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"

42660 results found.

  1. GRB 081011: Swift XRT refined analysis
  2. GRB 081016B: Swift-XRT Team refined Analysis
  3. GRB 081016B: Enhanced Swift-XRT position
  4. GRB 081016B: ROTSE-III Optical Limits
  5. GRB 081016B: Swift detection of a burst
  6. GRB 081011: Enhanced Swift-XRT position
  7. Swift detection of flare on CC Eri
  8. GRB 081016: A long GRB discovered by INTEGRAL
  9. Trigger 331721 Due to Swift startracker loss-of-lock
  10. Detection of flare star Algol in Swift-BAT slew data
  11. GRB 081009: Fermi GBM detection
  12. GRB 081012: GROND upper limits
  13. GRB 081008: Galaxy associated with z=1.967 absorber
  14. Swift-BAT triggered on the flare star Algol
  15. GRB 081012: Fermi GBM detection
  16. GRB 081007 and GRB 081007B: Fermi GBM detection
  17. GRB 080430: optical observations
  18. GRB 081008 optical upper limit
  19. GRB 081012: Observations from NOT
  20. GRB 081012: Swift/XRT detection
  21. GRB 081012, Swift-BAT refined analysis
  22. GRB 081012: Swift detection of a burst
  23. Revised table for GRB 081011 UVOT detections
  24. GRB081011: UVOT detection of an optical afterglow
  25. GRB 081011: Swift/XRT detection
  26. GRB 081011, Swift-BAT refined analysis
  27. GRB 081008, SMARTS optical/IR afterglow observations
  28. GRB 081011: Swift detection of a burst
  29. GRB 081007: Radio Detection
  30. Konus-Wind observation of GRB 081001
  31. GRB 081007: Rapid PROMPT Detections
  32. GRB 081008, Swift-BAT refined analysis
  33. GRB 081008: VLT redshift confirmation
  34. GRB 081008: Swift-XRT Refined Analysis
  35. GRB081008: Swift/UVOT observations
  36. GRB 081008: Enhanced Swift-XRT position
  37. GRB 081008: Gemini-South Absorption Redshiftt
  38. GRB 081008: VLT/FORS2 spectroscopy
  39. GRB 081008: Swift detection of a burst with optical afterglow
  40. GRB 081008: ROTSE-III Detection of Optical Counterpart
  41. GRB081006B: Fermi GBM detection
  42. GRB081006: Fermi GBM detection
  43. GRB081007: Swift/UVOT Observations
  44. GRB 081007, SMARTS optical afterglow observations
  45. GRB 081007, Swift-BAT refined analysis
  46. GRB 081007: Swift-XRT Team refined analysis
  47. GRB 081007: Gemini-south redshift
  48. GRB 081007: Enhanced Swift-XRT position
  49. GRB 081007, Faulkes Telescope North optical observations
  50. GRB 081007, SMARTS optical/IR afterglow observations
  51. GRB 081007: REM NIR and optical counterpart
  52. GRB 081007: Swift detection of a burst with optical afterglow
  53. GRB081003C: GLAST Burst Monitor detection
  54. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  55. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  56. GRB 081003B: TAROT Calern observatory optical observations
  57. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  58. GRB 081003B: Swift-XRT upper limit
  59. GRB 081003A: OSN optical observations
  60. GRB 081001: Further observations from OSN
  61. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  62. GRB081003B: Optical limits from Spain
  63. GRB 081003A: Swift-XRT Team position and analysis
  64. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  65. GRB 081003B: a long GRB detected with INTEGRAL
  66. GRB 080928: Fermi GBM detection
  67. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  68. GRB 081003: A long GRB discovered by INTEGRAL
  69. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  70. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  71. Trigger 330353: Swift detection of a Galactic short soft burst
  72. GRB 081001: Observations from OSN
  73. GRB 080925: Suzaku WAM observation of the prompt emission
  74. GRB 081001: Swift UVOT Observations
  75. GRB 081001: Swift-XRT position
  76. GRB081001: optical limit from ASH-Centurion
  77. GRB081001: SuperAGILE Localization of a long GRB
  78. GRB080928: redshift retraction
  79. GRB 080928: Watcher observations
  80. GRB 080927: Fermi GBM detection
  81. GRB 080928: VLT redshift
  82. GRB080928: Gemini-South Absorption Redshift
  83. GRB 080928: Swift-XRT refined analysis
  84. GRB 080928: Swift/UVOT observations
  85. GRB 080928, Swift-BAT final refined analysis
  86. GRB 080928: GROND DETECTION
  87. GRB 080928: Enhanced Swift-XRT position
  88. GRB 080928, Swift-BAT initial refined analysis
  89. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  90. GRB 080928: Swift detection of a burst with an optical counterpart
  91. GRB 080925: Fermi GBM Detection
  92. GRB 080920: Fermi GBM detection
  93. Swift-BAT trigger 325707 is not a GRB
  94. Swift trigger 325707: Swift/UVOT Upper Limits
  95. Swift trigger 325707: Swift-XRT upper limit
  96. Swift detection of a possible GRB (trigger 325707)
  97. GRB080916A: Suzaku WAM observation of the prompt emission
  98. GRB 080922: Swift/UVOT Upper Limits
  99. GRB080922: Swift-XRT upper limit
  100. GRB080922: A long GRB detected by INTEGRAL

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