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"

32509 results found.

  1. GRB 060825: VLA observations
  2. Swift-BAT trigger 226614 is not a GRB
  3. GRB 060825: XRT Team Refined Analysis
  4. GRB 060825: Swift-BAT Refined Analysis
  5. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  6. GRB060825: Liverpool Telescope optical observations
  7. GRB 060825: TNG optical observations
  8. GRB 060825: P60 Observations
  9. GRB060825: BOOTES-IR optical observations
  10. GRB060801: host galaxy redshift
  11. Radio observations of GRB 060719
  12. GRB 060729, SMARTS optical/IR observations
  13. GRB 060813: A long, bright GRB detected with Suzaku WAM
  14. GRB 060814: Confirmation of IR afterglow
  15. Konus-Wind observation of GRB 060814
  16. GRB 060814: Refined analysis of the Swift-BAT burst
  17. GRB 060814: P60 Observations
  18. GRB 060814: P200 NIR Observations
  19. GRB 060814: source inside revised XRT error box
  20. GRB 060814: Possible IR counterpart
  21. GRB060805B: optical observations
  22. GRB060814: Swift/UVOT upper limits
  23. GRB 060813: pseudo-z from spectral parameters of the prompt
  24. GRB 060814: Swift XRT refined analysis
  25. GRB 060814: VLT optical limits
  26. Konus-Wind observation of GRB 060813
  27. GRB060813: Swift/UVOT upper limits
  28. GRB 060813: Swift XRT refined analysis
  29. GRB 060813: Refined analysis of the Swift-BAT burst
  30. GRB051109B: Late-time Radio Observations
  31. Image of the dust-scattering halo around SGR 1806-20
  32. Second VLA limit on new radio point source in SGR 1806-20
  33. A dust-scattering halo detected around SGR 1806-20
  34. GRB 060729: An update on the Swift XRT and UVOT observations
  35. GRB060717: optical observations
  36. GRB060807: Optical limiting magnitudes
  37. GRB 060805B: XRT Team Analysis
  38. VLA Upper Limit on Outburst of SGR 1806-20
  39. GRB060806 is similar to previous activity of SGR1806-20
  40. GRB 060807: UVOT Upper limits
  41. GRB 060807: afterglow confirmation
  42. GRB 060807: K- and R-band observations
  43. GRB 060807: Refined analysis of the Swift-BAT burst
  44. GRB060806 = SGR1806-20
  45. GRB 060805B: RHESSI Spectral Fit
  46. GRB060807: optical upper limit in white light
  47. IPN triangulation of GRB060806 (long, exceptionally bright)
  48. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  49. GRB 060805B: Swift/UVOT Upper Limits
  50. GRB 060807, optical observation
  51. GRB 060807: Kanazawa R-band observation
  52. GRB 060807: optical limit
  53. GRB 060807: Swift detection of a burst
  54. GRB 060801: Second Epoch WSRT Radio Observations
  55. IPN triangulation of GRB060805B
  56. GRB060805 Liverpool Telescope observations
  57. GRB 060805: optical upper limit in R
  58. GRB 060805: XRT Team Refined Analysis
  59. GRB 060805: Swift-BAT Refined Analysis
  60. GRB 060805: Swift/UVOT Upper Limits
  61. GRB 060805: P60 Observations
  62. GRB 060805: KAIT observations
  63. GRB 060804: Swift UVOT observations
  64. GRB 060804: Swift-XRT Team Refined Analysis
  65. GRB 060804: Refined analysis of the Swift-BAT burst
  66. GRB 060728: Upper limits of the X-ray emission
  67. GRB 060801: no variability of optical sources
  68. GRB 060801: WSRT Radio Observations
  69. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  70. GRB060801: Radio Observations
  71. GRB 051109B: Bright spiral host galaxy at low redshift
  72. GRB 060801: optical observations at FORS2/VLT
  73. GRB060801: Swift/UVOT Upper Limits
  74. GRB 060801: optical observations at Hanle and Calar Alto
  75. GRB060801: optical upper limit in R
  76. GRB 060801: Swift XRT refined analysis
  77. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  78. GRB 060801, optical observation
  79. GRB 060801: Kanazawa Optical Observation
  80. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  81. GRB 060218 / SN 2006aj Nebular Spectrum
  82. GRB 060729 redshift
  83. GRB 060719: TORTOREM optical upper limits
  84. GRB 060729: Swift/UVOT Detections
  85. GRB 060729: Refined analysis of the Swift-BAT burst
  86. GRB 060729: Swift-XRT refined analysis
  87. GRB 060729: Swift/UVOT Observations
  88. GRB 060729: ROTSE-III Detection of Optical Counterpart
  89. GRB 060728: Swift/UVOT Upper Limits
  90. GRB 060728: Refined analysis of the Swift-BAT burst
  91. GRB 060728, SMARTS optical/IR observations
  92. Swift/XRT preliminary analysis
  93. GRB060614 ATCA Radio Limits
  94. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  95. GRB 060714: Swift/UVOT Observations
  96. GRB060719: prompt NIR observations with REM
  97. GRB 060714: NOT observations
  98. GRB 060719: near-infrared afterglow
  99. GRB 060719: correction to the coordinates reported in GCN 5347
  100. GRB 060522: VLA 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