Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

42200 results found.

  1. Reactivation of SGR 1627-41
  2. GRB 080524: Swift XRT and UVOT analysis
  3. GRB 080503: 2nd Epoch Chandra X-ray Observations
  4. GRB 080524: Swift-BAT detection of a burst in ground analysis
  5. GRB 080523: Swift-XRT refined analysis
  6. GRB 080523, Swift-BAT refined analysis
  7. GRB 080520: VLT host detection
  8. GRB 080523: VLT optical observations
  9. Swift/UVOT observations of GRB 080523
  10. GRB 080523: Enhanced Swift-XRT position
  11. GRB 080523: Swift detection of a burst
  12. GRB 080515: KPNO 4m NIR afterglow detection
  13. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  14. GRB 80516: Swift/UVOT Observations
  15. GRB 080515: Swift-XRT position and analysis
  16. GRB 080520, Swift-BAT refined analysis
  17. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  18. GRB 080514B: UVOT Observations
  19. GRB080520: Swift/UVOT observations
  20. GRB 080520: VLT redshift
  21. GRB 080520, GROND observations
  22. GRB 080520: Enhanced Swift-XRT position
  23. GRB 080520: Swift XRT Refined Analysis
  24. GRB 080520: Swift detection of a burst with optical afterglow
  25. GRB 080514B: Suzaku WAM observation of the prompt emission
  26. Konus-Wind observation of GRB 080514B
  27. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  28. GRB 080517, Swift-BAT refined analysis
  29. GRB 080516, GROND further analysis
  30. GRB 080517: Swift-XRT refined analysis
  31. GRB 080514B: Further NIR observations
  32. GRB 080517: Enhanced Swift-XRT position
  33. GRB080517: Liverpool Telescope Optical Observations
  34. GRB 080517: Swift detection of a burst
  35. GRB 080516, GROND observations
  36. GRB080430: optical observations
  37. GRB 080516, SMARTS optical/IR observations
  38. GRB 080516: Swift-XRT Team refined analysis
  39. GRB 080516, Swift-BAT refined analysis
  40. GRB 080516: Enhanced Swift-XRT position
  41. GRB 080514B: NOT observations
  42. GRB 080516: Swift detection of a burst
  43. GRB 080514B : redshift estimation
  44. Konus-Wind observation of GRB 080513
  45. IPN triangulation of bright GRB 080513
  46. Swift-BAT refined analysis for Trigger 311603: Galactic source
  47. GRB 080515, Swift-BAT refined analysis
  48. GRB 080514B: Swift-XRT analysis
  49. GRB 080515: Swift detection of a burst
  50. GRB 080514B: Finding chart
  51. GRB 080514B: Afterglow candidate
  52. GRB 080514B: possible AGILE detection at E>50 MeV
  53. GRB 080514B: SuperAGILE/IPN GRB Localization
  54. Swift detection of a possible galactic transient
  55. GRB080514: REM NIR & Optical Observations
  56. Konus-Wind observation of GRB 080507
  57. GRB 080506: NAYUTA Optical Observation
  58. GRB 080507: Suzaku WAM observation of the prompt emission
  59. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  60. GRB 080507: Keck photometry
  61. GRB 080507: E Pur Si Muove!
  62. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  63. GRB 080503: Hubble Space Telescope Imaging
  64. GRB080507: Swift/UVOT followup observations
  65. GRB 080507: Optical Afterglow
  66. GRB 080506:Optical observations from HCT
  67. GRB 080507: Swift-XRT position of a possible afterglow
  68. GRB 080507: GRB localization by SuperAGILE
  69. GRB 080506: TLS 2nd Epoch - possible light curve break
  70. GRB 080503: Fading in continued Gemini imaging
  71. GRB 080506: Swift XRT refined analysis
  72. GRB080506: Swift/UVOT observations
  73. GRB 080506, Swift-BAT refined analysis
  74. GRB080503, RIMOTS optical upper limit
  75. GRB 080506: Observations from NOT
  76. GRB 080506: optical observation from Ondrejov
  77. GRB 080506: TLS afterglow detection in VRIZ
  78. GRB 080506: Enhanced Swift-XRT position
  79. GRB 080506: Optical observation with KANATA/TRISPEC
  80. GRB 080506: Swift detection of a burst with optical afterglow
  81. GRB 080503: Slow-rise optical AG ?
  82. GRB 080430: TLS imaging one day after the GRB
  83. GRB 080503: No further optical rebrightening
  84. GRB 080503: Late-time Optical rebrightening (possible mini-SN) - correction
  85. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  86. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  87. GRB 080503: MITSuME Ishigakijima optical upper limits
  88. GRB080503: Swift/UVOT Upper Limits
  89. GRB080503 XRT refined analysis
  90. GRB 080503, Swift-BAT refined analysis
  91. GRB 080430
  92. GRB 080430
  93. GRB 080430
  94. GRB 080503: Enhanced Swift-XRT position
  95. GRB 080503: MITSuME Akeno optical upper limits
  96. GRB 080503: New candidate afterglow/host in Gemini imaging
  97. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  98. GRB 080503: Swift detection of a short burst
  99. GRB 080411: Continued Swift Monitoring
  100. GRB 080430: Optical 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