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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"

43920 results found.

  1. GRB 170205A: NOT afterglow observations
  2. GRB 170205A: Swift-XRT refined Analysis
  3. GRB 170205A: Enhanced Swift-XRT position
  4. GRB 170205A: RATIR Optical and NIR Observations
  5. Fermi GBM trigger 508010837/170205755 is not a GRB
  6. Fermi GBM trigger 507959893/170205165 is not a GRB
  7. GRB 170202A: SMARTS optical/IR afterglow observations
  8. GRB 170205A: LCO FTN observations
  9. Konus-Wind observation of GRB 170202A
  10. GRB 170205A: Swift detection of a burst with an optical counterpart
  11. GRB 170202B POLAR Observation
  12. GRB 170131A: POLAR Observation
  13. GRB 170202A: Zadko observatory - Gingin optical observations
  14. GRB 170202A: Etelman Observatory optical observations
  15. GRB 170203A: Swift-BAT refined analysis
  16. GRB 170202A: Swift-BAT refined analysis
  17. GRB 170202A: RATIR Optical and NIR Observations
  18. GRB 170202A: LCO FTN observations
  19. GRB 170202A: Swift-XRT refined Analysis
  20. GRB 170202A: T100 observations
  21. GRB 170202A VLT/X-shooter redshift [minor correction]
  22. GRB 170202A: Xinglong 2.16m photometry and spectroscopic redshift
  23. GRB 170202A: Swift/UVOT Detection
  24. GRB 170202A: Enhanced Swift-XRT position
  25. GRB 170202A: Redshift from OSIRIS/GTC
  26. GRB 170203A: Swift detection of a burst
  27. GRB 170202A: NOT afterglow observations
  28. GRB 170202A: Zadko observatory - Gingin optical observations
  29. GRB 170202A: LCO Sutherland observations
  30. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  31. GRB 170202A: Mini-MegaTORTORA upper limits
  32. GRB 170202A : Xinglong TNT optical observation
  33. GRB 170202A: Swift detection of a burst with an optical afterglow
  34. GRB 170131A: Swift/UVOT Upper Limits
  35. GRB 170131A: Swift-XRT observations
  36. GRB 170131A: Fermi GBM observation
  37. GRB 170131A: Swift ToO observations
  38. GRB 170131A detected in Swift/BAT ground processing
  39. LIGO/Virgo G270580: Las Cumbres Observatory Follow-up Observations
  40. GRB 170130A: POLAR Observation
  41. Konus-Wind observation of GRB 170127C (short/hard GRB with extended emission)
  42. GRB 170127B: Swift-BAT refined analysis
  43. GRB 170127A: Swift-BAT refined analysis
  44. GRB 170127C: Swift-XRT observations
  45. GRB 170127C: POLAR Observation
  46. GRB 170127A: GROND Upper limits
  47. GRB 170127C: AstroSat CZTI detection
  48. GRB 170127B: Swift-XRT refined Analysis
  49. GRB 170124A: POLAR Observation
  50. GRB 170127A: Swift-XRT refined Analysis
  51. GRB 170126A, Swift-BAT refined analysis
  52. GRB 170124A: CALET Gamma-Ray Burst Monitor detection
  53. Swift Trigger 735413 is not an astrophysical event
  54. LIGO/Virgo G268556: FLOYDS Spectrum of iPTF17cf/PS17fr Favors an AGN Classification
  55. GRB 170127B: Fermi GBM observation
  56. GRB 170127B: Enhanced Swift-XRT position
  57. GRB 170127B: NOT r-band upper limits
  58. GRB 170127A: Enhanced Swift-XRT position
  59. Konus-Wind observation of GRB 170126A
  60. GRB 170127C: Tiled Swift observations
  61. GRB 170127C (Fermi/GBM trigger 507173752): AGILE analysis
  62. GRB 170127C: Fermi-LAT detection
  63. GRB 170127C: Fermi GBM detection
  64. LIGO/Virgo G270580: HAWC follow-up observations
  65. GRB 170127B: MASTER-Kislovodsk early optical observations
  66. GRB 170127B: Swift detection of a short burst
  67. GRB 170127A: Prompt enhanced Swift-XRT position
  68. GRB 170127A: Swift detection of a burst
  69. GRB 170126A: AstroSat CZTI detection
  70. LIGO/Virgo G270580: Swift/UVOT follow-up of PS17yt
  71. GRB 170126A: Swift-XRT refined Analysis
  72. GRB 170126A: Swift/UVOT Detection of a Fading Afterglow
  73. GRB 170126A: Fermi GBM observation
  74. LIGO/Virgo G270580: Fermi GBM Observations
  75. GRB 170126A: Enhanced Swift-XRT position
  76. GRB 170126A: Swift detection of a burst with an optical counterpart
  77. GRB 170115A: 15 GHz upper limits from AMI
  78. LIGO/Virgo G270580: MAXI/GSC observations
  79. LIGO/Virgo G270580: NOT observations of PS17yt
  80. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  81. GRB 170115B: AGILE/SuperAGILE localisation
  82. LIGO/Virgo G270580: Asiago 1.82m observations of PS17ua and PS17yt
  83. LIGO/Virgo G270580: Swift-XRT follow-up of PS17yt
  84. LIGO/Virgo G270580: 10.4m GTC spectroscopic observations of PS17yt
  85. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  86. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  87. LIGO/Virgo G268556: ANTARES upper limits
  88. GRB 170121B: AbAO optical observations
  89. LIGO/Virgo G270580: UL50 observations
  90. GRB 170121B: MASTER early optical observations of the Swift possible XT
  91. LIGO/Virgo G270580: CALET Observations
  92. LIGO/Virgo G270580: Pan-STARRS coverage and bright, rising transient PS17yt
  93. GRB 170121B: AstroSat CZTI detection
  94. GRB 170121B: Swift-XRT and UVOT observations
  95. LIGO/Virgo G270580/GW170120 : Asiago observations
  96. GRB 170121B: LCO FTN observations
  97. LIGO/Virgo G268556/GW170104: MAXI/GSC observations
  98. LIGO/Virgo G270580: A third optical transient from CNEOST
  99. GRB 170121B: Fermi GBM detection
  100. GRB 170121B: Swift ToO observations

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