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"

21772 results found.

  1. GRB 060904B: TAROT optical counterpart observations
  2. GRB060904B - SDSS Pre-Burst Observations
  3. GRB 060904: TAROT optical observations
  4. GRB 060904B: Swift detection of a burst with optical counterpart
  5. GRB060904 - SDSS Pre-Burst Observations
  6. GRB 060904: Swift detection of a bright burst
  7. GRB060901: Optical observations
  8. 060901: Swift UVOT followup observations
  9. Konus-Wind observation of GRB 060901
  10. GRB 060605, observations using an Integral Field Unit
  11. GRB 060604: VLA Observation
  12. GRB 060814: Suzaku/WAM observation of the prompt emission
  13. GRB 060605: VLA Observation
  14. GRB 060707: VLA observation
  15. GRB 060825: VLA observations
  16. GRB060826 - SDSS Pre-Burst Observations
  17. GRB 060826(?): Swift detection of a possible burst
  18. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  19. GRB 060825: TNG optical observations
  20. GRB 060825: TAROT optical observations
  21. GRB 060825: P60 Observations
  22. GRB060729: analysis of XMM-Newton observation
  23. GRB 060729, SMARTS optical/IR observations
  24. GRB 060813: A long, bright GRB detected with Suzaku WAM
  25. Konus-Wind observation of GRB 060814
  26. GRB 060814: Refined analysis of the Swift-BAT burst
  27. GRB 060814: P60 Observations
  28. GRB 060814: P200 NIR Observations
  29. GRB 060814: VLT optical limits
  30. GRB 060814 - SDSS Pre-Burst Observations
  31. GRB 060814: TAROT optical observations
  32. GRB 060814: Swift detection of a bright burst
  33. Konus-Wind observation of GRB 060813
  34. GRB 060813: Swift detection of a burst
  35. GRB051109B: Late-time Radio Observations
  36. Second VLA limit on new radio point source in SGR 1806-20
  37. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  38. GRB060807: Possible Highly Significant X-ray Emission Lines
  39. GRB 060729: An update on the Swift XRT and UVOT observations
  40. GRB060717: optical observations
  41. GRB 060805B: XRT Team Analysis
  42. VLA Upper Limit on Outburst of SGR 1806-20
  43. GRB060806 is similar to previous activity of SGR1806-20
  44. GRB 060807: K- and R-band observations
  45. GRB060807: optical afterglow candidate
  46. GRB060807: optical upper limit in white light
  47. IPN triangulation of GRB060806 (long, exceptionally bright)
  48. GRB060807 - SDSS Pre-burst Observations
  49. GRB 060805B: Swift/UVOT Upper Limits
  50. GRB 060807, optical observation
  51. GRB 060807: Kanazawa R-band observation
  52. GRB060805 Liverpool Telescope observations
  53. GRB 060805: Swift/UVOT Upper Limits
  54. GRB 060805: P60 Observations
  55. GRB 060805 - SDSS Pre-Burst Observations
  56. GRB 060805: Swift detection of a burst
  57. GRB 060804: Swift UVOT observations
  58. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  59. GRB 060728: Upper limits of the X-ray emission
  60. GRB 060801: no variability of optical sources
  61. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  62. GRB060801: Radio Observations
  63. GRB 051109B: Bright spiral host galaxy at low redshift
  64. GRB060801: Swift/UVOT Upper Limits
  65. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  66. GRB 060801, optical observation
  67. GRB 060801: Kanazawa Optical Observation
  68. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  69. GRB 060719: TORTOREM optical upper limits
  70. GRB 060729: Swift-XRT refined analysis
  71. GRB 060729: Swift/UVOT Observations
  72. GRB 060729: ROTSE-III Detection of Optical Counterpart
  73. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  74. GRB 060728: Swift/UVOT Upper Limits
  75. GRB 060728, SMARTS optical/IR observations
  76. Swift/XRT preliminary analysis
  77. GRB 060728: Swift detection of a burst
  78. GRB 060714: Swift/UVOT Observations
  79. GRB060719: prompt NIR observations with REM
  80. GRB 060714: NOT observations
  81. GRB 060719: near-infrared afterglow
  82. GRB 060522: VLA observation
  83. GRB 060719: Swift/UVOT Upper Limits
  84. GRB 060719: VLT/ISAAC observations
  85. GRB 060719: Refined analysis of the Swift-BAT burst
  86. GRB 060719: XRT refined analysis
  87. GRB060719: REM NIR Observations
  88. GRB 060719: VLT observations
  89. GRB 060719: LCO optical observations
  90. GRB 060719: Swift detection of a burst
  91. GRB 060714: Refined analysis of the Swift-BAT burst
  92. GRB060717: Swift/UVOT upper limits
  93. GRB060717 - SDSS Pre-burst Observations
  94. GRB 060714: REM infrared observations
  95. GRB 060717, optical observation
  96. GRB 060717: Swift detection of a burst
  97. GRB 060714 : Liverpool Telescope Observations
  98. GRB 060708: VLT spectroscopy
  99. Swift trigger 219136 is probably not a GRB
  100. GRB 060714, 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