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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"

11634 results found.

  1. Fermi GRB 200909A: Global MASTER-Net observations report
  2. GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168)
  3. GRB 200909A: Fermi GBM Final Real-time Localization
  4. Fermi GRB 200908A: Global MASTER-Net observations report
  5. GRB 200908A: Fermi GBM Final Real-time Localization
  6. Fermi GRB 200907C: Global MASTER-Net observations report
  7. GRB 200907C: Fermi GBM Final Real-time Localization
  8. Fermi GRB 200906A: Global MASTER-Net observations report
  9. GRB 200906A: EMIR/GTC NIR upper limit
  10. GRB 200906A: OSN 1.5m Upper Limit
  11. GRB 200906A: Fermi GBM detection
  12. GRB 200906A: Fermi GBM Final Real-time Localization
  13. Fermi GRB 200904A: Global MASTER-Net observations report
  14. GRB 200904A: Fermi GBM Final Real-time Localization
  15. Fermi GRB 200903C: Global MASTER-Net observations report
  16. GRB 200903A: Fermi GBM detection
  17. GRB 200903C: Fermi GBM Final Real-time Localization
  18. GRB 200903B: Insight-HXMT/HE detection
  19. AGILE detection of a burst (AGILE trigger no. 526185273)
  20. Fermi GRB 200903B: Global MASTER-Net observations report
  21. GRB 200903B: Fermi GBM Final Real-time Localization
  22. GRB 200903A: Fermi GBM Final Real-time Localization
  23. GRB 200901A: Fermi GBM observation
  24. Fermi GBM trigger 620564765/200831463 is not a GRB
  25. Fermi GRB 200830A: Global MASTER-Net observations report
  26. GRB 200829A: Fermi GBM detection
  27. GRB 200830A: BALROG localization (Fermi Trigger 620474063 / GRB 200830413)
  28. GRB 200830A: Fermi GBM Final Real-time Localization
  29. GRB 200826A: Lowell Discovery Telescope observations of ZTF20abwysqy
  30. Fermi trigger No 620402299: Global MASTER-Net observations report
  31. GRB 200826A: Kitab optical observations
  32. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  33. Konus-Wind detection of GRB 200826B
  34. IPN triangulation of GRB 200826B
  35. GRB 200826A: VLA Detection at 6 GHz
  36. GRB 200826A: Swift-XRT afterglow detection
  37. GRB 200824A: Insight-HXMT/HE detection
  38. GRB 200826B: Fermi GBM detection
  39. Fermi GRB 200826B: Global MASTER-Net observations report
  40. Fermi GRB 200824A: Global MASTER-Net observations report
  41. GRB200826A: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi Short GRB (Trigger 620108997)
  42. Konus-Wind detection of GRB 200826A
  43. GRB200826A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 620108997)
  44. GRB 200826B: Fermi GBM Final Real-time Localization
  45. IPN triangulation of GRB 200826A (short/bright)
  46. GRB 200826A: Tiled Swift observations
  47. GRB 200826A: AGILE detection
  48. GRB 200826A: AstroSat CZTI detection
  49. GRB 200826A: Fermi GBM observation
  50. GRB 200826A: BALROG localization (Fermi Trigger 620108997 / GRB 200826187)
  51. Fermi GRB 200826A: Global MASTER-Net observations report
  52. GRB 200826A: Fermi GBM Final Real-time Localization
  53. GRB 200824A: Fermi GBM Final Real-time Localization
  54. Konus-Wind observation of GRB 200815A
  55. IPN triangulation of GRB 200815A (short)
  56. GRB 200818A: Fermi GBM Final Localization
  57. Fermi trigger No 619487843: Global MASTER-Net observations report
  58. Fermi GRB 200817A: Global MASTER-Net observations report
  59. GRB 200817A: Fermi GBM Final Real-time Localization
  60. Fermi trigger No 619270776: Global MASTER-Net observations report
  61. GRB 200811A: Fermi GBM Final Real-time Localization
  62. GRB 200811A: BALROG localization (Fermi Trigger 618851447 / GRB 200811632)
  63. GRB 200809B: Fermi GBM detection
  64. Fermi GRB 200809B: Global MASTER-Net observations report
  65. GRB 200809B: BOOTES-3/YA optical upper limit
  66. GRB 200809B: Swift-XRT afterglow detection
  67. GRB 200809B: MAXI/GSC detection
  68. GRB 200809B: AstroSat CZTI detection
  69. GRB 200809B: Swift/BAT-GUANO detection and arcminute localization
  70. GRB 200809B: Fermi GBM Final Real-time Localization
  71. GRB 200808A: AGILE detection
  72. Fermi trigger No 618642276: Global MASTER-Net observations report
  73. GRB 200809A: Fermi GBM Final Real-time Localization
  74. Fermi GRB 200808A: Global MASTER-Net observations report
  75. GRB 200808A: Fermi GBM Final Real-time Localization
  76. GRB 200803A: Chilescope optical upper limit
  77. Fermi-LAT Gamma-ray Observations of IceCube-200806A
  78. IceCube-200806A: Upper limits from Fermi-GBM Observations
  79. IceCube-200806A: IceCube observation of a high-energy neutrino candidate event
  80. GRB 200803B: MASTER possibly OT discovery
  81. GRB 200803A: AstroSat CZTI detection
  82. GRB 200803A: Fermi GBM detection
  83. GRB 200803A: Swift-XRT afterglow detection
  84. Fermi GRB 200803B: Global MASTER-Net observations report
  85. GRB 200803A: Fermi-LAT detection
  86. GRB 200803A: MASTER optical counterpart discovery
  87. GRB 200803B: Fermi GBM Final Real-time Localization
  88. GRB 200803A: Tiled Swift observations
  89. Fermi GRB 200803A: Global MASTER-Net observations report
  90. GRB 200801B: AstroSat CZTI detection
  91. GRB 200803A: Fermi GBM Final Real-time Localization
  92. Fermi GRB 200801B: Global MASTER-Net observations report
  93. Fermi GRB 200802A: Global MASTER-Net observations report
  94. Konus-Wind detection of GRB 200729A
  95. GRB 200802A: BALROG localization (Fermi Trigger 618061611 / GRB 200802491)
  96. GRB 200802A: Fermi GBM Final Real-time Localization
  97. Fermi GRB 200801A: Global MASTER-Net observations report
  98. Swift Detection of an SGR-like flare from AX J1846.4-0258
  99. GRB 200801B: BALROG localization (Fermi Trigger 617988951 / GRB 200801650)
  100. GRB 200801B: Fermi GBM Final Real-time Localization

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