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"

19664 results found.

  1. GRB 081024B: new Swift-XRT observations
  2. Radio observation of GRB 080229b with ATCA
  3. GRB 081029: UVOT Detection of the Optical Afterglow
  4. GRB 081029: Swift-BAT refined analysis
  5. GRB081029: Swift XRT refined analysis
  6. GRB 081029: Enhanced Swift-XRT position
  7. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  8. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  9. GRB 081029: ROTSE-III Detection of Optical Counterpart
  10. GRB 081029: Swift detection of a burst
  11. GRB081028: UVOT detection of a brightening afterglow
  12. Swift UVOT observations of GRB081028
  13. GRB 081028: Swift-XRT refined analysis
  14. GRB 081028, Swift-BAT refined analysis
  15. GRB 081028: Enhanced Swift-XRT position
  16. GRB 081028: TAROT Calern observatory optical observations
  17. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  18. GRB 081028: Swift detection of a burst
  19. GRB 081024: No radio detection with the VLA
  20. GRB081025: RTT150 optical observations
  21. GRB 081024B: Swift-XRT further observations
  22. GRB 081025 BAT refined analysis
  23. Swift UVOT observations of GRB081025
  24. Swift UVOT observations of GRB081024B
  25. Konus-Wind observation of GRB 081025
  26. GRB 081025: Swift-XRT position
  27. GRB 081024B: Swift-XRT observations
  28. GRB 081025: Burst detection from Swift-BAT slew data
  29. Swift UVOT observations of GRB 081024
  30. GRB 081024: Swift-XRT refined analysis
  31. GRB 081024, Swift-BAT refined analysis
  32. GRB 081024: Enhanced Swift-XRT position
  33. GRB 081024: KAIT Optical Limits
  34. GRB 081024: Early Super-LOTIS Observations
  35. GRB 081024A: ROTSE-III Optical Limits
  36. GRB 081024: Swift detection of a burst
  37. GRB 081022, Swift-BAT refined analysis
  38. GRB 081016A: Swift-XRT refined analysis
  39. GRB 081022: Swift detection of a burst
  40. GRB 081012: Swift-XRT Refined Analysis
  41. Swift trigger 332287 is not a GRB
  42. Swift detection of a possible burst (trigger 332287)
  43. GRB 081012 - Enhanced Swift XRT position
  44. GRB 081017, Swift-BAT refined analysis
  45. GRB 081017: Swift detection of a burst
  46. GRB 081016B, Swift-BAT refined analysis
  47. GRB 081016B: Swift/UVOT Upper Limits
  48. GRB 081011: Swift XRT refined analysis
  49. GRB 081016B: Swift-XRT Team refined Analysis
  50. GRB 081016B: Enhanced Swift-XRT position
  51. GRB 081016B: ROTSE-III Optical Limits
  52. GRB 081016B: Swift detection of a burst
  53. GRB 081011: Enhanced Swift-XRT position
  54. GRB 081016: Swift-XRT candidate afterglow detection
  55. Swift detection of flare on CC Eri
  56. Trigger 331721 Due to Swift startracker loss-of-lock
  57. Detection of flare star Algol in Swift-BAT slew data
  58. Swift-BAT triggered on the flare star Algol
  59. GRB 081012: Fermi GBM detection
  60. GRB 081007 and GRB 081007B: Fermi GBM detection
  61. GRB 081012: Swift/UVOT analysis of initial observations
  62. GRB 081012: Swift/XRT detection
  63. GRB 081012, Swift-BAT refined analysis
  64. GRB 081012: ROTSE-III Optical Limits
  65. GRB 081012: Swift detection of a burst
  66. Revised table for GRB 081011 UVOT detections
  67. GRB081011: UVOT detection of an optical afterglow
  68. GRB 081011: Swift/XRT detection
  69. GRB 081011, Swift-BAT refined analysis
  70. GRB 081011: Swift detection of a burst
  71. GRB 081008, Swift-BAT refined analysis
  72. GRB 081008: Swift-XRT Refined Analysis
  73. GRB081008: Swift/UVOT observations
  74. GRB 081008: Enhanced Swift-XRT position
  75. GRB 081008: Swift detection of a burst with optical afterglow
  76. GRB 081008: ROTSE-III Detection of Optical Counterpart
  77. GRB081007: Swift/UVOT Observations
  78. GRB 081007, Swift-BAT refined analysis
  79. GRB 081007: Early RAPTOR measurements of optical counterpart
  80. GRB 081007: Swift-XRT Team refined analysis
  81. GRB 081007: Enhanced Swift-XRT position
  82. GRB 081007: Swift detection of a burst with optical afterglow
  83. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  84. GRB 081003B: Swift-XRT upper limit
  85. GRB 081003A: OSN optical observations
  86. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  87. GRB 081003A: Swift-XRT Team position and analysis
  88. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  89. GRB 080928: Fermi GBM detection
  90. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  91. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  92. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  93. Trigger 330353: Swift detection of a Galactic short soft burst
  94. GRB 081001: Observations from OSN
  95. GRB 081001: Swift UVOT Observations
  96. GRB 081001: Swift-XRT position
  97. GRB 080928: Watcher observations
  98. GRB 080928: VLT redshift
  99. GRB 080928: Swift-XRT refined analysis
  100. GRB 080928: Swift/UVOT 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