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"

19668 results found.

  1. GRB 080212: Swift detection of a burst
  2. GRB 080210: Swift/UVOT Refined Analysis
  3. GRB 080210, Swift-BAT refined analysis
  4. GRB 080210: Super-LOTIS observations
  5. GRB 080210: Swift-XRT Refined Analysis
  6. GRB 080210: Enhanced Swift-XRT position
  7. GRB 080210: GOND detection in all bands and redshift upper limit
  8. GRB080210 - SDSS Pre-Burst Observations
  9. GRB 080210: Swift detection of a burst with optical afterglow
  10. GRB 080210: TAROT La Silla observatory optical detection
  11. GRB 080207: GROND upper limits
  12. GRB 080207, Swift-BAT refined analysis
  13. Swift detection of AX J1749.1-2639
  14. GRB 080207, Swift-BAT refined analysis
  15. Swift Trigger 302777 is not a GRB
  16. GRB080207: Swift/UVOT refined analysis
  17. GRB 080207: TAROT Calern observatory optical observations
  18. GRB 080207: Swift-XRT Refined Analysis
  19. GRB 080207: Enhanced Swift-XRT position
  20. GRB 080207: Swift detection of a burst
  21. GRB 080205 optical upper limit
  22. VLA radio upper limit on GRB 080205
  23. GRB 080205, Swift-BAT refined analysis
  24. IPN localization of very hard GRB 080204
  25. GRB 080205: Swift XRT refined analysis
  26. GRB 080205: OA evolution from KAIT observations
  27. GRB 080205: Swift/UVOT observations
  28. GRB 080205: Enhanced Swift-XRT position
  29. GRB 080205: KAIT OA detection
  30. GRB 080205: Swift detection of a burst
  31. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  32. GRB 080130: Swift-BAT refined analysis
  33. GRB 080130: further Swift XRT observations confirm fading source
  34. GRB 080129: Swift/UVOT Refined Upper Limits
  35. Swift/UVOT observations of GRB080130
  36. GRB 080130(?): Swift XRT observation
  37. GRB 080129: Swift-XRT refined analysis
  38. GRB 080129: KAIT optical limits
  39. GRB 080129, Swift-BAT refined analysis
  40. GRB 080129: TAROT La Silla observatory optical observations
  41. GRB 080129: Gemini-South photometry
  42. GRB 080129: GROND detection in all bands, and fading
  43. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  44. GRB 080129: Enhanced Swift-XRT position
  45. GRB 080129: Swift XRT position
  46. GRB 080129 (?): UVOT Upper Limits
  47. GRB 080129 (?): Swift detection of a possible burst
  48. A new website of high-level data products for Swift GRBs
  49. GRB 080121: Upper limit on X-ray afterglow
  50. GRB 080123 : Suzaku WAM observation of the prompt emission
  51. Swift trigger(=301779) is not a GRB
  52. GRB 080121: Swift/UVOT upper limits
  53. SNe 2008D and 2007uy: Chandra Detections
  54. GRB 080121: Enhanced Swift-XRT position
  55. Two non-burst Swift SubThreshold triggers
  56. IPN triangulation of GRB080122
  57. GRB 080121: Nearby SDSS galaxies
  58. GRB 080121: Swift-BAT detection of a very weak, short burst
  59. GRB 080123: Swift-XRT refined analysis
  60. GRB 080123: Swift/UVOT refined analysis
  61. GRB 080123, Swift-BAT refined analysis
  62. GRB 080123: Enhanced Swift-XRT position
  63. GRB 080123: Swift detection of a short burst
  64. VLA radio upper limit on GRB 080120
  65. GRB 080120: Swift-XRT refined analysis
  66. UVOT detection of GRB080120
  67. GRB 080120: GROND detection
  68. GRB080120: Swift XRT position
  69. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  70. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  71. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  72. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  73. XRF 080109 in NGC2770: Detectable Superluminal Motion
  74. XRF in NGC 2770: Search for X-ray periodicity
  75. Refined Swift-XRT analysis of the transient in NGC 2770
  76. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  77. Swift UVOT Observations of the X-ray transient in NGC 2770
  78. Early OT detection of XRF in NGC 2770 in Asiago frames
  79. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  80. GRB 071227: Suzaku WAM observation of the prompt emission
  81. Further Swift-BAT analysis of GRB 071227
  82. Konus-Wind observation of GRB 071227
  83. GRB 071227: Swift-XRT refined analysis
  84. GRB071227: Swift/UVOT refined analysis
  85. Swift-BAT refined analysis of short GRB 071227
  86. GRB 071227: Swift detection of a burst
  87. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  88. Swift-BAT trigger 298308 is not a GRB
  89. GRB 071208?: Swift detection of a possible burst
  90. GRB 071129, Swift-BAT refined analysis
  91. GRB 071129: Swift detection of a burst
  92. GRB 071126: Enhanced Swift-XRT position
  93. VLA radio detection of GRB 071122
  94. GRB071122: Swift/UVOT Observations
  95. GRB 071122, Swift-BAT refined analysis
  96. GRB 071122 Swift XRT position update sent in error.
  97. GRB 071122 Swift-XRT refined analysis
  98. GRB 071122: ROTSE-III Optical Limits
  99. GRB 071122: Swift detection of a burst
  100. Swift/UVOT observations of GRB071118

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