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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"

19663 results found.

  1. IPN triangulation of GRB 190409B (short)
  2. IceCube-190331A: Swift-XRT Follow-up Observations
  3. GRB 190409A: ground analysis reveals a likely spurious event
  4. GRB 190404C: MITSuME Akeno and Okayama optical upper limits
  5. GRB 190409A: Swift detection of a possible burst
  6. LIGO/Virgo S190408an: Swift/BAT data search
  7. GRB 190404C: Swift-XRT afterglow detection
  8. GRB 190404C: Swift-XRT observations
  9. Swift GRB 190331B: Further Swift-XRT observations
  10. GRB 190404B: Tiled Swift observations
  11. Trigger 896552: Swift detection of PSR B1055-52
  12. GRB 190331B: BOOTES-3/YA optical observations
  13. GRB 190331B: Swift observations of a ground-detected burst
  14. GRB 190331A: Insight-HXMT/HE detection
  15. GRB 190331A: Fermi GBM detection
  16. GRB 190331B: Swift ToO observations
  17. GRB 190331A, Swift-BAT refined analysis
  18. GRB 190331A: Swift detection of a burst
  19. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  20. GRB 190326A: 2.2m CAHA telescope optical limit
  21. Swift Trigger 895503 is not a GRB
  22. Swift Trigger 895479: Detection of GRO J2058+42
  23. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  24. GRB 190326A: Insight-HXMT/HE detection
  25. Swift Trigger 895257: Detection of GRO J2058+42 in outburst
  26. GRB 190326A: MITSuME Okayama optical upper limits
  27. Konus-Wind observation of GRB 190324A
  28. GRB 190324A: Swift/UVOT Observations
  29. GRB 190324A: Insight-HXMT/HE detection
  30. Fermi Trigger 575278303 / GRB 190326314 / GRB190326B: BALROG localization
  31. GRB 190326A: Swift detection of a short burst
  32. GRB 190324A: Swift-BAT refined analysis
  33. GRB 190324A: CALET Gamma-Ray Burst Monitor detection
  34. GRB 190324A: Swift-XRT refined Analysis
  35. GRB190324A: MASTER OT observations
  36. GRB 190324A: Fermi GBM observation
  37. GRB 190324A: Enhanced Swift-XRT position
  38. GRB 190324A: Swift-XRT observations
  39. GRB 190324A: Swift/UVOT afterglow candidate
  40. SWIFT GRB190324.95 Global MASTER-Net observations report
  41. GRB 190324A: Swift detection of a burst
  42. SWIFT GRB190323.85 Global MASTER-Net observations report
  43. Swift detection of LS I +61 303
  44. Swift Trigger 894268: Detection of GRO J2058+42 in outburst
  45. GRB 190320A: Swift/UVOT Upper Limits
  46. GRB 190320A: Swift-XRT refined Analysis
  47. GRB 190320A: Swift-BAT refined analysis
  48. GRB190320A: MASTER GRB counterpart decay
  49. GRB 190320A: Fermi GBM observation
  50. GRB 190320A: Enhanced Swift-XRT position
  51. GRB190320A: MASTER OT detection
  52. SWIFT GRB190320.05 Global MASTER-Net observations report
  53. GRB 190320A: Swift-XRT observations
  54. GRB 190320A: Swift detection of a burst
  55. GRB 190311A: OSN optical afterglow detection
  56. GRB 190311A: Swift/UVOT Detection
  57. GRB 190311A: Liverpool Telescope observations
  58. GRB 190311A: Swift-BAT refined analysis
  59. GRB190305A: MASTER Global Robotic Net optical observation
  60. GRB 190311A: Fermi GBM observation
  61. GRB 190311A: Swift-XRT refined Analysis
  62. GRB 190311A: Enhanced Swift-XRT position
  63. GRB190311A: MASTER Global Robotic Net OT optical observation
  64. GRB 190311A: NEXT-0.6m optical afterglow detection
  65. GRB 190311A: Swift detection of a burst with optical counterpart
  66. GRB 190305A: Swift-XRT afterglow detection
  67. IPN Triangulation of GRB 190304A (long)
  68. GRB 190306A: Swift-XRT observations
  69. GRB 190306A: Tiled Swift observations
  70. IPN Triangulation of GRB 190305A
  71. GRB 190305A: Swift-XRT observations
  72. Swift Trigger 891843 is not a GRB
  73. GRB 190305A: Tiled Swift observations
  74. Trigger 890732: Swift detection of MAXI J1631-479
  75. IceCube-190221A: Swift-XRT Follow-up Observations
  76. GRB 190220A: Swift-XRT refined Analysis
  77. GRB 190220A: Swift-BAT refined analysis
  78. GRB 190219A: Swift-BAT refined analysis
  79. GRB 190220A: Enhanced Swift-XRT position
  80. GRB 190219A: NOT optical afterglow candidate
  81. GRB 190219A: Swift-XRT refined Analysis
  82. GRB 190220A: Swift detection of a burst with an optical counterpart
  83. GRB 190219A: Enhanced Swift-XRT position
  84. GRB 190219A: CAHA 2.2m observations
  85. GRB190219A: MASTER Global Robotic Net optical observation
  86. GRB 190219A: BOOTES-1 optical limits
  87. GRB 190219A: Prompt enhanced Swift-XRT position
  88. GRB 190219A: Swift detection of a burst
  89. Trigger 889483: Swift detection of Swift J1858.6-0814
  90. GRB 190211A: Swift/UVOT Detection
  91. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  92. GRB 190211A: Swift-XRT refined Analysis
  93. GRB 190211A: Swift-BAT refined analysis
  94. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  95. GRB190211A: MASTER Global Robotic Net optical observation
  96. GRB 190211A: Swift detection of a burst
  97. Trigger 888312: Swift detection of 4U 1901+03
  98. IPN Triangulation of GRB 190206A (short/extremely bright)
  99. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  100. GRB 190202A: AstroSat CZTI detection

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