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"

29096 results found.

  1. GRB 060908: Swift/UVOT Observations
  2. GRB 060908: Danish/DFOSC optical observations
  3. GRB 060908, Swift-BAT refined analysis
  4. GRB 060908 - SDSS Pre-burst Observations
  5. GRB 060908: PROMPT Detection of a Bright Counterpart
  6. GRB 060908: Swift detection of a burst with a bright optical counterpart
  7. GRB 060904A: Suzaku/WAM observation of the prompt emission
  8. GRB060904b optical detections (delayed report due to internet outage)
  9. GRB 060906: optical observation
  10. GRB 060906: Early RAPTOR optical limits
  11. GRB 060906, Swift-BAT refined spectral analysis
  12. GRB 060906: Swift/XRT Refined Analysis
  13. GRB 060906: Swift-UVOT observations
  14. GRB 060906, Swift-BAT refined analysis
  15. GRB 060906: KAIT observations
  16. GRB 060906 (?): P60 Optical Afterglow Candidate
  17. GRB 060906: Swift detection of a probable burst
  18. GRB 060904B: RTT150 optical observations
  19. GRB060904A: Swift/UVOT optical observations
  20. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  21. GRB 060904B: Swift-BAT refined analysis
  22. GRB060904b: Optical observations with Swift/UVOT
  23. Konus-Wind observation of GRB 060904A
  24. GRB 060904B: Swift-XRT refined analysis
  25. GRB 060904A: Refined analysis of the Swift-BAT burst
  26. GRB 060904A: Swift-XRT refined analysis
  27. GRB 060904B: Optical observations at Crni Vrh
  28. GRB 060904B: TAROT optical counterpart observations
  29. GRB060904B - SDSS Pre-Burst Observations
  30. GRB 060904: TAROT optical observations
  31. GRB 060904B: Swift detection of a burst with optical counterpart
  32. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  33. GRB060904 - SDSS Pre-Burst Observations
  34. GRB 060904: Swift detection of a bright burst
  35. GRB 060901: Swift/XRT Refined Analysis
  36. GRB 060814: Suzaku/WAM observation of the prompt emission
  37. Swift-BAT trigger 226614 is not a GRB
  38. GRB060826 - SDSS Pre-Burst Observations
  39. GRB 060826(?): Swift detection of a possible burst
  40. GRB 060825: XRT Team Refined Analysis
  41. GRB 060825: Swift-BAT Refined Analysis
  42. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  43. GRB060825: Liverpool Telescope optical observations
  44. GRB 060825: TAROT optical observations
  45. GRB 060825: Swift detection of a burst
  46. GRB060814: Break in the XRT light curve
  47. GRB060813: Break in the XRT light curve
  48. GRB 060813: A long, bright GRB detected with Suzaku WAM
  49. Konus-Wind observation of GRB 060814
  50. GRB 060814: Refined analysis of the Swift-BAT burst
  51. GRB060814: Swift/UVOT upper limits
  52. GRB 060814: Swift XRT refined analysis
  53. GRB 060814 - SDSS Pre-Burst Observations
  54. GRB 060814: TAROT optical observations
  55. GRB 060814: Swift detection of a bright burst
  56. Konus-Wind observation of GRB 060813
  57. GRB060813: Swift/UVOT upper limits
  58. GRB 060813: Swift XRT refined analysis
  59. GRB 060813: Refined analysis of the Swift-BAT burst
  60. GRB 060813: Swift detection of a burst
  61. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  62. GRB060807: Possible Highly Significant X-ray Emission Lines
  63. GRB060807: Optical limiting magnitudes
  64. GRB 060805B: XRT Team Analysis
  65. GRB 060807: UVOT Upper limits
  66. GRB 060807: XRT Team refined analysis
  67. GRB 060807: Refined analysis of the Swift-BAT burst
  68. GRB060807: optical upper limit in white light
  69. GRB060807 - SDSS Pre-burst Observations
  70. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  71. GRB 060807, optical observation
  72. GRB 060807: Kanazawa R-band observation
  73. GRB 060807: Swift detection of a burst
  74. GRB 060805: optical upper limit in R
  75. GRB 060805: XRT Team Refined Analysis
  76. GRB 060805: Swift-BAT Refined Analysis
  77. GRB 060805: Swift/UVOT Upper Limits
  78. GRB 060805: KAIT observations
  79. GRB 060805 - SDSS Pre-Burst Observations
  80. GRB 060805: Swift detection of a burst
  81. GRB 060804: Swift UVOT observations
  82. GRB 060804: Swift-XRT Team Refined Analysis
  83. GRB 060804: Refined analysis of the Swift-BAT burst
  84. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  85. GRB 060728: Upper limits of the X-ray emission
  86. GRB060801: Swift/UVOT Upper Limits
  87. GRB060801: optical upper limit in R
  88. GRB 060801: Swift XRT refined analysis
  89. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  90. GRB 060801: Kanazawa Optical Observation
  91. GRB 060801: Swift detection of a short burst
  92. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  93. GRB 060218 / SN 2006aj Nebular Spectrum
  94. Swift-BAT trigger 221873 is not a GRB or a Transient
  95. GRB 060719: TORTOREM optical upper limits
  96. GRB 060729: Refined analysis of the Swift-BAT burst
  97. GRB 060729: Swift/UVOT Observations
  98. GRB 060729: ROTSE-III Detection of Optical Counterpart
  99. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  100. GRB 060728: Swift/UVOT Upper Limits

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