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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"

27226 results found.

  1. GRB 161214A: fading optical afterglow candidate with the LT
  2. GRB 161214A: A long GRB detected by INTEGRAL
  3. GRB 161207A: CALET Gamma-Ray Burst Monitor detection
  4. GRB 161203A: POLAR Detection
  5. GRB 161203A: Astrosat CZTI (Veto) detection
  6. GRB 161203A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 161206A: Fermi GBM detection
  8. MASTER: Optical Blazar Flare Detection during Fermi trigger 502272781 inspection
  9. GRB 161129A: POLAR Detection
  10. GRB 161202A: Astrosat CZTI detection
  11. GRB 161202A: RATIR Optical and NIR Observations
  12. GRB 161202A: Swift-BAT refined analysis
  13. GRB 161202A: Swift/UVOT Upper Limits
  14. GRB 161202A: Swift-XRT refined Analysis
  15. GRB 161202A: Fermi-LAT detection
  16. GRB 161202A: Swift detection of a burst
  17. Fermi GBM trigger 502258294/161201175 is not a GRB
  18. GRB 161129A: MITSuME Okayama Ks-band Observation
  19. Fermi Gamma-ray Burst Monitor trigger 161130183 is not a GRB
  20. GRB 161129A: Swift-BAT refined analysis
  21. GRB 161129A: Fermi GBM Detection
  22. GRB 161129A: Swift/UVOT Detection
  23. GRB161129A : Astrosat CZTI detection
  24. GRB 161129A: Swift-XRT refined Analysis
  25. GRB 161129A: Swift detection of a burst
  26. Fermi GBM trigger 501785179/161125699 is not a GRB
  27. Fermi GBM trigger 501779084/161125628 is not a GRB
  28. Swift Trigger 723539 is not an astrophysical event
  29. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  30. Swift Trigger 723124 is probably not a GRB
  31. GRB 161117B: Swift-XRT refined Analysis
  32. GRB 161117A iTelescope observation
  33. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  34. GRB 161117A: TAROT La Silla observatory optical observations
  35. GRB 161117A: GMG observation limit
  36. GRB 161117A: Fermi GBM detection/observation
  37. GRB 161117B: Swift/UVOT Upper Limits
  38. GRB 161117A: Swift/UVOT Detection
  39. GRB 161117B: Swift-BAT refined analysis
  40. GRB 161117A: Swift-BAT refined analysis
  41. Swift Trigger 722681 is probably not a GRB
  42. GRB 161117A: Swift-XRT refined Analysis
  43. GRB 161117B: LCO optical observations
  44. GRB 161117B: Swift detection of a burst
  45. GRB 161117A: Swift detection of a burst with an optical counterpart
  46. GRB 161113A: Swift-BAT refined analysis
  47. GRB 161113A: Swift/UVOT Upper Limits
  48. GRB 161113A: Swift-XRT refined Analysis
  49. GRB 161113A: RATIR Optical and NIR Observations
  50. GRB 161113A: Swift detection of a burst
  51. GRB 161109A: CALET Gamma-Ray Burst Monitor detection
  52. GRB 161109A: Swift/UVOT Upper Limits
  53. GRB 161104A: Chandra X-ray observations
  54. GRB 161109A: Lomonosov BDRG gamma ray discovery
  55. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  56. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 161108A: Swift/UVOT Upper Limits
  58. GRB 161105A: Swift/UVOT Upper Limits
  59. GRB 161109A: Fermi GBM observation
  60. GRB 161109A: Fermi-LAT detection
  61. GRB 161106A: Lomonosov BDRG gamma ray discovery
  62. GRB 161108A: TAROT Calern observatory optical observations
  63. GRB 161105A: TAROT La Silla observatory optical observations
  64. GRB 161108A, Swift-BAT refined analysis
  65. GRB 161108A: RATIR Afterglow Confirmation
  66. GRB 161108A: Swift-XRT refined Analysis
  67. GRB 161108A: NOT candidate afterglow
  68. GRB 161108A: Swift detection of a burst
  69. GRB 161106A: Fermi GBM detection
  70. GRB 161105A: Swift-XRT refined Analysis
  71. GRB 161104A: Gemini South optical observations
  72. GRB 161105A: Swift-BAT refined analysis
  73. GRB 161105A: MASTER-IAC early optical observations
  74. GRB 161104A: GROND observations
  75. GRB 161105A: Swift detection of a burst
  76. GRB 161104A: Swift/UVOT Upper Limits
  77. GRB 161104A, Swift-BAT refined analysis
  78. GRB 161104A: Swift-XRT refined Analysis
  79. Fermi GBM Observations of IceCube-161103
  80. GRB 160928A: The first GRB detected by POLAR
  81. IceCube-161103: Swift-XRT observations
  82. GRB 161104A: Swift detection of a short burst
  83. IceCube-161103: MASTER follow-up observations
  84. GRB 161020A: Fermi GBM observation
  85. Fermi GBM trigger 499467682/161029876 is not a GRB
  86. GRB161023A: AstroSat CZTI detection
  87. GRB 161023A: GROND Observations
  88. GRB 161023A: TAROT La Silla observatory optical observations
  89. GRB 161023A: Zadko observatory - Gingin optical observations
  90. GRB 161023A: Watcher optical observations
  91. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  92. Swift Trigger 718919 is not an astrophysical event.
  93. GRB 161022A: Swift-BAT refined analysis
  94. Swift Trigger 718766 is not an astrophysical event.
  95. GRB 161022A: RATIR Optical and NIR Observations
  96. GRB 161022A: Swift/UVOT Upper Limits
  97. GRB 161022A: Fermi GBM observation
  98. GRB 161022A: NOT optical observations
  99. GRB 161022A: Swift-XRT refined Analysis
  100. GRB 161022A: LT observations

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