Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

28292 results found.

  1. GRB 180205A: Nickel telescope optical observations
  2. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  3. GRB 180205A: Mondy optical observations
  4. GRB 180205A: GROND detection of the NIR/optical afterglow
  5. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  6. GRB 180204A: Swift-BAT refined analysis
  7. GRB 180204A: Swift/UVOT Upper Limits
  8. GRB 180204A: Enhanced Swift-XRT position
  9. GRB 180204A: Swift-XRT refined Analysis
  10. GRB 180204A: Swift detection of a short burst
  11. GW170817/GRB170817A: Preliminary results of Chandra monitoring
  12. LIGO/Virgo GW170817: Chandra X-ray Emission Continues to Rise ~156 Days Post-Merger
  13. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  14. GRB 180120A: Fermi GBM Detection
  15. GRB 180113B: AstroSat CZTI detection
  16. GRB 180115A: SEDM Observations
  17. Konus-Wind observation of GRB 171209A
  18. GRB 180116A: Fermi GBM Detection
  19. GRB 180111A AROMA-N optical observation
  20. IPN Triangulation of GRB 180113C
  21. GRB 180115A: Swift-BAT refined analysis
  22. GRB 180116A: MAXI/GSC detection
  23. GRB 180115A: NOT detection of optical counterpart
  24. Konus-Wind observation of GRB 180113A
  25. GRB 180113C: Insight-HXMT/HE observation
  26. GRB 180113B: Insight-HXMT/HE observation
  27. GRB 180115A: Swift-XRT refined Analysis
  28. GRB 180115A: Enhanced Swift-XRT position
  29. GRB 180115A: Swift detection of a burst with an optical counterpart.
  30. GRB 180113C: Fermi GBM detection
  31. GRB 180113A: Swift-BAT refined analysis
  32. GRB 180111A: AbAO optical observations
  33. GRB 180113A: KAIT Optical Observations
  34. GRB 180113B: Fermi GBM detection
  35. GRB 180113A: Fermi GBM observation
  36. GRB 180111A: Swift/UVOT Detection
  37. GRB 180103A: Swift-XRT afterglow detection
  38. GRB 180111A: Swift-BAT refined analysis
  39. GRB 180111A: RATIR Optical and NIR Observations
  40. GRB 180111A: Swift-XRT refined Analysis
  41. GRB 180111A: Enhanced Swift-XRT position
  42. GRB 180111A: Swift detection of a burst with an optical counterpart
  43. GRB 180103A: LCO Sutherland 1-m telescope observations
  44. GRB 180103A: Swift/UVOT Upper Limits
  45. GRB 180103A: Swift-XRT observations
  46. GRB 180102A AROMA-N optical observation
  47. GRB 180102A: TSHAO optical upper limit
  48. GRB 180102A: Swift-BAT refined analysis
  49. GRB 180102A: Swift/UVOT Upper Limits
  50. GRB 180102A: NOT optical observations
  51. GRB 180102A: Swift-XRT refined Analysis
  52. GRB 180102A: Fermi GBM detection
  53. GRB 180102A: Enhanced Swift-XRT position
  54. GRB 180102A: Swift detection of a burst
  55. GRB 171227A: Fermi GBM detection
  56. IceCube-171106A: Konus-Wind upper limits
  57. IceCube-171015A: Konus-Wind upper limits
  58. IceCube-170922A: Konus-Wind upper limits
  59. GRB 171222A: Swift-BAT refined analysis
  60. GRB 171222A: AROMA-N optical observation
  61. GRB 171223A: Fermi GBM detection
  62. GRB 171222A: Nanshan-0.36m optical upper limit
  63. GRB 171222A: Swift/UVOT Upper Limits
  64. GRB 171222A: Nanshan-1m optical afterglow detection
  65. GRB 171222A: Swift-XRT refined Analysis
  66. GRB 171205A: SMARTS optical/IR supernova monitoring
  67. GRB 171222A: Enhanced Swift-XRT position
  68. GRB 171222A: Swift detection of a burst
  69. GRB 171216A: Swift/UVOT Upper Limits
  70. GRB 171216A: Swift-XRT refined Analysis
  71. GRB 171216A: Swift-BAT refined analysis
  72. GRB 171205A: RATAN observations
  73. GRB 171216A: Enhanced Swift-XRT position
  74. GRB 171216A: Swift detection of a burst
  75. Swift Trigger 797070 is probably not a GRB
  76. GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
  77. GRB 171212A: Swift-XRT refined Analysis
  78. GRB 171211A iTelescope observation
  79. GRB 171212B: Fermi GBM observation
  80. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  81. GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
  82. GRB 171212A: Enhanced Swift-XRT position
  83. GRB 171212A: Swift detection of a burst or a Galactic transient
  84. GRB 171211A: Swift-BAT refined analysis
  85. GRB 171211A: Swift-XRT refined Analysis
  86. GRB 171211A: Swift/UVOT Upper Limits
  87. GRB 171211A: Enhanced Swift-XRT position
  88. GRB 171210A: Swift-XRT and UVOT observations
  89. GRB 171211A: Swift detection of a possibly short burst
  90. GRB 171210A: Fermi GBM detection
  91. GRB 171209A: Lulin 1m telescope observations
  92. GRB 171209A: Swift-BAT refined analysis
  93. Konus-Wind observation of GRB 171205A
  94. GRB 171205A: iTelescope optical observations
  95. GRB 171205A: Mondy optical observations
  96. GRB 171205A: SAO-RAS optical observations
  97. GRB 171209A: Swift/UVOT Analysis of the burst
  98. GRB 171209A: Swift-XRT refined Analysis
  99. GRB 171209A: Enhanced Swift-XRT position
  100. Swift Trigger 796115 is probably not a GRB

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov