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"

28130 results found.

  1. GRB 060729, SMARTS optical/IR observations
  2. GRB 060813: A long, bright GRB detected with Suzaku WAM
  3. Konus-Wind observation of GRB 060814
  4. GRB 060814: Refined analysis of the Swift-BAT burst
  5. GRB 060814: P60 Observations
  6. GRB 060814: P200 NIR Observations
  7. GRB060805B: optical observations
  8. GRB 060814: Swift XRT refined analysis
  9. GRB 060814: VLT optical limits
  10. GRB 060814 - SDSS Pre-Burst Observations
  11. GRB 060814: TAROT optical observations
  12. GRB 060814: Swift detection of a bright burst
  13. Konus-Wind observation of GRB 060813
  14. GRB 060813: Swift XRT refined analysis
  15. GRB 060813: Refined analysis of the Swift-BAT burst
  16. GRB 060813: Swift detection of a burst
  17. GRB051109B: Late-time Radio Observations
  18. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  19. GRB060807: Possible Highly Significant X-ray Emission Lines
  20. GRB 060729: An update on the Swift XRT and UVOT observations
  21. GRB060717: optical observations
  22. GRB060807: Optical limiting magnitudes
  23. GRB 060805B: XRT Team Analysis
  24. GRB060806 is similar to previous activity of SGR1806-20
  25. GRB 060807: XRT Team refined analysis
  26. GRB 060807: Refined analysis of the Swift-BAT burst
  27. GRB060807: optical afterglow candidate
  28. IPN triangulation of GRB060806 (long, exceptionally bright)
  29. GRB060807 - SDSS Pre-burst Observations
  30. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  31. GRB 060805B: Swift/UVOT Upper Limits
  32. GRB 060807, optical observation
  33. GRB 060807: Kanazawa R-band observation
  34. GRB 060807: Swift detection of a burst
  35. GRB060805 Liverpool Telescope observations
  36. GRB 060805: XRT Team Refined Analysis
  37. GRB 060805: Swift-BAT Refined Analysis
  38. GRB 060805: Swift/UVOT Upper Limits
  39. GRB 060805: P60 Observations
  40. GRB 060805 - SDSS Pre-Burst Observations
  41. GRB 060804: Swift UVOT observations
  42. GRB 060804: Swift-XRT Team Refined Analysis
  43. GRB 060804: Refined analysis of the Swift-BAT burst
  44. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  45. GRB 060728: Upper limits of the X-ray emission
  46. GRB 060801: no variability of optical sources
  47. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  48. GRB060801: Radio Observations
  49. GRB 051109B: Bright spiral host galaxy at low redshift
  50. GRB060801: Swift/UVOT Upper Limits
  51. GRB 060801: optical observations at Hanle and Calar Alto
  52. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  53. GRB 060801, optical observation
  54. GRB 060801: Kanazawa Optical Observation
  55. GRB 060719: TORTOREM optical upper limits
  56. GRB 060729: Refined analysis of the Swift-BAT burst
  57. GRB 060729: Swift-XRT refined analysis
  58. GRB 060729: Swift/UVOT Observations
  59. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  60. GRB 060728: Swift/UVOT Upper Limits
  61. GRB 060728, SMARTS optical/IR observations
  62. Swift/XRT preliminary analysis
  63. GRB 060728: Swift detection of a burst
  64. GRB 060714: Swift/UVOT Observations
  65. GRB060719: prompt NIR observations with REM
  66. GRB 060714: NOT observations
  67. GRB 060719: near-infrared afterglow
  68. GRB 060719: correction to the coordinates reported in GCN 5347
  69. GRB 060522: VLA observation
  70. GRB 060719: Swift/UVOT Upper Limits
  71. GRB 060719: VLT/ISAAC observations
  72. GRB 060719: Refined analysis of the Swift-BAT burst
  73. GRB 060719: XRT refined analysis
  74. GRB 060719: further analysis of VLT observations
  75. GRB060719: REM NIR Observations
  76. GRB 060719: VLT observations
  77. GRB 060719: LCO optical observations
  78. GRB 060719: Swift detection of a burst
  79. GRB 060717: Swift XRT refined analysis
  80. GRB 060714: Refined analysis of the Swift-BAT burst
  81. GRB060717: Swift/UVOT upper limits
  82. GRB 060717: Swift-BAT refined analysis
  83. GRB060717 - SDSS Pre-burst Observations
  84. GRB 060714: REM infrared observations
  85. GRB 060717, optical observation
  86. GRB 060714 : Liverpool Telescope Observations
  87. GRB 060714: Swift XRT refined analysis
  88. GRB 060708: VLT spectroscopy
  89. Swift trigger 219136 is probably not a GRB
  90. GRB 060714, optical observation
  91. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  92. GRB060712: P60 Observations
  93. GRB 060712: XRT refined analysis
  94. GRB 060712: Swift/UVOT Upper Limits
  95. GRB060526: optical observations
  96. GRB 060712: XRT refined position
  97. GRB 060712: Refined analysis of the Swift-BAT burst
  98. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  99. GRB 060707: OA fading and redshift
  100. GRB 060708: Swift-XRT refined analysis

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