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"

36380 results found.

  1. GRB 100413A: MASTER-Net optical observations
  2. GRB 100413A: Swift detection of a burst
  3. Swift-BAT trigger 419015 is not astrophysical
  4. Trigger 419015 is probably not a GRB
  5. GRB100401A: GROND Upper Limits
  6. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  7. IBAS Alert n. 5996: not a GRB
  8. IBAS Alert n. 5995: not a GRB
  9. GRB 100331B: GROND Upper limits
  10. GRB 100401A: Swift/UVOT Upper Limit
  11. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  12. GRB 100401A: Fermi GBM detection
  13. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  14. GRB 100331B: BOOTES-3 observations
  15. GRB 100316A: R-band limit
  16. GRB 100324B: Suzaku WAM observation of the prompt emission
  17. GRB 100331B: Swift/UVOT Upper Limits
  18. GRB 100331B: Swift/XRT possible afterglow candidate
  19. GRB 100331B: SuperAGILE Localization of a Long GRB
  20. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  21. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  22. GRB 100331A: BOOTES-3 observations
  23. Konus-Wind observation of GRB 100324B
  24. GRB 100331A: A long GRB detected by INTEGRAL
  25. IPN triangulation of GRB100324B
  26. Konus-Wind observation of GRB 100322A
  27. GRB 100322A: Suzaku WAM observation of the prompt emission
  28. GRB 100325A: Fermi LAT detection
  29. GROND observations of GRB100316D/SN2010bh
  30. GRB 100325A: Fermi GBM detection
  31. GRB 100324A: GROND observations
  32. GRB 100324A found in ground analysis of BAT data
  33. Emerging Supernova in the Afterglow of GRB 100316D
  34. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  35. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  36. GRB 100322A: Fermi GBM detection
  37. GRB 100316D: ATCA radio observations
  38. GRB 100319A: correction to GCN 10527
  39. Probable SGR 1833-0832: Swift-XRT refined analysis
  40. GRB 100219A: MASTER-Net optical alert observations
  41. GRB 100319A: Swift detection of a burst; possible SGR
  42. GRB 100316D: Possible Supernova
  43. GRB 100316D: Pre-burst emission measured by BAT
  44. GRB 100316D: Further Gemini observations
  45. GRB 100219A: optical upper limit
  46. GRB 100316A: optical observations in CrAO
  47. GRB 100316D: Swift/UVOT Observations
  48. GRB 100316D: Swift XRT enhanced position and further refined analysis
  49. GRB 100316B: Swift-XRT refined analysis
  50. Tentative redshift of GRB100316D from X-ray data
  51. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  52. Trigger 416226 is probably not a GRB
  53. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  54. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  55. GRB 100316D: VLT/X-shooter observations
  56. GRB 100316D: Swift-BAT refined analysis
  57. GRB100316C: Swift/UVOT Upper Limits
  58. GRB 100316C: Swift-BAT refined analysis
  59. GRB 100316B: Swift/UVOT observations
  60. GRB 100316C: Swift-XRT team refined analysis
  61. GRB 100316C: Enhanced Swift-XRT position
  62. GRB 100316D: Swift XRT refined analysis
  63. GRB 100316A: TAROT Calern observatory optical observations
  64. GRB 100316A: Swift-XRT refined analysis
  65. GRB 100316B: Enhanced Swift-XRT position
  66. GRB 100316A: Swift-BAT refined analysis
  67. GRB 100316B: Swift-BAT refined analysis
  68. GRB100316A: Swift/UVOT Upper Limits
  69. Trigger 416140 is almost certainly not a GRB
  70. GRB 100316C: BOOTES-3 observations
  71. GRB 100316D: Swift detection of a burst
  72. GRB 100316B: VLT/X-shooter redshift
  73. GRB 100316B: Skynet/PROMPT Observations of Fading
  74. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  75. GRB 100316C: Swift detection of a burst
  76. GRB 100316A: Enhanced Swift-XRT position
  77. GRB 100316B: Swift detection of a burst with optical counterpart
  78. GRB 100316 optical candidate from 1.23m CAHA telescope
  79. GRB 100316 optical candidate from 1.23m CAHA telescope
  80. GRB 100316A: Swift/UVOT Observations
  81. GRB 100316A: Swift-XRT detection
  82. GRB 100316A: Swift detection of a burst
  83. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  84. GRB100305A: Optical upper limits at IAO
  85. GRB 100305A: Super-LOTIS early observations
  86. GRB 100305A, Swift-BAT refined analysis
  87. GRB 100305A: Gemini z'-band observation
  88. GRB 100305A: Swift/UVOT Upper Limits
  89. GRB 100305A: Swift-XRT refined analysis
  90. GRB 100305A Optical Observations
  91. GRB 100305A: Enhanced Swift-XRT position
  92. GRB 100305A: Gemini-N OT candidate
  93. GRB 100305A: PAIRITEL NIR Upper Limits
  94. GRB 100305A: P60 Observations
  95. GRB 100305A: Swift detection of a burst
  96. GRB 100302A: Ondrejov 65cm limit
  97. GRB 100302A: Swift/UVOT Upper Limits
  98. GRB 100302A: Swift-XRT refined analysis
  99. GRB 100302A: Gemini-North redshift
  100. GRB 100302A: Gemini-N OT confirmation

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