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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"

36147 results found.

  1. Fermi GBM trigger 514436208/170421123 is not a GRB
  2. Swift Trigger 748858: TAROT La Silla observatory optical observations
  3. Swift Trigger 748858: RATIR Optical and NIR Observations
  4. GRB 170419B, Swift-BAT refined analysis
  5. GRB 170419B: Zadko observatory - Gingin optical observations
  6. GRB 170419A: Zadko observatory - Gingin optical observations
  7. Fermi GBM trigger 514379207/170420463 is not a GRB
  8. GRB 170419A: Swift-XRT refined Analysis
  9. GRB 170412A CALET Gamma-Ray Burst Monitor detection
  10. GRB 170419B: Fermi GBM observation
  11. GRB 170419A: Swift-BAT refined analysis
  12. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  13. GRB 170419B: Swift detection of a burst
  14. GRB 170419A: Enhanced Swift-XRT position
  15. GRB 170419A: Swift detection of a burst
  16. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  17. Swift Trigger 748858: a possible GRB
  18. GRB 170409A: TAROT Reunion observatory optical observations
  19. Konus-Wind observation of GRB 170409A
  20. GRB 170402A: AstroSat CZTI detection
  21. GRB 170409A: Fermi GBM Observation
  22. GRB 170409A: Fermi-LAT detection
  23. GRB 170405A: SMARTS optical/IR afterglow observations
  24. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  25. GRB 170317A: SAO RAS optical observations
  26. GRB170405A, Swift-UVOT Detection
  27. GRB 170405A, Swift-BAT refined analysis
  28. GRB 170405A: Etelman observatory optical observations
  29. GRB 170405A: Swift-XRT refined Analysis
  30. GRB 170405A: RATIR Optical and NIR Observations
  31. Konus-Wind observation of GRB 170405A
  32. GRB 170405A: LCO FTN observations
  33. GRB 170405A: ISON/Terskol optical observations
  34. GRB 170405A: Watcher optical detection
  35. GRB 170405A: Redshift from OSIRIS/GTC
  36. GRB 170405A: TAROT Reunion observatory optical observations
  37. GRB 170405A: NOT optical observations
  38. GRB 170405A: Fermi-LAT detection
  39. GRB 170405A: Fermi GBM observation
  40. GRB 170405A: Enhanced Swift-XRT position
  41. GRB 170405A: Swift detection of a burst with an optical counterpart
  42. GRB 170402A CALET Gamma-Ray Burst Monitor detection
  43. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  44. GRB 170325A: optical observations, possible OT/host detection
  45. Konus-Wind observation of GRB 170403A (short/hard)
  46. IPN Triangulation of GRB 170403A (short)
  47. GRB 170403A: Fermi GBM observation
  48. Konus-Wind observation of GRB 170330A
  49. IceCube-170321A: Konus-Wind upper limits
  50. GRB 170330A: AstroSat CZTI detection
  51. GRB 170330A: Swift-BAT refined analysis
  52. GRB 170331A: Swift-BAT refined analysis
  53. DOAO 1m telescope V, R, I observation of GRB 170317A
  54. GRB 170331A: Swift/UVOT Upper Limits
  55. GRB 170330A: Swift-XRT refined Analysis
  56. GRB 170331A: Swift-XRT refined Analysis
  57. GRB 170330A: Enhanced Swift-XRT position
  58. GRB 170331A: Enhanced Swift-XRT position
  59. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  60. GRB 170325A: 15 GHz upper limits from AMI
  61. GRB 170318B: 15 GHz upper limits from AMI
  62. GRB 170318A: 15 GHz upper limits from AMI
  63. GRB 170317A: 15 GHz upper limits from AMI
  64. GRB 170330A: LCO Cerro Tololo observations
  65. Konus-Wind observation of GRB 170329A
  66. GRB 170329A: AstroSat CZTI detection
  67. IBAS trigger 7789 is not a GRB
  68. GRB 170331A: LCO Sutherland observations
  69. GRB 170331A: Prompt enhanced Swift-XRT position
  70. Fermi trigger 512347439/GRB 170327A: MASTER-SAAO possible OT detection
  71. GRB 170331A: Swift detection of a burst
  72. GRB 170330A: Prompt enhanced Swift-XRT position
  73. GRB 170330A: Swift detection of a burst
  74. GRB 170329A: Fermi GBM detection
  75. GRB 170329A: Fermi-LAT detection
  76. GRB 170325B: POLAR Observation
  77. GRB 170325A: Fermi GBM observation
  78. LIGO/Virgo G277583: Konus-Wind observations
  79. GRB 170325A, Swift-BAT detection of a short GRB
  80. Konus-Wind observation of GRB 170320A
  81. GRB 170320A: POLAR Observation
  82. LIGO/Virgo G277583: INTEGRAL search for an X-ray and gamma-ray counterpart
  83. Fermi GBM trigger 511851891/170322212 is not a GRB
  84. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  85. IPN Triangulation of GRB 170320A (long/intense)
  86. GRB 170318A: KAIT Optical Upper Limit
  87. GRB 170317A: Mondy optical observations
  88. GRB 170318B: Swift-BAT refined analysis
  89. GRB 170317A: POLAR observation
  90. GRB 170318B: RATIR Optical and NIR Observations
  91. GRB 170317A: RATIR Optical and NIR Observations
  92. GRB 170318B: Swift/UVOT Upper Limits
  93. GRB 170318B: Swift-XRT refined Analysis
  94. GRB 170318A: Swift-XRT refined Analysis
  95. GRB 170318A: RATIR Optical and NIR Observations
  96. GRB 170318A: Swift/UVOT Upper Limits
  97. GRB 170318B: Fermi GBM observation
  98. GRB 170318A: Swift-BAT refined analysis
  99. GRB 170317A: RATIR Optical and NIR Observations
  100. GRB 170318B: Enhanced Swift-XRT position

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