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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"

36143 results found.

  1. GRB 190324A: VLT/X-shooter redshift
  2. GRB 190321A: Insight-HXMT/HE detection
  3. GRB 190324A: Swift-XRT observations
  4. GRB 190324A: Swift/UVOT afterglow candidate
  5. Fermi Trigger 575160247 / GRB 190324947: BALROG localization
  6. GRB 190324A: Swift detection of a burst
  7. Fermi Trigger 575108474 / GRB 190324348: BALROG localization
  8. Fermi Trigger 575067924 / GRB 190323879: BALROG localization
  9. Fermi Trigger 575018216 / GRB 190323303: BALROG localization
  10. Fermi Trigger 574850558 / GRB 190321363: BALROG localization
  11. GRB 190114C: photometric detection of a SN component
  12. GRB 190320A: Swift/UVOT Upper Limits
  13. GRB 190320A: Swift-XRT refined Analysis
  14. GRB 190320A: Swift-BAT refined analysis
  15. GRB190320A: MASTER GRB counterpart decay
  16. GRB 190320A: Fermi GBM observation
  17. GRB 190320A: Enhanced Swift-XRT position
  18. GRB190320A: MASTER OT detection
  19. GRB 190320A: Swift-XRT observations
  20. GRB 190320A: Swift detection of a burst
  21. GRB 190315A: AstroSat CZTI detection
  22. Fermi Trigger 574678842 / GRB 190319375: BALROG localization
  23. Fermi Trigger 574676902 / GRB 190319353: BALROG localization
  24. Fermi Trigger 574345067 / GRB 190315512: BALROG localization
  25. GRB190311A: MITSuME Akeno optical observation
  26. GRB 190311A: OSN optical afterglow detection
  27. GRB 190311A: Swift/UVOT Detection
  28. GRB 190311A: Mondy optical observations
  29. GRB 190311A: Liverpool Telescope observations
  30. GRB 190311A: NOT optical counterpart
  31. GRB 190311A: Swift-BAT refined analysis
  32. GRB190305A: MASTER Global Robotic Net optical observation
  33. GRB 190311A: Mondy optical observations
  34. Fermi Trigger 574080135 / GRB 190312446: BALROG localization
  35. Improved Fermi/GBM GRB localizations
  36. [Hxmt-ba]GRB 190310A: Insight-HXMT/HE detection
  37. GRB 190311A: GMG observation
  38. GRB 190311A: Fermi GBM observation
  39. GRB 190311A: Swift-XRT refined Analysis
  40. GRB 190311A: TSHAO optical observations
  41. GRB 190311A: Enhanced Swift-XRT position
  42. GRB 190311A: NEXT-0.6m optical afterglow detection
  43. GRB 190311A: Mondy optical observations
  44. GRB 190311A: Swift detection of a burst with optical counterpart
  45. GRB 190305A: Swift-XRT afterglow detection
  46. GRB 190305A: CALET Gamma-Ray Burst Monitor detection
  47. Konus-Wind observation of GRB 190304A
  48. IPN Triangulation of GRB 190304A (long)
  49. GRB 190306A: Swift-XRT observations
  50. GRB 190306B: Insight-HXMT/HE detection
  51. Konus-Wind observation of GRB 190305A
  52. GRB 190306A: Tiled Swift observations
  53. GRB 190306A: MAXI/GSC detection
  54. IPN Triangulation of GRB 190305A
  55. GRB 190305A: Swift-XRT observations
  56. GRB 190305A: Insight-HXMT/HE detection
  57. GRB 190305A: MAXI/GSC detection
  58. Swift Trigger 891843 is not a GRB
  59. GRB 190305A: Tiled Swift observations
  60. GRB 190305A: AGILE/MCAL detection of a burst
  61. GRB 190226A: Insight-HXMT/HE detection
  62. INTEGRAL observation of IceCube-190221A
  63. GRB 190220B: Fermi GBM observation
  64. GRB 190219A: CrAO and AbAO optical upper limit
  65. GRB 190220B: Kitab Observatory optical upper limit
  66. GRB 190220A: Swift-XRT refined Analysis
  67. GRB 190220B: BOOTES-4 optical observation
  68. GRB 190220B: a long GRB detected by IBAS
  69. GRB 190220A: Swift-BAT refined analysis
  70. GRB 190219A: Swift-BAT refined analysis
  71. GRB 190220A: Enhanced Swift-XRT position
  72. GRB 190219A: NOT optical afterglow candidate
  73. GRB 190219A: NEXT-0.6m optical upper limit
  74. GRB 190219A: Swift-XRT refined Analysis
  75. GRB 190220A: Swift detection of a burst with an optical counterpart
  76. GRB 190219A: Enhanced Swift-XRT position
  77. GRB 190219A: CAHA 2.2m observations
  78. GRB 190219A: BOOTES-1 optical limits
  79. GRB 190219A: Prompt enhanced Swift-XRT position
  80. GRB 190219A: Swift detection of a burst
  81. GRB 190215A: AstroSat CZTI detection
  82. GRB 190215A: Insight-HXMT/HE detection
  83. GRB 190215A: Fermi GBM detection
  84. GRB 190212A: Insight-HXMT/HE detection
  85. GRB190211A: GROWTH-India detection of optical afterglow
  86. GRB 190211A: Tautenburg observations
  87. GRB 190211A: Swift/UVOT Detection
  88. GRB 190211A: DOAO optical observation
  89. GRB 190206A: AstroSat CZTI detection
  90. GRB190211A: MITSuME Akeno optical observation
  91. GRB 190211A: NOT optical observations
  92. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  93. GRB 190211A: Swift-XRT refined Analysis
  94. GRB 190211A: Swift-BAT refined analysis
  95. GRB 190211A: BOOTES-4/MET optical afterglow confirmation
  96. GRB 190211A: NEXT-0.6m optical afterglow detection
  97. GRB 190211A: Swift detection of a burst
  98. GRB 190202A: Terskol 2-m optical observations
  99. Konus-Wind observation of GRB 190206A
  100. IPN Triangulation of GRB 190206A (short/extremely bright)

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