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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"

43892 results found.

  1. GRB 161108A: NOT redshift
  2. GRB 161108A: RATIR Afterglow Confirmation
  3. GRB 161108A: Swift-XRT refined Analysis
  4. GRB 161108A: Enhanced Swift-XRT position
  5. GRB 161108A: NOT candidate afterglow
  6. GRB 161108A: Swift detection of a burst
  7. Fermi LAT Gamma-ray Observations of IceCube-161103
  8. GRB 161022A: 15 GHz upper limits from AMI
  9. GRB 161017A: 15 GHz upper limits from AMI
  10. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  11. GRB 161106A: Fermi GBM detection
  12. IceCube-161103: Konus-Wind upper limits
  13. GRB 161105A: Swift-XRT refined Analysis
  14. GRB 161104A: Gemini South optical observations
  15. GRB 161105A: Swift-BAT refined analysis
  16. GRB 161105A: Enhanced Swift-XRT position
  17. Search for counterpart to IceCube-161103A with ANTARES
  18. GRB 161105A: MASTER-IAC early optical observations
  19. GRB 161104A: GROND observations
  20. GRB 161105A: Swift detection of a burst
  21. GRB 161104A, Swift-BAT refined analysis
  22. GRB 161104A: Swift-XRT refined Analysis
  23. Fermi GBM Observations of IceCube-161103
  24. GRB 160928A: The first GRB detected by POLAR
  25. IceCube-161103: Swift-XRT observations
  26. GRB 161104A: Enhanced Swift-XRT position
  27. GRB 161104A: Swift detection of a short burst
  28. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  29. IceCube-161103: MASTER follow-up observations
  30. HAWC follow up of IceCube-161103
  31. IceCube-161103: IceCube observation of a very-high-energy neutrino
  32. GRB 161020A: Fermi GBM observation
  33. Fermi GBM trigger 499467682/161029876 is not a GRB
  34. GRB 161015A: 15 GHz upper limits from AMI
  35. GRB 161014A: 15 GHz upper limits from AMI
  36. GRB161023A: AstroSat CZTI detection
  37. GRB 161023A: GROND Observations
  38. GRB 161023A: Swift-XRT afterglow detection
  39. Konus-Wind observation of GRB 161023A
  40. GRB 161023A: TAROT La Silla observatory optical observations
  41. GRB 161023A: Zadko observatory - Gingin optical observations
  42. GRB 161023A: Watcher optical observations
  43. GRB 161023A: LCOGT-FTS optical observations
  44. GRB 161023A: Swift ToO observations
  45. Radio upper limit on the GRB 161011A with the GMRT
  46. GRB 161023A VLT/X-shooter redshift
  47. GRB 161023A: A long GRB detected by INTEGRAL
  48. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  49. Swift Trigger 718919 is not an astrophysical event.
  50. GRB 161022A: Swift-BAT refined analysis
  51. Swift Trigger 718766 is not an astrophysical event.
  52. GRB 161022A: RATIR Optical and NIR Observations
  53. GRB 161022A: Fermi GBM observation
  54. GRB 161022A: NOT optical observations
  55. GRB 161022A: Enhanced Swift-XRT position
  56. Konus-Wind observation of GRB 161020B
  57. GRB 161022A: Swift-XRT refined Analysis
  58. IPN Triangulation of GRB 161020B
  59. GRB 161022A: LT observations
  60. GRB 161022A: TAROT Calern observatory optical observations
  61. GRB 161022A: Prompt enhanced Swift-XRT position
  62. GRB 161022A: Swift detection of a burst
  63. GRB 161020A: A long GRB detected by INTEGRAL
  64. GRB 161015A: further Swift-XRT follow-up observations
  65. GRB 161011A: 15 GHz upper limits from AMI
  66. GRB 161007A: 15 GHz upper limits from AMI
  67. Konus-Wind observation of GRB 161017A
  68. GRB161017A: NOEMA detection of the millimetre afterglow
  69. GRB 161017A: LT optical observations
  70. GRB161017A optical R band observations with SARA-RM
  71. GRB 161017A: TNG spectroscopy and redshift confirmation
  72. GRB 161017A: GTC additional spectroscopy and refined redshift
  73. GRB 161017A: Swift-BAT refined analysis
  74. GRB 161017A: Swift/UVOT Detection
  75. GRB 161017A: Swift-XRT refined Analysis
  76. GRB161017A: optical observations with 1-m LCOGT McDonald
  77. GRB 161017A: TNG optical observations
  78. GRB 161017A: Redshift from GTC
  79. GRB 161017A: Fermi GBM observation
  80. GRB 161017A: Enhanced Swift-XRT position
  81. GRB 161014A: Continued RATIR Optical and NIR Observations
  82. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  83. GRB161017.74 MASTER-Net OT detection
  84. Konus-Wind observation of GRB 161015A
  85. GRB 161014A: VLT/X-shooter redshift confirmation
  86. GRB161015A: AstroSat CZTI detection
  87. Konus-Wind observation of GRB 161014A
  88. GRB 161014A: refined analysis of TSHAO optical observations
  89. GRB 161015A: Swift-XRT observations
  90. GRB 161015A: Fermi GBM detection
  91. GRB 161015A: Tiled Swift observations
  92. GRB 161015A: Fermi-LAT detection
  93. GRB161004A: Further analysis of the burst nature
  94. GRB 161014A: RATIR Optical and NIR Observations
  95. GRB 161014A: Fermi GBM observation
  96. GRB 161014A: Swift-XRT refined Analysis
  97. GRB 161014A: Swift-BAT refined analysis
  98. GRB 161014A: TNG optical observations
  99. GRB 161014A: AROMA-N Optical Observation
  100. GRB 161014A: Swift/UVOT Detection

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