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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"

28303 results found.

  1. GRB 161117B: Swift-BAT refined analysis
  2. GRB 161117A: Swift-BAT refined analysis
  3. Swift Trigger 722681 is probably not a GRB
  4. GRB 161117B: Enhanced Swift-XRT position
  5. GRB 161117A: Swift-XRT refined Analysis
  6. GRB 161117A: Enhanced Swift-XRT position
  7. GRB 161117B: LCO optical observations
  8. GRB 161117B: Swift detection of a burst
  9. GRB161117A: REM optical and NIR afterglow detection
  10. GRB 161117A: Swift detection of a burst with an optical counterpart
  11. GRB 161113A: Swift-BAT refined analysis
  12. GRB 161113A: Swift/UVOT Upper Limits
  13. GRB 161113A: Swift-XRT refined Analysis
  14. GRB 161113A: Kuban State University optical upper limit
  15. GRB 161113A: Enhanced Swift-XRT position
  16. GRB 161113A: RATIR Optical and NIR Observations
  17. GRB 161113A: Swift detection of a burst
  18. GRB 161108A: continued TSHAO optical observations
  19. GRB 161109A: Swift-XRT observations
  20. GRB 161108A: MITSuME Okayama upper limits
  21. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  22. GRB 161108A: TSHAO optical observations
  23. GRB 161108A: Swift/UVOT Upper Limits
  24. GRB 161105A: Swift/UVOT Upper Limits
  25. GRB 161109A: Fermi GBM observation
  26. GRB 161109A: Fermi-LAT detection
  27. GRB 161108A: TAROT Calern observatory optical observations
  28. GRB 161105A: TAROT La Silla observatory optical observations
  29. GRB 161108A, Swift-BAT refined analysis
  30. GRB 161108A: RATIR Afterglow Confirmation
  31. GRB 161108A: Swift-XRT refined Analysis
  32. GRB 161108A: Enhanced Swift-XRT position
  33. GRB 161108A: NOT candidate afterglow
  34. GRB 161108A: Swift detection of a burst
  35. Fermi LAT Gamma-ray Observations of IceCube-161103
  36. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  37. GRB 161106A: Fermi GBM detection
  38. IceCube-161103: Konus-Wind upper limits
  39. GRB 161105A: Swift-XRT refined Analysis
  40. GRB 161104A: Gemini South optical observations
  41. GRB 161105A: Swift-BAT refined analysis
  42. GRB 161105A: Enhanced Swift-XRT position
  43. Search for counterpart to IceCube-161103A with ANTARES
  44. GRB 161104A: GROND observations
  45. GRB 161105A: Swift detection of a burst
  46. GRB 161104A: Swift/UVOT Upper Limits
  47. GRB 161104A, Swift-BAT refined analysis
  48. GRB 161104A: Swift-XRT refined Analysis
  49. Fermi GBM Observations of IceCube-161103
  50. IceCube-161103: Swift-XRT observations
  51. GRB 161104A: Enhanced Swift-XRT position
  52. GRB 161104A: Swift detection of a short burst
  53. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  54. HAWC follow up of IceCube-161103
  55. GRB 161020A: Fermi GBM observation
  56. GRB 161023A: GROND Observations
  57. GRB 161023A: Swift-XRT afterglow detection
  58. GRB 161023A: TAROT La Silla observatory optical observations
  59. GRB 161023A: Zadko observatory - Gingin optical observations
  60. GRB 161023A: Watcher optical observations
  61. GRB 161023A: LCOGT-FTS optical observations
  62. GRB 161023A: A long GRB detected by INTEGRAL
  63. Swift Trigger 718919 is not an astrophysical event.
  64. GRB 161022A: Swift-BAT refined analysis
  65. GRB 161022A: RATIR Optical and NIR Observations
  66. GRB 161022A: Swift/UVOT Upper Limits
  67. GRB 161022A: Fermi GBM observation
  68. GRB 161022A: NOT optical observations
  69. GRB 161022A: Enhanced Swift-XRT position
  70. GRB 161022A: Swift-XRT refined Analysis
  71. IPN Triangulation of GRB 161020B
  72. GRB 161022A: TAROT Calern observatory optical observations
  73. GRB 161022A: Swift detection of a burst
  74. GRB 161020A: A long GRB detected by INTEGRAL
  75. GRB 161015A: further Swift-XRT follow-up observations
  76. Konus-Wind observation of GRB 161017A
  77. GRB161017A optical R band observations with SARA-RM
  78. GRB 161017A: Swift-BAT refined analysis
  79. GRB 161017A: Swift/UVOT Detection
  80. GRB 161017A: Swift-XRT refined Analysis
  81. GRB161017A: optical observations with 1-m LCOGT McDonald
  82. GRB 161017A: TNG optical observations
  83. GRB 161017A: Fermi GBM observation
  84. GRB 161017A: Enhanced Swift-XRT position
  85. GRB 161014A: Continued RATIR Optical and NIR Observations
  86. GRB 161015A: Swift/UVOT observations
  87. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  88. GRB161017.74 MASTER-Net OT detection
  89. GRB161015A: AstroSat CZTI detection
  90. GRB 161014A: refined analysis of TSHAO optical observations
  91. GRB 161015A: Fermi GBM detection
  92. GRB161004A: Further analysis of the burst nature
  93. GRB 161014A: RATIR Optical and NIR Observations
  94. GRB 161014A: Fermi GBM observation
  95. GRB 161014A: Swift-XRT refined Analysis
  96. GRB 161014A: Swift-BAT refined analysis
  97. GRB 161014A: TNG optical observations
  98. GRB 161014A: AROMA-N Optical Observation
  99. GRB 161014A: Swift/UVOT Detection
  100. GRB161014A: NOT optical observations

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