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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"

11649 results found.

  1. GRB 190415A: Insight-HXMT/HE detection
  2. Fermi Trigger 576994194 / GRB 190415173 / : BALROG localization
  3. Fermi GRB190415.17 Global MASTER-Net observations report
  4. GRB 190407B: AstroSat CZTI detection
  5. GRB 190411A: Insight-HXMT/HE detection
  6. LIGO/Virgo S190412m: Fermi-LAT search for a high-energy gamma-ray counterpart
  7. LIGO/Virgo S190412m: Fermi-GBM Observations
  8. IPN triangulation of GRB 190409B (short)
  9. LIGO/Virgo ST190408an: Fermi-LAT search for a high-energy gamma-ray counterpart
  10. LIGO/Virgo S190408an: Fermi GBM Observation
  11. Fermi Gamma-ray Burst Monitor trigger 576420743/190408536 is not a GRB
  12. Fermi TriggNum 576054086 (GRB 1904204.29) / MASTER OT J071404.52+550304.2: CrAO optical observations
  13. Fermi Trigger 576356086 / GRB 190407788 / : BALROG localization
  14. Hard Fermi GRB190404.29/TriggNum576054086: MASTER optical counterpart discovery near PGC020455
  15. Fermi Trigger 576346051 / GRB 190407672 / GRB 190407A: BALROG localization
  16. GRB 140404B: MAXI/GSC detection
  17. GRB 190330A: MITSuME Akeno and Okayama optical upper limits
  18. Konus-Wind observation of GRB 190329A
  19. GRB 190326B: AstroSat CZTI detection
  20. Fermi-LAT Gamma-ray Observations of IceCube-190331A
  21. GRB 190401A: Insight-HXMT/HE detection
  22. GRB 190331A: Insight-HXMT/HE detection
  23. GRB 190330A: Insight-HXMT/HE detection
  24. GRB 190331A: Fermi GBM detection
  25. IPN Triangulation of GRB 190329A (long/bright)
  26. IceCube-190331A - IceCube observation of a high-energy neutrino candidate event
  27. Fermi Trigger 575656777 / GRB 190330694 / GRB 190330A: BALROG localization
  28. GRB 190326B: Insight-HXMT/HE detection
  29. Konus-Wind observation of GRB 190324A
  30. GRB 190326B: Fermi GBM detection
  31. GRB 190324B: Insight-HXMT/HE detection
  32. GRB 190324A: Insight-HXMT/HE detection
  33. Fermi Trigger 575278303 / GRB 190326314 / GRB190326B: BALROG localization
  34. Fermi Trigger 575251142 / GRB 190325999 / GRB 190325A: BALROG localization
  35. GRB 190324A: CALET Gamma-Ray Burst Monitor detection
  36. GRB 190323A: Insight-HXMT/HE detection
  37. GRB 190324A: Fermi GBM observation
  38. Fermi Trigger 575160247 / GRB 190324947: BALROG localization
  39. Fermi Trigger 575108474 / GRB 190324348: BALROG localization
  40. Fermi Trigger 575067924 / GRB 190323879: BALROG localization
  41. Fermi Trigger 575018216 / GRB 190323303: BALROG localization
  42. Fermi Trigger 574850558 / GRB 190321363: BALROG localization
  43. GRB 190320A: Fermi GBM observation
  44. GRB 190320A: Swift detection of a burst
  45. GRB 190315A: AstroSat CZTI detection
  46. Fermi Trigger 574678842 / GRB 190319375: BALROG localization
  47. Fermi Trigger 574676902 / GRB 190319353: BALROG localization
  48. Fermi Trigger 574345067 / GRB 190315512: BALROG localization
  49. Fermi trigger 574140965 / GRB190313.15: MASTER Global Robotic Net optical observation
  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: Fermi GBM observation
  54. IPN Triangulation of GRB 190304A (long)
  55. IPN Triangulation of GRB 190305A
  56. GRB 190226A: Insight-HXMT/HE detection
  57. IceCube-190221A: Fermi-LAT Gamma-ray observations
  58. Fermi-GBM Observations of IceCube-190221A
  59. IceCube-190221A: MASTER Global Robotic Net optical observation
  60. GRB 190220B: Fermi GBM observation
  61. GRB 190215A: AstroSat CZTI detection
  62. GRB 190215A: Insight-HXMT/HE detection
  63. GRB 190215A: Fermi GBM detection
  64. GRB 180703A: VLT/MUSE host galaxy redshift measurement
  65. GRB 190202A: AstroSat CZTI detection
  66. GRB 190202A: Fermi GBM observation
  67. Fermi GBM trigger 570825115/190202772 is not a GRB
  68. Fermi GBM trigger 570716645/190201517 is not a GRB
  69. GRB 190131A: Insight-HXMT/HE detection
  70. Fermi GBM trigger 570659556/190131856 is not a GRB
  71. GRB 190129A: CALET Gamma-Ray Burst Monitor detection
  72. Fermi GBM Observations of IceCube-190124A
  73. GRB 190129A: Fermi GBM detection
  74. Fermi-LAT Gamma-ray Observations of IceCube-190124A
  75. Konus-Wind observation of GRB 190122A
  76. GRB 190123A: Fermi GBM observation
  77. GRB 190122A: Fermi GBM observation
  78. GRB 190122A: Fermi-LAT detection
  79. IPN Triangulation of GRB 190118A (long)
  80. Konus-Wind observation of GRB 190114C
  81. GRB 190114C:Insight-HXMT/HE detection
  82. GRB 190114C: A type 1 BdHN with TeV emission
  83. GRB 190114C: AGILE/MCAL detection
  84. GRB 190114C: Fermi-LAT detection
  85. GRB 190114C: Fermi GBM detection
  86. GRB 190110A：Insight-HXMT/HE detection
  87. Konus-Wind observation of GRB 190110A
  88. GRB 190110A: Fermi GBM detection
  89. GRB 190109B: Fermi GBM observation
  90. GRB 190109A: Fermi GBM observation
  91. GRB 190109B: Swift detection of a burst
  92. CALET Gamma-Ray Burst Monitor: Policy change in the GCN circulars
  93. Fermi GBM Observations of IceCube-190104A
  94. Fermi LAT Gamma-ray Observations of IceCube-190104A
  95. GRB 181231A: BOOTES-2/TELMA optical observations
  96. GRB 181231A: Fermi GBM detection
  97. GRB 181231A: Fermi-LAT detection
  98. GRB 181225A: further Swift-XRT observations
  99. Fermi GBM trigger 567868083/181230547 is not a GRB
  100. GRB 181227A: CALET Gamma-Ray Burst Monitor detection

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