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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"

12191 results found.

  1. Swift GRB 201015A: Global MASTER-Net observations report
  2. Fermi-LAT Gamma-ray Observations of IceCube-201014A
  3. GRB 201013A: FRAM-ORM possible afterglow candidate
  4. GRB 201013A: Swift-XRT refined Analysis
  5. SGR 1830-0645: Swift/UVOT Upper Limits
  6. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645
  7. Fermi trigger No 624139481: AGILE detection
  8. SGR 1830-0645: pre-discovery detection in Swift/BAT
  9. Fermi trigger No 624139481: Global MASTER-Net observations report
  10. SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
  11. Fermi trigger No 624121589: Global MASTER-Net observations report
  12. SGR 1830-0645: Swift-BAT refined analysis
  13. GRB 201006A: Chandra upper limit on the X-ray afterglow
  14. SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
  15. Swift detection of a new SGR 1830-0645 or a short GRB 201010A
  16. IceCube-201007A: No significant detection in HAWC
  17. IceCube-200926A: Upper limits from Insight-HXMT Observations
  18. Fermi-LAT Gamma-ray Observations of IceCube-201007A
  19. IceCube-201007A - IceCube observation of a high-energy neutrino candidate track-like event
  20. GRB 201006A: GROWTH-India Telescope optical upper limit
  21. Fermi GRB 201007A: Global MASTER-Net observations report
  22. Swift GRB201006.05: Global MASTER-Net observations report
  23. Fermi trigger No 623470566: Global MASTER-Net observations report
  24. Fermi trigger No 623493962: Global MASTER-Net observations report
  25. GRB 201001A: Swift-BAT refined analysis
  26. Fermi-LAT Gamma-ray Observations of IceCube-200929A
  27. IceCube-200929A: IceCube observation of a high-energy neutrino candidate event
  28. Fermi-LAT Gamma-ray Observations of IceCube-200926B
  29. Konus-Wind detection of GRB 200920B
  30. Fermi-LAT Gamma-ray Observations of IceCube-200926A
  31. IceCube-200926B: IceCube observation of a high-energy neutrino candidate event
  32. GRB 200925B: Swift-XRT refined Analysis
  33. IceCube-200926A: IceCube observation of a high-energy neutrino candidate event
  34. GRB 200925B: Swift detection of a burst
  35. Swift GRB200925.91: Global MASTER-Net observations report
  36. Fermi GRB 200925A: Global MASTER-Net observations report
  37. Konus-Wind observation of GRB 200914A
  38. GRB 200924A: Fermi GBM Final Real-time Localization
  39. Fermi GRB 200923A: Global MASTER-Net observations report
  40. IceCube Alert 200921.80: Global MASTER-Net observations report
  41. IceCube-200921A: Upper limits from a search for additional neutrino events in IceCube
  42. Fermi-LAT Gamma-ray Observations of IceCube-200921A and detection of a new gamma-ray source, Fermi J1256.9+2630
  43. Fermi GRB 200922B: Global MASTER-Net observations report
  44. GRB 200922A: Swift-XRT refined Analysis
  45. GRB 200922A: Swift detection of a burst with possible optical counterpart
  46. IceCube-200921A: IceCube observation of a high-energy neutrino candidate event
  47. GRB 200920B: AGILE/MCAL detection of a burst
  48. GRB 200920A: Fermi GBM Final Real-time Localization
  49. Fermi GRB 200919C: Global MASTER-Net observations report
  50. Swift GRB200919.08: Global MASTER-Net observations report
  51. GRB 200919A: Swift detection of a burst
  52. IceCube-200916A: AbAO observations of optical candidates ZTF20acaapwk/AT2020tno, ZTF20acaapwo/AT2020tnp
  53. IceCube-200916A: Upper limits from a search for additional neutrino events in IceCube
  54. Swift-XRT observations of IceCube 200916A
  55. IceCube-200916A: No significant detection in HAWC
  56. IceCube-200916A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  57. IceCube-200916A: Two Candidate Counterparts from the Zwicky Transient Facility
  58. Fermi-LAT Gamma-ray Observations of IceCube-200916A
  59. IceCube-200916A - IceCube observation of a high-energy neutrino candidate track-like event
  60. Fermi GRB 200916A: Global MASTER-Net observations report
  61. Integral GRB200914.53: Global MASTER-Net observations report
  62. Fermi GRB 200914A: Global MASTER-Net observations report
  63. IceCube Alert 200914.00: Global MASTER-Net observations report
  64. Fermi-LAT Gamma-ray Observations of IceCube-200911A and detection of a new gamma-ray source, Fermi J0330.1+3743
  65. GRB 200914A : A long GRB detected by INTEGRAL
  66. IceCube-200911A: IceCube observation of a high-energy neutrino candidate event
  67. IPN triangulation of GRB 200907A (short)
  68. GRB 200909B: Swift-BAT refined analysis
  69. Swift GRB200909.97: Global MASTER-Net observations report
  70. GRB 200909A: AstroSat CZTI detection
  71. GRB 200829A: T100 observations
  72. Fermi GRB 200909A: Global MASTER-Net observations report
  73. Fermi GRB 200908A: Global MASTER-Net observations report
  74. Konus-Wind detection of GRB 200903E
  75. Fermi GRB 200907C: Global MASTER-Net observations report
  76. Fermi GRB 200906A: Global MASTER-Net observations report
  77. GRB 200906A: Swift-XRT refined Analysis
  78. GRB 200906A: Swift detection of a burst
  79. GRB 200903D: MAXI/GSC detection
  80. GRB 200903A: Swift-BAT refined analysis
  81. GRB200817B: AstroSat CZTI detection
  82. Fermi GRB 200903B: Global MASTER-Net observations report
  83. GRB 200901A: MASTER OT early detection
  84. GRB 200901A: Swift-XRT refined Analysis
  85. Swift GRB200901.16: Global MASTER-Net observations report
  86. GRB 200829A: Koshka Zeiss-1000 optical observations
  87. GRB 200829A: Liverpool Telescope observations
  88. GRB 200829A: Fermi GBM detection
  89. Konus-Wind detection of GRB 200829A (a clone of GRB 200826B?)
  90. GRB 200829A: Swift-XRT refined Analysis
  91. GRB 200829A: AGILE/MCAL detection
  92. GRB 200829A: Swift detection of a burst with an optical afterglow
  93. Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow
  94. Konus-Wind detection of GRB 200826B
  95. GRB 200826A: Swift-XRT afterglow detection
  96. Fermi GRB 200826B: Global MASTER-Net observations report
  97. Fermi GRB 200824A: Global MASTER-Net observations report
  98. Konus-Wind detection of GRB 200826A
  99. Fermi GRB 200826A: Global MASTER-Net observations report
  100. IceCube-200806A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation

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