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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"

19608 results found.

  1. Trigger 1159327: Swift detection of SGR1806-20
  2. GRB 230307A: MAXI/GSC upper limit
  3. GRB 230307A: Possible optical afterglow
  4. GRB 230307A: ASO-S/HXI detection
  5. GRB 230307A: optical upper limit
  6. GRB 230217A: ATCA rapid-response radio detection
  7. Swift Trigger 1159108 is not a GRB
  8. GRB 230307A: Swift/BAT upper limits on the early afterglow
  9. GRB 230307A: Swift-XRT observations
  10. Improved IPN localization for GRB 230307A
  11. GRB 230307A: Tiled Swift observations
  12. IPN triangulation of GRB 230307A (long/very bright)
  13. GRB 230228A: Swift-BAT refined analysis
  14. GRB 230228A: Swift/UVOT Upper Limits
  15. GRB 230228A: Fermi GBM Observation
  16. GRB 230228A: OSN optical upper limit
  17. GRB 230228A: Swift-XRT refined Analysis
  18. GRB 230228A: Mondy optical upper limit
  19. GRB 230228A: Enhanced Swift-XRT position
  20. GRB 230228A: Nanshan/NEXT optical upper limit
  21. GRB 230228A: Miryang Arirang Astronomical Observatory (MAAO) 0.7-m telescope optical upper limit
  22. GRB 230228A: Prompt enhanced Swift-XRT position
  23. GRB 230228A: Swift detection of a possibly short burst
  24. GRB 230216A Mondy Observations
  25. GRB 230217A: Swift/UVOT Upper Limits
  26. GRB 230216A: Swift/UVOT Upper Limits
  27. GRB 230217A: Swift-XRT afterglow detection
  28. GRB 230217A: Swift-BAT refined analysis
  29. GRB 230217A: AstroSat CZTI detection
  30. GRB 230217A: 6 GHz VLA observations
  31. GRB 230217A: Fermi GBM observation
  32. Konus-Wind detection of GRB 230217A
  33. GRB 230217A: Swift-XRT observations
  34. GRB 230217A: AGILE/MCAL detection
  35. GRB 230207B: CALET Gamma-Ray Burst Monitor detection
  36. GRB 230216A: SVOM/C-GFT optical upper limit
  37. GRB 230217A: Swift detection of a short burst
  38. GRB 230216A: Swift-BAT refined analysis
  39. GRB 230216A: Swift-XRT refined Analysis
  40. Swift GRB 230216A: Global MASTER-Net observations report
  41. GRB 230216A: Enhanced Swift-XRT position
  42. GRB 230216A: AKO Upper Limit
  43. GRB 230216A: Zadko observatory - Gingin optical observations
  44. GRB 230216A: Swift detection of a burst
  45. GRB 230209B: AGILE detection
  46. GRB 230209B: Fermi GBM Observation
  47. IPN triangulation of GRB 230209B
  48. GRB 230204B: CALET Gamma-Ray Burst Monitor detection
  49. GRB 230209B: Swift/BAT-GUANO detection outside the coded FOV
  50. Swift Trigger 1153670 is probably not a GRB
  51. GRB 221009A: Continued Swift Observations
  52. GRB 230207B: Detection by GRBAlpha
  53. GRB 230207B: Swift/BAT-GUANO detection outside the coded FOV
  54. ZTF23aabmzlp/AT2023azs: Neil Gehrels Swift Observatory X-ray observations
  55. GRB 230204B: Swift/UVOT Upper Limits
  56. GRB 230205A: Swift/UVOT Upper Limits
  57. GRB 230204B: Fermi GBM detection
  58. GRB 230204B: Swift-XRT afterglow detection
  59. GRB 230205A: SVOM/C-GFT optical upper limit
  60. GRB 230205A: Swift-BAT refined analysis (T90 = 2.3 s)
  61. GRB 230204A: Swift-BAT refined analysis
  62. GRB 230205A: Swift-XRT refined Analysis
  63. GRB 230204B: Swift ToO observations
  64. GRB 230205A: Enhanced Swift-XRT position
  65. GRB 230205A: BOOTES-5/JGT early optical upper limit
  66. GRB 230204B: Detection by GRBAlpha
  67. GRB 230204B: AGILE detection
  68. GRB 230205A: Swift detection of a burst
  69. GRB 230204B: GIT discovery of the likely optical afterglow
  70. GRB 230204B: AstroSat CZTI detection
  71. GRB 230204B: Swift/BAT-GUANO detection outside the coded FOV
  72. GRB 230204A: Swift/UVOT Upper Limits
  73. GRB 230204A: Swift-XRT refined Analysis
  74. GRB 230204A/Swift J1552.8-5055: LCOGT Optical Counterpart Candidate
  75. GRB 230204A: Enhanced Swift-XRT position
  76. GRB 230204A: Swift detection of a possible burst (or possible transient Swift J1552.8-5055)
  77. GRB 221216A: Swift-BAT refined analysis
  78. AT2023avj: X-ray Detection with Swift/XRT
  79. Swift-XRT observations of NuEm-230125A
  80. Trigger 1150965: Swift detection of LS V +44 17
  81. GRB 230124A: Fermi GBM Observation
  82. GRB 230124A: Swift/BAT-GUANO detection outside the coded FOV
  83. GRB 230123A: Swift-BAT refined analysis
  84. GRB 230122A: Swift/BAT-GUANO detection
  85. GRB 230123A: Swift/UVOT Upper Limits
  86. GRB 230123A: Swift-XRT refined Analysis
  87. GRB 230123A: Enhanced Swift-XRT position
  88. GRB 230123A: Zadko observatory - Gingin optical observations
  89. GRB 230116C: Swift-XRT observations
  90. GRB 230123A: Swift detection of a burst
  91. Trigger 1150107: Swift detection of LS V +44 17
  92. GRB 230116D: 3.6m DOT optical upper limit
  93. GRB 230116D: Swift-BAT refined analysis
  94. GRB 230116C: Swift-BAT refined analysis
  95. GRB 230116D: Swift-XRT refined Analysis
  96. GRB 230116D: GIT optical follow-up
  97. GRB 230116D: Enhanced Swift-XRT position
  98. GRB 230116D: Nanshan/NEXT optical afterglow detection
  99. GRB 230116D: Swift detection of a burst
  100. Swift GRB230116.88: Global MASTER-Net observations report

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