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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"

19663 results found.

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

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