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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

11546 results found.

  1. IceCube-190819A: Upper limits from Fermi-GBM Observations
  2. IceCube-190819A - IceCube observation of a high-energy neutrino candidate event
  3. LIGO/Virgo S190814bv: DESGW candidate update
  4. Fermi trigger No 587775150 Global MASTER-Net observations report
  5. GRB 190817A: Fermi GBM Final Real-time Localization
  6. LIGO/Virgo S190814bv: Fermi-LAT search for a high-energy gamma-ray counterpart
  7. LIGO/Virgo S190814bv: New candidates from DECam DESGW difference imaging search
  8. GRB 190813A: Insight-HXMT/HE detection
  9. GRB 190814A: Insight-HXMT/HE detection
  10. LIGO/Virgo S190814bv: No candidates identified in DECam data by visual inspection
  11. Fermi trigger No 587505927 Global MASTER-Net observations report
  12. LIGO/Virgo S190814bv: Candidates found in initial DESGW search
  13. IPN triangulation of GRB 190813A (short)
  14. LIGO/Virgo S190814bv: Upper limits from Fermi-GBM Observations
  15. GRB 190814A: Fermi GBM Final Real-time Localization
  16. Fermi trigger No 587392154 Global MASTER-Net observations report
  17. GRB 190813A: Fermi GBM Final Real-time Localization
  18. IPN triangulation of GRB 190805B
  19. IPN triangulation of GRB 190810A (short)
  20. Fermi trigger No 587084236 Global MASTER-Net observations report
  21. GRB 190810A: Fermi GBM Final Real-time Localization
  22. HAWC-190806A: Upper limits from Fermi-GBM Observations
  23. GRB 190726A: Insight-HXMT/HE detection
  24. LIGO/Virgo S190728q: New optical candidates from the DESGW program
  25. GRB 190808B: BALROG localization (Fermi Trigger 586980202 / GRB 190808752)
  26. Fermi trigger No 586980202 Global MASTER-Net observations report
  27. GRB 190808B: Fermi GBM Final Real-time Localization
  28. GRB 190808A: Fermi GBM Final Real-time Localization
  29. GRB 190804A: AstroSat CZTI detection
  30. Fermi trigger No 586896678 Global MASTER-Net observations report
  31. GRB 190805B: AstroSat CZTI detection
  32. Konus-Wind observation of GRB 190805B
  33. Fermi trigger No 586788607 Global MASTER-Net observations report
  34. Fermi trigger No 586800758 Global MASTER-Net observations report
  35. GRB 190806A: Fermi GBM Final Real-time Localization
  36. Fermi trigger No 586676451 Global MASTER-Net observations report
  37. GRB 190805B: Fermi GBM detection
  38. Konus-Wind observation of GRB 190731A
  39. GRB 190805B: BALROG localization (Fermi Trigger 586673165 / GRB 190805199)
  40. GRB 190805B: MAXI/GSC detection
  41. GRB 190805B: Fermi GBM Final Real-time Localization
  42. GRB 190805A: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 586638042 Global MASTER-Net observations report
  44. Fermi trigger No 586600841 Global MASTER-Net observations report
  45. GRB 190804C: BALROG localization (Fermi Trigger 586638042 / GRB 190804792)
  46. GRB 190804C: Fermi GBM Final Real-time Localization
  47. Fermi trigger No 586574612 Global MASTER-Net observations report
  48. GRB 190804A: Fermi GBM Final Real-time Localization
  49. GRB 190731A: AstroSat CZTI detection
  50. GRB 190731A: no OT detected by MASTER
  51. GRB 190720B: AstroSat CZTI detection
  52. GRB 190731A: Swift-XRT afterglow detection
  53. IPN Triangulation of GRB 190731A
  54. GRB 190731A: Fermi GBM detection
  55. GRB 190726B: AstroSat CZTI detection
  56. GRB 190731A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 190731A: Swift ToO observations
  58. GRB190731A: Fermi-LAT detection
  59. Fermi trigger No 586305505 Global MASTER-Net observations report
  60. Fermi trigger No 586305505 Global MASTER-Net observations report
  61. GRB 190731A: Fermi GBM Final Real-time Localization
  62. Fermi-LAT Gamma-ray Observations of IceCube-190730A
  63. Fermi trigger No 586240252 Global MASTER-Net observations report
  64. IceCube 190730A: not observable by Fermi-GBM
  65. IceCube-190730A - IceCube observation of a high-energy neutrino candidate event
  66. Fermi Gamma-ray Burst Monitor trigger 190729668/586108936 is not a GRB
  67. Konus-Wind observation of GRB 190727B
  68. IPN triangulation of GRB 190728A (short)
  69. LIGO/Virgo S190728q: No counterpart candidates in Fermi-LAT observations
  70. LIGO/Virgo S190728q: Upper limits from Fermi-GBM Observations
  71. GRB 190727B: Fermi-LAT detection
  72. Fermi trigger No 585988241 Global MASTER-Net observations report
  73. GRB 190728A: Fermi GBM Final Real-time Localization
  74. GRB 190727B: Fermi GBM observations
  75. GRB 190727B: BALROG localization (Fermi Trigger 585951481 / GRB 190727846)
  76. GRB 190727B: Fermi GBM Final Real-time Localization
  77. GRB 190727A: BALROG localization (Fermi Trigger 585936117 / GRB 190727668)
  78. GRB 190727A: Fermi GBM Final Real-time Localization
  79. LIGO/Virgo S190727h: No counterpart candidates in Fermi-LAT observations
  80. LIGO/Virgo S190727h: Upper limits from Fermi-GBM Observations
  81. Fermi trigger No 585864875 Global MASTER-Net observations report
  82. Fermi trigger No 585847498 Global MASTER-Net observations report
  83. GRB 190726B: BALROG localization (Fermi Trigger 585864875 / GRB 190726843)
  84. GRB 190726B: Fermi GBM Final Real-time Localization
  85. Fermi trigger No 585856427 Global MASTER-Net observations report
  86. GRB 190726A: BALROG localization (Fermi Trigger 585847498 / GRB 190726642)
  87. GRB 190726A: Fermi GBM Final Real-time Localization
  88. GRB 190724A: Insight-HXMT/HE detection
  89. GRB 190723A: Insight-HXMT/HE detection
  90. GRB 190720A: CALET Gamma-Ray Burst Monitor detection
  91. IPN triangulation of GRB 190724A (short)
  92. Fermi trigger No 585621841 Global MASTER-Net observations report
  93. GRB 190724A: Fermi GBM Final Real-time Localization
  94. Fermi trigger No 585559462 Global MASTER-Net observations report
  95. GRB 190723A: Fermi GBM Final Real-time Localization
  96. IPN triangulation of GRB 190720A
  97. GRB 190720B: Insight-HXMT/HE detection
  98. LIGO/Virgo S190720a: No counterpart candidates in Fermi-LAT observations
  99. GRB 190720B: Fermi GBM Final Real-time Localization
  100. GRB 190720A: Fermi GBM detection

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