Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

25779 results found.

  1. GRB 080605: Liverpool Telescope optical afterglow candidate
  2. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  3. GRB 080605: Swift detection of a burst with an optical afterglow
  4. GRB 080603B: TLS Afterglow Observation
  5. GRB 080603A: TLS Afterglow Observation
  6. GRB 080604: MITSuME Okayama observation
  7. GRB 080604, Swift-BAT refined analysis
  8. GRB 080604: Swift-XRT refined analysis
  9. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  10. GRB 080603B : Liverpool Telescope Observations
  11. Konus-Wind observation of GRB 080603B
  12. GRB 080603B: Swift-XRT refined analysis
  13. GRB 080603A: Swift-XRT detection of the afterglow
  14. GRB 080604: Enhanced Swift-XRT position
  15. GRB 080604: Swift detection of a burst with an optical afterglow
  16. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  17. GRB 080516: TAROT La Silla observatory optical observations
  18. GRB080603B: NOT redshift
  19. GRB 080603B: BOOTES2/TELMA optical observations
  20. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  21. GRB 080603B: Swift detection of a burst with optical afterglow
  22. GRB 080603: A long GRB detected by INTEGRAL
  23. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  24. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  25. GRB 080602: Swift-XRT refined analysis
  26. Konus-Wind observation of GRB 080602
  27. GRB 080602: NOT R-band upper limit
  28. GRB 080602: Enhanced Swift-XRT position
  29. GRB 080602: Swift detection of a burst
  30. Swift analysis of BAT Slew Survey event (Trigger=009)
  31. GRB 080523: afterglow confirmation and redshift constraints
  32. Konus-Wind observation of reactivation of SGR 1627-41
  33. Reactivation of SGR 1627-41
  34. GRB 080524: Swift XRT and UVOT analysis
  35. GRB 080503: 2nd Epoch Chandra X-ray Observations
  36. GRB 080524: Swift-BAT detection of a burst in ground analysis
  37. GRB 080523: Swift-XRT refined analysis
  38. GRB 080523, Swift-BAT refined analysis
  39. GRB 080523: VLT optical observations
  40. GRB 080523: Enhanced Swift-XRT position
  41. GRB 080523: Swift detection of a burst
  42. GRB 080515: KPNO 4m NIR afterglow detection
  43. GRB 80516: Swift/UVOT Observations
  44. GRB 080515: Swift-XRT position and analysis
  45. GRB 080514B: UVOT Observations
  46. GRB080520: Swift/UVOT observations
  47. GRB 080520, GROND observations
  48. GRB 080520: Enhanced Swift-XRT position
  49. GRB 080520: Swift XRT Refined Analysis
  50. GRB 080520: Swift detection of a burst with optical afterglow
  51. GRB 080514B: Suzaku WAM observation of the prompt emission
  52. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  53. GRB 080517, Swift-BAT refined analysis
  54. GRB 080517: Swift-XRT refined analysis
  55. GRB 080514B: Further NIR observations
  56. GRB 080517: Enhanced Swift-XRT position
  57. GRB080517: Liverpool Telescope Optical Observations
  58. GRB 080517: Swift detection of a burst
  59. GRB 080516, GROND 2nd epoch observations
  60. GRB 080516, GROND observations
  61. GRB 080516, SMARTS optical/IR observations
  62. GRB 080516: Swift-XRT Team refined analysis
  63. GRB 080516: Enhanced Swift-XRT position
  64. GRB 080516: Swift detection of a burst
  65. Errartum: VLA upper limit on GRB 080507
  66. VLA upper limit on GRB 080705
  67. GRB 080514B : redshift estimation
  68. Konus-Wind observation of GRB 080513
  69. IPN triangulation of bright GRB 080513
  70. GRB 080515, Swift-BAT refined analysis
  71. GRB 080514B: slow fading behaviour ?
  72. GRB 080514B: Swift-XRT analysis
  73. GRB 080514B, GROND observations
  74. GRB 080515: Swift detection of a burst
  75. GRB 080514B: Watcher observations
  76. GRB 080514B: possible AGILE detection at E>50 MeV
  77. GRB 080514B: SuperAGILE/IPN GRB Localization
  78. procesure for GRB Circular
  79. Swift detection of a possible galactic transient
  80. GRB080514: REM NIR & Optical Observations
  81. Konus-Wind observation of GRB 080507
  82. GRB 080319B: Further HST observations and underlying host
  83. GRB 080506: NAYUTA Optical Observation
  84. GRB 080507: Suzaku WAM observation of the prompt emission
  85. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  86. GRB 080507: Keck photometry
  87. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  88. GRB 080503: Hubble Space Telescope Imaging
  89. GRB 080507: Optical Afterglow
  90. GRB 080506:Optical observations from HCT
  91. GRB 080506: VLA radio upper limit
  92. GRB 080507: GRB localization by SuperAGILE
  93. GRB 080506: Swift XRT refined analysis
  94. GRB080506: Swift/UVOT observations
  95. GRB 080506, Swift-BAT refined analysis
  96. GRB080503, RIMOTS optical upper limit
  97. GRB 080506: Observations from NOT
  98. GRB 080506: Enhanced Swift-XRT position
  99. GRB 080506: Swift detection of a burst with optical afterglow
  100. GRB 080503: VLA radio upper limit

Advanced

Download all Circulars as a .tar.gz archive:
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