Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

27155 results found.

  1. GRB 071003: KAIT optical afterglow observations
  2. GRB 071003: Swift detection of a bright burst
  3. GRB 071001: Swift-XRT Team refined analysis
  4. GRB 071001, Swift-BAT refined analysis
  5. Faulkes Telescope South observations of GRB 071001
  6. GRB 071001: Swift detection of a burst
  7. GRB070925: Swift-XRT Position
  8. Update on Swift Status
  9. GRB 070920B: ROTSE-III Early Optical Limits
  10. Recent SGR1806-20 Activity
  11. GRB 070923, Swift-BAT refined analysis
  12. GRB 070920B: XRT observations
  13. GRB 070923: Swift detection of a short hard burst
  14. GRB 070917: Suzaku/WAM observation of the prompt emission
  15. GRB 070920B: TAROT La Silla observatory optical observations
  16. GRB 070920B, Swift-BAT refined analysis
  17. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  18. GRB 070920B: Swift detection of a burst
  19. GRB 070920, Swift-BAT refined analysis
  20. GRB 070920: TAROT Calern observatory optical observations
  21. GRB 070920: Swift detection of a burst
  22. SGR1806-20: Swift-BAT detection of enhanced activity
  23. GRB 070917: P60 Observations
  24. Konus-Wind observation of GRB 070917
  25. GRB 070917: Swift-XRT observations
  26. GRB 070917: KAIT optical limits
  27. GRB 070917: MITSuME Akeno Ic upper limit
  28. GRB 070917, Swift-BAT refined analysis
  29. GRB 070917: Swift detection of a bright burst
  30. GRB 070911: Suzaku WAM observation of the prompt emission
  31. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  32. GRB 070913: Swift-BAT refined analysis
  33. GRB 070913: TAROT La Silla observatory optical observations
  34. GRB 070913: Swift detection of a burst
  35. GRB 070911: Swift XRT refined analysis
  36. GRB 070911, Swift-BAT refined analysis
  37. GRB 070911: Swift detection of a burst
  38. Intense burst from SGR 1806-20 detected on September 7
  39. GRB 070824 - Combined SuperAGILE/IPN Localization
  40. GRB 070731: Swift/UVOT Upper Limit
  41. GRB 070805: UVOT afterglow candidate retraction
  42. GRB 070810A: ROTSE-III Refined Analysis
  43. GRB 070810B : Faulkes Telescope South Observations
  44. GRB070810B: Swift/UVOT Upper Limits
  45. GRB 070810B: XRT refined analysis
  46. GRB 070810B, Swift-BAT refined analysis
  47. GRB 070809: Swift/UVOT Corrected Photometry
  48. Swift Trigger 287421: False trigger due to star tracker loss
  49. GRB 070810A: Swift-BAT refined analysis
  50. GRB 070809: Swift/UVOT Upper Limits
  51. GRB 070810B: Swift detection of a short burst
  52. GRB 070810: Swift-XRT Team Refined Analysis
  53. GRB 070810: Swift/UVOT Optical Counterpart
  54. GRB 070810: ROTSE-III Detection of Optical Counterpart
  55. GRB 070810: Swift detection of a burst
  56. GRB 070809, Swift-BAT refined analysis
  57. GRB 070808: Swift/UVOT upper limits
  58. GRB 070809: ROTSE-III Optical Limits
  59. GRB 070809: Swift detection of a short burst
  60. GRB 070808 : Faulkes Telescope South Observations
  61. GRB 070808: Swift XRT refined analysis
  62. GRB 070808, Swift-BAT refined analysis
  63. GRB070808 - SDSS Pre-Burst Observations
  64. GRB 070808: ROTSE-III Optical Limits
  65. GRB 070808: Swift detection of a burst
  66. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  67. Swift/UVOT observations of GRB070805
  68. GRB 070805, Swift-BAT refined analysis
  69. GRB 070805: Swift XRT initial analysis.
  70. GRB 070805: Swift/UVOT initial analysis
  71. GRB 070805: Swift detection of a burst
  72. UVOT observations of SAXJ1810.8-2609
  73. Swift detection of a outburst from SAX J1810.8-2609
  74. GRB070802: Swift/UVOT upper limits
  75. GRB 070802, Swift-BAT refined analysis
  76. GRB 070802: GROND J band candidate
  77. GRB 070802: Swift detection of a burst
  78. GRB 070731, Swift-BAT refined analysis
  79. Konus-A observation of GRB 070729
  80. Swift/UVOT detection of GRB070714B
  81. Intense burst from SGR 1806-20 detected on July 27
  82. GRB070729: Swift/UVOT upper limits
  83. GRB 070729, Swift-BAT refined analysis
  84. GRB 070729: Swift detection of a short hard burst
  85. GRB 070724B: Swift/UVOT Upper limits
  86. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  87. GRB 070721A: optical observations
  88. GRB 070724B: Suzaku WAM observation of the prompt emission
  89. GRB 070724B: Analysis of AGILE gamma-ray data
  90. GRB 070724B: Swift-XRT afterglow candidates
  91. GRB 070724: optical observations
  92. Swift/UVOT refined analysis of GRB070724
  93. GRB 070724: Swift-XRT Team refined analysis
  94. GRB 070724, Swift-BAT refined analysis of a short burst
  95. GRB 070721B: further observations and analysis
  96. GRB 070724: Swift detection of a burst
  97. Swift/UVOT observations of GRB070721B optical afterglow.
  98. GRB 070721B, Further Swift-BAT refined analysis
  99. Swift/UVOT Observations of GRB070721A
  100. GRB 070721B : Faulkes Telescope South 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