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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. GRB 221009A: Upper limits from HAWC 8 hours after trigger
  2. GRB 221011A: Fermi GBM Final Real-time Localization
  3. GRB 221009A: BlackGEM optical observations
  4. LHAASO observed GRB 221009A with more than 5000 VHE photons up to around 18 TeV
  5. GRB 221009A: NOEMA mm detection
  6. Fermi trigger No 687077239: Global MASTER-Net observations report
  7. Konus-Wind detection of GRB 221009A
  8. GRB 221009A: Lulin SLT-40cm optical observations
  9. GRB 221009A: Upper limits from a neutrino search with IceCube
  10. GRB221009A/Swift J1913.1+1946: SRG/ART-XC observation
  11. GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow
  12. GRB 221009A: Fermi-LAT refined analysis
  13. GRB 221009A (Swift J1913.1+1946): AGILE/GRID detection
  14. GRB 221009: Swift/UVOT Detection
  15. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  16. GRB 221009A: REM optical and NIR detection of the afterglow
  17. GRB 221009A (Swift J1913.1+1946): AGILE/MCAL detection
  18. GRB 221009A: Redshift from X-shooter/VLT
  19. GRB 221009A (Swift J1913.1+1946): Mondy optical observations
  20. GRB 221009A BOOTES-2/TELMA and OSN optical detections
  21. GRB 221009A: Fermi GBM observation
  22. IPN triangulation of extremely bright GRB 221009A
  23. Fermi trigger No 687014224: Global MASTER-Net observations report
  24. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  25. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB
  26. GRB 221009A: Swift detected transient may be GRB
  27. GRB 220915A: Detection by GRBAlpha
  28. GRB 220912A: Detection by VZLUSAT-2
  29. Fermi trigger No 686588176: Global MASTER-Net observations report
  30. GRB220927A: Detection by GRBAlpha
  31. Fermi GBM trigger 686565116/221004355 is not a GRB
  32. Fermi GBM trigger 686435254/221002852 is not a GRB
  33. Fermi GBM trigger 686350260/221001869 is not a GRB
  34. Fermi trigger No 686403226: Global MASTER-Net observations report
  35. Fermi trigger No 686350260: Global MASTER-Net observations report
  36. Fermi-LAT gamma-ray observations of IceCube-220928A
  37. Konus-Wind detection of GRB 220927A
  38. IceCube-220928A - IceCube observation of a high-energy neutrino candidate track-like event
  39. Fermi GRB 220927A: Global MASTER-Net observations report
  40. IPN triangulation of GRB 220927A (long)
  41. GRB 220921A: LCOGT Optical Observations
  42. GRB 220927A: Fermi GBM Final Localization
  43. GRB 220924A: Fermi GBM detection
  44. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  45. Fermi GRB 220925A: Global MASTER-Net observations report
  46. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  47. GRB 220925A: Fermi GBM Final Real-time Localization
  48. Fermi trigger No 685748699: Global MASTER-Net observations report
  49. GRB 220924A: Fermi GBM Final Real-time Localization
  50. GRB 220921A: DDOTI Detection of the Afterglow
  51. Konus-Wind detection of GRB 220921A
  52. GRB 220921A: Fermi GBM detection
  53. GRB 220921A: MeerLICHT afterglow observations
  54. GRB 220921A: Swift-XRT Observations
  55. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  56. GRB 220921A: Fermi-LAT detection
  57. GRB 220921A: Tiled Swift observations
  58. Fermi trigger No 685452089: Global MASTER-Net observations report
  59. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  60. IceCube-220918A - IceCube observation of a high-energy neutrino candidate track-like event
  61. Fermi trigger No 684894705: Global MASTER-Net observations report
  62. Improved IPN error box for GRB 220910A
  63. Fermi trigger No 684927323: Global MASTER-Net observations report
  64. Fermi trigger No 684911625: Global MASTER-Net observations report
  65. GRB 220909A: Fermi GBM observation
  66. Konus-Wind detection of GRB 220910A
  67. GRB 220910B: Fermi GBM Final Localization
  68. Fermi trigger No 684716840: Global MASTER-Net observations report
  69. Fermi GRB 220912A: Global MASTER-Net observations report
  70. GRB 220910A: Fermi GBM observation
  71. IPN triangulation of GRB 220910A (bright/long)
  72. GRB 220912A: AstroSat CZTI detection
  73. GRB 220912A: Fermi GBM Final Real-time Localization
  74. IPN triangulation of GRB 220905A
  75. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  76. GRB 220909A: Fermi GBM Final Real-time Localization
  77. IPN triangulation of GRB 220903A (long)
  78. GRB 220907A: Fermi GBM observation
  79. GRB 220907A: Nanshan/NEXT optical upper limits
  80. GRB 220831A: ATCA 5/9 GHz radio observations
  81. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  82. GRB 220907A: Swift detection of a burst
  83. GRB 220907A: Fermi GBM Final Real-time Localization
  84. IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event
  85. Fermi GRB 220905A: Global MASTER-Net observations report
  86. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  87. GRB 220905A: Fermi GBM Final Real-time Localization
  88. Fermi GRB 220902A: Global MASTER-Net observations report
  89. GRB 220902A: Fermi GBM Final Real-time Localization
  90. GRB 220831C: Fermi GBM Final Localization
  91. GRB 220831A: Fermi GBM observation
  92. GRB 220831B: Fermi GBM Final Localization
  93. Fermi trigger No 683654200: Global MASTER-Net observations report
  94. Fermi trigger No 683646997: Global MASTER-Net observations report
  95. Fermi trigger No 683537972: Global MASTER-Net observations report
  96. Fermi GBM trigger 683571622/220830709 is not a GRB
  97. Fermi trigger No 683476673: Global MASTER-Net observations report
  98. Konus-Wind detection of GRB 220826A
  99. GRB 220827A: Fermi GBM Final Real-time Localization
  100. GRB 220826A: Fermi GBM observation

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