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"

19663 results found.

  1. GRB 140709A: Swift detection of a burst
  2. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  3. GRB 140706A: Swift/UVOT Detection
  4. GRB 140703A: Swift/UVOT Upper Limits
  5. GRB 140706A: Swift-BAT refined analysis
  6. GRB 140706A: Swift-XRT refined Analysis
  7. GRB 140706A: Fermi GBM detection
  8. GRB 140703A: AAO optical observations
  9. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  10. GRB140706A: GROND detection of the Optical/NIR afterglow
  11. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  12. GRB 140706A: Enhanced Swift-XRT position
  13. GRB 140706A: Swift detection of a burst with an optical counterpart
  14. SGR 1935+2154: Swift-BAT observations of additional short soft events
  15. GRB 140705A / SGR 1935+2154: FTN observations
  16. GRB 140705A: KAIT Optical Upper Limit
  17. GRB 140705A: Swift-XRT refined Analysis
  18. GRB 140705A: Swift/UVOT Upper Limits
  19. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  20. GRB 140705A: Enhanced Swift-XRT position
  21. GRB 140705A: Swift detection of a short burst
  22. GRB 140621A: Suzaku WAM observation of the prompt emission
  23. GRB 140629A, Optical observations
  24. GRB 140703A: RATIR Optical and NIR Observations
  25. GRB 140703A: Fermi GBM detection
  26. GRB 140703A: Swift-XRT refined Analysis
  27. GRB 140703A: Swift-BAT refined analysis
  28. GRB 140703A: Enhanced Swift-XRT position
  29. GRB 140703A: BOOTES-2 and OSN optical observations
  30. GRB 140703A: Swift detection of a burst
  31. GRB 140629A: MASTER-Net preliminary light curve
  32. GRB 140629A: SAO RAS monitoring
  33. Konus-Wind observation of GRB 140629A
  34. GRB 140629A: Swift/UVOT Detection
  35. GRB 140629A: P60 observations
  36. GRB 140629A: Swift-XRT refined Analysis
  37. GRB 140629A: BTA redshift
  38. GRB140629A: Kanata/HOWPol optical observation
  39. GRB 140629A: T100 observations
  40. GRB 140629A: Swift-BAT refined analysis
  41. GRB 140629A: Enhanced Swift-XRT position
  42. GRB 140629A: MASTER OT detection
  43. GRB 140629A: Swift detection of a burst with an optical counterpart
  44. GRB 140628A: GROND observation of the afterglow
  45. GRB 140628A: Swift-XRT refined Analysis
  46. GRB 140628A: Zadko observatory - Gingin optical observations
  47. GRB 140628A: Swift-BAT refined analysis
  48. GRB 140628A: Swift/UVOT Detection
  49. GRB 140628A: Swift/UVOT Detection
  50. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  51. GRB 140626A: TAROT La Silla observatory optical observations
  52. GRB 140622A: TAROT La Silla observatory optical observations
  53. GRB 140628A: Swift detection of a burst
  54. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  55. GRB 140623A: further Swift-XRT observations
  56. Swift Trigger 602668 is probably not an astrophysical source
  57. GRB 140626A: Swift-BAT refined analysis
  58. GRB 140626A: Swift-XRT refined Analysis
  59. GRB 140626A: Swift/UVOT Upper Limits
  60. GRB 140626A: Enhanced Swift-XRT position
  61. GRB 140626A: GROND Afterglow Candidate
  62. GRB 140626A: Swift detection of a burst
  63. Further Swift/XRT observations of GRB140620A/iPTFcva
  64. GRB 140623A: Swift-XRT and UVOT observations
  65. GRB 140621A: Swift-XRT observations
  66. GRB 140622A: iTelescope.Net T11 Optical Observation
  67. GRB 140622A: Swift/UVOT Upper Limits
  68. IPN Triangulation of GRB 140621A
  69. Konus-Wind observation of GRB 140619A
  70. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  71. GRB 140622A: KAIT Optical Upper Limit
  72. GRB 140622A: Swift-XRT refined Analysis
  73. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  74. GRB 140622A: RATIR Optical and NIR Observations
  75. GRB 140622A: GROND Upper limits
  76. GRB 140622A: Enhanced Swift-XRT position
  77. GRB 140622A: Swift detection of a short burst
  78. GRB 140620A: Swift/UVOT Detection
  79. GRB 140620A: Swift-XRT observations
  80. GRB 140619B: Swift-XRT observations
  81. GRB 140619A: Swift-BAT refined analysis
  82. GRB 140610A: TShAO optical upper limit
  83. GRB 140619B: Fermi-LAT Detection
  84. GRB 140619A: Swift/UVOT Observations
  85. GRB 140619A: Swift-XRT refined Analysis
  86. GRB 140619A: Enhanced Swift-XRT position
  87. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  88. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  89. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  90. GRB 140606B: Swift XRT final light curve
  91. GRB 140614C: 1.23m CAHA (+EDIPO) observations
  92. GRB 140614B: MOSFIRE Ks-band nondetection
  93. GRB 140614C found in ground analysis of BAT data
  94. GRB 140614B: Swift-XRT refined Analysis
  95. GRB 140614B: Swift-BAT refined analysis
  96. GRB 140614A: Swift-BAT refined analysis
  97. GRB 140614A: X-shooter redshift
  98. GRB 140614B: Swift/UVOT Upper Limits
  99. GRB 140614B: RATIR Optical and NIR Observations
  100. GRB 140614A: Swift/UVOT Upper Limits

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