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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"

43933 results found.

  1. GRB 170428A: Swift detection of a short burst
  2. Swift trigger 750096 - OT candidate
  3. GRB170426.95 MASTER-Net OT detection
  4. Swift Trigger 750096 is probably a noise fluctuation
  5. Swift Trigger 750044 is probably a noise fluctuation
  6. GRB 170424A: LCO Observations
  7. Konus-Wind observation of GRB 170424A
  8. GRB 170424A: Tiled Swift observations
  9. GRB 170424A: Fermi GBM detection
  10. GRB 170424A: Fermi-LAT detection
  11. GRB 170419A: LCO Observations
  12. GRB 170423A: Fermi GBM detection
  13. Swift Trigger 748858: AbAO and TSHAO optical observations
  14. Fermi GBM trigger 514436208/170421123 is not a GRB
  15. Swift Trigger 748858: TAROT La Silla observatory optical observations
  16. Swift Trigger 748858: RATIR Optical and NIR Observations
  17. GRB 170419B, Swift-BAT refined analysis
  18. GRB 170419B: Zadko observatory - Gingin optical observations
  19. GRB 170419A: Zadko observatory - Gingin optical observations
  20. Fermi GBM trigger 514379207/170420463 is not a GRB
  21. GRB 170419A: Swift-XRT refined Analysis
  22. GRB 170412A CALET Gamma-Ray Burst Monitor detection
  23. GRB 170419B: Fermi GBM observation
  24. GRB 170419A: Swift-BAT refined analysis
  25. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  26. GRB 170419B: Swift detection of a burst
  27. GRB 170419A: Enhanced Swift-XRT position
  28. Swift Trigger 748858: MASTER-OAFA early optical observations
  29. GRB 170419A: Swift detection of a burst
  30. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  31. Swift Trigger 748858: a possible GRB
  32. LIGO/Virgo G275404: DLT40 follow-up observation
  33. LIGO/Virgo G277583: DLT40 follow-up observation
  34. GRB 170409A: TAROT Reunion observatory optical observations
  35. Konus-Wind observation of GRB 170409A
  36. GRB 170402A: AstroSat CZTI detection
  37. GRB 170409A: Fermi GBM Observation
  38. GRB 170409A: Fermi-LAT detection
  39. GRB 170405A: SMARTS optical/IR afterglow observations
  40. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  41. GRB 170317A: SAO RAS optical observations
  42. GRB170405A, Swift-UVOT Detection
  43. GRB 170405A, Swift-BAT refined analysis
  44. GRB 170405A: Etelman observatory optical observations
  45. GRB 170405A: Swift-XRT refined Analysis
  46. GRB 170405A: RATIR Optical and NIR Observations
  47. Konus-Wind observation of GRB 170405A
  48. GRB 170405A: LCO FTN observations
  49. Trigger 745966: Swift detection of 4U1850-03
  50. GRB 170405A: ISON/Terskol optical observations
  51. GRB 170405A: Watcher optical detection
  52. GRB 170405A: Redshift from OSIRIS/GTC
  53. GRB 170405A: TAROT Reunion observatory optical observations
  54. GRB 170405A: NOT optical observations
  55. GRB 170405A: Fermi-LAT detection
  56. GRB 170405A: Fermi GBM observation
  57. GRB 170405A: Enhanced Swift-XRT position
  58. GRB 170405A: Swift detection of a burst with an optical counterpart
  59. LIGO/Virgo G275697: Update on significance from offline analyses
  60. LIGO/Virgo G275404: Update on significance from offline analyses
  61. LIGO/Virgo G275404: European VLBI Network (EVN) follow-up of the near-IR transient in the AGL J1914+1043 field
  62. GRB 170402A CALET Gamma-Ray Burst Monitor detection
  63. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  64. GRB 170325A: optical observations, possible OT/host detection
  65. Konus-Wind observation of GRB 170403A (short/hard)
  66. IPN Triangulation of GRB 170403A (short)
  67. GRB 170403A: Fermi GBM observation
  68. Konus-Wind observation of GRB 170330A
  69. IceCube-170321A: Konus-Wind upper limits
  70. Swift Trigger 745090 is a noise trigger near NGC 5195
  71. Fermi-LAT Gamma-ray Observations of IceCube-170321
  72. Swift triggered on SAX J1806.5-221
  73. GRB 170330A: AstroSat CZTI detection
  74. GRB 170330A: Swift-BAT refined analysis
  75. GRB 170331A: Swift-BAT refined analysis
  76. DOAO 1m telescope V, R, I observation of GRB 170317A
  77. GRB 170331A: Swift/UVOT Upper Limits
  78. IceCube-170321A: Swift-XRT observations
  79. GRB 170330A: Swift-XRT refined Analysis
  80. GRB 170331A: Swift-XRT refined Analysis
  81. GRB 170330A: Enhanced Swift-XRT position
  82. GRB 170331A: Enhanced Swift-XRT position
  83. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  84. GRB 170325A: 15 GHz upper limits from AMI
  85. GRB 170318B: 15 GHz upper limits from AMI
  86. GRB 170318A: 15 GHz upper limits from AMI
  87. GRB 170317A: 15 GHz upper limits from AMI
  88. GRB 170330A: LCO Cerro Tololo observations
  89. LIGO/Virgo G275697: LOFAR follow-up
  90. Konus-Wind observation of GRB 170329A
  91. GRB 170329A: AstroSat CZTI detection
  92. IBAS trigger 7789 is not a GRB
  93. GRB 170331A: LCO Sutherland observations
  94. GRB 170331A: Prompt enhanced Swift-XRT position
  95. Fermi trigger 512347439/GRB 170327A: MASTER-SAAO possible OT detection
  96. GRB 170331A: Swift detection of a burst
  97. GRB 170330A: Prompt enhanced Swift-XRT position
  98. GRB 170330A: Swift detection of a burst
  99. GRB 170329A: Fermi GBM detection
  100. GRB 170329A: Fermi-LAT detection

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