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"

19542 results found.

  1. GRB 080607: Keck/LRIS spectroscopy and redshift
  2. GRB 080607: Swift detection of a burst with optical afterglow
  3. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  4. GRB 080604: VLA radio upper limit
  5. GRB 080605, Swift-BAT refined analysis
  6. GRB 080603B: VLA radio upper limit
  7. GRB 080605, Swift-BAT refined analysis
  8. GRB 080605: MASTER VWF 46 s AT observation
  9. GRB 080605: Enhanced Swift-XRT position
  10. GRB 080605: GROND detection of the optical afterglow candidate
  11. GRB 080605: Liverpool Telescope optical afterglow candidate
  12. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  13. GRB 080605: Swift detection of a burst with an optical afterglow
  14. GRB 080603B: TLS Afterglow Observation
  15. GRB 080603A: TLS Afterglow Observation
  16. GRB 080604: MITSuME Okayama observation
  17. GRB 080604: Swift-XRT refined analysis
  18. GRB 080603B : Liverpool Telescope Observations
  19. GRB 080603A: Swift-XRT detection of the afterglow
  20. GRB 080604: Enhanced Swift-XRT position
  21. GRB 080603B, Swift-BAT refined analysis
  22. GRB 080604: Swift detection of a burst with an optical afterglow
  23. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  24. GRB 080516: TAROT La Silla observatory optical observations
  25. GRB080603B: NOT redshift
  26. GRB 080603B: BOOTES2/TELMA optical observations
  27. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  28. GRB 080603B: Swift detection of a burst with optical afterglow
  29. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  30. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  31. GRB 080602: Swift-XRT refined analysis
  32. GRB 080602: NOT R-band upper limit
  33. GRB 080602: Enhanced Swift-XRT position
  34. GRB 080602: Swift detection of a burst
  35. Swift analysis of BAT Slew Survey event (Trigger=009)
  36. GRB 080523: afterglow confirmation and redshift constraints
  37. GRB 080524: Swift XRT and UVOT analysis
  38. GRB 080503: 2nd Epoch Chandra X-ray Observations
  39. GRB 080524: Swift-BAT detection of a burst in ground analysis
  40. GRB 080523: VLT optical observations
  41. GRB 080523: Enhanced Swift-XRT position
  42. GRB 080523: Swift detection of a burst
  43. GRB 080515: KPNO 4m NIR afterglow detection
  44. GRB 80516: Swift/UVOT Observations
  45. GRB 080515: Swift-XRT position and analysis
  46. GRB 080520, Swift-BAT refined analysis
  47. GRB 080514B: UVOT Observations
  48. GRB080520: Swift/UVOT observations
  49. GRB 080520, GROND observations
  50. GRB 080520: Enhanced Swift-XRT position
  51. GRB 080520: Swift XRT Refined Analysis
  52. GRB 080520: Swift detection of a burst with optical afterglow
  53. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  54. GRB 080514B: Further NIR observations
  55. GRB 080517: Enhanced Swift-XRT position
  56. GRB080517: Liverpool Telescope Optical Observations
  57. GRB 080517: Swift detection of a burst
  58. GRB 080516, GROND 2nd epoch observations
  59. GRB 080516, GROND observations
  60. GRB 080516, SMARTS optical/IR observations
  61. GRB 080516: Enhanced Swift-XRT position
  62. GRB 080516: Swift detection of a burst
  63. Errartum: VLA upper limit on GRB 080507
  64. VLA upper limit on GRB 080705
  65. IPN triangulation of bright GRB 080513
  66. GRB 080515, Swift-BAT refined analysis
  67. GRB 080514B: slow fading behaviour ?
  68. GRB 080514B: Swift-XRT analysis
  69. GRB 080514B, GROND observations
  70. GRB 080515: Swift detection of a burst
  71. GRB 080514B: Watcher observations
  72. GRB 080514B: SuperAGILE/IPN GRB Localization
  73. Swift detection of a possible galactic transient
  74. GRB080514: REM NIR & Optical Observations
  75. GRB 080506: NAYUTA Optical Observation
  76. GRB 080507: Keck photometry
  77. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  78. GRB 080507: Optical Afterglow
  79. GRB 080506:Optical observations from HCT
  80. GRB 080506: VLA radio upper limit
  81. GRB080506: Swift/UVOT observations
  82. GRB080503, RIMOTS optical upper limit
  83. GRB 080506: Observations from NOT
  84. GRB 080506: Enhanced Swift-XRT position
  85. GRB 080506: Swift detection of a burst with optical afterglow
  86. GRB 080503: VLA radio upper limit
  87. GRB 080503: Observations from NOT
  88. GRB 080430: TLS imaging one day after the GRB
  89. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  90. GRB 080503, Swift-BAT refined analysis
  91. GRB 080430
  92. GRB 080503: Enhanced Swift-XRT position
  93. GRB 080503: New candidate afterglow/host in Gemini imaging
  94. GRB 080503: Swift detection of a short burst
  95. GRB 080411: Continued Swift Monitoring
  96. GRB080430: Swift/UVOT observations
  97. VLA radio upper limit on GRB 080430
  98. GRB 080430: Enhanced Swift-XRT position
  99. GRB 080430 - SDSS Pre-Burst Observations
  100. GRB 080430: Bootes observation

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