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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"

19666 results found.

  1. Swift GRB 230405B: Global MASTER-Net observations report
  2. GRB 230405B: Prompt enhanced Swift-XRT position
  3. GRB 230405B: Swift detection of a burst
  4. GRB 230307A: Chandra late-time detection of the X-ray afterglow
  5. GRB 230228A: detection by GTC of the potential host galaxy
  6. GRB 230328B: Swift/UVOT Detection
  7. GRB 230328B : GRANDMA/Kilonova-Catcher optical detection
  8. GRB 230328B: CAHA 2.2m/CAFOS detection
  9. GRB 230328B: 3.6m DOT multiband optical observation
  10. Konus-Wind detection of GRB 230328B
  11. GRB 230328B: GRBAlpha detection
  12. GRB 230328B: Swift-BAT refined analysis
  13. GRB 230328B: Nanshan/NEXT 2nd optical observation
  14. GRB 230328B: Liverpool Telescope afterglow detection
  15. GRB 230328B: GIT optical follow-up
  16. GRB 230328B: OASDG optical observations
  17. GRB 230328B: Nanshan/NEXT optical upper limit
  18. GRB 230328B: Swift-XRT refined Analysis
  19. GRB 230328B: AstroSat CZTI detection
  20. GRB 230328B: Fermi GBM observation
  21. GRB 230328B: Mondy, AbAO and Kitab optical observations
  22. GRB 230328B: Enhanced Swift-XRT position
  23. GRB 230328B: Mondy optical afterglow confirmation
  24. GRB 230328B: Swift detection of a burst with an optical afterglow
  25. GRB 230325A: Swift-BAT refined analysis
  26. GRB 230325A: Swift/UVOT Upper Limits
  27. GRB 230325A: Swift-XRT refined Analysis
  28. GRB 230322B: Swift-BAT refined analysis
  29. GRB 230325A: Enhanced Swift-XRT position
  30. GRB 230325A: Prompt enhanced Swift-XRT position
  31. GRB 230325A: Swift detection of a burst
  32. GRB 230320B: Fermi GBM Observation
  33. GRB 230322B: Swift/UVOT Detection
  34. GRB 230322B: Swift-XRT refined Analysis
  35. GRB 230322B: Enhanced Swift-XRT position
  36. Swift GRB 230322B: Global MASTER-Net observations report
  37. GRB 230322B: Swift detection of a burst with optical counterpart
  38. GRB 230320B: GRBAlpha detection
  39. GRB 230320B: Swift/BAT-GUANO detection outside the coded FOV
  40. Trigger 1160641: Swift detection of 4U 1630-472 (a.k.a. SWIFT J1633.8-4724A)
  41. IPN triangulation of GRB 230309A
  42. VZLUSAT-2 detection of SGR 1806-20
  43. GRB 230307A: Swift/UVOT detection
  44. GRB 230307A: soft X-ray detection with LEIA
  45. GRB 230307A: Swift-XRT afterglow detection
  46. Swift GRB230311.85: Global MASTER-Net observations report
  47. Swift GRB230311.83: Global MASTER-Net observations report
  48. Further improved IPN localization for GRB 230307A
  49. Swift GRB230311.81: Global MASTER-Net observations report
  50. GRB 230307A: SOAR/Goodman detection of the possible host galaxy
  51. Swift GRB230311.84: Global MASTER-Net observations report
  52. Swift Trigger 1159438 is also due to the Star Tracker loss of lock.
  53. Swift GRB230311.82: Global MASTER-Net observations report
  54. Triggers 1159434, 1159435 and 1159437: Swift detection of Sco X-1 due to Star Tracker loss of lock
  55. Trigger 1159327: Swift detection of SGR1806-20
  56. GRB 230307A: MAXI/GSC upper limit
  57. GRB 230307A: Possible optical afterglow
  58. GRB 230307A: ASO-S/HXI detection
  59. GRB 230307A: optical upper limit
  60. GRB 230217A: ATCA rapid-response radio detection
  61. Swift Trigger 1159108 is not a GRB
  62. GRB 230307A: Swift/BAT upper limits on the early afterglow
  63. GRB 230307A: Swift-XRT observations
  64. Improved IPN localization for GRB 230307A
  65. GRB 230307A: Tiled Swift observations
  66. IPN triangulation of GRB 230307A (long/very bright)
  67. GRB 230228A: Swift-BAT refined analysis
  68. GRB 230228A: Swift/UVOT Upper Limits
  69. GRB 230228A: Fermi GBM Observation
  70. GRB 230228A: OSN optical upper limit
  71. GRB 230228A: Swift-XRT refined Analysis
  72. GRB 230228A: Mondy optical upper limit
  73. GRB 230228A: Enhanced Swift-XRT position
  74. GRB 230228A: Nanshan/NEXT optical upper limit
  75. GRB 230228A: Miryang Arirang Astronomical Observatory (MAAO) 0.7-m telescope optical upper limit
  76. GRB 230228A: Prompt enhanced Swift-XRT position
  77. GRB 230228A: Swift detection of a possibly short burst
  78. GRB 230216A Mondy Observations
  79. GRB 230217A: Swift/UVOT Upper Limits
  80. GRB 230216A: Swift/UVOT Upper Limits
  81. GRB 230217A: Swift-XRT afterglow detection
  82. GRB 230217A: Swift-BAT refined analysis
  83. GRB 230217A: AstroSat CZTI detection
  84. GRB 230217A: 6 GHz VLA observations
  85. GRB 230217A: Fermi GBM observation
  86. Konus-Wind detection of GRB 230217A
  87. GRB 230217A: Swift-XRT observations
  88. GRB 230217A: AGILE/MCAL detection
  89. GRB 230207B: CALET Gamma-Ray Burst Monitor detection
  90. GRB 230216A: SVOM/C-GFT optical upper limit
  91. GRB 230217A: Swift detection of a short burst
  92. GRB 230216A: Swift-BAT refined analysis
  93. GRB 230216A: Swift-XRT refined Analysis
  94. Swift GRB 230216A: Global MASTER-Net observations report
  95. GRB 230216A: Enhanced Swift-XRT position
  96. GRB 230216A: AKO Upper Limit
  97. GRB 230216A: Zadko observatory - Gingin optical observations
  98. GRB 230216A: Swift detection of a burst
  99. GRB 230209B: AGILE detection
  100. GRB 230209B: Fermi GBM Observation

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