Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42283 results found.

  1. GRB 060901: a long GRB detected by INTEGRAL
  2. Two bright bursts from SGR 1806-20 detected with IBAS
  3. GRB 060605, observations using an Integral Field Unit
  4. GRB 060604: VLA Observation
  5. GRB 060814: Suzaku/WAM observation of the prompt emission
  6. GRB 060605: VLA Observation
  7. GRB 060707: VLA observation
  8. GRB060826 - SDSS Pre-Burst Observations
  9. GRB 060826(?): Swift detection of a possible burst
  10. GRB 060825: XRT Team Refined Analysis
  11. GRB 060825: Swift-BAT Refined Analysis
  12. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  13. GRB060825: Liverpool Telescope optical observations
  14. GRB 060825: TNG optical observations
  15. GRB 060825: TAROT optical observations
  16. GRB 060825: P60 Observations
  17. GRB060825: BOOTES-IR optical observations
  18. GRB 060825: Swift detection of a burst
  19. GRB060801: host galaxy redshift
  20. GRB060729: analysis of XMM-Newton observation
  21. GRB 060729, SMARTS optical/IR observations
  22. GRB060814: Break in the XRT light curve
  23. GRB060813: Break in the XRT light curve
  24. GRB 060813: A long, bright GRB detected with Suzaku WAM
  25. GRB 060814: Confirmation of IR afterglow
  26. Konus-Wind observation of GRB 060814
  27. GRB 060814: P60 Observations
  28. GRB 060814: P200 NIR Observations
  29. GRB 060814: Possible IR counterpart
  30. GRB060805B: optical observations
  31. GRB060814: Swift/UVOT upper limits
  32. GRB 060814: Swift XRT refined analysis
  33. GRB 060814: VLT optical limits
  34. GRB 060814 - SDSS Pre-Burst Observations
  35. GRB 060814: TAROT optical observations
  36. GRB 060814: Swift detection of a bright burst
  37. Konus-Wind observation of GRB 060813
  38. GRB060813: Swift/UVOT upper limits
  39. GRB 060813: Swift XRT refined analysis
  40. GRB 060813: Refined analysis of the Swift-BAT burst
  41. GRB 060813: Swift detection of a burst
  42. GRB051109B: Late-time Radio Observations
  43. Image of the dust-scattering halo around SGR 1806-20
  44. Second VLA limit on new radio point source in SGR 1806-20
  45. A dust-scattering halo detected around SGR 1806-20
  46. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  47. GRB060807: Possible Highly Significant X-ray Emission Lines
  48. GRB060714: optical observations
  49. GRB 060729: An update on the Swift XRT and UVOT observations
  50. GRB060717: optical observations
  51. GRB060807: Optical limiting magnitudes
  52. GRB 060805B: optical observation at Sierra Nevada
  53. GRB 060805B: XRT Team Analysis
  54. VLA Upper Limit on Outburst of SGR 1806-20
  55. GRB060806 is similar to previous activity of SGR1806-20
  56. GRB 060807: UVOT Upper limits
  57. GRB 060807: afterglow confirmation
  58. GRB 060807: XRT Team refined analysis
  59. GRB 060807: K- and R-band observations
  60. GRB060807: optical afterglow candidate
  61. GRB060806 = SGR1806-20
  62. GRB 060805B: RHESSI Spectral Fit
  63. GRB060807: optical upper limit in white light
  64. IPN triangulation of GRB060806 (long, exceptionally bright)
  65. GRB060807 - SDSS Pre-burst Observations
  66. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  67. GRB 060805B: Swift/UVOT Upper Limits
  68. GRB 060807, optical observation
  69. GRB 060807: Kanazawa R-band observation
  70. GRB 060807: optical limit
  71. GRB 060807: Swift detection of a burst
  72. GRB 060801: Second Epoch WSRT Radio Observations
  73. IPN triangulation of GRB060805B
  74. GRB060805 Liverpool Telescope observations
  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: Swift detection of a burst with a possible UVOT counterpart
  86. GRB 060728: Upper limits of the X-ray emission
  87. GRB 060801: no variability of optical sources
  88. GRB 060801: WSRT Radio Observations
  89. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  90. GRB 051109B: Bright spiral host galaxy at low redshift
  91. GRB 060801: optical observations at FORS2/VLT
  92. GRB060801: Swift/UVOT Upper Limits
  93. GRB 060801: optical observations at Hanle and Calar Alto
  94. GRB060801: optical upper limit in R
  95. GRB 060801: Swift XRT refined analysis
  96. GRB 060801, optical observation
  97. GRB 060801: Kanazawa Optical Observation
  98. GRB 060801: Swift detection of a short burst
  99. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  100. GRB 060218 / SN 2006aj Nebular Spectrum

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