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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"

37712 results found.

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

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