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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"

36423 results found.

  1. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  2. GRB 221009A: REM optical and NIR detection of the afterglow
  3. GRB 221009A: Swift-XRT refined Analysis
  4. GRB 221009A (Swift J1913.1+1946): AGILE/MCAL detection
  5. GRB 221009A: Redshift from X-shooter/VLT
  6. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  7. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  8. GRB 221009A (Swift J1913.1+1946): Mondy optical observations
  9. GRB 221009A BOOTES-2/TELMA and OSN optical detections
  10. GRB 221009A: Fermi GBM observation
  11. IPN triangulation of extremely bright GRB 221009A
  12. Swift J1913.1+1946: Optical photometry
  13. Swift J1913.1+1946: Liverpool Telescope imaging and spectroscopy
  14. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  15. GRB 221009A: Fermi GBM detection of an extraordinarily bright GRB
  16. GRB 221009A: Swift detected transient may be GRB
  17. GRB 221008A: Swift-XRT observations
  18. GRB 221008A: Tiled Swift observations
  19. GRB 221008A: MAXI/GSC detection
  20. GRB 220915A: Detection by GRBAlpha
  21. GRB 221006A: Swift-XRT observations
  22. GRB 221006A: Tiled Swift observations
  23. GRB 221006A: MAXI/GSC detection
  24. GRB 220930A: MITSuME Akeno optical upper limits
  25. GRB 220912A: Detection by VZLUSAT-2
  26. GRB220927A: Detection by GRBAlpha
  27. Fermi GBM trigger 686565116/221004355 is not a GRB
  28. Fermi GBM trigger 686435254/221002852 is not a GRB
  29. Fermi GBM trigger 686350260/221001869 is not a GRB
  30. GRB 220921A: ATCA detection of radio counterpart
  31. GRB 220930A: AbAO Optical Upper Limit
  32. Konus-Wind detection of GRB 220930A
  33. GRB 220930A: AstroSat CZTI detection
  34. GRB 220930A: Swift-BAT refined analysis
  35. GRB 220930A: Swift-XRT refined Analysis
  36. GRB 220930A: LCOGT Optical Upper Limits
  37. GRB 220930A: Swift/UVOT Upper Limits
  38. GRB 220930A: Enhanced Swift-XRT position
  39. Swift GRB 220930A: Global MASTER-Net observations report
  40. GRB 220930A: BOOTES-5/JGT early optical upper limit
  41. GRB 220930A: Prompt enhanced Swift-XRT position
  42. GRB 220930A: COATLI Upper Limits
  43. GRB 220930A: Swift detection of a burst
  44. Konus-Wind detection of GRB 220927A
  45. Fermi GRB 220927A: Global MASTER-Net observations report
  46. IPN triangulation of GRB 220927A (long)
  47. GRB 220921A: LCOGT Optical Observations
  48. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  49. GRB 220927A: Fermi GBM Final Localization
  50. GRB 220924A: Fermi GBM detection
  51. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  52. Swift Trigger 1125354 (GRB 220926A) is not a GRB
  53. Swift GRB 220926A: Global MASTER-Net observations report
  54. Analysis of long GRB 220926B detected by INTEGRAL
  55. GRB 220926B
  56. GRB 220926A: Swift detection of a burst
  57. Fermi GRB 220925A: Global MASTER-Net observations report
  58. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  59. GRB 220921A: further MeerLICHT observations
  60. GRB 220925A: Fermi GBM Final Real-time Localization
  61. GRB 220924A: Fermi GBM Final Real-time Localization
  62. GRB 220921A: ALMA detection
  63. GRB 220921A: DDOTI Detection of the Afterglow
  64. Konus-Wind detection of GRB 220921A
  65. GRB 220921A: Fermi GBM detection
  66. GRB 220921A: MeerLICHT afterglow observations
  67. GRB 220921A: Swift-XRT Observations
  68. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  69. GRB 220921A: Fermi-LAT detection
  70. GRB 220921A: Tiled Swift observations
  71. Improved IPN error box for GRB 220910A
  72. GRB 220909A: Fermi GBM observation
  73. Konus-Wind detection of GRB 220910A
  74. GRB 220910B: Fermi GBM Final Localization
  75. Fermi GRB 220912A: Global MASTER-Net observations report
  76. GRB 220910A: Fermi GBM observation
  77. IPN triangulation of GRB 220910A (bright/long)
  78. GRB 220912A: AstroSat CZTI detection
  79. GRB 220831A: DECam optical counterpart follow-up
  80. GRB 220909A: Swift-XRT observations
  81. GRB 220912A: Fermi GBM Final Real-time Localization
  82. IPN triangulation of GRB 220905A
  83. GRB 220909A: Swift ToO observations
  84. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  85. GRB 220831A: Gemini-South Infrared Observations
  86. GRB 220910A: AstroSat CZTI detection
  87. GRB 220910A: AGILE detection
  88. GRB 220909A: Fermi GBM Final Real-time Localization
  89. GRB 220907A: Swift-BAT refined analysis
  90. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  91. IPN triangulation of GRB 220903A (long)
  92. GRB 220907A: Fermi GBM observation
  93. GRB 220907A: Nanshan/NEXT optical upper limits
  94. GRB 220907A: Swift/UVOT Upper Limits
  95. GRB 220907A: Swift-XRT refined Analysis
  96. GRB 220831A: ATCA 5/9 GHz radio observations
  97. GRB 220907A: Swift-XRT position
  98. GRB 220907A: Swift detection of a burst
  99. GRB 220907A: Fermi GBM Final Real-time Localization
  100. GRB 220831A: Swift-UVOT Upper Limits

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