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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"

19696 results found.

  1. GRB 161117A: Enhanced Swift-XRT position
  2. GRB 161117B: Swift detection of a burst
  3. GRB161117A: REM optical and NIR afterglow detection
  4. GRB 161117A: Swift detection of a burst with an optical counterpart
  5. GRB 161113A: Swift/UVOT Upper Limits
  6. GRB 161113A: Swift-XRT refined Analysis
  7. GRB 161113A: Kuban State University optical upper limit
  8. GRB 161113A: Enhanced Swift-XRT position
  9. GRB 161113A: RATIR Optical and NIR Observations
  10. GRB 161113A: Swift detection of a burst
  11. GRB 161104A: Magellan imaging and spectroscopy
  12. GRB 161108A: continued TSHAO optical observations
  13. GRB 161104A: Chandra X-ray observations
  14. GRB 161108A: MITSuME Okayama upper limits
  15. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  16. GRB 161108A: TSHAO optical observations
  17. GRB 161108A: Swift/UVOT Upper Limits
  18. GRB 161109A: Tiled Swift observations
  19. GRB 161105A: Swift/UVOT Upper Limits
  20. GRB 161108A: TAROT Calern observatory optical observations
  21. GRB 161105A: TAROT La Silla observatory optical observations
  22. GRB 161108A: RATIR Afterglow Confirmation
  23. GRB 161108A: Enhanced Swift-XRT position
  24. GRB 161108A: NOT candidate afterglow
  25. GRB 161108A: Swift detection of a burst
  26. Fermi LAT Gamma-ray Observations of IceCube-161103
  27. GRB 161104A: Gemini South optical observations
  28. GRB 161105A: Enhanced Swift-XRT position
  29. GRB 161104A: GROND observations
  30. GRB 161105A: Swift detection of a burst
  31. GRB 161104A: Swift/UVOT Upper Limits
  32. GRB 161104A, Swift-BAT refined analysis
  33. Fermi GBM Observations of IceCube-161103
  34. IceCube-161103: Swift-XRT observations
  35. GRB 161104A: Enhanced Swift-XRT position
  36. GRB 161104A: Swift detection of a short burst
  37. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  38. HAWC follow up of IceCube-161103
  39. GRB 161023A: GROND Observations
  40. GRB 161023A: Swift-XRT afterglow detection
  41. GRB 161023A: TAROT La Silla observatory optical observations
  42. GRB 161023A: Zadko observatory - Gingin optical observations
  43. GRB 161023A: Watcher optical observations
  44. GRB 161023A: Swift ToO observations
  45. Swift Trigger 718919 is not an astrophysical event.
  46. GRB 161022A: RATIR Optical and NIR Observations
  47. GRB 161022A: Swift/UVOT Upper Limits
  48. GRB 161022A: NOT optical observations
  49. GRB 161022A: Enhanced Swift-XRT position
  50. GRB 161022A: Swift-XRT refined Analysis
  51. IPN Triangulation of GRB 161020B
  52. GRB 161022A: TAROT Calern observatory optical observations
  53. GRB 161022A: Swift detection of a burst
  54. GRB 161015A: further Swift-XRT follow-up observations
  55. GRB161017A optical R band observations with SARA-RM
  56. GRB 161017A: Swift/UVOT Detection
  57. GRB 161017A: TNG optical observations
  58. GRB 161017A: Enhanced Swift-XRT position
  59. GRB 161014A: Continued RATIR Optical and NIR Observations
  60. GRB 161015A: Swift/UVOT observations
  61. GRB 161017A: Swift detection of a burst with a bright optical afterglow
  62. GRB 161014A: refined analysis of TSHAO optical observations
  63. GRB 161015A: Tiled Swift observations
  64. GRB 161014A: RATIR Optical and NIR Observations
  65. GRB 161014A: Swift-XRT refined Analysis
  66. GRB 161014A: TNG optical observations
  67. GRB 161014A: AROMA-N Optical Observation
  68. GRB 161014A: Swift/UVOT Detection
  69. GRB161014A: NOT optical observations
  70. GRB 161014A: TSHAO optical observations
  71. GRB 161011A: RATIR Optical and NIR Observations
  72. GRB 161014A: Swift-XRT and UVOT afterglow detection
  73. GRB 161014A: Swift detection of a burst
  74. GRB 161010A: Swift/UVOT Possible Detection
  75. GRB 161010A: CALET Gamma-Ray Burst Monitor detection
  76. GRB 161011A: TSHAO afterglow candidate
  77. GRB 161011A: Swift/UVOT Upper Limits
  78. GRB 161011A: Swift-XRT refined Analysis
  79. GRB 161011A: Enhanced Swift-XRT position
  80. GRB 161010A: Swift-XRT afterglow detection
  81. GRB 161011A: Swift detection of a burst
  82. GRB 161010A: Swift ToO observations
  83. GRB 161007A: NOT optical observations
  84. GRB 161007A: AbAO optical observations
  85. GRB 161007A: Mondy optical observations
  86. GRB 161007A: Swift/UVOT Upper Limits
  87. GRB 161007A: Swift-XRT refined Analysis
  88. GRB 161007A: GTC observations
  89. GRB 161007A: Enhanced Swift-XRT position
  90. GRB 161004A: Maidanak optical observations
  91. GRB 161004A: refined analysis of TSHAO optical observations
  92. GRB 161007A: Swift detection of a burst
  93. GRB 160821A: Maisoncelles observatory optical observations
  94. GRB 160925A: Kottamia R-band observation
  95. GRB 160927A: GTC observations
  96. GRB 161004A: Swift-BAT refined analysis
  97. GRB 150302A: late-time imaging and optical afterglow confirmation
  98. GRB 161001A: IRSF upper limits
  99. GRB 161004B: Swift/UVOT Upper Limits
  100. GRB 161004A: RATIR Optical and NIR Observations

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