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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"

15282 results found.

  1. GRB 161106A: Fermi GBM detection
  2. GRB 161104A: Gemini South optical observations
  3. Search for counterpart to IceCube-161103A with ANTARES
  4. Fermi GBM Observations of IceCube-161103
  5. GRB 160928A: The first GRB detected by POLAR
  6. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  7. HAWC follow up of IceCube-161103
  8. IceCube-161103: IceCube observation of a very-high-energy neutrino
  9. Fermi GBM trigger 499467682/161029876 is not a GRB
  10. GRB161023A: AstroSat CZTI detection
  11. Konus-Wind observation of GRB 161023A
  12. GRB 161023A: Watcher optical observations
  13. GRB 161023A: Swift ToO observations
  14. GRB 161023A: A long GRB detected by INTEGRAL
  15. GRB 161022A: Fermi GBM observation
  16. Konus-Wind observation of GRB 161020B
  17. GRB 161020A: A long GRB detected by INTEGRAL
  18. GRB 161015A: further Swift-XRT follow-up observations
  19. Konus-Wind observation of GRB 161017A
  20. GRB 161017A: TNG spectroscopy and redshift confirmation
  21. GRB 161017A: GTC additional spectroscopy and refined redshift
  22. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  23. GRB 161017A: Fermi GBM observation
  24. GRB 161014A: Continued RATIR Optical and NIR Observations
  25. Konus-Wind observation of GRB 161015A
  26. GRB 161014A: VLT/X-shooter redshift confirmation
  27. GRB161015A: AstroSat CZTI detection
  28. Konus-Wind observation of GRB 161014A
  29. GRB 161015A: Fermi GBM detection
  30. GRB 161015A: Tiled Swift observations
  31. GRB 161015A: Fermi-LAT detection
  32. GRB161004A: Further analysis of the burst nature
  33. GRB 161014A: RATIR Optical and NIR Observations
  34. GRB 161014A: Fermi GBM observation
  35. GRB 161014A: Swift/UVOT Detection
  36. GRB 161011A: RATIR Optical and NIR Observations
  37. GRB 161014A: Swift-XRT and UVOT afterglow detection
  38. GRB 161014A: Kanata optical observation
  39. GRB 161014A : Xinglong TNT optical observation
  40. Konus-Wind observation of GRB 161010A
  41. GRB 161010A: Swift ToO observations
  42. GRB 161010A: a long GRB detected by INTEGRAL
  43. GRB 161007A: NOT optical observations
  44. Konus-Wind observation of GRB 161004B
  45. GRB 160927A: GTC observations
  46. GRB 161004B: Fermi GBM detection
  47. GRB161004B: AstroSat CZTI detection
  48. GRB 160917B: Lomonosov BDRG gamma ray discovery
  49. GRB 160917A: Lomonosov BDRG gamma ray detection
  50. GRB 160915A: Lomonosov BDRG gamma ray detection
  51. GRB 161004A: SAO RAS optical upper limit
  52. Konus-Wind observation of GRB 161001A (short/hard ?)
  53. GRB 161001A: GROND afterglow candidate
  54. GRB 161001A: Fermi GBM detection
  55. GRB 160927A: NOT optical observations
  56. GRB 160927A: GROND Observations
  57. GRB 160927A: TNG optical afterglow confirmation
  58. GRB 160927A: RTT150 optical afterglow candidate
  59. GRB160910A: AstroSat CZTI detection
  60. GRB160824B: AstroSat CZTI detection
  61. GRB160917A: AstroSat CZTI detection
  62. GRB 160925A: Swift ToO observations
  63. GRB 160917A: Mondy afterglow confirmation
  64. GRB 160917A: Fermi GBM observation
  65. GRB 160912A: RATIR Optical and NIR Observations
  66. GRB 160912A: Fermi GBM detection
  67. Konus-Wind observation of GRB 160910A
  68. GRB 160910A: Correction to GCN 19904
  69. GRB 160910A: XRT results and corrections to GCN 19905 & 19906
  70. GRB 160910A: NOT afterglow confirmation
  71. GRB 160910A: Tiled Swift observations
  72. GRB 160908A: CALET Gamma-Ray Burst Monitor detection
  73. GRB 160910A: Fermi-LAT detection
  74. GRB 160910A: Fermi GBM observation
  75. Konus-Wind observation of GRB 160905A
  76. GRB 160905A: Fermi-LAT detection
  77. GRB 160905A: Fermi GBM observation
  78. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  79. Search for counterpart to IceCube-160814A with ANTARES
  80. GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
  81. GRB 160829A: Fermi GBM Detection
  82. GRB 160829A: Swift ToO observations
  83. GRB 160829A: Fermi-LAT detection of a short GRB
  84. GRB 160825A: not localized by Swift
  85. GRB160821A: Astrosat CZTI (veto) detection
  86. GRB 160825A: Swift ToO observations
  87. GRB 160824A: ISON/Terskol optical observations
  88. GRB 160824B: Fermi GBM detection
  89. Konus-Wind observation of GRB 160822A
  90. Konus-Wind observation of GRB 160820A
  91. GRB 160821B: GTC follow-up observation
  92. GRB 160822672: Fermi GBM detection
  93. GRB 160821B: Fermi GBM Detection
  94. Konus-Wind observation of GRB 160821A
  95. GRB 160821A: Fermi-LAT refined analysis
  96. GRB 160821B: NOT optical afterglow candidate
  97. GRB 160821A: Fermi-LAT detection of a bright burst
  98. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  99. BAT detection and localization of GRB 160819A
  100. GRB 160819A: Fermi GBM detection

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