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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"

37715 results found.

  1. Fermi GBM trigger 526978609/170913289 is not a GRB
  2. GRB 170912B: Swift-BAT refined analysis
  3. GRB 170912A: Swift-BAT refined analysis
  4. GRB 170912A: Swift-XRT refined Analysis
  5. GRB 170912A: Swift/UVOT Upper-Limits
  6. GRB 170912B: Swift-XRT refined Analysis
  7. GRB 170912B: Fermi GBM observations
  8. LIGO/Virgo G298936: Konus-Wind observations
  9. LIGO/Virgo G299232: Konus-Wind observations
  10. GRB 170911A: Fermi GBM observation
  11. GRB 170912B: Enhanced Swift-XRT position
  12. GRB 170912B: Swift detection of a burst
  13. GRB 170912A: Enhanced Swift-XRT position
  14. GRB 170912A: Prompt enhanced Swift-XRT position
  15. GRB 170912A: Swift detection of a burst
  16. Konus-Wind observation of GRB 170906A
  17. GRB 170911A: MAXI/GSC detection
  18. Konus-Wind observation of GRB 170906C
  19. GRB 170906A: AstroSat CZTI(Veto) detection
  20. GRB 170830B CALET Gamma-Ray Burst Monitor detection
  21. IBAS Alert nr. 7913 is not a real GRB
  22. Fermi-GBM GRB mis-classifications during current Solar activity
  23. Konus-Wind observation of GRB 170904A
  24. GRB 170906A: Swift/UVOT Detection
  25. GRB 170906B: Swift/UVOT Upper Limits
  26. GRB 170906B: Swift-XRT refined Analysis
  27. GRB 170906C: optical observations
  28. GRB 170906B: Swift-BAT refined analysis
  29. GRB 170906B: Fermi GBM detection
  30. GRB 170906A: Fermi GBM detection
  31. GRB 170906A: Swift-BAT refined analysis
  32. GRB 170906C: COATLI Observations
  33. GRB 170906A: Swift-XRT refined Analysis
  34. GRB 170906C: Swift/UVOT Upper Limits
  35. GRB 170906C: Swift-XRT refined Analysis
  36. GRB 170906C: Swift-BAT refined analysis
  37. GRB 170906C: Enhanced Swift-XRT position
  38. GRB 170906A: MASTER-OAFA (Argentina) early automatic OT detection
  39. GRB 170829A: Insight-HXMT detection
  40. GRB 170906C: Swift-XRT observations
  41. GRB 170906A: Fermi-LAT detection
  42. GRB 170906C: Swift detection of a burst
  43. GRB 170906A: REM optical/NIR observations
  44. GRB 170906A: Enhanced Swift-XRT position
  45. GRB 170906B: Enhanced Swift-XRT position
  46. GRB 170906B: Swift detection of a burst
  47. GRB 170906A: Swift detection of a burst with an optical afterglow
  48. IPN Triangulation of GRB 170904A (long/very bright)
  49. GRB 170901B: Insight-HXMT detection
  50. GRB 170904A: Insight-HXMT detection
  51. GRB 170903A: Fermi GBM observation
  52. LIGO/Virgo G298389: Fermi GBM Flux Upper Limits
  53. GRB 170827A: LCO Observations
  54. GRB 170903A: Swift/UVOT Upper Limits
  55. GRB 170903A: UAFO /ISON optical upper limit
  56. GRB 170903A: MITSuME Okayama upper limits
  57. GRB 170903A: Swift-XRT refined Analysis
  58. GRB 170903A: Host galaxy redshift from OSIRIS/GTC
  59. GRB 170903A: Enhanced Swift-XRT position
  60. GRB 170903A: Swift-BAT refined analysis
  61. GRB 170903A: Nanshan optical upper limit
  62. GRB 170903A: Swift-XRT observations
  63. GRB 170903A: Swift detection of a burst
  64. Swift Trigger 770431 (GRB 170902A) is a not a GRB
  65. GRB 170902A: Enhanced Swift-XRT position
  66. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  67. GRB 170902A: Swift detection of a burst or possible Galactic transient
  68. LIGO/Virgo G298048
  69. LIGO/Virgo G299232/PGWB170825.55: MASTER archive images of the SIWFT/UVOT and MASTER OT J033744.97+723159.0 in NGC1343 galaxy before 25
  70. GRB 170831A: Fermi GBM detection
  71. GRB 170830A: Fermi GBM observation
  72. Konus-Wind observation of GRB 170827B
  73. Konus-Wind observation of GRB 170826A
  74. GRB 170830A: Astrosat CZTI detection
  75. Konus-Wind observation of GRB 170826B
  76. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  77. GRB 170830A: iTelescope optical observations
  78. GRB 170830A: MAXI/GSC detection
  79. LIGO/Virgo G299232 : RATIR Optical and NIR Observations of Swift UVOT source
  80. IPN Triangulation of GRB 170826B
  81. LIGO/Virgo G298048: ALMA observations
  82. LIGO/Virgo G298048: Konus-Wind observations
  83. GRB170827A: Further GROND follow-up observations
  84. GRB 170826B: Insight-HXMT detection
  85. IPN Triangulation of GRB 170827B (short)
  86. IPN Triangulation of GRB 170826A (short)
  87. LIGO/Virgo G298936: HAWC follow-up
  88. GRB 170827A: Swift-XRT refined Analysis
  89. GROND observations of GRB170827A
  90. GRB 170827A: ePESSTO NTT afterglow candidate
  91. GRB 170823A: TAROT Calern observatory optical observations
  92. GRB 170827A, Swift-BAT refined analysis
  93. GRB 170827A: Swift/UVOT Upper Limits
  94. GRB 170827A: REM optical/NIR observations
  95. GRB 170827A: Swift detection of a burst
  96. GRB 170826B: Fermi GBM detection
  97. GRB 170826A: Fermi GBM detection
  98. LIGO/VIRGO G299232: Fermi GBM Observations
  99. LIGO/Virgo G299232 : Fermi-LAT search for high-energy gamma-ray counterpart
  100. GRB 170820A CALET Gamma-Ray Burst Monitor detection

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