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"

38670 results found.

  1. GRB 070917: Confirmation of the X-ray afterglow
  2. GRB 070920b: LCO optical observations
  3. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  4. GRB 070920B: Swift detection of a burst
  5. GRB 070920: Swift detection of a burst
  6. SGR1806-20: Swift-BAT detection of enhanced activity
  7. GRB070917: Confirmation of optical afterglow
  8. GRB920925C: search for host galaxy
  9. GRB070917: optical observations
  10. GRB 070917: P60 Observations
  11. Konus-Wind observation of GRB 070917
  12. Swift Status and XRT Calibration Uncertainties
  13. GRB 070917: Swift-XRT observations
  14. GRB 070917: KAIT optical limits
  15. GRB 070917: MITSuME Akeno Ic upper limit
  16. GRB 070917: R band observations
  17. GRB 070917: Swift detection of a bright burst
  18. GRB 070911: Suzaku WAM observation of the prompt emission
  19. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  20. GRB 070809: The Swift evidence for the SHB nature of this burst
  21. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  22. GRB 070913: Corrected BAT position
  23. GRB 070913: SMARTS optical/IR observations
  24. GRB 070913: Swift detection of a burst
  25. Swift-BAT Notices back to autonomous real-time distribution
  26. GRB 070911: PAIRITEL IR Observations
  27. GRB 070911: Swift XRT refined analysis
  28. GRB 070911: Swift detection of a burst
  29. IPN search for a GRB associated with TAROT transient on August 31
  30. Intense burst from SGR 1806-20 detected on September 7
  31. GRB 070809: Confirmation of optical transient
  32. Observations of possible TAROT GRB transient near IC 4779
  33. Candidate Orphan GRB Optical Transient in IC 4779
  34. Las Campanas observations of possible TAROT GRB transient near IC
  35. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  36. Konus-Wind observation of GRB 070824
  37. GRB 070824 - Combined SuperAGILE/IPN Localization
  38. Konus-Wind observation of very bright GRB 070821
  39. GRB 070731: Swift/UVOT Upper Limit
  40. IPN Localization of GRB 070821 (long, very bright)
  41. GRB 070805: UVOT afterglow candidate retraction
  42. GRB070810b: optical candidate
  43. GRB 070810A: ROTSE-III Refined Analysis
  44. Swift observatory off line
  45. GRB 061110A: redshift confirmed
  46. GRB 070810B : Faulkes Telescope South Observations
  47. GRB 070810A: Continued Keck Imaging
  48. GRB 070810B: Keck spectroscopy of possible host galaxies
  49. GRB070810B: Swift/UVOT Upper Limits
  50. GRB 070810B: XRT refined analysis
  51. GRB 070809: Swift/UVOT Corrected Photometry
  52. Swift Trigger 287421: False trigger due to star tracker loss
  53. GRB 070810B: Xinglong TNT optical Upper Limit
  54. GRB070810B: Optical observations with KANATA
  55. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  56. GRB 070809: Swift/UVOT Upper Limits
  57. GRB 070810B: Swift detection of a short burst
  58. VLA upper limit on the short hard burst GRB 070729
  59. GRB 070810: Keck redshift and photometry
  60. No radio detection in superAGILE burst 070724B
  61. GRB 070809: Keck Imaging
  62. GRB 070810: Swift-XRT Team Refined Analysis
  63. GRB 070809: Swift-XRT refined analysis
  64. GRB 070810: enhanced Swift-XRT position
  65. GRB 070810: Swift/UVOT Optical Counterpart
  66. GRB 070810: ROTSE-III Detection of Optical Counterpart
  67. GRB 070810: Swift detection of a burst
  68. GRB 070808: Swift/UVOT upper limits
  69. GRB 070809: ROTSE-III Optical Limits
  70. GRB 070809: Swift detection of a short burst
  71. GRB 070808 : Faulkes Telescope South Observations
  72. GCN Swift XRT update position notices and enhanced position circulars
  73. GRB 070808: Swift XRT refined analysis
  74. GRB 070808: Xinglong TNT optical Upper Limit
  75. GRB070808: Optical observations with KANATA
  76. GRB070808 - SDSS Pre-Burst Observations
  77. GRB 070808: ROTSE-III Optical Limits
  78. GRB 070808: Swift detection of a burst
  79. GRB070805 XRT and UVOT afterglow candidate
  80. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  81. GRB070612A: Radio upper limit from GMRT
  82. Swift/UVOT observations of GRB070805
  83. GRB 070805: Swift XRT initial analysis.
  84. GRB 070805: Swift/UVOT initial analysis
  85. GRB 070805: Swift detection of a burst
  86. UVOT observations of SAXJ1810.8-2609
  87. Swift detection of a outburst from SAX J1810.8-2609
  88. VLA non-detection of GRB 070721B
  89. GRB 070802: REM optical observations
  90. GRB 070724B: Swift-XRT afterglow confirmation
  91. GRB 070802: Swift-XRT refined analysis
  92. GRB070802: Swift/UVOT upper limits
  93. GRB 070802: Confirmation of the optical afterglow
  94. GRB 070802: VLT redshift
  95. GRB 070802: refined Swift XRT position
  96. GRB 070802: V-band detection of the candidate afterglow
  97. GRB 070802: LCO I-band candidate
  98. GRB 070802: GROND J band candidate
  99. GRB 070802: Swift detection of a burst
  100. Konus-A observation of GRB 070729

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