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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"

37771 results found.

  1. GRB 190331A: Fermi GBM detection
  2. GRB 190331B: Swift ToO observations
  3. GRB 190331A, Swift-BAT refined analysis
  4. IPN Triangulation of GRB 190329A (long/bright)
  5. IceCube-190331A - IceCube observation of a high-energy neutrino candidate event
  6. GRB 190331A: Swift detection of a burst
  7. Fermi Trigger 575656777 / GRB 190330694 / GRB 190330A: BALROG localization
  8. GRB 190323A: AstroSat CZTI detection
  9. GRB 190326A: 2.2m CAHA telescope optical limit
  10. Swift Trigger 895503 is not a GRB
  11. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  12. GRB 190326B: Insight-HXMT/HE detection
  13. GRB 190326A: Insight-HXMT/HE detection
  14. GRB 190326A: MITSuME Okayama optical upper limits
  15. Konus-Wind observation of GRB 190324A
  16. GRB 190324A: Swift/UVOT Observations
  17. GRB 190326B: Fermi GBM detection
  18. GRB 190324B: Insight-HXMT/HE detection
  19. GRB 190324A: Insight-HXMT/HE detection
  20. Fermi Trigger 575278303 / GRB 190326314 / GRB190326B: BALROG localization
  21. GRB 190326A: Swift detection of a short burst
  22. Fermi Trigger 575251142 / GRB 190325999 / GRB 190325A: BALROG localization
  23. GRB 190324A: Swift-BAT refined analysis
  24. GRB 190324A: CALET Gamma-Ray Burst Monitor detection
  25. GRB 190323A: Insight-HXMT/HE detection
  26. GRB 190324A: Swift-XRT refined Analysis
  27. GRB190324A: MASTER OT observations
  28. GRB 190324A: Fermi GBM observation
  29. GRB 190324A: Enhanced Swift-XRT position
  30. GRB 190324A: VLT/X-shooter redshift
  31. GRB 190321A: Insight-HXMT/HE detection
  32. GRB 190324A: Swift-XRT observations
  33. GRB 190324A: Swift/UVOT afterglow candidate
  34. Fermi Trigger 575160247 / GRB 190324947: BALROG localization
  35. GRB 190324A: Swift detection of a burst
  36. Fermi Trigger 575108474 / GRB 190324348: BALROG localization
  37. Fermi Trigger 575067924 / GRB 190323879: BALROG localization
  38. Fermi Trigger 575018216 / GRB 190323303: BALROG localization
  39. Fermi Trigger 574850558 / GRB 190321363: BALROG localization
  40. GRB 190114C: photometric detection of a SN component
  41. GRB 190320A: Swift/UVOT Upper Limits
  42. GRB 190320A: Swift-XRT refined Analysis
  43. GRB 190320A: Swift-BAT refined analysis
  44. GRB190320A: MASTER GRB counterpart decay
  45. GRB 190320A: Fermi GBM observation
  46. GRB 190320A: Enhanced Swift-XRT position
  47. GRB190320A: MASTER OT detection
  48. GRB 190320A: Swift-XRT observations
  49. GRB 190320A: Swift detection of a burst
  50. GRB 190315A: AstroSat CZTI detection
  51. Fermi Trigger 574678842 / GRB 190319375: BALROG localization
  52. Fermi Trigger 574676902 / GRB 190319353: BALROG localization
  53. Fermi Trigger 574345067 / GRB 190315512: BALROG localization
  54. GRB190311A: MITSuME Akeno optical observation
  55. Fermi trigger 574140965 / GRB190313.15: MASTER Global Robotic Net optical observation
  56. GRB 190311A: OSN optical afterglow detection
  57. GRB 190311A: Swift/UVOT Detection
  58. GRB 190311A: Mondy optical observations
  59. GRB 190311A: Liverpool Telescope observations
  60. GRB 190311A: NOT optical counterpart
  61. GRB 190311A: Swift-BAT refined analysis
  62. GRB190305A: MASTER Global Robotic Net optical observation
  63. GRB 190311A: Mondy optical observations
  64. Fermi Trigger 574080135 / GRB 190312446: BALROG localization
  65. Improved Fermi/GBM GRB localizations
  66. [Hxmt-ba]GRB 190310A: Insight-HXMT/HE detection
  67. GRB 190311A: GMG observation
  68. GRB 190311A: Fermi GBM observation
  69. GRB 190311A: Swift-XRT refined Analysis
  70. GRB 190311A: TSHAO optical observations
  71. GRB 190311A: Enhanced Swift-XRT position
  72. GRB 190311A: NEXT-0.6m optical afterglow detection
  73. GRB 190311A: Mondy optical observations
  74. GRB 190311A: Swift detection of a burst with optical counterpart
  75. GRB 190305A: Swift-XRT afterglow detection
  76. GRB 190305A: CALET Gamma-Ray Burst Monitor detection
  77. Konus-Wind observation of GRB 190304A
  78. IPN Triangulation of GRB 190304A (long)
  79. GRB 190306A: Swift-XRT observations
  80. GRB 190306B: Insight-HXMT/HE detection
  81. Konus-Wind observation of GRB 190305A
  82. GRB 190306A: Tiled Swift observations
  83. GRB 190306A: MAXI/GSC detection
  84. IPN Triangulation of GRB 190305A
  85. GRB 190305A: Swift-XRT observations
  86. GRB 190305A: Insight-HXMT/HE detection
  87. GRB 190305A: MAXI/GSC detection
  88. Swift Trigger 891843 is not a GRB
  89. GRB 190305A: Tiled Swift observations
  90. GRB 190305A: AGILE/MCAL detection of a burst
  91. GRB 190226A: Insight-HXMT/HE detection
  92. INTEGRAL observation of IceCube-190221A
  93. IceCube-190221A: Fermi-LAT Gamma-ray observations
  94. Fermi-GBM Observations of IceCube-190221A
  95. IceCube-190221A: MASTER Global Robotic Net optical observation
  96. GRB 190220B: Fermi GBM observation
  97. GRB 190219A: CrAO and AbAO optical upper limit
  98. GRB 190220B: Kitab Observatory optical upper limit
  99. GRB 190220A: Swift-XRT refined Analysis
  100. GRB 190220B: BOOTES-4 optical observation

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