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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"

27297 results found.

  1. GRB 190326B: Insight-HXMT/HE detection
  2. GRB 190326A: Insight-HXMT/HE detection
  3. Swift Trigger 895257: Detection of GRO J2058+42 in outburst
  4. GRB 190326A: MITSuME Okayama optical upper limits
  5. GRB 190324A: Swift/UVOT Observations
  6. GRB 190326B: Fermi GBM detection
  7. GRB 190324B: Insight-HXMT/HE detection
  8. GRB 190324A: Insight-HXMT/HE detection
  9. Fermi Trigger 575278303 / GRB 190326314 / GRB190326B: BALROG localization
  10. GRB 190326A: Swift detection of a short burst
  11. Fermi Trigger 575251142 / GRB 190325999 / GRB 190325A: BALROG localization
  12. GRB 190324A: Swift-BAT refined analysis
  13. GRB 190324A: CALET Gamma-Ray Burst Monitor detection
  14. GRB 190323A: Insight-HXMT/HE detection
  15. GRB 190324A: Swift-XRT refined Analysis
  16. GRB190324A: MASTER OT observations
  17. GRB 190324A: Fermi GBM observation
  18. GRB 190321A: Insight-HXMT/HE detection
  19. GRB 190324A: Swift-XRT observations
  20. GRB 190324A: Swift/UVOT afterglow candidate
  21. SWIFT GRB190324.95 Global MASTER-Net observations report
  22. Fermi Trigger 575160247 / GRB 190324947: BALROG localization
  23. GRB 190324A: Swift detection of a burst
  24. Fermi Trigger 575108474 / GRB 190324348: BALROG localization
  25. SWIFT GRB190323.85 Global MASTER-Net observations report
  26. Fermi Trigger 575067924 / GRB 190323879: BALROG localization
  27. Swift detection of LS I +61 303
  28. Fermi Trigger 575018216 / GRB 190323303: BALROG localization
  29. Swift Trigger 894268: Detection of GRO J2058+42 in outburst
  30. Fermi Trigger 574850558 / GRB 190321363: BALROG localization
  31. GRB 190114C: photometric detection of a SN component
  32. GRB 190320A: Swift/UVOT Upper Limits
  33. GRB 190320A: Swift-XRT refined Analysis
  34. GRB 190320A: Swift-BAT refined analysis
  35. GRB190320A: MASTER GRB counterpart decay
  36. GRB 190320A: Fermi GBM observation
  37. SWIFT GRB190320.05 Global MASTER-Net observations report
  38. GRB 190320A: Swift-XRT observations
  39. GRB 190320A: Swift detection of a burst
  40. Fermi Trigger 574678842 / GRB 190319375: BALROG localization
  41. Fermi Trigger 574676902 / GRB 190319353: BALROG localization
  42. Fermi Trigger 574345067 / GRB 190315512: BALROG localization
  43. GRB190311A: MITSuME Akeno optical observation
  44. Fermi trigger 574140965 / GRB190313.15: MASTER Global Robotic Net optical observation
  45. GRB 190311A: Swift/UVOT Detection
  46. GRB 190311A: NOT optical counterpart
  47. GRB 190311A: Swift-BAT refined analysis
  48. GRB190305A: MASTER Global Robotic Net optical observation
  49. GRB 190311A: Mondy optical observations
  50. Fermi Trigger 574080135 / GRB 190312446: BALROG localization
  51. Improved Fermi/GBM GRB localizations
  52. [Hxmt-ba]GRB 190310A: Insight-HXMT/HE detection
  53. GRB 190311A: GMG observation
  54. GRB 190311A: Fermi GBM observation
  55. GRB 190311A: Swift-XRT refined Analysis
  56. GRB190311A: MASTER Global Robotic Net OT optical observation
  57. GRB 190311A: NEXT-0.6m optical afterglow detection
  58. GRB 190311A: Swift detection of a burst with optical counterpart
  59. GRB 190305A: CALET Gamma-Ray Burst Monitor detection
  60. IPN Triangulation of GRB 190304A (long)
  61. GRB 190306B: Insight-HXMT/HE detection
  62. IPN Triangulation of GRB 190305A
  63. GRB 190305A: Insight-HXMT/HE detection
  64. GRB 190305A: MAXI/GSC detection
  65. Swift Trigger 891843 is not a GRB
  66. GRB 190226A: Insight-HXMT/HE detection
  67. Trigger 890732: Swift detection of MAXI J1631-479
  68. Fermi-GBM Observations of IceCube-190221A
  69. IceCube-190221A: MASTER Global Robotic Net optical observation
  70. GRB 190220B: Fermi GBM observation
  71. GRB 190220A: Swift-XRT refined Analysis
  72. GRB 190220B: BOOTES-4 optical observation
  73. GRB 190220A: Swift-BAT refined analysis
  74. GRB 190219A: Swift-BAT refined analysis
  75. GRB 190219A: Swift-XRT refined Analysis
  76. GRB 190220A: Swift detection of a burst with an optical counterpart
  77. GRB 190219A: CAHA 2.2m observations
  78. GRB190219A: MASTER Global Robotic Net optical observation
  79. GRB 190219A: BOOTES-1 optical limits
  80. GRB 190219A: Swift detection of a burst
  81. GRB 190215A: AstroSat CZTI detection
  82. Trigger 889483: Swift detection of Swift J1858.6-0814
  83. GRB 190215A: Insight-HXMT/HE detection
  84. GRB 190215A: Fermi GBM detection
  85. GRB 190212A: Insight-HXMT/HE detection
  86. GRB 190211A: Swift/UVOT Detection
  87. GRB 190206A: AstroSat CZTI detection
  88. GRB190211A: MITSuME Akeno optical observation
  89. GRB 190211A: NOT optical observations
  90. GRB 190211A: Swift-XRT refined Analysis
  91. GRB 190211A: Swift-BAT refined analysis
  92. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  93. GRB190211A: MASTER Global Robotic Net optical observation
  94. GRB 190211A: NEXT-0.6m optical afterglow detection
  95. GRB 190211A: Swift detection of a burst
  96. Trigger 888312: Swift detection of 4U 1901+03
  97. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  98. GRB 190203A: Swift-BAT refined analysis
  99. GRB 190204A: Swift-BAT refined analysis
  100. GRB190203A: UVOT analysis

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