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"

32763 results found.

  1. GRB 061121: Faulkes Telescope North Optical Observation
  2. GRB061121: Spectroscopic Redshift
  3. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  4. GRB 060605: NIR Observations
  5. GRB 050915B: optical afterglow
  6. GRB 060111B: Swift UVOT Refined Magnitudes
  7. GRB061110A: Correction to GCN5817
  8. GRB 061110A: refined R-band analysis
  9. GRB 061110B: NIR Observations
  10. Swift/UVOT Upper Limits for GRB061110b
  11. Swift/UVOT Upper Limits for GRB061110a
  12. GRB 061110B: Swift XRT refined analysis
  13. GRB 061110B, Swift-BAT refined analysis
  14. GRB 061110B: VLT redshift
  15. GRB 061110B: NOT optical observations
  16. GRB 061110A: Swift XRT refined analysis
  17. GRB 061110B: Swift/XRT position
  18. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  19. GRB 061110A, Swift-BAT refined analysis
  20. GRB 061110: ROTSE-III Optical Limits
  21. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  22. GRB 061109: optical observation
  23. GRB061028: MAGIC telescope GeV observation
  24. GRB 061007: Third Epoch ATCA Radio Observations
  25. GRB061019: second epoch CrAO observations
  26. GRB 061028: Swift/XRT Astrometry Correction
  27. GRB 061102: Swift/UVOT Magnitude Upper Limits
  28. GRB 061102, XRT refined analysis
  29. GRB 061004: Further VLT/NTT observations
  30. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  31. GRB061102B: Super-LOTIS observations
  32. GRB 061028: Optical R passband observations
  33. GRB 061102, Swift-BAT refined analysis
  34. GRB 061028: VLA Observation
  35. GRB 061004: Swift/XRT Astrometry Correction
  36. GRB 060801: Swift/XRT Astrometry Correction
  37. GRB 061028: Futher P200 Observations
  38. GRB 061028: MDM Observations
  39. GRB 061028: P200 Observations
  40. GRB 061028: SARA upper limit
  41. GRB 061028: z band imaging
  42. GRB061028: XRT refined analysis
  43. GRB 061028: Swift/UVOT Observations
  44. GRB 061028, Swift-BAT refined analysis
  45. GRB 061027, Swift refined analysis of a possible burst
  46. GRB061025: ROTSE-III Confirmation of Optical Counterpart
  47. GRB061025: Swift XRT refined analysis
  48. GRB061025: Swift/UVOT observations
  49. GRB 061019: MITSuME upper limits
  50. GRB 061025: REM observations
  51. GRB 061025: Gemini-S observations
  52. GRB061025: Swift XRT position
  53. GRB 061025: ROTSE-III Optical Limits
  54. Swift XRT boresight update
  55. GRB 061021, Swift-BAT Lag analysis
  56. Konus-Wind observation of GRB 061021
  57. GRB 061021 - VLT spectrum without lines
  58. GRB 061021: Swift-XRT refined analysis
  59. GRB 061021: Swift/UVOT Observation
  60. GRB 061021, Swift-BAT refined analysis
  61. GRB 061019: Super-LOTIS upper limit
  62. GRB060904b: optical observations
  63. GRB061019: optical observations
  64. GRB061019: optical observations
  65. GRB 061019: SARA upper limit
  66. GRB 060930: MARGE Optical Limits
  67. GRB 061019: Swift/UVOT upper limit
  68. GRB 061019: SMARTS afterglow confirmation
  69. GRB061019: Swift XRT refined analysis
  70. GRB 061019, Swift-BAT refined analysis
  71. GRB 061019: REM K-band candidate afterglow
  72. GRB061019: Swift/XRT position
  73. GRB 060825: GORT Observations
  74. GRB 061007: Second Epoch ATCA Radio Observations
  75. GRB 061007: RHESSI Spectral Fit
  76. GRB 061007: Suzaku/WAM observation of the prompt emission
  77. GRB 061006: astrometry-corrected XRT position
  78. Konus-Wind observation of GRB 061007
  79. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  80. GRB 061007: ATCA Radio Observations
  81. GRB061007: Swift UVOT followup observations
  82. GRB 061006: optical afterglow
  83. GRB 061007: OA fading and VLT redshift
  84. GRB 061007: Magellan Spectroscopy
  85. GRB 061007: Correction to GCN 5712
  86. GRB 061007: Swift-BAT refined analysis
  87. GRB 061007: Swift XRT refined analysis
  88. GRB 061006: Swift/UVOT optical observations
  89. Konus-Wind observation of the short hard GRB 061006
  90. GRB 061007 - FTS early brightening and power law decay
  91. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  92. GRB 061007: ROTSE-III Detection of Optical Counterpart
  93. GRB 061006: VLT observation
  94. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  95. GRB 061006: Swift-XRT Team Refined Analysis
  96. GRB061006 (Swift 232585) might be a short-hard GRB
  97. GRB061006: Faulkes Telescope South Observations
  98. GRB 061004: Optical afterglow candidate and redshift
  99. GRB 061004: Las Campanas Optical/NIR Observations
  100. GRB061004: Swift/UVOT optical observations

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