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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"

36153 results found.

  1. IPN Triangulation of GRB 170529A (long)
  2. IPN Triangulation of GRB 170527A
  3. GRB 170511A: AstroSat CZTI detection
  4. GRB 170519A: ISON/Multa optical observations
  5. GRB 170511A: Fermi GBM observation
  6. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  7. LIGO/Virgo G268556/GW170104: Konus-Wind observations
  8. GRB 170527A: Fermi GBM detection
  9. GRB 170526A, Swift-BAT refined analysis
  10. GRB 170526A: Swift/UVOT Upper Limits
  11. GRB 170526A: Swift-XRT refined Analysis
  12. GRB 170524A: RATIR Optical and NIR Observations
  13. GRB 170526A: Enhanced Swift-XRT position
  14. GRB 170524B: Swift-XRT observations
  15. GRB 170526A: Swift detection of a burst
  16. Konus-Wind observation of GRB 170524B
  17. GRB 170524B: MASTER-OAFA observations
  18. GRB 170511A CALET Gamma-Ray Burst Monitor detection
  19. GRB 170524A: TSHAO and CrAO optical observations
  20. GRB 170524B: Swift ToO observations
  21. GRB 170524A: Swift-BAT refined analysis
  22. GRB 170524B: Swift detection of a burst
  23. GRB 170524A: Swift/UVOT Upper Limits
  24. GRB 170524A: D50 optical observation and limit
  25. GRB 170524A: Swift-XRT refined Analysis
  26. IPN Triangulation of GRB 170522A
  27. GRB 170511A: MAXI/GSC detection
  28. GRB 170524A: Enhanced Swift-XRT position
  29. GRB 170524A: Swift detection of a burst (or possible new SGR)
  30. GRB 170522A: LCO McDonald observations
  31. GRB 170522A: Swift-XRT observations
  32. GRB 170522A: Global MASTER-Net job
  33. Konus-Wind observation of GRB 170522B
  34. IPN Triangulation of GRB 170522B (long/intense)
  35. Konus-Wind observation of GRB 170522A
  36. GRB 170522A: Tiled Swift observations
  37. GRB 170522A: Fermi-LAT detection
  38. GRB 170522A: Fermi GBM detection
  39. GRB 170514A CALET Gamma-Ray Burst Monitor detection
  40. GRB 170519A: MITSuME Akeno Optical Observation
  41. GRB 170519A: Watcher optical observations
  42. GRB 170519A: Continued RATIR Optical and NIR Observations
  43. GRB 170519A: MITSuME Okayama Optical Observation
  44. GRB 170519A: NOT optical observations
  45. GRB 170519A: Redshift from GTC/OSIRIS
  46. GRB170519A, Swift-UVOT Detection
  47. GRB 170519A: BOOTES-5/JGT early optical detection
  48. GRB 170519A: KAIT Optical Observations
  49. GRB 170519A: Swift-XRT refined Analysis
  50. GRB 170519A: iTelescope T11 optical observations
  51. GRB 170519A: Swift-BAT refined analysis
  52. GRB 170519A: Weihai optical observations
  53. GRB 170510A: LCO Siding Springs early observations
  54. GRB 170519A: RATIR Optical and NIR Observations
  55. GRB 170519A: optical observations
  56. GRB 170519A: Enhanced Swift-XRT position
  57. GRB 170519A: Swift detection of a burst with an optical counterpart
  58. GRB 170510A CALET Gamma-Ray Burst Monitor detection
  59. GRB 170510A: Swift-XRT afterglow detection
  60. GRB 170516A: Swift-BAT refined analysis
  61. GRB 170516A: Swift-XRT refined Analysis
  62. GRB 170516A: Swift/UVOT Upper Limits
  63. GRB 170516A: Enhanced Swift-XRT position
  64. GRB 170516A: Swift detection of a burst
  65. GRB 170514A: Fermi GBM detection
  66. GRB 170510A: AstroSat CZTI(Veto) detection
  67. Fermi GBM trigger 516459580/170514541 is not a GRB
  68. GRB 170510A: Global MASTER Net possible OT observations
  69. Konus-Wind observation of GRB 170510A
  70. LIGO/Virgo G284239: Konus-Wind observations
  71. GRB 170510A: LCO possible counterpart
  72. GRB 170510A: Swift-XRT observations
  73. GRB 170510A: Fermi GBM observation
  74. GRB 170510A: Tiled Swift observations
  75. GRB 170510A: Fermi-LAT detection
  76. Swift Trigger 752193 is not a GRB
  77. GRB 170423A: TAROT Reunion observatory optical observations
  78. Swift XRT observations of GRB 170424A
  79. LIGO/Virgo G284239: HAWC follow-up
  80. GRB 170428A CALET Gamma-Ray Burst Monitor detection
  81. LIGO/Virgo G284239: Swift/BAT data search
  82. GRB 170428A: GTC spectroscopic redshift of candidate host galaxy
  83. GRB 170428A: 15 GHz upper limits from AMI
  84. Swift Trigger 748858: 15 GHz upper limits from AMI
  85. GRB 170428A: TNG optical observations
  86. Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
  87. GRB 170428A: DCT Imaging
  88. GRB 170428A: TAROT La Silla observatory optical observations
  89. GRB 170428A: RATIR Afterglow Confirmation
  90. GRB 170428A: GROND detection of the afterglow
  91. GRB 170428A: Swift/UVOT Upper Limits
  92. GRB 170428A: Xinglong 2.16-m upper limit and host galaxy candidate
  93. GRB 170428A: Swift-XRT refined Analysis
  94. GRB 170428A: Swift-BAT refined analysis
  95. Konus-Wind observation of GRB 170428A
  96. GRB 170428A: MASTER-OAFA early optical observations
  97. GRB 170428A: Swift detection of a short burst
  98. GRB 170424A: LCO Observations
  99. Konus-Wind observation of GRB 170424A
  100. GRB 170419A: Swift/UVOT Upper Limits

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