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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"

37708 results found.

  1. GRB 170510A: Swift-XRT observations
  2. GRB 170510A: Fermi GBM observation
  3. GRB 170510A: Tiled Swift observations
  4. GRB 170510A: Fermi-LAT detection
  5. Swift Trigger 752193 is not a GRB
  6. GRB 170423A: TAROT Reunion observatory optical observations
  7. Swift XRT observations of GRB 170424A
  8. LIGO/VIRGO G284239: Fermi GBM Upper Limits
  9. LIGO/Virgo G284239: HAWC follow-up
  10. LIGO/Virgo G284239: Fermi-LAT search for a high-energy gamma-ray counterpart
  11. GRB 170428A CALET Gamma-Ray Burst Monitor detection
  12. LIGO/Virgo G284239: Swift/BAT data search
  13. GRB 170428A: GTC spectroscopic redshift of candidate host galaxy
  14. GRB 170428A: 15 GHz upper limits from AMI
  15. Swift Trigger 748858: 15 GHz upper limits from AMI
  16. GRB 170428A: TNG optical observations
  17. Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
  18. GRB 170428A: DCT Imaging
  19. GRB 170428A: TAROT La Silla observatory optical observations
  20. GRB 170428A: RATIR Afterglow Confirmation
  21. GRB 170428A: GROND detection of the afterglow
  22. GRB 170428A: Swift/UVOT Upper Limits
  23. GRB 170428A: Xinglong 2.16-m upper limit and host galaxy candidate
  24. GRB 170428A: Swift-XRT refined Analysis
  25. GRB 170428A: Swift-BAT refined analysis
  26. Konus-Wind observation of GRB 170428A
  27. GRB 170428A: MASTER-OAFA early optical observations
  28. GRB 170428A: Swift detection of a short burst
  29. GRB 170424A: LCO Observations
  30. Konus-Wind observation of GRB 170424A
  31. GRB 170419A: Swift/UVOT Upper Limits
  32. GRB 170424A: Tiled Swift observations
  33. GRB 170424A: Fermi GBM detection
  34. GRB 170424A: Fermi-LAT detection
  35. GRB 170419A: LCO Observations
  36. GRB 170423A: Fermi GBM detection
  37. Swift Trigger 748858: AbAO and TSHAO optical observations
  38. Fermi GBM trigger 514436208/170421123 is not a GRB
  39. Swift Trigger 748858: TAROT La Silla observatory optical observations
  40. Swift Trigger 748858: RATIR Optical and NIR Observations
  41. GRB 170419B, Swift-BAT refined analysis
  42. GRB 170419B: Zadko observatory - Gingin optical observations
  43. GRB 170419A: Zadko observatory - Gingin optical observations
  44. Fermi GBM trigger 514379207/170420463 is not a GRB
  45. GRB 170419A: Swift-XRT refined Analysis
  46. GRB 170412A CALET Gamma-Ray Burst Monitor detection
  47. GRB 170419B: Fermi GBM observation
  48. GRB 170419A: Swift-BAT refined analysis
  49. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  50. GRB 170419B: Swift detection of a burst
  51. GRB 170419A: Enhanced Swift-XRT position
  52. GRB 170419A: Swift detection of a burst
  53. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  54. Swift Trigger 748858: a possible GRB
  55. GRB 170409A: TAROT Reunion observatory optical observations
  56. Konus-Wind observation of GRB 170409A
  57. GRB 170402A: AstroSat CZTI detection
  58. GRB 170409A: Fermi GBM Observation
  59. GRB 170409A: Fermi-LAT detection
  60. GRB 170405A: SMARTS optical/IR afterglow observations
  61. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  62. GRB 170317A: SAO RAS optical observations
  63. GRB170405A, Swift-UVOT Detection
  64. GRB 170405A, Swift-BAT refined analysis
  65. GRB 170405A: Etelman observatory optical observations
  66. GRB 170405A: Swift-XRT refined Analysis
  67. GRB 170405A: RATIR Optical and NIR Observations
  68. Konus-Wind observation of GRB 170405A
  69. GRB 170405A: LCO FTN observations
  70. GRB 170405A: ISON/Terskol optical observations
  71. GRB 170405A: Watcher optical detection
  72. GRB 170405A: Redshift from OSIRIS/GTC
  73. GRB 170405A: TAROT Reunion observatory optical observations
  74. GRB 170405A: NOT optical observations
  75. GRB 170405A: Fermi-LAT detection
  76. GRB 170405A: Fermi GBM observation
  77. GRB 170405A: Enhanced Swift-XRT position
  78. GRB 170405A: Swift detection of a burst with an optical counterpart
  79. GRB 170402A CALET Gamma-Ray Burst Monitor detection
  80. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  81. GRB 170325A: optical observations, possible OT/host detection
  82. Konus-Wind observation of GRB 170403A (short/hard)
  83. IPN Triangulation of GRB 170403A (short)
  84. GRB 170403A: Fermi GBM observation
  85. Konus-Wind observation of GRB 170330A
  86. IceCube-170321A: Konus-Wind upper limits
  87. Fermi-LAT Gamma-ray Observations of IceCube-170321
  88. GRB 170330A: AstroSat CZTI detection
  89. GRB 170330A: Swift-BAT refined analysis
  90. GRB 170331A: Swift-BAT refined analysis
  91. DOAO 1m telescope V, R, I observation of GRB 170317A
  92. GRB 170331A: Swift/UVOT Upper Limits
  93. GRB 170330A: Swift-XRT refined Analysis
  94. GRB 170331A: Swift-XRT refined Analysis
  95. GRB 170330A: Enhanced Swift-XRT position
  96. GRB 170331A: Enhanced Swift-XRT position
  97. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  98. GRB 170325A: 15 GHz upper limits from AMI
  99. GRB 170318B: 15 GHz upper limits from AMI
  100. GRB 170318A: 15 GHz upper limits from AMI

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