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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"

11835 results found.

  1. Integral GRB221012.63: Global MASTER-Net observations report
  2. Integral GRB221012.61: Global MASTER-Net observations report
  3. Integral GRB221012.60: Global MASTER-Net observations report
  4. Integral GRB221012.53: Global MASTER-Net observations report
  5. Fermi trigger No 687205006: Global MASTER-Net observations report
  6. INTEGRAL detection of a burst from SGR J1935+2154
  7. GRB 221009A: NuSTAR Detection
  8. GRB221009A: INTEGRAL detection of Hard X-ray emission up to 38 hours after trigger
  9. GRB 221009A: Detection by GRBAlpha
  10. INTEGRAL detection of a burst from SGR J1935+2154
  11. Integral GRB221010.89: Global MASTER-Net observations report
  12. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  13. Konus-Wind detection of GRB 221009A
  14. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  15. ​GRB 221009A: Multi-color detection of the optical
  16. GRB 221009A: Fermi-LAT refined analysis
  17. GRB 221009: Swift/UVOT Detection
  18. Swift J1913.1+1946: Optical photometry
  19. Fermi trigger No 687014224: Global MASTER-Net observations report
  20. Swift J1913.1+1946: Liverpool Telescope imaging and spectroscopy
  21. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  22. GRB 221008A: MAXI/GSC detection
  23. GRB 221006A: MAXI/GSC detection
  24. Fermi GBM trigger 686435254/221002852 is not a GRB
  25. Fermi GBM trigger 686350260/221001869 is not a GRB
  26. Fermi trigger No 686403226: Global MASTER-Net observations report
  27. Fermi trigger No 686350260: Global MASTER-Net observations report
  28. Konus-Wind detection of GRB 220930A
  29. GRB 220930A: AstroSat CZTI detection
  30. GRB 220930A: Enhanced Swift-XRT position
  31. GRB 220930A: Prompt enhanced Swift-XRT position
  32. GRB 220930A: Swift detection of a burst
  33. Fermi-LAT gamma-ray observations of IceCube-220928A
  34. Konus-Wind detection of GRB 220927A
  35. IPN triangulation of GRB 220927A (long)
  36. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  37. Analysis of long GRB 220926B detected by INTEGRAL
  38. GRB 220926B
  39. Fermi GRB 220925A: Global MASTER-Net observations report
  40. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  41. Fermi trigger No 685748699: Global MASTER-Net observations report
  42. Konus-Wind detection of GRB 220921A
  43. GRB 220921A: Fermi-LAT detection
  44. Fermi trigger No 685452089: Global MASTER-Net observations report
  45. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  46. IceCube-220907A: No significant detection in HAWC
  47. Konus-Wind detection of GRB 220910A
  48. Fermi GRB 220912A: Global MASTER-Net observations report
  49. GRB 220912A: AstroSat CZTI detection
  50. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  51. GRB 220910A: AstroSat CZTI detection
  52. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  53. GRB 220907A: Swift-XRT position
  54. GRB 220907A: Swift detection of a burst
  55. Fermi GRB 220905A: Global MASTER-Net observations report
  56. Fermi GRB 220902A: Global MASTER-Net observations report
  57. GRB 220831A, VLT/HAWK-I near-infrared observations
  58. Fermi trigger No 683654200: Global MASTER-Net observations report
  59. IceCube-220822A: No significant detection in HAWC
  60. Fermi trigger No 683537972: Global MASTER-Net observations report
  61. Fermi trigger No 683476673: Global MASTER-Net observations report
  62. Konus-Wind detection of GRB 220826A
  63. Fermi trigger No 683202084: Global MASTER-Net observations report
  64. Fermi trigger No 683183601: Global MASTER-Net observations report
  65. GRB 220826A: Swift-XRT refined Analysis
  66. GRB 220826A: Swift detection of a burst with an optical counterpart
  67. GRB 220825A: Swift/BAT-GUANO detection
  68. IceCube-220822A: Upper limits from a search for additional neutrino events in IceCube
  69. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  70. Fermi trigger No 682918137: Global MASTER-Net observations report
  71. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  72. IceCube-220822A - IceCube observation of a high-energy neutrino candidate track-like event
  73. IceCube Alert 220822.85: Global MASTER-Net observations report
  74. Konus-Wind detection of GRB 220813A
  75. GRB 220813A: Swift-XRT refined Analysis
  76. GRB 220813A: Swift detection of a burst with an optical counterpart
  77. Fermi trigger No 681998863: Global MASTER-Net observations report
  78. GRB 220810A: MeerLICHT detection of two afterglow candidates
  79. Fermi trigger No 681890304: Global MASTER-Net observations report
  80. Swift GRB220806.76: Global MASTER-Net observations report
  81. GRB 220803A: AstroSat CZTI detection
  82. Konus-Wind detection of GRB 220730A (short)
  83. GRB 220729A: AstroSat CZTI detection
  84. Fermi trigger No 680782656: Global MASTER-Net observations report
  85. Fermi GRB 220728A: Global MASTER-Net observations report
  86. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  87. GRB 220728A: Fermi GBM Final Real-time Localization
  88. Fermi GRB 220724A: Global MASTER-Net observations report
  89. Introducing new GCN Kafka broker and web site for transient alerts, https://gcn.nasa.gov
  90. GRB 220715B: Swift-BAT refined analysis
  91. GRB 220714B: Swift-XRT refined Analysis
  92. GRB 220714B: Swift detection of a burst
  93. GRB 220714A: Possible Swift detection of a burst
  94. GRB 220710A: Swift-XRT afterglow detection
  95. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  96. GRB 220711B, GROND observations
  97. Konus-Wind detection of GRB 220711C
  98. Fermi trigger No 679248723: Global MASTER-Net observations report
  99. Fermi GRB 220711B: Global MASTER-Net observations report
  100. GRB 220710A: Swift/BAT-GUANO arcminute localization

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