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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"

11649 results found.

  1. Fermi GRB 200916A: Global MASTER-Net observations report
  2. GRB 200916A: Fermi GBM Final Real-time Localization
  3. Fermi trigger No 621893860: Global MASTER-Net observations report
  4. Fermi trigger No 621833240: Global MASTER-Net observations report
  5. Fermi GRB 200914A: Global MASTER-Net observations report
  6. GRB 200914A: AGILE detection
  7. GRB 200914A: Fermi GBM observation
  8. IceCube-200911A: No significant detection in HAWC
  9. Fermi-LAT Gamma-ray Observations of IceCube-200911A and detection of a new gamma-ray source, Fermi J0330.1+3743
  10. GRB 200914A: BALROG localization (Fermi Trigger 621780515 / GRB 200914534)
  11. GRB 200914A: Fermi GBM Final Real-time Localization
  12. IceCube-200911A: not observable by Fermi-GBM
  13. IceCube-200911A: IceCube observation of a high-energy neutrino candidate event
  14. GRB 200826A: uGMRT radio upper limit at 1.25 GHz
  15. GRB 200909A: AstroSat CZTI detection
  16. Fermi GRB 200909A: Global MASTER-Net observations report
  17. GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168)
  18. GRB 200909A: Fermi GBM Final Real-time Localization
  19. Fermi GRB 200908A: Global MASTER-Net observations report
  20. GRB 200908A: Fermi GBM Final Real-time Localization
  21. Fermi GRB 200907C: Global MASTER-Net observations report
  22. GRB 200907C: Fermi GBM Final Real-time Localization
  23. Fermi GRB 200906A: Global MASTER-Net observations report
  24. GRB 200906A: EMIR/GTC NIR upper limit
  25. GRB 200906A: OSN 1.5m Upper Limit
  26. GRB 200906A: Fermi GBM detection
  27. GRB 200906A: Fermi GBM Final Real-time Localization
  28. Fermi GRB 200904A: Global MASTER-Net observations report
  29. GRB 200904A: Fermi GBM Final Real-time Localization
  30. Fermi GRB 200903C: Global MASTER-Net observations report
  31. GRB 200903A: Fermi GBM detection
  32. GRB 200903C: Fermi GBM Final Real-time Localization
  33. GRB 200903B: Insight-HXMT/HE detection
  34. AGILE detection of a burst (AGILE trigger no. 526185273)
  35. Fermi GRB 200903B: Global MASTER-Net observations report
  36. GRB 200903B: Fermi GBM Final Real-time Localization
  37. GRB 200903A: Fermi GBM Final Real-time Localization
  38. GRB 200901A: Fermi GBM observation
  39. Fermi GBM trigger 620564765/200831463 is not a GRB
  40. Fermi GRB 200830A: Global MASTER-Net observations report
  41. GRB 200829A: Fermi GBM detection
  42. GRB 200830A: BALROG localization (Fermi Trigger 620474063 / GRB 200830413)
  43. GRB 200830A: Fermi GBM Final Real-time Localization
  44. GRB 200826A: Lowell Discovery Telescope observations of ZTF20abwysqy
  45. Fermi trigger No 620402299: Global MASTER-Net observations report
  46. GRB 200826A: Kitab optical observations
  47. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  48. Konus-Wind detection of GRB 200826B
  49. IPN triangulation of GRB 200826B
  50. GRB 200826A: VLA Detection at 6 GHz
  51. GRB 200826A: Swift-XRT afterglow detection
  52. GRB 200824A: Insight-HXMT/HE detection
  53. GRB 200826B: Fermi GBM detection
  54. Fermi GRB 200826B: Global MASTER-Net observations report
  55. Fermi GRB 200824A: Global MASTER-Net observations report
  56. GRB200826A: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi Short GRB (Trigger 620108997)
  57. Konus-Wind detection of GRB 200826A
  58. GRB200826A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 620108997)
  59. GRB 200826B: Fermi GBM Final Real-time Localization
  60. IPN triangulation of GRB 200826A (short/bright)
  61. GRB 200826A: Tiled Swift observations
  62. GRB 200826A: AGILE detection
  63. GRB 200826A: AstroSat CZTI detection
  64. GRB 200826A: Fermi GBM observation
  65. GRB 200826A: BALROG localization (Fermi Trigger 620108997 / GRB 200826187)
  66. Fermi GRB 200826A: Global MASTER-Net observations report
  67. GRB 200826A: Fermi GBM Final Real-time Localization
  68. GRB 200824A: Fermi GBM Final Real-time Localization
  69. Konus-Wind observation of GRB 200815A
  70. IPN triangulation of GRB 200815A (short)
  71. GRB 200818A: Fermi GBM Final Localization
  72. Fermi trigger No 619487843: Global MASTER-Net observations report
  73. Fermi GRB 200817A: Global MASTER-Net observations report
  74. GRB 200817A: Fermi GBM Final Real-time Localization
  75. Fermi trigger No 619270776: Global MASTER-Net observations report
  76. GRB 200811A: Fermi GBM Final Real-time Localization
  77. GRB 200811A: BALROG localization (Fermi Trigger 618851447 / GRB 200811632)
  78. GRB 200809B: Fermi GBM detection
  79. Fermi GRB 200809B: Global MASTER-Net observations report
  80. GRB 200809B: BOOTES-3/YA optical upper limit
  81. GRB 200809B: Swift-XRT afterglow detection
  82. GRB 200809B: MAXI/GSC detection
  83. GRB 200809B: AstroSat CZTI detection
  84. GRB 200809B: Swift/BAT-GUANO detection and arcminute localization
  85. GRB 200809B: Fermi GBM Final Real-time Localization
  86. GRB 200808A: AGILE detection
  87. Fermi trigger No 618642276: Global MASTER-Net observations report
  88. GRB 200809A: Fermi GBM Final Real-time Localization
  89. Fermi GRB 200808A: Global MASTER-Net observations report
  90. GRB 200808A: Fermi GBM Final Real-time Localization
  91. GRB 200803A: Chilescope optical upper limit
  92. Fermi-LAT Gamma-ray Observations of IceCube-200806A
  93. IceCube-200806A: Upper limits from Fermi-GBM Observations
  94. IceCube-200806A: IceCube observation of a high-energy neutrino candidate event
  95. GRB 200803B: MASTER possibly OT discovery
  96. GRB 200803A: AstroSat CZTI detection
  97. GRB 200803A: Fermi GBM detection
  98. GRB 200803A: Swift-XRT afterglow detection
  99. Fermi GRB 200803B: Global MASTER-Net observations report
  100. GRB 200803A: Fermi-LAT detection

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