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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"

24601 results found.

  1. GRB 190311A: Fermi GBM observation
  2. GRB190311A: MASTER Global Robotic Net OT optical observation
  3. GRB 190311A: Swift detection of a burst with optical counterpart
  4. Konus-Wind observation of GRB 190304A
  5. IPN Triangulation of GRB 190304A (long)
  6. GRB 190306A: Swift-XRT observations
  7. Konus-Wind observation of GRB 190305A
  8. IPN Triangulation of GRB 190305A
  9. GRB 190305A: Swift-XRT observations
  10. GRB 190305A: MAXI/GSC detection
  11. INTEGRAL observation of IceCube-190221A
  12. Search for additional neutrino events from the direction of IceCube-190221A with IceCube
  13. IceCube-190221A: Swift-XRT Follow-up Observations
  14. IceCube-190221A: Fermi-LAT Gamma-ray observations
  15. IceCube-190221A: MASTER Global Robotic Net optical observation
  16. GRB 190220B: Fermi GBM observation
  17. GRB 190220B: Kitab Observatory optical upper limit
  18. IceCube-190221A - IceCube observation of a high-energy neutrino candidate event
  19. GRB 190220B: a long GRB detected by IBAS
  20. GRB 190220A: Swift-BAT refined analysis
  21. GRB 190219A: Swift-BAT refined analysis
  22. GRB190219A: MASTER Global Robotic Net optical observation
  23. GRB 190215A: AstroSat CZTI detection
  24. GRB 190215A: Fermi GBM detection
  25. GRB 190206A: AstroSat CZTI detection
  26. GRB190211A: MITSuME Akeno optical observation
  27. GRB 190211A: Swift-BAT refined analysis
  28. GRB190211A: MASTER Global Robotic Net optical observation
  29. GRB 190211A: Swift detection of a burst
  30. Trigger 888312: Swift detection of 4U 1901+03
  31. Konus-Wind observation of GRB 190206A
  32. IPN Triangulation of GRB 190206A (short/extremely bright)
  33. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  34. Retraction of IceCube GCN/AMON NOTICE 36142391_132143
  35. GRB 190203A: Swift-BAT refined analysis
  36. GRB 190204A: Swift-BAT refined analysis
  37. GRB 190202A: SAO RAS further optical observations
  38. Konus-Wind observation of GRB 190204A
  39. GRB 190204A: SAO RAS optical observations
  40. GRB 190204A: Mondy optical upper limit
  41. Konus-Wind observation of GRB 190203A
  42. GRB 190203A: Swift-XRT refined Analysis
  43. GRB 190204A: Swift-XRT refined Analysis
  44. GRB 190204A: MAXI/GSC detection
  45. GRB 190202A: R and I band observation from HCT
  46. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  47. Swift Trigger 887541: MASTER optical observation
  48. GRB 190203A: MASTER OT detection
  49. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  50. GRB 190202A: LCO-CTIO optical observations
  51. GRB 190202A: Fermi GBM observation
  52. GRB 190202A, Swift-BAT refined analysis
  53. GRB 190202A: AGILE ratemeters detection
  54. GRB 190129B: Swift-XRT candidate afterglow detection
  55. Fermi GBM Observations of IceCube-190124A
  56. GRB 190129A: Fermi GBM detection
  57. Konus-Wind observation of extremely bright GRB 190129B
  58. IPN Triangulation of GRB 190129B (long/extremely bright)
  59. INTEGRAL observation of IceCube-190124A
  60. Swift Trigger 886157: MASTER optical observation
  61. Swift Trigger 886157: Swift detection of a new transient Swift J1728.9-3613
  62. Trigger 885807: Swift detection of MAXI J1348-630
  63. Search for counterparts to IceCube-190124A with IceCube
  64. Search for counterpart to IceCube-190124A with ANTARES
  65. Fermi-LAT Gamma-ray Observations of IceCube-190124A
  66. IceCube-190124A - IceCube observation of a high-energy neutrino candidate event
  67. Konus-Wind observation of GRB 190122A
  68. Konus-Wind of observation of GRB 190117A
  69. GRB 190123A: Swift-BAT refined analysis
  70. GRB190123A: MITSuME Akeno optical upper limits
  71. Trigger 885456: Swift detection of MAXI J1631-479
  72. GRB 190123A: Fermi GBM observation
  73. GRB 190123A: MASTER Global Robotic Net optical observation
  74. GRB 190123A: Swift detection of a burst
  75. GRB 190122A: Fermi GBM observation
  76. GRB 190122A: Fermi-LAT detection
  77. IPN Triangulation of GRB 190118A (long)
  78. IPN Triangulation of GRB 190117A (long)
  79. Trigger 884906: Swift detection of MAXI J1631-479
  80. Swift ToO Instructions Update
  81. Swift ToO Website Down
  82. GRB 190114C: UKIRT JHK observation (CORRECTIONS)
  83. GRB 190114C: UKIRT JHK observation continuation - steady fading?
  84. GRB 190114C: REM optical/NIR detection (CORRECTION)
  85. GRB 190114C: Sardinia Radio Telescope observations
  86. GRB 190106A: Discovery Channel Telescope observations
  87. GRB 190114C: Optical detection from HCT
  88. GRB 190114A:DOAO/LOAO optical observation
  89. Konus-Wind observation of GRB 190114C
  90. The Swift-XRT WT mode spectrum of GRB190114C
  91. GRB190114C, Long follow up urged
  92. GRB190114C: GRowth-India detection of optical afterglow
  93. GRB 190114A: DOAO/LOAO optical observation
  94. GRB 190114C: REM optical/NIR detection
  95. GRB 190114C: Mondy optical observations
  96. GRB 190114C: Swift-BAT refined analysis
  97. GRB 190114B, Swift-BAT refined analysis
  98. GRB 190114C: A type 1 BdHN with TeV emission
  99. GRB 190114C: SPI-ACS/INTEGRAL extended emission detection
  100. GRB 190114C: AGILE/MCAL detection

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