Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

19611 results found.

  1. GRB 100418A: Swift/UVOT Observations
  2. GRB 100418A: Gemini-N redshift confirmation
  3. GRB 100418A: Swift-XRT Refined Analysis
  4. GRB 100418A: Swift-BAT refined analysis
  5. GRB 100418A: Enhanced Swift-XRT position
  6. GRB 100418A: ROTSE-III Optical Limits
  7. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  8. GRB 100413A: Radio Afterglow Detection with the EVLA
  9. GRB 100414A: Swift/UVOT Observations
  10. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  11. GRB 100413A: Suzaku WAM observation of the prompt emission
  12. GRB 100413B: Swift Confirmation of Burst
  13. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  14. GRB 100413A: Swift-BAT final refined analysis
  15. GRB 100414A: IPN Localization
  16. GRB 100413B : Swift detection of a burst
  17. GRB 100413A: GROND Upper limits
  18. GRB 100413A: Swift/UVOT Upper Limits
  19. Konus-Wind observation of GRB 100413A
  20. GRB 100413A: Faulkes Telescope South observations
  21. Tentative redshift of GRB100413A from X-ray data
  22. GRB 100413A: Swift-XRT Refined Analysis
  23. GRB 100413A: Swift-BAT initial refined analysis
  24. GRB 100413A: Enhanced Swift-XRT position
  25. GRB 100413A: MASTER-Net optical observations
  26. GRB 100413A: Swift detection of a burst
  27. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  28. Swift-BAT trigger 419015 is not astrophysical
  29. Trigger 419015 is probably not a GRB
  30. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  31. MASTER observations on the Swift second trigger on LS V +44 17
  32. GRB 100331B: GROND Upper limits
  33. Master-Net observations on the Swift trigger on LS V +44 17
  34. GRB 100401A: Swift/UVOT Upper Limit
  35. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  36. GRB 100401A: Fermi GBM detection
  37. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  38. GRB 100331B: BOOTES-3 observations
  39. GRB 100331B: Swift/UVOT Upper Limits
  40. GRB 100331B: Swift/XRT possible afterglow candidate
  41. Swift detection of LS V +44 17
  42. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  43. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  44. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  45. GROND observations of GRB100316D/SN2010bh
  46. GRB 100324A: GROND observations
  47. GRB 100324A found in ground analysis of BAT data
  48. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  49. SGR 1833-0832: Swift/UVOT Upper Limits
  50. SGR 1833-0832: Archival Chandra Observations
  51. SGR 1833-0832 is pulsed at 7.56 seconds
  52. SGR 1833-0832 is pulsed at 7.56 seconds
  53. Discovery of the Spin Period of SGR 1833-0832
  54. GRB 100319A: correction to GCN 10527
  55. Probable SGR 1833-0832: Swift-XRT refined analysis
  56. Probable SGR 1833-0832: Enhanced Swift-XRT position
  57. Swift-XRT refined position of the probable new SGR 1833-0832
  58. Swift-BAT refined analysis of the probable new SGR 1833-0832
  59. GRB 100219A: MASTER-Net optical alert observations
  60. GRB 100319A: Swift detection of a burst; possible SGR
  61. GRB 100316D: Pre-burst emission measured by BAT
  62. GRB 100219A: optical upper limit
  63. GRB 100316A: optical observations in CrAO
  64. GRB 100316D: Swift/UVOT Observations
  65. GRB 100316D: Swift XRT enhanced position and further refined analysis
  66. GRB 100316B: Swift-XRT refined analysis
  67. Tentative redshift of GRB100316D from X-ray data
  68. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  69. Trigger 416226 is probably not a GRB
  70. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  71. GRB 100316D: Swift-BAT refined analysis
  72. GRB100316C: Swift/UVOT Upper Limits
  73. GRB 100316C: Swift-BAT refined analysis
  74. GRB 100316B: Swift/UVOT observations
  75. GRB 100316C: Swift-XRT team refined analysis
  76. GRB 100316C: Enhanced Swift-XRT position
  77. GRB 100316D: Swift XRT refined analysis
  78. GRB 100316A: TAROT Calern observatory optical observations
  79. GRB 100316A: Swift-XRT refined analysis
  80. GRB 100316B: Enhanced Swift-XRT position
  81. GRB 100316A: Swift-BAT refined analysis
  82. GRB 100316B: Swift-BAT refined analysis
  83. GRB100316A: Swift/UVOT Upper Limits
  84. Trigger 416140 is almost certainly not a GRB
  85. GRB 100316D: Swift detection of a burst
  86. GRB 100316B: Skynet/PROMPT Observations of Fading
  87. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  88. GRB 100316C: Swift detection of a burst
  89. GRB 100316A: Enhanced Swift-XRT position
  90. GRB 100316B: Swift detection of a burst with optical counterpart
  91. GRB 100316A: Swift/UVOT Observations
  92. GRB 100316A: Swift-XRT detection
  93. GRB 100316A: Swift detection of a burst
  94. GRB 100305A, Swift-BAT refined analysis
  95. GRB 100305A: Swift/UVOT Upper Limits
  96. GRB 100305A: Swift-XRT refined analysis
  97. GRB 100305A Optical Observations
  98. GRB 100305A: Enhanced Swift-XRT position
  99. GRB 100305A: PAIRITEL NIR Upper Limits
  100. GRB 100305A: Swift detection of a burst

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