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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27393 results found.

  1. GRB 131024A: Swift/UVOT Upper Limits
  2. GRB 131024A: Swift-XRT refined Analysis
  3. GRB 131024B: Swift detection of a burst
  4. GRB 131024A, Swift-BAT refined analysis
  5. GRB 131024A: Skynet R-COP optical observations
  6. Konus-Wind observation of GRB 131011B
  7. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  8. GRB 131024A: Swift detection of a burst
  9. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  10. IPN Triangulation of GRB 131014A
  11. GRB 131018B: Swift/UVOT Upper Limits
  12. GRB 131018B: Swift-XRT observations
  13. GRB 131018B: Fermi GBM observation
  14. GRB 131018A: RATIR Optical and NIR Observations
  15. GRB 131018A: Swift/UVOT Upper Limits
  16. GRB 131018B: Fermi-LAT detection of a burst
  17. GRB 131018A: Swift-XRT refined Analysis
  18. GRB 131018A, Swift-BAT refined analysis
  19. GRB131018A, optical observations
  20. GRB 131018A: Swift detection of a burst
  21. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  22. Fermi GBM data availability during U.S. government shutdown
  23. GRB 131014A: Swift-XRT refined Analysis
  24. GRB 131011A: Swift/UVOT Upper Limits
  25. Fermi 403206457 / GRB 131011A: AAO optical observations
  26. GRB 131014A: RATIR Optical and NIR Observations
  27. GRB 131014A: NOT afterglow candidate
  28. GRB 131014A: Nanshan optical observations
  29. GRB 131014A: Fermi-LAT detection
  30. GRB 131014A: Fermi GBM detection
  31. GRB 131011A: Fermi GBM detection
  32. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  33. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  34. Fermi403206457: continued P60 observations and fading behavior
  35. Fermi403206457: Weihai optical upper limit
  36. Fermi403206457: NOT optical observations
  37. Fermi403206457: iPTF detection of a possible optical afterglow
  38. Trigger 574266 is not a Swift detection of a known source
  39. GRB 130831A: Continued RATIR Optical and NIR Observations
  40. GRB 131004A: MOSFIRE NIR imaging
  41. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  42. GRB 131004A, Swift-BAT refined analysis
  43. GRB 131004A: Fermi GBM observation
  44. GRB 131004A: Swift/UVOT Detection
  45. GRB 131004A: RATIR Optical and NIR Upper Limits
  46. GRB 131004A: Swift-XRT refined Analysis
  47. GRB 131004A: GROND observations of the afterglow
  48. GRB 131004A: Liverpool Telescope optical afterglow observations
  49. GRB 131004A: Swift detection of a burst (may be short)
  50. GRB 131002A, Swift-BAT refined analysis
  51. GRB 131002A: Fermi GBM observation
  52. GRB 131002B, Swift-BAT refined analysis
  53. GRB 131002B: GROND upper limits
  54. GRB 131002B: Swift-XRT Refined Analysis
  55. GRB 131002B: Swift/UVOT Upper Limits
  56. GRB 131002A: Swift/UVOT Detection
  57. GRB 131001A, Swift-BAT refined analysis
  58. GRB 131002A: Swift-XRT refined Analysis
  59. GRB 131002A: ISON-NM optical observations
  60. Swift J1242.9-3530, Swift-BAT refined analysis
  61. GRB 131001A: Swift UVOT and XRT Upper Limits
  62. NuSTAR observations of GRB 130925A
  63. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  64. GRB 131002B: Swift detection of a burst
  65. GRB 131002A: Swift detection of a burst
  66. GRB 131002A: Faulkes Telescope North optical afterglow
  67. GRB 131001A detected in ground analysis of Swift-BAT data
  68. GRB 130925A: continuing Swift/XRT monitoring
  69. IPN Observations of GRB 130925A
  70. GRB 130930A: Swift detection of a burst
  71. GRB 130929A: Swift/UVOT Upper Limits
  72. GRB 130831A: Continued RATIR Optical and NIR Observations
  73. GRB 130929A: Swift-XRT refined Analysis
  74. GRB 130929A, Swift-BAT refined analysis
  75. GRB 130929A: TAROT La Silla observatory optical observations
  76. GRB 130929A: Swift detection of a burst
  77. Fermi LAT Upper Limits on GRB 130925A
  78. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  79. GRB 130925A: Swift/UVOT Upper Limits
  80. GRB 130925A: Continued RATIR Optical and NIR Observations
  81. GRB 130925A: Fermi GBM Detection
  82. Konus-Wind observation of GRB 130925A
  83. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  84. GRB 130925A: RATIR Optical and NIR Observations
  85. GRB 130925A Swift-BAT refined analysis
  86. Fermi GBM detection of GRB 130925A and a possible precursor
  87. GRB 130925A: Swift-XRT refined Analysis
  88. GRB 130925A: Initial Similarities to Swift J1644+57
  89. GRB 130925A: TAROT La Silla observatory optical observations
  90. GRB 130925A: VLT/X-shooter redshift
  91. GRB 130925A: VLT/UVES observations
  92. GRB 130925A: GROND afterglow candidate
  93. GRB 130925A: Swift detection of a burst
  94. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  95. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  96. Fermi Trigger 401326696: MASTER prompt optical observations
  97. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  98. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  99. GRB 130919A, Swift-BAT refined analysis
  100. GRB 130913A detected in ground analysis of Swift-BAT data

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