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"

35952 results found.

  1. GRB 060814: Suzaku/WAM observation of the prompt emission
  2. GRB 060605: VLA Observation
  3. GRB 060707: VLA observation
  4. GRB 060825: VLA observations
  5. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  6. Swift-BAT trigger 226614 is not a GRB
  7. GRB060826 - SDSS Pre-Burst Observations
  8. GRB 060826(?): Swift detection of a possible burst
  9. GRB 060825: XRT Team Refined Analysis
  10. GRB 060825: Swift-BAT Refined Analysis
  11. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  12. GRB060825: Liverpool Telescope optical observations
  13. GRB 060825: TNG optical observations
  14. GRB 060825: TAROT optical observations
  15. GRB 060825: P60 Observations
  16. GRB060825: BOOTES-IR optical observations
  17. GRB 060825: Swift detection of a burst
  18. GRB060801: host galaxy redshift
  19. GRB060729: analysis of XMM-Newton observation
  20. GRB 060814: pseudo-z from spectral parameters of the prompt
  21. Radio observations of GRB 060719
  22. GRB 060729, SMARTS optical/IR observations
  23. GRB060814: Break in the XRT light curve
  24. GRB060813: Break in the XRT light curve
  25. GRB 060813: A long, bright GRB detected with Suzaku WAM
  26. GRB 060814: Confirmation of IR afterglow
  27. Konus-Wind observation of GRB 060814
  28. GRB 060814: Refined analysis of the Swift-BAT burst
  29. GRB 060814: P60 Observations
  30. GRB 060814: P200 NIR Observations
  31. GRB 060814: source inside revised XRT error box
  32. GRB 060814: Possible IR counterpart
  33. GRB060805B: optical observations
  34. GRB060814: Swift/UVOT upper limits
  35. GRB 060813: pseudo-z from spectral parameters of the prompt
  36. GRB 060814: Swift XRT refined analysis
  37. GRB 060814: VLT optical limits
  38. GRB 060814 - SDSS Pre-Burst Observations
  39. GRB 060814: TAROT optical observations
  40. GRB 060814: Swift detection of a bright burst
  41. Konus-Wind observation of GRB 060813
  42. GRB060813: Swift/UVOT upper limits
  43. GRB 060813: Swift XRT refined analysis
  44. GRB 060813: Refined analysis of the Swift-BAT burst
  45. GRB 060813: Swift detection of a burst
  46. GRB051109B: Late-time Radio Observations
  47. Second VLA limit on new radio point source in SGR 1806-20
  48. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  49. GRB060714: optical observations
  50. IBAS Alert n. 3422: not a GRB
  51. GRB 060729: An update on the Swift XRT and UVOT observations
  52. GRB060717: optical observations
  53. GRB060807: Optical limiting magnitudes
  54. GRB 060805B: optical observation at Sierra Nevada
  55. GRB 060805B: XRT Team Analysis
  56. VLA Upper Limit on Outburst of SGR 1806-20
  57. GRB 060807: UVOT Upper limits
  58. GRB 060807: afterglow confirmation
  59. GRB 060807: XRT Team refined analysis
  60. GRB 060807: K- and R-band observations
  61. GRB 060807: Refined analysis of the Swift-BAT burst
  62. GRB060807: optical afterglow candidate
  63. GRB 060805B: RHESSI Spectral Fit
  64. GRB060807: optical upper limit in white light
  65. IPN triangulation of GRB060806 (long, exceptionally bright)
  66. GRB060807 - SDSS Pre-burst Observations
  67. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  68. GRB 060805B: Swift/UVOT Upper Limits
  69. GRB 060807, optical observation
  70. GRB 060807: Kanazawa R-band observation
  71. GRB 060807: optical limit
  72. GRB 060807: Swift detection of a burst
  73. GRB 060801: Second Epoch WSRT Radio Observations
  74. IPN triangulation of GRB060805B
  75. GRB 060805: optical upper limit in R
  76. GRB 060805: XRT Team Refined Analysis
  77. GRB 060805: Swift-BAT Refined Analysis
  78. GRB 060805: Swift/UVOT Upper Limits
  79. GRB 060805: P60 Observations
  80. GRB 060805: KAIT observations
  81. GRB 060805 - SDSS Pre-Burst Observations
  82. GRB 060805: Swift detection of a burst
  83. GRB 060804: Swift UVOT observations
  84. GRB 060804: Swift-XRT Team Refined Analysis
  85. GRB 060804: Refined analysis of the Swift-BAT burst
  86. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  87. GRB 060728: Upper limits of the X-ray emission
  88. GRB 060801: no variability of optical sources
  89. IBAS Alert 3418: not a GRB
  90. GRB 060801: WSRT Radio Observations
  91. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  92. GRB060801: Radio Observations
  93. GRB 051109B: Bright spiral host galaxy at low redshift
  94. GRB 060801: optical observations at FORS2/VLT
  95. GRB 060801: optical observations at Hanle and Calar Alto
  96. GRB060801: optical upper limit in R
  97. GRB 060801: Swift XRT refined analysis
  98. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  99. GRB 060801, optical observation
  100. GRB 060801: Kanazawa Optical 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