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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"

19662 results found.

  1. IceCube-190331A: Swift-XRT Follow-up Observations
  2. GRB 190409A: ground analysis reveals a likely spurious event
  3. GRB 190404C: MITSuME Akeno and Okayama optical upper limits
  4. GRB 190409A: Swift detection of a possible burst
  5. LIGO/Virgo S190408an: Swift/BAT data search
  6. GRB 190404C: Swift-XRT afterglow detection
  7. GRB 190404C: Swift-XRT observations
  8. Swift GRB 190331B: Further Swift-XRT observations
  9. GRB 190404B: Tiled Swift observations
  10. Trigger 896552: Swift detection of PSR B1055-52
  11. GRB 190331B: BOOTES-3/YA optical observations
  12. GRB 190331B: Swift observations of a ground-detected burst
  13. GRB 190331A: Insight-HXMT/HE detection
  14. GRB 190331A: Fermi GBM detection
  15. GRB 190331B: Swift ToO observations
  16. GRB 190331A, Swift-BAT refined analysis
  17. GRB 190331A: Swift detection of a burst
  18. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  19. GRB 190326A: 2.2m CAHA telescope optical limit
  20. Swift Trigger 895503 is not a GRB
  21. Swift Trigger 895479: Detection of GRO J2058+42
  22. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  23. GRB 190326A: Insight-HXMT/HE detection
  24. Swift Trigger 895257: Detection of GRO J2058+42 in outburst
  25. GRB 190326A: MITSuME Okayama optical upper limits
  26. Konus-Wind observation of GRB 190324A
  27. GRB 190324A: Swift/UVOT Observations
  28. GRB 190324A: Insight-HXMT/HE detection
  29. Fermi Trigger 575278303 / GRB 190326314 / GRB190326B: BALROG localization
  30. GRB 190326A: Swift detection of a short burst
  31. GRB 190324A: Swift-BAT refined analysis
  32. GRB 190324A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 190324A: Swift-XRT refined Analysis
  34. GRB190324A: MASTER OT observations
  35. GRB 190324A: Fermi GBM observation
  36. GRB 190324A: Enhanced Swift-XRT position
  37. GRB 190324A: Swift-XRT observations
  38. GRB 190324A: Swift/UVOT afterglow candidate
  39. SWIFT GRB190324.95 Global MASTER-Net observations report
  40. GRB 190324A: Swift detection of a burst
  41. SWIFT GRB190323.85 Global MASTER-Net observations report
  42. Swift detection of LS I +61 303
  43. Swift Trigger 894268: Detection of GRO J2058+42 in outburst
  44. GRB 190320A: Swift/UVOT Upper Limits
  45. GRB 190320A: Swift-XRT refined Analysis
  46. GRB 190320A: Swift-BAT refined analysis
  47. GRB190320A: MASTER GRB counterpart decay
  48. GRB 190320A: Fermi GBM observation
  49. GRB 190320A: Enhanced Swift-XRT position
  50. GRB190320A: MASTER OT detection
  51. SWIFT GRB190320.05 Global MASTER-Net observations report
  52. GRB 190320A: Swift-XRT observations
  53. GRB 190320A: Swift detection of a burst
  54. GRB 190311A: OSN optical afterglow detection
  55. GRB 190311A: Swift/UVOT Detection
  56. GRB 190311A: Liverpool Telescope observations
  57. GRB 190311A: Swift-BAT refined analysis
  58. GRB190305A: MASTER Global Robotic Net optical observation
  59. GRB 190311A: Fermi GBM observation
  60. GRB 190311A: Swift-XRT refined Analysis
  61. GRB 190311A: Enhanced Swift-XRT position
  62. GRB190311A: MASTER Global Robotic Net OT optical observation
  63. GRB 190311A: NEXT-0.6m optical afterglow detection
  64. GRB 190311A: Swift detection of a burst with optical counterpart
  65. GRB 190305A: Swift-XRT afterglow detection
  66. IPN Triangulation of GRB 190304A (long)
  67. GRB 190306A: Swift-XRT observations
  68. GRB 190306A: Tiled Swift observations
  69. IPN Triangulation of GRB 190305A
  70. GRB 190305A: Swift-XRT observations
  71. Swift Trigger 891843 is not a GRB
  72. GRB 190305A: Tiled Swift observations
  73. Trigger 890732: Swift detection of MAXI J1631-479
  74. IceCube-190221A: Swift-XRT Follow-up Observations
  75. GRB 190220A: Swift-XRT refined Analysis
  76. GRB 190220A: Swift-BAT refined analysis
  77. GRB 190219A: Swift-BAT refined analysis
  78. GRB 190220A: Enhanced Swift-XRT position
  79. GRB 190219A: NOT optical afterglow candidate
  80. GRB 190219A: Swift-XRT refined Analysis
  81. GRB 190220A: Swift detection of a burst with an optical counterpart
  82. GRB 190219A: Enhanced Swift-XRT position
  83. GRB 190219A: CAHA 2.2m observations
  84. GRB190219A: MASTER Global Robotic Net optical observation
  85. GRB 190219A: BOOTES-1 optical limits
  86. GRB 190219A: Prompt enhanced Swift-XRT position
  87. GRB 190219A: Swift detection of a burst
  88. Trigger 889483: Swift detection of Swift J1858.6-0814
  89. GRB 190211A: Swift/UVOT Detection
  90. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  91. GRB 190211A: Swift-XRT refined Analysis
  92. GRB 190211A: Swift-BAT refined analysis
  93. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  94. GRB190211A: MASTER Global Robotic Net optical observation
  95. GRB 190211A: Swift detection of a burst
  96. Trigger 888312: Swift detection of 4U 1901+03
  97. IPN Triangulation of GRB 190206A (short/extremely bright)
  98. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 190202A: AstroSat CZTI detection
  100. GRB 190203A: Swift-BAT refined analysis

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