: AGILE detection
  6. GRB 200914A: Swift-XRT observations
  7. GRB 200914A: Swift ToO observations
  8. IPN triangulation of GRB 200907A (short)
  9. GRB 200909B: Swift-BAT refined analysis
  10. Swift GRB200909.97: Global MASTER-Net observations report
  11. GRB 200909B: Swift detection of a burst
  12. GRB 200907B: Swift/UVOT Upper Limits
  13. GRB 200907B: Swift-BAT refined analysis
  14. GRB 200907B: AstroSat CZTI detection
  15. GRB 200907B: Swift-XRT refined Analysis
  16. GRB 200907B: MITSuME Okayama optical upper limits
  17. Swift GRB 200907B: Global MASTER-Net observations report
  18. GRB 200907B: Enhanced Swift-XRT position
  19. Correction to GCN 28387: GRB 200907B GROWTH-India optical upper limit
  20. GRB200907A: GROWTH-India optical upper limit
  21. GRB 200907B: Prompt enhanced Swift-XRT position
  22. GRB 200907B: Swift detection of a short burst
  23. GRB 200906A: EMIR/GTC NIR upper limit
  24. GRB 200906A: LBT near-infrared upper limit
  25. GRB 200906A: Swift-BAT refined analysis
  26. GRB 200906A: Swift/UVOT Upper Limits
  27. GRB 200906A: GROWTH-India Telescope (GIT) optical r band upper limit
  28. GRB 200906A: OSN 1.5m Upper Limit
  29. GRB 200906A: Swift-XRT refined Analysis
  30. GRB 200906A: Fermi GBM detection
  31. GRB 200906A: Enhanced Swift-XRT position
  32. GRB 200906A: Swift detection of a burst
  33. Swift Triggers 994723-994725 and 994727 are not GRBs.
  34. GRB 200903A: Fermi GBM detection
  35. GRB 200903A: Swift-BAT refined analysis
  36. GRB 200903A: CALET Gamma-Ray Burst Monitor detection
  37. Swift GRB200903.03: Global MASTER-Net observations report
  38. GRB 200903A: Swift detection of a burst
  39. GRB 200901A: MASTER OT early detection
  40. GRB 200901B: Swift-XRT refined Analysis
  41. GRB 200901B: Swift-BAT refined analysis
  42. GRB 200901A: Swift-BAT refined analysis
  43. GRB 200901B: Swift/UVOT Detection
  44. GRB 200901A: Swift/UVOT Detection
  45. GRB 200901A: Swift-XRT refined Analysis
  46. GRB 200901A: Fermi GBM observation
  47. GRB 200901B: Enhanced Swift-XRT position
  48. GRB 200829A: Swift/UVOT-XRT photometric redshift
  49. GRB 200901B: Swift detection of a burst
  50. GRB 200901A: Swift-XRT observations
  51. GRB 200901A: Swift detection of a burst
  52. Swift GRB200901.16: Global MASTER-Net observations report
  53. GRB 200829A: Fermi GBM detection
  54. GRB 200829A: Swift-BAT refined analysis
  55. Konus-Wind detection of GRB 200829A (a clone of GRB 200826B?)
  56. GRB 200829A: Swift-XRT refined Analysis
  57. GRB200829A: optical afterglow detection
  58. GRB 200829A: Global MASTER-Net OT detection
  59. GRB 200829A: AGILE/MCAL detection
  60. GRB 200829A: Enhanced Swift-XRT position
  61. GRB 200829A: Swift/UVOT Detection
  62. Swift GRB 200829A: Global MASTER-Net observations report
  63. GRB 200829A: Swift detection of a burst with an optical afterglow
  64. GRB 200826A: VLA Detection at 6 GHz
  65. GRB 200826A: Swift-XRT afterglow detection
  66. GRB200826A: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi Short GRB (Trigger 620108997)
  67. GRB 200826A: Tiled Swift observations
  68. Swift Trigger 992444 is due to detector noise
  69. GRB 200819A: Swift/UVOT Upper Limits
  70. Swift GRB200821.55: Global MASTER-Net observations report
  71. Swift Trigger 992444: a possible GRB 200821A
  72. GRB 200819A: Swift-BAT refined analysis
  73. IPN triangulation of GRB 200815A (short)
  74. GRB 200819A: Swift-XRT refined Analysis
  75. GRB 200729A: Lowell Discovery Telescope observations
  76. GRB 200819A: MITSuME Akeno optical upper limits
  77. GRB 200819A / Swift J0125.7+6303: Ondrejov Perek-2m optical limit
  78. GRB 200819A: Enhanced Swift-XRT position
  79. Swift GRB 200819A: Global MASTER-Net observations report
  80. GRB 200819A: Swift detection of a burst
  81. Swift Trigger 990358 is due to detector noise
  82. Swift Trigger 989458 is due to detector noise
  83. Swift trigger 990358 is not an astrophysical source
  84. Swift GRB200816.17: Global MASTER-Net observations report
  85. Swift trigger 989458 is likely not an astrophysical source
  86. GRB 200809B: Fermi GBM detection
  87. GRB 200809B: BOOTES-3/YA optical upper limit
  88. GRB 200809B: Swift-XRT afterglow detection
  89. GRB 200809B: MAXI/GSC detection
  90. GRB 200809B: Swift ToO observations
  91. GRB 200809B: AstroSat CZTI detection
  92. GRB 200809B: Swift/BAT-GUANO detection and arcminute localization
  93. GRB 200806A: CALET Gamma-Ray Burst Monitor detection
  94. GRB 200806A: CAHA optical afterglow confirmation
  95. GRB 200806A: Swift-BAT refined analysis
  96. GRB 200806A: Swift/UVOT Possible Detection
  97. GRB 200806A: Swift-XRT refined Analysis
  98. GRB 200806A: AbAO optical upper limit
  99. GRB 200806A: AstroSat CZTI detection
  100. GRB 200806A: MITSuME Akeno optical upper limits

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