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"

26513 results found.

  1. GRB 081104: Swift detection of a burst
  2. Radio observation of GRB 080130 with ATCA
  3. GRB 081102: MASTER prompt optical limit
  4. GRB 081102: Swift-XRT refined analysis
  5. GRB 081102: Swift-BAT refined analysis
  6. GRB 081102: Enhanced Swift-XRT position
  7. Radio observation of GRB 080218b with ATCA
  8. Radio observation of GRB 080229a with ATCA
  9. GRB 081102: Swift detection of a burst
  10. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  11. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  12. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  13. GRB 081024B: BTA deep optical observations
  14. Radio observation of GRB 080229b with ATCA
  15. GRB 081024B: VLA radio observation
  16. GRB 081029: Swift-BAT refined analysis
  17. GRB081029: Swift XRT refined analysis
  18. GRB 081025: Suzaku WAM observation of the prompt emission
  19. GRB 081024B: Suzaku WAM observation of the prompt emission
  20. GRB 081029: Enhanced Swift-XRT position
  21. GRB 081029: REM observations
  22. Radio observation of GRB 080303 with ATCA
  23. Radio observation of GRB 080411 with ATCA
  24. GRB 081029: UVES/VLT Absorption Redshift
  25. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  26. GRB 081029: Swift detection of a burst
  27. GRB 081028B: Fermi GBM detection
  28. GRB 081021: Fermi GBM detection
  29. GRB 081028: Swift-XRT refined analysis
  30. GRB 081028, Swift-BAT refined analysis
  31. GRB 081028: Enhanced Swift-XRT position
  32. GRB 081028: TAROT Calern observatory optical observations
  33. GRB 081028: optical observations at the NOT
  34. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  35. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  36. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  37. GRB 081028: Swift detection of a burst
  38. GRB 081024: No radio detection with the VLA
  39. GRB 081025 BAT refined analysis
  40. Konus-Wind observation of GRB 081025
  41. GRB 081025: Burst detection from Swift-BAT slew data
  42. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  43. Fermi-LAT observation of GRB 081024B
  44. GRB 081024: Swift-XRT refined analysis
  45. GRB 081024, Swift-BAT refined analysis
  46. GRB 081024: Enhanced Swift-XRT position
  47. GRB 081024: Swift detection of a burst
  48. GRB 081022, Swift-BAT refined analysis
  49. GRB 081022: Swift detection of a burst
  50. GRB 081012: Swift-XRT Refined Analysis
  51. Swift detection of a possible burst (trigger 332287)
  52. GRB 081012 - Enhanced Swift XRT position
  53. GRB 081017, Swift-BAT refined analysis
  54. GRB 081017: Swift detection of a burst
  55. GRB 081016B, Swift-BAT refined analysis
  56. GRB 081011: Swift XRT refined analysis
  57. GRB 081016B: Swift-XRT Team refined Analysis
  58. GRB 081016B: Enhanced Swift-XRT position
  59. GRB 081016B: Swift detection of a burst
  60. GRB 081011: Enhanced Swift-XRT position
  61. GRB 081016: A long GRB discovered by INTEGRAL
  62. Detection of flare star Algol in Swift-BAT slew data
  63. GRB 081009: Fermi GBM detection
  64. GRB 081012: GROND upper limits
  65. GRB 081012: Fermi GBM detection
  66. GRB 081007 and GRB 081007B: Fermi GBM detection
  67. GRB 080430: optical observations
  68. GRB 081008 optical upper limit
  69. GRB 081012: Observations from NOT
  70. GRB 081012, Swift-BAT refined analysis
  71. GRB 081012: ROTSE-III Optical Limits
  72. GRB 081012: Swift detection of a burst
  73. GRB 081011, Swift-BAT refined analysis
  74. GRB 081011: Swift detection of a burst
  75. GRB 081007: Radio Detection
  76. Konus-Wind observation of GRB 081001
  77. GRB 081008, Swift-BAT refined analysis
  78. GRB 081008: VLT redshift confirmation
  79. GRB 081008: Swift-XRT Refined Analysis
  80. GRB081008: Swift/UVOT observations
  81. GRB 081008: Enhanced Swift-XRT position
  82. GRB 081008: Gemini-South Absorption Redshiftt
  83. GRB 081008: Swift detection of a burst with optical afterglow
  84. GRB081006B: Fermi GBM detection
  85. GRB081006: Fermi GBM detection
  86. GRB 081007, Swift-BAT refined analysis
  87. GRB 081007: Early RAPTOR measurements of optical counterpart
  88. GRB 081007: Swift-XRT Team refined analysis
  89. GRB 081007: Enhanced Swift-XRT position
  90. GRB 081007, Faulkes Telescope North optical observations
  91. GRB 081007, SMARTS optical/IR afterglow observations
  92. GRB 081007: Swift detection of a burst with optical afterglow
  93. GRB081003C: GLAST Burst Monitor detection
  94. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  95. GRB 081003B: TAROT Calern observatory optical observations
  96. GRB 081003A: OSN optical observations
  97. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  98. GRB 081003A: Swift-XRT Team position and analysis
  99. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  100. GRB 081003B: a long GRB detected with 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