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"

45774 results found.

  1. GRB 131105A: Swift/UVOT Upper Limits
  2. GRB 131024B: Suzaku WAM observation of the prompt emission
  3. Konus-Wind observation of GRB 131105A
  4. GRB 131103A: VLT/X-shooter redshift
  5. GRB 131105A: VLT/X-shooter redshift
  6. GRB 131105A: TAROT La Silla observatory optical observations
  7. GRB 131105A: Enhanced Swift-XRT position
  8. GRB 131105A: VLT/X-shooter optical afterglow candidate
  9. GRB 131105A: Swift detection of a burst
  10. GRB 131103A: NOT and VLT observations
  11. GRB 131030A: Continued RATIR Optical and NIR Observations
  12. GRB 131103A: Swift/UVOT Detection
  13. GRB 131103A: Enhanced Swift-XRT position
  14. GRB 131103A: Swift-XRT refined Analysis
  15. GRB 131103A: Swift detection of a burst
  16. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  17. GRB131031A: RATIR Optical and NIR Observations
  18. GRB 131018B: RATIR Optical/NIR Observations
  19. GRB 131030A: Continued RATIR Optical and NIR Observations
  20. GRB 131030A: the 2nd epoch of SAO RAS observations
  21. GRB 131031A: Fermi GBM detection
  22. GRB 131031A: Swift/UVOT Upper Limits
  23. LOAO B,R Observation of GRB131030A
  24. GRB 131018B: Further Swift-XRT observations.
  25. GRB 131030A - RoboPol optical afterglow polarimetry
  26. GRB 131031A: MASTER optical observation
  27. Konus-Wind observation of GRB 131031A
  28. GRB 131030A: Bassano Bresciano Observatory optical observations
  29. GRB 131031A: 1.23m CAHA afterglow candidate
  30. GRB131030A : xinglong TNT optical observation
  31. GRB 131031A: Swift-XRT observations
  32. GRB 131030A: P60 observations
  33. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  34. GRB 131031A found in ground analysis of BAT data
  35. GRB 131030A: RATIR Optical and NIR Observations
  36. GRB 131030A: TAROT La Silla observatory optical observations
  37. GRB 131030A: Swift-XRT refined Analysis
  38. GRB 131030A: Enhanced Swift-XRT position
  39. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  40. GRB 131030A: Swift/UVOT Detection
  41. Konus-Wind observation of GRB 131030A
  42. GRB 131030A: SAO RAS optical observations
  43. GRB 131030A: 1.23m CAHA BVRI-band observations
  44. GRB 131030A: D50+BART detection and light curve optical decay
  45. GRB 131029A: Nanshan optical observations
  46. GRB 131030A: Spectroscopy from 10.4m GTC
  47. GRB 131030A: NOT redshift
  48. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  49. GRB 131030A: MASTER optical observation
  50. GRB 131029A: Swift-XRT follow up
  51. GRB 131030A: Watcher OT detection
  52. GRB 131030A: Swift detection of a burst with an optical counterpart
  53. GRB 131029A: Fermi GBM observation
  54. GRB 131029A Tiled Swift observations
  55. GRB 131029A: Fermi-LAT detection of a burst
  56. Konus-Wind observation of GRB 131028A
  57. IPN Triangulation of GRB 131028A (long/bright)
  58. GRB 131028A: Fermi GBM detection
  59. GRB 131011A: ATCA 34GHz upper limit
  60. Swift 575905/GRB 131026A: optical observations
  61. Swift-BAT Trigger 575905 is probably not a real source
  62. GRB 131024B: AAO optical upper limit
  63. GRB 131024B: Mondy optical upper limits
  64. GRB 131024B: MASTER prompt optical observation
  65. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  66. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  67. Swift Trigger 575905: ROTSE-III Optical Limits
  68. Swift Trigger 575905: KAIT Optical Upper Limit
  69. GRB 131026A: TAROT La Silla observatory optical observations
  70. Swift Trigger 575905: a possible GRB
  71. GRB 131024B, Swift-BAT refined analysis
  72. GRB 131024B: Fermi GBM observation
  73. GRB 131024B: RATIR Optical and NIR Observations
  74. GRB 131024B: Swift/UVOT Upper Limits
  75. GRB 131024B : Xinglong TNT upper limit
  76. GRB 131024B: Swift-XRT refined Analysis
  77. Fermi GBM trigger 13121024.436 is not a GRB
  78. GRB 131024B: Nanshan optical upper limit
  79. GRB 131024A: Swift/UVOT Upper Limits
  80. GRB 131024B: Enhanced Swift-XRT position
  81. GRB 131024A: GROND upper limits
  82. GRB 131024A: Swift-XRT refined Analysis
  83. GRB 131024B: Swift detection of a burst
  84. GRB 131024A, Swift-BAT refined analysis
  85. GRB 131024A: Skynet R-COP optical observations
  86. Konus-Wind observation of GRB 131011B
  87. GRB 131024A: Enhanced Swift-XRT position
  88. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  89. GRB 131024A: Swift detection of a burst
  90. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  91. IPN Triangulation of GRB 131014A
  92. GRB 131018B: Swift/UVOT Upper Limits
  93. GRB 131018B: Swift-XRT observations
  94. GRB 131018B: Fermi GBM observation
  95. GRB 131018A: RATIR Optical and NIR Observations
  96. GRB 131018A: Swift/UVOT Upper Limits
  97. GRB 131018B: Fermi-LAT detection of a burst
  98. GRB 131018A: Swift-XRT refined Analysis
  99. GRB 131018A: KAIT Optical Upper Limit
  100. GRB 131018A, 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