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"

32797 results found.

  1. GRB 071010A: bright NIR afterglow
  2. GRB 071006, Swift-BAT refined analysis
  3. GRB071008: optical observations
  4. GRB 071010B possible optical transient
  5. GRB 071010A: Keck/LRIS Photometry
  6. GRB 071010: Swift-XRT observation
  7. GRB 071008, Swift-BAT refined analysis
  8. GRB 071010, Swift-BAT refined analysis
  9. Konus-Wind observation of GRB 071006
  10. GRB071008: Swift-XRT observation
  11. GRB 071010 REM NIR observations
  12. GRB 071010: Keck/LRIS Spectroscopy
  13. GRB 071010: Rapid PROMPT Detections
  14. GRB 071010: Keck Observations of the Afterglow
  15. GRB071008: IAC80 observation
  16. GRB 071003: XRT refined analysis
  17. GRB070920A: MAGIC telescope GeV observation
  18. Radio detection of GRB 071003 with the VLA
  19. GRB 070810B: further XRT analysis
  20. GRB 071003: VLT spectroscopy
  21. GRB 071003: Keck spectroscopy
  22. Konus-Wind observation of GRB 071003
  23. GRB071003: Faulkes Telescope North observations
  24. GRB 071003: Possible rebrightening
  25. GRB 071003 : Lulin R-band observations
  26. GRB 071003: Swift XRT position
  27. GRB 071003: OA power-law decay indices from KAIT
  28. GRB 071003: Keck HIRES spectroscopy
  29. GRB 071003, Swift-BAT refined analysis
  30. GRB 071003: MARGE Observations
  31. GRB 071003 Optical observations
  32. GRB 071003: P60 Confirmation of Optical Afterglow
  33. GRB 071003: KAIT optical afterglow observations
  34. GRB 070714B: host galaxy spectroscopic redshift
  35. GRB 071001: Swift-XRT Team refined analysis
  36. GRB 071001, Swift-BAT refined analysis
  37. Faulkes Telescope South observations of GRB 071001
  38. VLA observation of GRB 070923
  39. Disregard the Swift-XRT Notices today
  40. GRB 070911, SMARTS optical/IR afterglow observations
  41. GRB070925: Swift-XRT Afterglow confirmation
  42. GRB 070925: Gemini South Imaging
  43. GRB070925: Swift-XRT Position
  44. Update on Swift Status
  45. GRB 070920B: ROTSE-III Early Optical Limits
  46. Recent SGR1806-20 Activity
  47. GRB 070923, Swift-BAT refined analysis
  48. GRB 070920B: XRT observations
  49. GRB 070923: Galaxies within BAT localization
  50. GRB 070917: Suzaku/WAM observation of the prompt emission
  51. INTEGRAL ToO observations of SGR1806-20
  52. GRB 070920b, SMARTS optical observation
  53. GRB 070917: Confirmation of the X-ray afterglow
  54. GRB 070920b: LCO optical observations
  55. GRB 070920B, Swift-BAT refined analysis
  56. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  57. GRB 070920, Swift-BAT refined analysis
  58. SGR1806-20: Swift-BAT detection of enhanced activity
  59. GRB070917: Confirmation of optical afterglow
  60. GRB920925C: search for host galaxy
  61. GRB070917: optical observations
  62. GRB 070917: P60 Observations
  63. Konus-Wind observation of GRB 070917
  64. Swift Status and XRT Calibration Uncertainties
  65. GRB 070917: Swift-XRT observations
  66. GRB 070917: KAIT optical limits
  67. GRB 070917: MITSuME Akeno Ic upper limit
  68. GRB 070917: R band observations
  69. GRB 070917, Swift-BAT refined analysis
  70. GRB 070911: Suzaku WAM observation of the prompt emission
  71. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  72. GRB 070809: The Swift evidence for the SHB nature of this burst
  73. GRB 070913: Swift-BAT refined analysis
  74. GRB 070913: Corrected BAT position
  75. GRB 070913: SMARTS optical/IR observations
  76. GRB 070911: PAIRITEL IR Observations
  77. GRB 070911: Swift XRT refined analysis
  78. GRB 070911, Swift-BAT refined analysis
  79. IPN search for a GRB associated with TAROT transient on August 31
  80. Intense burst from SGR 1806-20 detected on September 7
  81. GRB 070809: Confirmation of optical transient
  82. Observations of possible TAROT GRB transient near IC 4779
  83. GRB 070810b: Image Subtraction of Multiple Keck Observations
  84. Las Campanas observations of possible TAROT GRB transient near IC
  85. Konus-Wind observation of GRB 070824
  86. Konus-Wind observation of very bright GRB 070821
  87. GRB 070731: Swift/UVOT Upper Limit
  88. GRB 070805: UVOT afterglow candidate retraction
  89. GRB070810b: optical candidate
  90. GRB 070810A: ROTSE-III Refined Analysis
  91. GRB 061110A: redshift confirmed
  92. GRB 070810B : Faulkes Telescope South Observations
  93. GRB 070810A: Continued Keck Imaging
  94. GRB 070810B: Keck spectroscopy of possible host galaxies
  95. GRB070810B: Swift/UVOT Upper Limits
  96. GRB 070810B: XRT refined analysis
  97. GRB 070810B, Swift-BAT refined analysis
  98. GRB 070809: Swift/UVOT Corrected Photometry
  99. Swift Trigger 287421: False trigger due to star tracker loss
  100. GRB 070810A: 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