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"

42004 results found.

  1. GRB 131024B, Swift-BAT refined analysis
  2. GRB 131024B: Fermi GBM observation
  3. GRB 131024B: RATIR Optical and NIR Observations
  4. GRB 131024B: Swift/UVOT Upper Limits
  5. GRB 131024B : Xinglong TNT upper limit
  6. GRB 131024B: Swift-XRT refined Analysis
  7. Fermi GBM trigger 13121024.436 is not a GRB
  8. GRB 131024B: Nanshan optical upper limit
  9. GRB 131024A: Swift/UVOT Upper Limits
  10. GRB 131024A: GROND upper limits
  11. GRB 131024A: Swift-XRT refined Analysis
  12. GRB 131024B: Swift detection of a burst
  13. GRB 131024A, Swift-BAT refined analysis
  14. GRB 131024A: Skynet R-COP optical observations
  15. Konus-Wind observation of GRB 131011B
  16. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  17. GRB 131024A: Swift detection of a burst
  18. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  19. IPN Triangulation of GRB 131014A
  20. GRB 131018B: Swift/UVOT Upper Limits
  21. GRB 131018B: Swift-XRT observations
  22. GRB 131018B: Fermi GBM observation
  23. GRB 131018A: RATIR Optical and NIR Observations
  24. GRB 131018A: Swift/UVOT Upper Limits
  25. GRB 131018B: Fermi-LAT detection of a burst
  26. GRB 131018A: Swift-XRT refined Analysis
  27. GRB 131018A: KAIT Optical Upper Limit
  28. GRB 131018A, Swift-BAT refined analysis
  29. GRB 131018A: P60 Observations
  30. GRB 131014A: XRT position information
  31. GRB131018A, optical observations
  32. GRB 131018A: Swift detection of a burst
  33. GRB 131014A: Suzaku WAM observation of the prompt emission
  34. GRB 131014A: GROND observations
  35. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  36. Fermi GBM data availability during U.S. government shutdown
  37. GRB 131014A: Swift-XRT refined Analysis
  38. GRB 131011A: Swift/UVOT Upper Limits
  39. GRB 131014A: Swift/UVOT Upper Limits
  40. Fermi 403206457 / GRB 131011A: AAO optical observations
  41. GRB 131014A: RATIR Optical and NIR Observations
  42. GRB 131014A: Enhanced XRT position
  43. Konus-Wind observation of GRB 131014A
  44. GRB 131014A: NOT afterglow candidate
  45. GRB 131014A: Nanshan optical observations
  46. GRB 131014A: Swift detection of a possible X-ray afterglow
  47. GRB 131014A Tiled Swift observations
  48. GRB 131014A: Fermi-LAT detection
  49. GRB 131014A: Fermi GBM detection
  50. GRB 131011A: Fermi GBM detection
  51. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  52. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  53. GRB 131011A: GROND afterglow observations
  54. Fermi403206457: continued P60 observations and fading behavior
  55. Fermi403206457: Weihai optical upper limit
  56. Fermi403206457: NOT optical observations
  57. Fermi403206457: iPTF detection of a possible optical afterglow
  58. Trigger 574266 is not a Swift detection of a known source
  59. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  60. GRB 130831A: Continued RATIR Optical and NIR Observations
  61. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  62. GRB 131004A: MOSFIRE NIR imaging
  63. GRB 131004A: Correction to XRT refined analysis
  64. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  65. GRB 131004A, Swift-BAT refined analysis
  66. GRB 131004A: Fermi GBM observation
  67. GRB 131004A: CARMA 93 GHz upper limit
  68. GRB 131004A: Swift/UVOT Detection
  69. GRB 131004A: RATIR Optical and NIR Upper Limits
  70. GRB 131004A: Swift-XRT refined Analysis
  71. GRB131004A: TNG Redshift confirmation
  72. GRB 131004A: GROND observations of the afterglow
  73. GRB131004A: Magellan Redshift
  74. GRB 131004A: Liverpool Telescope optical afterglow observations
  75. GRB 131004A: TNG optical afterglow confirmation
  76. GRB 131004A: optical afterglow from the NOT
  77. GRB 131004A: Swift detection of a burst (may be short)
  78. GRB 131002A, Swift-BAT refined analysis
  79. GRB 130925A: 3mm observations with CARMA
  80. GRB 131002A: Fermi GBM observation
  81. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  82. GRB 131002B, Swift-BAT refined analysis
  83. GRB 131002B: GROND upper limits
  84. GRB 131002B: Swift-XRT Refined Analysis
  85. GRB 131002B: Swift/UVOT Upper Limits
  86. GRB 131002A: Swift/UVOT Detection
  87. GRB 131001A, Swift-BAT refined analysis
  88. GRB 131002A: Swift-XRT refined Analysis
  89. GRB 131002A: ISON-NM optical observations
  90. Swift J1242.9-3530, Swift-BAT refined analysis
  91. GRB 131001A: Swift UVOT and XRT Upper Limits
  92. NuSTAR observations of GRB 130925A
  93. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  94. GRB 131002B: Swift detection of a burst
  95. GRB 131002A: Swift detection of a burst
  96. GRB 131001A detected in ground analysis of Swift-BAT data
  97. GRB 130925A: continuing Swift/XRT monitoring
  98. Swift Operations in the event of a US Government shutdown
  99. IPN Observations of GRB 130925A
  100. US Government shutdown may impact GRB operation of GCN

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