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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"

36151 results found.

  1. GRB 170424A: Fermi-LAT detection
  2. GRB 170419A: LCO Observations
  3. GRB 170423A: Fermi GBM detection
  4. Swift Trigger 748858: AbAO and TSHAO optical observations
  5. Fermi GBM trigger 514436208/170421123 is not a GRB
  6. Swift Trigger 748858: TAROT La Silla observatory optical observations
  7. Swift Trigger 748858: RATIR Optical and NIR Observations
  8. GRB 170419B, Swift-BAT refined analysis
  9. GRB 170419B: Zadko observatory - Gingin optical observations
  10. GRB 170419A: Zadko observatory - Gingin optical observations
  11. Fermi GBM trigger 514379207/170420463 is not a GRB
  12. GRB 170419A: Swift-XRT refined Analysis
  13. GRB 170412A CALET Gamma-Ray Burst Monitor detection
  14. GRB 170419B: Fermi GBM observation
  15. GRB 170419A: Swift-BAT refined analysis
  16. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  17. GRB 170419B: Swift detection of a burst
  18. GRB 170419A: Enhanced Swift-XRT position
  19. GRB 170419A: Swift detection of a burst
  20. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  21. Swift Trigger 748858: a possible GRB
  22. GRB 170409A: TAROT Reunion observatory optical observations
  23. Konus-Wind observation of GRB 170409A
  24. GRB 170402A: AstroSat CZTI detection
  25. GRB 170409A: Fermi GBM Observation
  26. GRB 170409A: Fermi-LAT detection
  27. GRB 170405A: SMARTS optical/IR afterglow observations
  28. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  29. GRB 170317A: SAO RAS optical observations
  30. GRB170405A, Swift-UVOT Detection
  31. GRB 170405A, Swift-BAT refined analysis
  32. GRB 170405A: Etelman observatory optical observations
  33. GRB 170405A: Swift-XRT refined Analysis
  34. GRB 170405A: RATIR Optical and NIR Observations
  35. Konus-Wind observation of GRB 170405A
  36. GRB 170405A: LCO FTN observations
  37. GRB 170405A: ISON/Terskol optical observations
  38. GRB 170405A: Watcher optical detection
  39. GRB 170405A: Redshift from OSIRIS/GTC
  40. GRB 170405A: TAROT Reunion observatory optical observations
  41. GRB 170405A: NOT optical observations
  42. GRB 170405A: Fermi-LAT detection
  43. GRB 170405A: Fermi GBM observation
  44. GRB 170405A: Enhanced Swift-XRT position
  45. GRB 170405A: Swift detection of a burst with an optical counterpart
  46. GRB 170402A CALET Gamma-Ray Burst Monitor detection
  47. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  48. GRB 170325A: optical observations, possible OT/host detection
  49. Konus-Wind observation of GRB 170403A (short/hard)
  50. IPN Triangulation of GRB 170403A (short)
  51. GRB 170403A: Fermi GBM observation
  52. Konus-Wind observation of GRB 170330A
  53. IceCube-170321A: Konus-Wind upper limits
  54. GRB 170330A: AstroSat CZTI detection
  55. GRB 170330A: Swift-BAT refined analysis
  56. GRB 170331A: Swift-BAT refined analysis
  57. DOAO 1m telescope V, R, I observation of GRB 170317A
  58. GRB 170331A: Swift/UVOT Upper Limits
  59. GRB 170330A: Swift-XRT refined Analysis
  60. GRB 170331A: Swift-XRT refined Analysis
  61. GRB 170330A: Enhanced Swift-XRT position
  62. GRB 170331A: Enhanced Swift-XRT position
  63. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  64. GRB 170325A: 15 GHz upper limits from AMI
  65. GRB 170318B: 15 GHz upper limits from AMI
  66. GRB 170318A: 15 GHz upper limits from AMI
  67. GRB 170317A: 15 GHz upper limits from AMI
  68. GRB 170330A: LCO Cerro Tololo observations
  69. Konus-Wind observation of GRB 170329A
  70. GRB 170329A: AstroSat CZTI detection
  71. IBAS trigger 7789 is not a GRB
  72. GRB 170331A: LCO Sutherland observations
  73. GRB 170331A: Prompt enhanced Swift-XRT position
  74. Fermi trigger 512347439/GRB 170327A: MASTER-SAAO possible OT detection
  75. GRB 170331A: Swift detection of a burst
  76. GRB 170330A: Prompt enhanced Swift-XRT position
  77. GRB 170330A: Swift detection of a burst
  78. GRB 170329A: Fermi GBM detection
  79. GRB 170329A: Fermi-LAT detection
  80. GRB 170325B: POLAR Observation
  81. GRB 170325A: Fermi GBM observation
  82. LIGO/Virgo G277583: Konus-Wind observations
  83. GRB 170325A, Swift-BAT detection of a short GRB
  84. Konus-Wind observation of GRB 170320A
  85. GRB 170320A: POLAR Observation
  86. LIGO/Virgo G277583: INTEGRAL search for an X-ray and gamma-ray counterpart
  87. Fermi GBM trigger 511851891/170322212 is not a GRB
  88. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  89. IPN Triangulation of GRB 170320A (long/intense)
  90. GRB 170318A: KAIT Optical Upper Limit
  91. GRB 170317A: Mondy optical observations
  92. GRB 170318B: Swift-BAT refined analysis
  93. GRB 170317A: POLAR observation
  94. GRB 170318B: RATIR Optical and NIR Observations
  95. GRB 170317A: RATIR Optical and NIR Observations
  96. GRB 170318B: Swift/UVOT Upper Limits
  97. GRB 170318B: Swift-XRT refined Analysis
  98. GRB 170318A: Swift-XRT refined Analysis
  99. GRB 170318A: RATIR Optical and NIR Observations
  100. GRB 170318A: Swift/UVOT Upper Limits

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