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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"

36400 results found.

  1. GRB 220930A: MITSuME Akeno optical upper limits
  2. GRB 220912A: Detection by VZLUSAT-2
  3. GRB220927A: Detection by GRBAlpha
  4. Fermi GBM trigger 686565116/221004355 is not a GRB
  5. Fermi GBM trigger 686435254/221002852 is not a GRB
  6. Fermi GBM trigger 686350260/221001869 is not a GRB
  7. GRB 220921A: ATCA detection of radio counterpart
  8. GRB 220930A: AbAO Optical Upper Limit
  9. Konus-Wind detection of GRB 220930A
  10. GRB 220930A: AstroSat CZTI detection
  11. GRB 220930A: Swift-BAT refined analysis
  12. GRB 220930A: Swift-XRT refined Analysis
  13. GRB 220930A: LCOGT Optical Upper Limits
  14. GRB 220930A: Swift/UVOT Upper Limits
  15. GRB 220930A: Enhanced Swift-XRT position
  16. Swift GRB 220930A: Global MASTER-Net observations report
  17. GRB 220930A: BOOTES-5/JGT early optical upper limit
  18. GRB 220930A: Prompt enhanced Swift-XRT position
  19. GRB 220930A: COATLI Upper Limits
  20. GRB 220930A: Swift detection of a burst
  21. Konus-Wind detection of GRB 220927A
  22. Fermi GRB 220927A: Global MASTER-Net observations report
  23. IPN triangulation of GRB 220927A (long)
  24. GRB 220921A: LCOGT Optical Observations
  25. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  26. GRB 220927A: Fermi GBM Final Localization
  27. GRB 220924A: Fermi GBM detection
  28. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  29. Swift Trigger 1125354 (GRB 220926A) is not a GRB
  30. Swift GRB 220926A: Global MASTER-Net observations report
  31. Analysis of long GRB 220926B detected by INTEGRAL
  32. GRB 220926B
  33. GRB 220926A: Swift detection of a burst
  34. Fermi GRB 220925A: Global MASTER-Net observations report
  35. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  36. GRB 220921A: further MeerLICHT observations
  37. GRB 220925A: Fermi GBM Final Real-time Localization
  38. GRB 220924A: Fermi GBM Final Real-time Localization
  39. GRB 220921A: ALMA detection
  40. GRB 220921A: DDOTI Detection of the Afterglow
  41. Konus-Wind detection of GRB 220921A
  42. GRB 220921A: Fermi GBM detection
  43. GRB 220921A: MeerLICHT afterglow observations
  44. GRB 220921A: Swift-XRT Observations
  45. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  46. GRB 220921A: Fermi-LAT detection
  47. GRB 220921A: Tiled Swift observations
  48. Improved IPN error box for GRB 220910A
  49. GRB 220909A: Fermi GBM observation
  50. Konus-Wind detection of GRB 220910A
  51. GRB 220910B: Fermi GBM Final Localization
  52. Fermi GRB 220912A: Global MASTER-Net observations report
  53. GRB 220910A: Fermi GBM observation
  54. IPN triangulation of GRB 220910A (bright/long)
  55. GRB 220912A: AstroSat CZTI detection
  56. GRB 220831A: DECam optical counterpart follow-up
  57. GRB 220909A: Swift-XRT observations
  58. GRB 220912A: Fermi GBM Final Real-time Localization
  59. IPN triangulation of GRB 220905A
  60. GRB 220909A: Swift ToO observations
  61. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  62. GRB 220831A: Gemini-South Infrared Observations
  63. GRB 220910A: AstroSat CZTI detection
  64. GRB 220910A: AGILE detection
  65. GRB 220909A: Fermi GBM Final Real-time Localization
  66. GRB 220907A: Swift-BAT refined analysis
  67. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  68. IPN triangulation of GRB 220903A (long)
  69. GRB 220907A: Fermi GBM observation
  70. GRB 220907A: Nanshan/NEXT optical upper limits
  71. GRB 220907A: Swift/UVOT Upper Limits
  72. GRB 220907A: Swift-XRT refined Analysis
  73. GRB 220831A: ATCA 5/9 GHz radio observations
  74. GRB 220907A: Swift-XRT position
  75. GRB 220907A: Swift detection of a burst
  76. GRB 220907A: Fermi GBM Final Real-time Localization
  77. GRB 220831A: Swift-UVOT Upper Limits
  78. Fermi GRB 220905A: Global MASTER-Net observations report
  79. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  80. GRB 220905A: Fermi GBM Final Real-time Localization
  81. GRB 220831A: DECam detection of a possible optical counterpart
  82. Fermi GRB 220902A: Global MASTER-Net observations report
  83. GRB 220902A: Fermi GBM Final Real-time Localization
  84. GRB 220831A, VLT/HAWK-I near-infrared observations
  85. GRB 220831C: Fermi GBM Final Localization
  86. GRB 220831A: Fermi GBM observation
  87. GRB 220831A: Swift-XRT observations
  88. GRB 220831B: Fermi GBM Final Localization
  89. GRB 220831A: Swift ToO observations
  90. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  91. Fermi GBM trigger 683571622/220830709 is not a GRB
  92. Konus-Wind detection of GRB 220826A
  93. GRB 220827A: Fermi GBM Final Real-time Localization
  94. GRB 220826A: Swift-BAT refined analysis
  95. GRB 220826A: Fermi GBM observation
  96. GRB 220826A: Swift-XRT refined Analysis
  97. GRB 220825A: Fermi GBM observation
  98. GRB 220826A: Lesedi optical afterglow detection
  99. GRB 220826A: Swift/UVOT Detection
  100. GRB 220826A: iTelescope optical afterglow observations

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