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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"

43924 results found.

  1. GRB 170206A: Fermi GBM observation
  2. GRB 170205A: Swift/UVOT Detection of a Fading Afterglow
  3. Konus-Wind observation of GRB 170205A
  4. GRB 170205A: Swift-BAT refined analysis
  5. GRB 170205A: NOT afterglow observations
  6. GRB 170205A: Swift-XRT refined Analysis
  7. GRB 170205A: Enhanced Swift-XRT position
  8. GRB 170205A: RATIR Optical and NIR Observations
  9. Fermi GBM trigger 508010837/170205755 is not a GRB
  10. Fermi GBM trigger 507959893/170205165 is not a GRB
  11. GRB 170202A: SMARTS optical/IR afterglow observations
  12. GRB 170205A: LCO FTN observations
  13. Konus-Wind observation of GRB 170202A
  14. GRB 170205A: Swift detection of a burst with an optical counterpart
  15. GRB 170202B POLAR Observation
  16. GRB 170131A: POLAR Observation
  17. GRB 170202A: Zadko observatory - Gingin optical observations
  18. GRB 170202A: Etelman Observatory optical observations
  19. GRB 170203A: Swift-BAT refined analysis
  20. GRB 170202A: Swift-BAT refined analysis
  21. GRB 170202A: RATIR Optical and NIR Observations
  22. GRB 170202A: LCO FTN observations
  23. GRB 170202A: Swift-XRT refined Analysis
  24. GRB 170202A: T100 observations
  25. GRB 170202A VLT/X-shooter redshift [minor correction]
  26. GRB 170202A: Xinglong 2.16m photometry and spectroscopic redshift
  27. GRB 170202A: Swift/UVOT Detection
  28. GRB 170202A: Enhanced Swift-XRT position
  29. GRB 170202A: Redshift from OSIRIS/GTC
  30. GRB 170203A: Swift detection of a burst
  31. GRB 170202A: NOT afterglow observations
  32. GRB 170202A: Zadko observatory - Gingin optical observations
  33. GRB 170202A: LCO Sutherland observations
  34. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  35. GRB 170202A: Mini-MegaTORTORA upper limits
  36. GRB 170202A : Xinglong TNT optical observation
  37. GRB 170202A: Swift detection of a burst with an optical afterglow
  38. GRB 170131A: Swift/UVOT Upper Limits
  39. GRB 170131A: Swift-XRT observations
  40. GRB 170131A: Fermi GBM observation
  41. GRB 170131A: Swift ToO observations
  42. GRB 170131A detected in Swift/BAT ground processing
  43. LIGO/Virgo G270580: Las Cumbres Observatory Follow-up Observations
  44. GRB 170130A: POLAR Observation
  45. Konus-Wind observation of GRB 170127C (short/hard GRB with extended emission)
  46. GRB 170127B: Swift-BAT refined analysis
  47. GRB 170127A: Swift-BAT refined analysis
  48. GRB 170127C: Swift-XRT observations
  49. GRB 170127C: POLAR Observation
  50. GRB 170127A: GROND Upper limits
  51. GRB 170127C: AstroSat CZTI detection
  52. GRB 170127B: Swift-XRT refined Analysis
  53. GRB 170124A: POLAR Observation
  54. GRB 170127A: Swift-XRT refined Analysis
  55. GRB 170126A, Swift-BAT refined analysis
  56. GRB 170124A: CALET Gamma-Ray Burst Monitor detection
  57. Swift Trigger 735413 is not an astrophysical event
  58. LIGO/Virgo G268556: FLOYDS Spectrum of iPTF17cf/PS17fr Favors an AGN Classification
  59. GRB 170127B: Fermi GBM observation
  60. GRB 170127B: Enhanced Swift-XRT position
  61. GRB 170127B: NOT r-band upper limits
  62. GRB 170127A: Enhanced Swift-XRT position
  63. Konus-Wind observation of GRB 170126A
  64. GRB 170127C: Tiled Swift observations
  65. GRB 170127C (Fermi/GBM trigger 507173752): AGILE analysis
  66. GRB 170127C: Fermi-LAT detection
  67. GRB 170127C: Fermi GBM detection
  68. LIGO/Virgo G270580: HAWC follow-up observations
  69. GRB 170127B: MASTER-Kislovodsk early optical observations
  70. GRB 170127B: Swift detection of a short burst
  71. GRB 170127A: Prompt enhanced Swift-XRT position
  72. GRB 170127A: Swift detection of a burst
  73. GRB 170126A: AstroSat CZTI detection
  74. LIGO/Virgo G270580: Swift/UVOT follow-up of PS17yt
  75. GRB 170126A: Swift-XRT refined Analysis
  76. GRB 170126A: Swift/UVOT Detection of a Fading Afterglow
  77. GRB 170126A: Fermi GBM observation
  78. LIGO/Virgo G270580: Fermi GBM Observations
  79. GRB 170126A: Enhanced Swift-XRT position
  80. GRB 170126A: Swift detection of a burst with an optical counterpart
  81. GRB 170115A: 15 GHz upper limits from AMI
  82. LIGO/Virgo G270580: MAXI/GSC observations
  83. LIGO/Virgo G270580: NOT observations of PS17yt
  84. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  85. GRB 170115B: AGILE/SuperAGILE localisation
  86. LIGO/Virgo G270580: Asiago 1.82m observations of PS17ua and PS17yt
  87. LIGO/Virgo G270580: Swift-XRT follow-up of PS17yt
  88. LIGO/Virgo G270580: 10.4m GTC spectroscopic observations of PS17yt
  89. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  90. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  91. LIGO/Virgo G268556: ANTARES upper limits
  92. GRB 170121B: AbAO optical observations
  93. LIGO/Virgo G270580: UL50 observations
  94. GRB 170121B: MASTER early optical observations of the Swift possible XT
  95. LIGO/Virgo G270580: CALET Observations
  96. LIGO/Virgo G270580: Pan-STARRS coverage and bright, rising transient PS17yt
  97. GRB 170121B: AstroSat CZTI detection
  98. GRB 170121B: Swift-XRT and UVOT observations
  99. LIGO/Virgo G270580/GW170120 : Asiago observations
  100. GRB 170121B: LCO FTN observations

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