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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

12121 results found.

  1. Konus-Wind observation of the recent SGR 1935+2154 activity
  2. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  3. AGILE observations of two bright bursts from SGR 1935+2154
  4. GRB 210912A: CAHA 2.2m Detection
  5. GRB 210912A: Swift-XRT refined Analysis
  6. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  7. Swift GRB 210912A: Global MASTER-Net observations report
  8. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  9. GRB 210912A: Swift detection of a burst
  10. Fermi trigger No 653084584: Global MASTER-Net observations report
  11. Fermi trigger No 653083551: Global MASTER-Net observations report
  12. Fermi trigger No 653072474: Global MASTER-Net observations report
  13. Fermi trigger No 653054042: Global MASTER-Net observations report
  14. Fermi trigger No 653049776: Global MASTER-Net observations report
  15. Fermi trigger No 653022153: Global MASTER-Net observations report
  16. Swift GRB210910.42: Global MASTER-Net observations report
  17. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  18. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  19. IPN triangulation of a bright burst from SGR 1935+2154
  20. Fermi trigger No 652981861: Global MASTER-Net observations report
  21. GECAM observations of a series of bursts from SGR J1935+2154
  22. Swift detection of a burst from SGR Swift J1555.2-5402
  23. Fermi trigger No 652934203: Global MASTER-Net observations report
  24. GECAM observation of a burst from SGR J1935+2154
  25. GECAM observation of a burst from SGR J1935+2154
  26. Fermi trigger No 652927551: Global MASTER-Net observations report
  27. GRB 210619B: Maidanak and Assy optical observations, broken power law parametrization
  28. Fermi trigger No 652911693: Global MASTER-Net observations report
  29. Fermi trigger No 652906639: Global MASTER-Net observations report
  30. Fermi GRB 210909A: Global MASTER-Net observations report
  31. GECAM observation of a burst from SGR J1555.2-5402
  32. GRB 210905A: ATCA detection
  33. GRB 210905A: ALMA detection
  34. GRB 210905A: AstroSat CZTI detection
  35. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  36. Fermi trigger No 652585475: Global MASTER-Net observations report
  37. GRB 210905A: Swift-XRT refined Analysis
  38. GRB 210610A: Maidanak and AbAO optical observations
  39. GRB 210827B: GECAM detection
  40. Fermi GRB 210904A: Global MASTER-Net observations report
  41. GRB 210904A: Fermi GBM Final Real-time Localization
  42. GRB 210901A: GROND observations
  43. Fermi GBM observation of a burst from SGR J1555.2-5402
  44. Integral GRB210829.14: Global MASTER-Net observations report
  45. GRB 210826A: AstroSat CZTI detection
  46. Fermi GRB 210827A: Global MASTER-Net observations report
  47. Fermi GRB 210827B: Global MASTER-Net observations report
  48. POLAR detection of a SGR-like burst
  49. GRB 210826A: Fermi-LAT detection
  50. GRB 210824A: MITSuME Akeno optical upper limits
  51. GRB 210822A: TSHAO continued optical observation
  52. GRB 210822A: VLA detection
  53. GRB 210822A: TSHAO optical observation
  54. Swift detection of an outburst from SGR Swift J1555.2-5402
  55. GRB 210824A: Swift-XRT refined Analysis
  56. GRB 210824A: Swift detection of a burst
  57. GRB 210822A: GECAM refined analysis
  58. Konus-Wind detection of GRB 210822A
  59. GRB 210822A: AstroSat CZTI detection
  60. GRB 210822A: Swift-BAT refined analysis
  61. GRB 210820A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  62. GRB 210822A: Fermi-LAT detection
  63. Fermi GRB 210822B: Global MASTER-Net observations report
  64. GRB 210822A: KAIT Optical Afterglow Confirmation
  65. GRB 210820A: LCO Optical Upper Limit
  66. GRB 210820A: Nanshan/NEXT optical upper limit
  67. GRB 210820A: Swift-XRT refined Analysis
  68. Swift GRB 210820A: Global MASTER-Net observations report
  69. GRB 210820B: Fermi GBM Final Localization
  70. Fermi trigger No 651110719: Global MASTER-Net observations report
  71. Konus-Wind detection of GRB 210818A
  72. GRB 210818A: AstroSat CZTI detection
  73. GRB 210818A: AGILE detection
  74. Fermi trigger No 650687034: Global MASTER-Net observations report
  75. Fermi-LAT Gamma-ray Observations of IceCube-210811A
  76. GRB 210807A: continued Assy, AbAO and Mondy observations
  77. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  78. GRB 210730A: Tautenburg observations
  79. GRB 210807A: Tautenburg observations
  80. IceCube Alert 210811.09: Global MASTER-Net observations report
  81. GRB 210807C: Swift-BAT refined analysis
  82. GRB 210610B: Assy optical observations
  83. Fermi GRB 210807C: Global MASTER-Net observations report
  84. Swift GRB210807.96: Global MASTER-Net observations report
  85. GRB 210807C: Swift detection of a burst
  86. Fermi GRB 210807B: Global MASTER-Net observations report
  87. Swift GRB210807.78: Global MASTER-Net observations report
  88. GRB 210807A: BOOTES-5/JGT optical afterglow detection
  89. GRB 210807A: Swift detection of a burst with an optical counterpart
  90. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  91. IPN Triangulation of a bright burst from SGR 1935+2154
  92. Fermi trigger No 649814537: Global MASTER-Net observations report
  93. GRB 210802A: BOOTES-2/TELMA optical upper limit
  94. GRB 210802A: Fermi GBM detection
  95. GRB 210802A: Fermi-LAT detection
  96. Fermi trigger No 649627691: Global MASTER-Net observations report
  97. Swift GRB210731.62: Global MASTER-Net observations report
  98. GRB 210731A: MeerLICHT optical afterglow detection
  99. GRB210731A: Enhanced Swift-XRT position
  100. Swift GRB210731.93: Global MASTER-Net observations report

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