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"

19664 results found.

  1. INTEGRAL observations of Swift GRB trigger 421072
  2. GRB100423A : Suzaku WAM observation of the prompt emission
  3. Trigger 421072: Possible Swift detection of a GRB or transient
  4. GRB 100420A: Terskol optical upper limit
  5. GRB 100427A: Swift XRT and UVOT Upper Limits
  6. GRB 100427A: Fermi GBM detection
  7. GRB 100427A detected in ground analysis of Swift BAT data
  8. Konus-Wind observation of GRB 100423A
  9. GRB 100423A: CrAO optical observations
  10. GRB 100418A: Terskol optical observations
  11. GRB 100424A: CrAO optical observations
  12. GRB 100425A: Swift XRT refined analysis
  13. GRB100425A: Swift/UVOT Upper Limits
  14. GRB 100424A: Swift/UVOT Upper Limits
  15. GRB 100425A: Enhanced Swift-XRT position
  16. GRB 100425A: Swift-BAT refined analysis
  17. GRB 100425A: GROND afterglow observation
  18. GRB 100424A: D50 optical limits
  19. GRB 100424A : Lulin early z'-band upper limit
  20. GRB 100424A: GROND Upper Limits
  21. GRB 100424A: PAIRITEL NIR Upper Limits
  22. GRB 100424A: Swift-XRT refined analysis
  23. GRB 100425A: Swift detection of a burst
  24. GRB 100424A, Swift-BAT refined analysis
  25. GRB 100424A: Enhanced Swift-XRT position
  26. GRB 100424A: Prompt enhanced Swift-XRT position.
  27. GRB 100424A: Swift detection of a burst
  28. GRB 100420A: GRT Optical Observation
  29. Swift-BAT refined analysis of trigger 420256
  30. Swift Trigger 420256: D50 optical limits
  31. GRB 100418A: Possible Evidence for a Supernova
  32. GRB 100420A: Swift-BAT refined analysis
  33. GRB 100423A: Swift-BAT refined analysis
  34. Swift Trigger 420256: IAC80 R-band observations
  35. Swift Trigger 420256: BOOTES-2 observations
  36. Swift Trigger 420256: ROTSE-III Optical Limits
  37. Trigger 420256: Swift detection of a possible GRB
  38. GRB 100423A: Skynet/PROMPT Detections
  39. GRB 100423A: GROND discovery of afterglow
  40. GRB 100423A: Swift detection of a burst
  41. Radio afterglow detection of GRB 100418A with the EVLA
  42. GRB 100418A: Continued PAIRITEL NIR Observations
  43. GRB 100418A: Continuing Swift/UVOT Observations
  44. GRB 100420A: Swift/UVOT Upper Limits
  45. GRB 100420A: XRT refined analysis
  46. GRB 100420A: Enhanced Swift-XRT position
  47. GRB 100418A: optical observations
  48. GRB 100418A: MASTER-Net optical observations
  49. GRB 100414A: Confirmation of the X-ray afterglow
  50. GRB 100420A: ROTSE-III Optical Limits
  51. GRB 100420A: Swift detection of a burst
  52. GRB 100418A PAIRITEL NIR Observations
  53. GRB 100418A: ROVOR optical afterglow detection
  54. GRB 100418A: Swift/UVOT Observations
  55. GRB 100418A: Gemini-N redshift confirmation
  56. GRB 100418A: Swift-XRT Refined Analysis
  57. GRB 100418A: Swift-BAT refined analysis
  58. GRB 100418A: Enhanced Swift-XRT position
  59. GRB 100418A: ROTSE-III Optical Limits
  60. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  61. GRB 100413A: Radio Afterglow Detection with the EVLA
  62. GRB 100414A: Swift/UVOT Observations
  63. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  64. GRB 100413A: Suzaku WAM observation of the prompt emission
  65. GRB 100413B: Swift Confirmation of Burst
  66. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  67. GRB 100413A: Swift-BAT final refined analysis
  68. GRB 100414A: IPN Localization
  69. GRB 100413B : Swift detection of a burst
  70. GRB 100413A: GROND Upper limits
  71. GRB 100413A: Swift/UVOT Upper Limits
  72. Konus-Wind observation of GRB 100413A
  73. GRB 100413A: Faulkes Telescope South observations
  74. Tentative redshift of GRB100413A from X-ray data
  75. GRB 100413A: Swift-XRT Refined Analysis
  76. GRB 100413A: Swift-BAT initial refined analysis
  77. GRB 100413A: Enhanced Swift-XRT position
  78. GRB 100413A: MASTER-Net optical observations
  79. GRB 100413A: Swift detection of a burst
  80. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  81. Swift-BAT trigger 419015 is not astrophysical
  82. Trigger 419015 is probably not a GRB
  83. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  84. MASTER observations on the Swift second trigger on LS V +44 17
  85. GRB 100331B: GROND Upper limits
  86. Master-Net observations on the Swift trigger on LS V +44 17
  87. GRB 100401A: Swift/UVOT Upper Limit
  88. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  89. GRB 100401A: Fermi GBM detection
  90. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  91. GRB 100331B: BOOTES-3 observations
  92. GRB 100331B: Swift/UVOT Upper Limits
  93. GRB 100331B: Swift/XRT possible afterglow candidate
  94. Swift detection of LS V +44 17
  95. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  96. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  97. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  98. GROND observations of GRB100316D/SN2010bh
  99. GRB 100324A: GROND observations
  100. GRB 100324A found in ground analysis of BAT data

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