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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"

27636 results found.

  1. GRB 161212A: POLAR Detection
  2. GRB 161219B: GROND afterglow observations
  3. GRB 161219B: Swift-XRT refined Analysis
  4. GRB 161219B: Swift detection of a burst with an optical afterglow
  5. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  6. GRB 161218A: Swift-BAT refined analysis
  7. Konus-Wind observation of GRB 161218A
  8. Swift Trigger 727422 is not an astrophysical event.
  9. GRB 161218A: TAROT Calern observatory optical observations
  10. GRB 161217A: TAROT Calern observatory optical observations
  11. GRB 161218B: POLAR observation
  12. GRB 161218A: POLAR observation
  13. GRB 161218B: Fermi GBM detection
  14. GRB 161217A: Swift-BAT refined analysis
  15. GRB 161218A: Swift detection of a burst
  16. GRB 161217A: Swift/UVOT Upper Limits
  17. GRB 161217A: Swift-XRT refined Analysis
  18. GRB 161207A: POLAR observation
  19. GRB 161217A: Swift detection of a burst
  20. GRB 161213A: POLAR Observation
  21. GRB 161207B: POLAR observation
  22. GRB 161210A: POLAR observation
  23. GRB 161214B: Swift-BAT refined analysis
  24. GRB 161214B: RATIR Optical and Near-Infrared Observations
  25. GRB 161214B: Swift-XRT refined Analysis
  26. GRB 161214B: TAROT Calern observatory optical observations
  27. GRB 161214B: Chante-perdrix observatory optical observations
  28. GRB 161214B: Swift/UVOT Observations
  29. GRB 161214B: Swift detection of a burst
  30. GRB 161214A: GROND afterglow observations
  31. GRB 161214A: TAROT Calern observatory optical observations
  32. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  33. GRB 161214A: fading optical afterglow candidate with the LT
  34. GRB 161214A: A long GRB detected by INTEGRAL
  35. GRB 161207A: CALET Gamma-Ray Burst Monitor detection
  36. GRB 161203A: POLAR Detection
  37. GRB 161203A: Astrosat CZTI (Veto) detection
  38. GRB 161203A: CALET Gamma-Ray Burst Monitor detection
  39. GRB 161206A: Fermi GBM detection
  40. Konus-Wind observation of GRB 161202A
  41. MASTER: Optical Blazar Flare Detection during Fermi trigger 502272781 inspection
  42. GRB 161129A: POLAR Detection
  43. GRB 161202A: Astrosat CZTI detection
  44. GRB 161202A: RATIR Optical and NIR Observations
  45. GRB 161202A: Swift-BAT refined analysis
  46. GRB 161202A: Swift/UVOT Upper Limits
  47. GRB 161202A: Swift-XRT refined Analysis
  48. GRB 161202A: Fermi-LAT detection
  49. GRB 161202A: Swift detection of a burst
  50. Fermi GBM trigger 502258294/161201175 is not a GRB
  51. GRB 161129A: MITSuME Okayama Ks-band Observation
  52. Fermi Gamma-ray Burst Monitor trigger 161130183 is not a GRB
  53. GRB 161129A: Swift-BAT refined analysis
  54. GRB 161129A: Fermi GBM Detection
  55. GRB 161129A: Swift/UVOT Detection
  56. GRB161129A : Astrosat CZTI detection
  57. GRB 161129A: Swift-XRT refined Analysis
  58. GRB 161129A: Swift detection of a burst
  59. Fermi GBM trigger 501785179/161125699 is not a GRB
  60. Fermi GBM trigger 501779084/161125628 is not a GRB
  61. Swift Trigger 723539 is not an astrophysical event
  62. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  63. Swift Trigger 723124 is probably not a GRB
  64. GRB 161117B: Swift-XRT refined Analysis
  65. Konus-Wind observation of GRB 161117A
  66. GRB 161117A iTelescope observation
  67. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  68. GRB 161117A: TAROT La Silla observatory optical observations
  69. GRB 161117A: GMG observation limit
  70. GRB 161117A: Fermi GBM detection/observation
  71. GRB 161117B: Swift/UVOT Upper Limits
  72. GRB 161117A: Swift/UVOT Detection
  73. GRB 161117B: Swift-BAT refined analysis
  74. GRB 161117A: Swift-BAT refined analysis
  75. Swift Trigger 722681 is probably not a GRB
  76. GRB 161117A: Swift-XRT refined Analysis
  77. GRB 161117B: LCO optical observations
  78. GRB 161117B: Swift detection of a burst
  79. GRB 161117A: Swift detection of a burst with an optical counterpart
  80. GRB 161113A: Swift-BAT refined analysis
  81. GRB 161113A: Swift/UVOT Upper Limits
  82. GRB 161113A: Swift-XRT refined Analysis
  83. GRB 161113A: RATIR Optical and NIR Observations
  84. GRB 161113A: Swift detection of a burst
  85. GRB 161109A: CALET Gamma-Ray Burst Monitor detection
  86. GRB 161109A: Swift/UVOT Upper Limits
  87. GRB 161104A: Chandra X-ray observations
  88. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  89. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  90. GRB 161108A: Swift/UVOT Upper Limits
  91. GRB 161105A: Swift/UVOT Upper Limits
  92. GRB 161109A: Fermi GBM observation
  93. GRB 161109A: Fermi-LAT detection
  94. GRB 161106A: Lomonosov BDRG gamma ray discovery
  95. GRB 161108A: TAROT Calern observatory optical observations
  96. GRB 161105A: TAROT La Silla observatory optical observations
  97. GRB 161108A, Swift-BAT refined analysis
  98. GRB 161108A: RATIR Afterglow Confirmation
  99. GRB 161108A: Swift-XRT refined Analysis
  100. GRB 161108A: NOT candidate afterglow

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