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"

27779 results found.

  1. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  2. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  3. SGR 0501+4516: optical observations
  4. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  5. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  6. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  7. GRB 080822B: Swift detection of a burst
  8. GRB080818B: GLAST Burst Monitor detection
  9. Third event from SGR 0501+4516
  10. New Soft Gamma Repeater 0501+4516 was GRB 080822
  11. GRB 080822: Swift detection of a short burst
  12. GLAST Burst Monitor detection of a GRB: 080816B
  13. GLAST Burst Monitor detection of GRB 080818
  14. GLAST Burst Monitor detection of GRB080817B
  15. GLAST Burst Monitor detection of GRB 080817
  16. GLAST Burst Monitor detection of GRB080816
  17. GLAST Burst Monitor detection of GRB 080812
  18. Radio detection of GRB 080810 with the VLA
  19. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  20. GLAST Burst Monitor detection of GRB 080810
  21. GRB 080810: Swift/UVOT Refined Analysis
  22. GRB 080810: D50 optical observation
  23. GRB 080810: Kanazawa optical observation
  24. GRB 080810: Swift-XRT Team refined analysis
  25. GRB 080810: Enhanced Swift-XRT position
  26. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  27. GRB 080810, Swift-BAT refined analysis
  28. GRB 080810: Swift detection of a burst with a bright optical afterglow
  29. GRB 080723B: XMM-Newton observation
  30. GRB 080804: GROND observations
  31. GRB 080727B: Late VLT imaging
  32. GRB 080805: Swift-XRT Refined Analysis
  33. GRB 080805: Swift/UVOT Upper Limits
  34. GRB 080804: Swift-XRT Refined Analysis
  35. GRB 080804: Swift/UVOT Refined Analysis
  36. GRB 080805, Swift-BAT refined analysis
  37. GRB 080804, Swift-BAT refined analysis
  38. GRB 080804: Enhanced Swift-XRT position
  39. GRB 080804: Faulkes Telescope South observations
  40. GRB080805 optical limit by "Pi of the Sky"
  41. GRB 080805: GROND detection of possible afterglow
  42. GRB 080805: Swift detection of a burst
  43. GRB 080804: Swift detection of a burst with optical afterglow
  44. GRB 080804: ROTSE-III Detection of Optical Counterpart
  45. GRB 080802: Swift/UVOT Upper Limits
  46. GRB 080802: Swift-XRT Refined Analysis
  47. GRB 080802, Swift-BAT refined analysis
  48. GRB 080802: Swift detection of a probable burst
  49. GRB 080727C: Suzaku WAM observation of the prompt emission
  50. GRB 080727A: Early IR observations
  51. GRB 080727C: TAROT Calern observatory optical observations
  52. GRB 080727B: KAIT photometry and an early lightcurve break
  53. GRB 080727B: GROND redshift limit
  54. GRB 080727C, Swift-BAT refined analysis
  55. GRB 080727C: Swift/UVOT Upper Limits
  56. Konus-Wind observation of GRB 080727B
  57. GRB 080727C: Swift XRT refined analysis
  58. GRB 080727C: Enhanced Swift-XRT position
  59. GRB 080727B: REM NIR afterglow prompt detection
  60. GRB080727C: RTT150 optical observations
  61. GRB 080727C: Swift detection of a burst
  62. Swift detection of XTE J1701-407
  63. GRB 080727B: Swift/UVOT Upper Limits
  64. BAT Trigger 318150 is not a GRB
  65. GRB 080727B: Swift-XRT refined analysis
  66. GRB 080727B, Swift-BAT refined analysis
  67. GRB 080727A, Swift-BAT refined analysis
  68. GRB 080727A: Swift-XRT refined analysis
  69. GRB080727A: Swift/UVOT Upper Limits
  70. GRB 080727B: Enhanced Swift-XRT position
  71. GRB 080727A: Enhanced Swift-XRT position
  72. GRB 080727B: Swift detection of a bright burst
  73. GRB 080727: Swift detection of a burst
  74. GRB 080725, Swift-BAT refined analysis
  75. GRB 080723A: optical upper limit
  76. GRB080723B: Swift/UVOT Upper Limits
  77. GRB 080725: Swift detection of a burst
  78. GRB 080723A: Swift/UVOT Upper Limits
  79. GRB 080723B - correction to flux conversion factor
  80. GRB 080723B - Swift-XRT refined analysis
  81. GRB 080723B - Swift-XRT position
  82. GRB 080723, Swift-BAT refined analysis
  83. GRB 080723A: Swift-XRT refined analysis
  84. GRB 080723B: Detection and Localization by SuperAGILE
  85. GRB 080723: Enhanced Swift-XRT position
  86. GRB 080723: Swift detection of a burst
  87. TNG/DOLORES redshift for GRB080721
  88. GRB 080721: UVOT Follow-Up Observations
  89. Konus-Wind observation of GRB 080721
  90. GRB 080721: Swift-XRT refined analysis
  91. GRB 080721: Enhanced Swift-XRT position
  92. GRB 080721, Swift-BAT refined analysis
  93. GRB 080721: Swift/UVOT Photometric Redshift
  94. GRB 080721: Swift-XRT correct position
  95. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  96. Retraction of Swift Trigger 317393
  97. Trigger 317393: Swift detection of a possible GRB
  98. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  99. GRB 080714: GROND confirmation of the optical/NIR afterglow
  100. Konus-Wind observation of GRB 080714

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