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"

39259 results found.

  1. GRB 060605, observations using an Integral Field Unit
  2. GRB 060604: VLA Observation
  3. GRB 060814: Suzaku/WAM observation of the prompt emission
  4. GRB 060605: VLA Observation
  5. GRB 060707: VLA observation
  6. GRB 060825: VLA observations
  7. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  8. Swift-BAT trigger 226614 is not a GRB
  9. GRB060826 - SDSS Pre-Burst Observations
  10. GRB 060826(?): Swift detection of a possible burst
  11. GRB 060825: XRT Team Refined Analysis
  12. GRB 060825: Swift-BAT Refined Analysis
  13. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  14. GRB060825: Liverpool Telescope optical observations
  15. GRB 060825: TNG optical observations
  16. GRB 060825: TAROT optical observations
  17. GRB 060825: P60 Observations
  18. GRB060825: BOOTES-IR optical observations
  19. GRB 060825: Swift detection of a burst
  20. GRB060801: host galaxy redshift
  21. GRB060729: analysis of XMM-Newton observation
  22. GRB 060814: pseudo-z from spectral parameters of the prompt
  23. Radio observations of GRB 060719
  24. GRB 060729, SMARTS optical/IR observations
  25. GRB060814: Break in the XRT light curve
  26. GRB060813: Break in the XRT light curve
  27. GRB 060813: A long, bright GRB detected with Suzaku WAM
  28. GRB 060814: Confirmation of IR afterglow
  29. Konus-Wind observation of GRB 060814
  30. GRB 060814: Refined analysis of the Swift-BAT burst
  31. GRB 060814: P60 Observations
  32. GRB 060814: P200 NIR Observations
  33. GRB 060814: source inside revised XRT error box
  34. GRB 060814: Possible IR counterpart
  35. GRB060805B: optical observations
  36. GRB060814: Swift/UVOT upper limits
  37. GRB 060813: pseudo-z from spectral parameters of the prompt
  38. GRB 060814: Swift XRT refined analysis
  39. GRB 060814: VLT optical limits
  40. GRB 060814 - SDSS Pre-Burst Observations
  41. GRB 060814: TAROT optical observations
  42. GRB 060814: Swift detection of a bright burst
  43. Konus-Wind observation of GRB 060813
  44. GRB060813: Swift/UVOT upper limits
  45. GRB 060813: Swift XRT refined analysis
  46. GRB 060813: Refined analysis of the Swift-BAT burst
  47. GRB 060813: Swift detection of a burst
  48. GRB051109B: Late-time Radio Observations
  49. Second VLA limit on new radio point source in SGR 1806-20
  50. A dust-scattering halo detected around SGR 1806-20
  51. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  52. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  53. GRB060714: optical observations
  54. IBAS Alert n. 3422: not a GRB
  55. GRB 060729: An update on the Swift XRT and UVOT observations
  56. GRB060717: optical observations
  57. GRB060807: Optical limiting magnitudes
  58. GRB 060805B: optical observation at Sierra Nevada
  59. GRB 060805B: XRT Team Analysis
  60. VLA Upper Limit on Outburst of SGR 1806-20
  61. GRB 060807: UVOT Upper limits
  62. GRB 060807: afterglow confirmation
  63. GRB 060807: XRT Team refined analysis
  64. GRB 060807: K- and R-band observations
  65. GRB 060807: Refined analysis of the Swift-BAT burst
  66. GRB060807: optical afterglow candidate
  67. GRB 060805B: RHESSI Spectral Fit
  68. GRB060807: optical upper limit in white light
  69. IPN triangulation of GRB060806 (long, exceptionally bright)
  70. GRB060807 - SDSS Pre-burst Observations
  71. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  72. GRB 060805B: Swift/UVOT Upper Limits
  73. GRB 060807, optical observation
  74. GRB 060807: Kanazawa R-band observation
  75. GRB 060807: optical limit
  76. GRB 060807: Swift detection of a burst
  77. GRB 060801: Second Epoch WSRT Radio Observations
  78. IPN triangulation of GRB060805B
  79. GRB 060805: optical upper limit in R
  80. GRB 060805: XRT Team Refined Analysis
  81. GRB 060805: Swift-BAT Refined Analysis
  82. GRB 060805: Swift/UVOT Upper Limits
  83. GRB 060805: P60 Observations
  84. GRB 060805: KAIT observations
  85. GRB 060805 - SDSS Pre-Burst Observations
  86. GRB 060805: Swift detection of a burst
  87. GRB 060804: Swift UVOT observations
  88. GRB 060804: Swift-XRT Team Refined Analysis
  89. GRB 060804: Refined analysis of the Swift-BAT burst
  90. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  91. GRB 060728: Upper limits of the X-ray emission
  92. GRB 060801: no variability of optical sources
  93. IBAS Alert 3418: not a GRB
  94. GRB 060801: WSRT Radio Observations
  95. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  96. GRB060801: Radio Observations
  97. GRB 051109B: Bright spiral host galaxy at low redshift
  98. GRB 060801: optical observations at FORS2/VLT
  99. GRB 060801: optical observations at Hanle and Calar Alto
  100. GRB060801: optical upper limit in R

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