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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"

36142 results found.

  1. GRB 170912B: Enhanced Swift-XRT position
  2. GRB 170912B: Swift detection of a burst
  3. GRB 170912A: Enhanced Swift-XRT position
  4. GRB 170912A: Prompt enhanced Swift-XRT position
  5. GRB 170912A: Swift detection of a burst
  6. Konus-Wind observation of GRB 170906A
  7. GRB 170911A: MAXI/GSC detection
  8. Konus-Wind observation of GRB 170906C
  9. GRB 170906A: AstroSat CZTI(Veto) detection
  10. GRB 170830B CALET Gamma-Ray Burst Monitor detection
  11. IBAS Alert nr. 7913 is not a real GRB
  12. Fermi-GBM GRB mis-classifications during current Solar activity
  13. Konus-Wind observation of GRB 170904A
  14. GRB 170906A: Swift/UVOT Detection
  15. GRB 170906B: Swift/UVOT Upper Limits
  16. GRB 170906B: Swift-XRT refined Analysis
  17. GRB 170906C: optical observations
  18. GRB 170906B: Swift-BAT refined analysis
  19. GRB 170906B: Fermi GBM detection
  20. GRB 170906A: Fermi GBM detection
  21. GRB 170906A: Swift-BAT refined analysis
  22. GRB 170906C: COATLI Observations
  23. GRB 170906A: Swift-XRT refined Analysis
  24. GRB 170906C: Swift/UVOT Upper Limits
  25. GRB 170906C: Swift-XRT refined Analysis
  26. GRB 170906C: Swift-BAT refined analysis
  27. GRB 170906C: Enhanced Swift-XRT position
  28. GRB 170906A: MASTER-OAFA (Argentina) early automatic OT detection
  29. GRB 170829A: Insight-HXMT detection
  30. GRB 170906C: Swift-XRT observations
  31. GRB 170906A: Fermi-LAT detection
  32. GRB 170906C: Swift detection of a burst
  33. GRB 170906A: REM optical/NIR observations
  34. GRB 170906A: Enhanced Swift-XRT position
  35. GRB 170906B: Enhanced Swift-XRT position
  36. GRB 170906B: Swift detection of a burst
  37. GRB 170906A: Swift detection of a burst with an optical afterglow
  38. IPN Triangulation of GRB 170904A (long/very bright)
  39. GRB 170901B: Insight-HXMT detection
  40. GRB 170904A: Insight-HXMT detection
  41. GRB 170903A: Fermi GBM observation
  42. GRB 170827A: LCO Observations
  43. GRB 170903A: Swift/UVOT Upper Limits
  44. GRB 170903A: UAFO /ISON optical upper limit
  45. GRB 170903A: MITSuME Okayama upper limits
  46. GRB 170903A: Swift-XRT refined Analysis
  47. GRB 170903A: Host galaxy redshift from OSIRIS/GTC
  48. GRB 170903A: Enhanced Swift-XRT position
  49. GRB 170903A: Swift-BAT refined analysis
  50. GRB 170903A: Nanshan optical upper limit
  51. GRB 170903A: Swift-XRT observations
  52. GRB 170903A: Swift detection of a burst
  53. Swift Trigger 770431 (GRB 170902A) is a not a GRB
  54. GRB 170902A: Enhanced Swift-XRT position
  55. GRB 170902A: Swift detection of a burst or possible Galactic transient
  56. LIGO/Virgo G298048
  57. GRB 170831A: Fermi GBM detection
  58. GRB 170830A: Fermi GBM observation
  59. Konus-Wind observation of GRB 170827B
  60. Konus-Wind observation of GRB 170826A
  61. GRB 170830A: Astrosat CZTI detection
  62. Konus-Wind observation of GRB 170826B
  63. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  64. GRB 170830A: iTelescope optical observations
  65. GRB 170830A: MAXI/GSC detection
  66. LIGO/Virgo G299232 : RATIR Optical and NIR Observations of Swift UVOT source
  67. IPN Triangulation of GRB 170826B
  68. LIGO/Virgo G298048: ALMA observations
  69. LIGO/Virgo G298048: Konus-Wind observations
  70. GRB170827A: Further GROND follow-up observations
  71. GRB 170826B: Insight-HXMT detection
  72. IPN Triangulation of GRB 170827B (short)
  73. IPN Triangulation of GRB 170826A (short)
  74. LIGO/Virgo G298936: HAWC follow-up
  75. GRB 170827A: Swift-XRT refined Analysis
  76. GROND observations of GRB170827A
  77. GRB 170827A: ePESSTO NTT afterglow candidate
  78. GRB 170823A: TAROT Calern observatory optical observations
  79. GRB 170827A, Swift-BAT refined analysis
  80. GRB 170827A: Swift/UVOT Upper Limits
  81. GRB 170827A: REM optical/NIR observations
  82. GRB 170827A: Swift detection of a burst
  83. GRB 170826B: Fermi GBM detection
  84. GRB 170826A: Fermi GBM detection
  85. GRB 170820A CALET Gamma-Ray Burst Monitor detection
  86. LIGO/Virgo G299232: Swift/BAT data search
  87. GRB 170822A: AstroSat CZTI detection
  88. LIGO/Virgo G297595: INTEGRAL pointed follow-up observations
  89. GRB 170825A: AGILE/MCAL Detection
  90. Konus-Wind observation of GRB 170822A
  91. GRB 170823A: Swift-BAT refined analysis
  92. GRB 170823A: Swift detection of a burst
  93. LIGO/Virgo G298936: Swift/BAT data search
  94. GRB 170822A: RATIR Optical and NIR Observations
  95. GRB 170822A: AbAO optical upper limit
  96. GRB 170822A: MITSuME Akeno Optical Observation
  97. GRB 170822A: Swift-BAT refined analysis
  98. GRB 170822A: Swift/UVOT Upper Limits
  99. GRB 170822A: Swift-XRT refined Analysis
  100. GRB 170822A: Enhanced Swift-XRT position

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