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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"

24597 results found.

  1. IPN Triangulation of GRB 190304A (long)
  2. GRB 190306A: Swift-XRT observations
  3. Konus-Wind observation of GRB 190305A
  4. IPN Triangulation of GRB 190305A
  5. GRB 190305A: Swift-XRT observations
  6. GRB 190305A: MAXI/GSC detection
  7. INTEGRAL observation of IceCube-190221A
  8. Search for additional neutrino events from the direction of IceCube-190221A with IceCube
  9. IceCube-190221A: Swift-XRT Follow-up Observations
  10. IceCube-190221A: Fermi-LAT Gamma-ray observations
  11. IceCube-190221A: MASTER Global Robotic Net optical observation
  12. GRB 190220B: Fermi GBM observation
  13. GRB 190220B: Kitab Observatory optical upper limit
  14. IceCube-190221A - IceCube observation of a high-energy neutrino candidate event
  15. GRB 190220B: a long GRB detected by IBAS
  16. GRB 190220A: Swift-BAT refined analysis
  17. GRB 190219A: Swift-BAT refined analysis
  18. GRB190219A: MASTER Global Robotic Net optical observation
  19. GRB 190215A: AstroSat CZTI detection
  20. GRB 190215A: Fermi GBM detection
  21. GRB 190206A: AstroSat CZTI detection
  22. GRB190211A: MITSuME Akeno optical observation
  23. GRB 190211A: Swift-BAT refined analysis
  24. GRB190211A: MASTER Global Robotic Net optical observation
  25. GRB 190211A: Swift detection of a burst
  26. Trigger 888312: Swift detection of 4U 1901+03
  27. Konus-Wind observation of GRB 190206A
  28. IPN Triangulation of GRB 190206A (short/extremely bright)
  29. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  30. Retraction of IceCube GCN/AMON NOTICE 36142391_132143
  31. GRB 190203A: Swift-BAT refined analysis
  32. GRB 190204A: Swift-BAT refined analysis
  33. GRB 190202A: SAO RAS further optical observations
  34. Konus-Wind observation of GRB 190204A
  35. GRB 190204A: SAO RAS optical observations
  36. GRB 190204A: Mondy optical upper limit
  37. Konus-Wind observation of GRB 190203A
  38. GRB 190203A: Swift-XRT refined Analysis
  39. GRB 190204A: Swift-XRT refined Analysis
  40. GRB 190204A: MAXI/GSC detection
  41. GRB 190202A: R and I band observation from HCT
  42. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  43. Swift Trigger 887541: MASTER optical observation
  44. GRB 190203A: MASTER OT detection
  45. GRB 190203A: Koshka Zeiss-1000 optical upper limit
  46. GRB 190202A: LCO-CTIO optical observations
  47. GRB 190202A: Fermi GBM observation
  48. GRB 190202A, Swift-BAT refined analysis
  49. GRB 190202A: AGILE ratemeters detection
  50. GRB 190129B: Swift-XRT candidate afterglow detection
  51. Fermi GBM Observations of IceCube-190124A
  52. GRB 190129A: Fermi GBM detection
  53. Konus-Wind observation of extremely bright GRB 190129B
  54. IPN Triangulation of GRB 190129B (long/extremely bright)
  55. INTEGRAL observation of IceCube-190124A
  56. Swift Trigger 886157: MASTER optical observation
  57. Swift Trigger 886157: Swift detection of a new transient Swift J1728.9-3613
  58. Trigger 885807: Swift detection of MAXI J1348-630
  59. Search for counterparts to IceCube-190124A with IceCube
  60. Search for counterpart to IceCube-190124A with ANTARES
  61. Fermi-LAT Gamma-ray Observations of IceCube-190124A
  62. IceCube-190124A - IceCube observation of a high-energy neutrino candidate event
  63. Konus-Wind observation of GRB 190122A
  64. Konus-Wind of observation of GRB 190117A
  65. GRB 190123A: Swift-BAT refined analysis
  66. GRB190123A: MITSuME Akeno optical upper limits
  67. Trigger 885456: Swift detection of MAXI J1631-479
  68. GRB 190123A: Fermi GBM observation
  69. GRB 190123A: MASTER Global Robotic Net optical observation
  70. GRB 190123A: Swift detection of a burst
  71. GRB 190122A: Fermi GBM observation
  72. GRB 190122A: Fermi-LAT detection
  73. IPN Triangulation of GRB 190118A (long)
  74. IPN Triangulation of GRB 190117A (long)
  75. Trigger 884906: Swift detection of MAXI J1631-479
  76. Swift ToO Instructions Update
  77. Swift ToO Website Down
  78. GRB 190114C: UKIRT JHK observation (CORRECTIONS)
  79. GRB 190114C: UKIRT JHK observation continuation - steady fading?
  80. GRB 190114C: REM optical/NIR detection (CORRECTION)
  81. GRB 190114C: Sardinia Radio Telescope observations
  82. GRB 190106A: Discovery Channel Telescope observations
  83. GRB 190114C: Optical detection from HCT
  84. GRB 190114A:DOAO/LOAO optical observation
  85. Konus-Wind observation of GRB 190114C
  86. The Swift-XRT WT mode spectrum of GRB190114C
  87. GRB190114C, Long follow up urged
  88. GRB190114C: GRowth-India detection of optical afterglow
  89. GRB 190114A: DOAO/LOAO optical observation
  90. GRB 190114C: REM optical/NIR detection
  91. GRB 190114C: Mondy optical observations
  92. GRB 190114C: Swift-BAT refined analysis
  93. GRB 190114B, Swift-BAT refined analysis
  94. GRB 190114C: A type 1 BdHN with TeV emission
  95. GRB 190114C: SPI-ACS/INTEGRAL extended emission detection
  96. GRB 190114C: AGILE/MCAL detection
  97. GRB190109B: MITSuME Akeno optical upper limits
  98. GRB 190114C: Fermi-LAT detection
  99. GRB 190114C: Fermi GBM detection
  100. GRB 190114C: Swift-XRT refined Analysis

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