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"

19316 results found.

  1. GRB 071112C: Swift detection of a burst with an optical counterpart
  2. GRB 071112B: Swift detection of a short hard burst
  3. GRB 071112: Swift detection of a possible burst
  4. GRB 071109: Swift-XRT possible X-ray counterpart
  5. GRB 071109: IBIS refined analysis
  6. GRB 071104: Swift-XRT Team Refined Analysis
  7. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  8. GRB 071101, Swift-BAT refined analysis
  9. GRB 071101: Swift-XRT Team refined analysis
  10. GRB071101: Optical and NIR upper limits by KANATA
  11. GRB 071101: Swift XRT position
  12. GRB 071101: Swift detection of a burst
  13. GRB 071031, Swift-BAT refined analysis
  14. GRB 071031: Swift-XRT Team refined analysis
  15. GRB 071031: Swift detection of a burst with an optical counterpart
  16. GRB 071028B Swift-BAT detection of a burst
  17. GRB 071028: Swift-XRT Team refined analysis
  18. GRB 071028, Swift-BAT refined analysis
  19. GRB071020, optical upper limit
  20. GRB 071025: Swift-XRT Team refined analysis
  21. GRB 060602A: host redshift
  22. GRB 071025, Swift-BAT refined analysis
  23. GRB 071025: ROTSE-III Refined Analysis
  24. GRB 071025: ROTSE-III Detection of Optical Counterpart
  25. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  26. GRB 071020: SARA observations
  27. GRB 071021: optical and NIR observations
  28. GRB 071021: possible high-z burst
  29. GRB 071021, Swift-BAT refined analysis
  30. GRB071018: 2nd epoch obsevations of Xinglong TNT
  31. GRB 071021: Swift-XRT Team refined analysis
  32. GRB 071021 : Lulin R-band limit
  33. GRB 071020: Swift-XRT refined analysis
  34. GRB 071020, Swift-BAT refined analysis
  35. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  36. GRB071020 - SDSS Pre-burst Observations
  37. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  38. GRB 071018: Mercator Telescope optical observations
  39. Swift autonomous slewing re-enabled
  40. GRB 071018: SARA observations
  41. GRB 071018: Swift-XRT observation
  42. GRB 071010B: Light Curve Break Confirmed
  43. GRB 071018, Swift-BAT refined analysis
  44. GRB 071010B: Suzaku WAM observation of the prompt emission
  45. GRB 071013: 3rd TLS Epoch - constraints on variability
  46. GRB 071010B: Optical observations of EST
  47. GRB 071013, Swift-BAT refined analysis
  48. GRB 071010C Swift-BAT detection of a burst
  49. GRB 071011: Swift-XRT refined analysis
  50. GRB 071011: MARGE Optical Limits
  51. GRB 071010B: Keck/LRIS Spectroscopy
  52. GRB 071011, Swift-BAT refined analysis
  53. GRB 071010B: Gemini Spectroscopic Observations
  54. GRB 071010B: Bright OT confirmed with TLS
  55. GRB 071011: Swift detection of a burst
  56. Konus-Wind observation of GRB 071010B
  57. GRB 071010B, Swift-BAT refined analysis
  58. GRB 071010A: bright NIR afterglow
  59. GRB 071006, Swift-BAT refined analysis
  60. GRB 071008, Swift-BAT refined analysis
  61. GRB 071010, Swift-BAT refined analysis
  62. GRB 071008: Swift detection of a burst
  63. GRB 071003: XRT refined analysis
  64. GRB070920A: MAGIC telescope GeV observation
  65. GRB 070810B: further XRT analysis
  66. GRB 071003 : Lulin R-band observations
  67. GRB 071003: Keck HIRES spectroscopy
  68. GRB 071003, Swift-BAT refined analysis
  69. GRB 071003: MARGE Observations
  70. GRB 070714B: host galaxy spectroscopic redshift
  71. GRB 071001: Swift-XRT Team refined analysis
  72. GRB 071001, Swift-BAT refined analysis
  73. GRB 070911, SMARTS optical/IR afterglow observations
  74. GRB070925: Swift-XRT Position
  75. GRB 070925: a long GRB detected by INTEGRAL
  76. Recent SGR1806-20 Activity
  77. GRB 070923, Swift-BAT refined analysis
  78. GRB 070920B: XRT observations
  79. GRB 070917: Suzaku/WAM observation of the prompt emission
  80. GRB 070920B, Swift-BAT refined analysis
  81. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  82. GRB 070920, Swift-BAT refined analysis
  83. Konus-Wind observation of GRB 070917
  84. Swift Status and XRT Calibration Uncertainties
  85. GRB 070917: Swift-XRT observations
  86. GRB 070917, Swift-BAT refined analysis
  87. GRB 070911: Suzaku WAM observation of the prompt emission
  88. GRB 070809: The Swift evidence for the SHB nature of this burst
  89. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  90. GRB 070913: Swift-BAT refined analysis
  91. GRB 070911: Swift XRT refined analysis
  92. GRB 070911, Swift-BAT refined analysis
  93. Intense burst from SGR 1806-20 detected on September 7
  94. Candidate Orphan GRB Optical Transient in IC 4779
  95. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  96. GRB 070824 - Combined SuperAGILE/IPN Localization
  97. GRB 070810B : Faulkes Telescope South Observations
  98. GRB 070810B: Keck spectroscopy of possible host galaxies
  99. GRB 070810B: XRT refined analysis
  100. GRB 070810B, Swift-BAT refined analysis

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