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"

35997 results found.

  1. GRB080823: Fermi Gamma-ray Burst Monitor detection
  2. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  3. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  4. Konus-Wind observation of GRB 080825B
  5. GRB080825C: GLAST Burst Monitor detection
  6. GRB 080825B: Swift-XRT team analysis
  7. GRB080825: Afterglow confirmation and redshift estimate
  8. GRB 080825B - optical counterpart candidate
  9. GRB 080825B: GRB Localization by SuperAGILE
  10. GRB 080822B, Swift-BAT refined analysis
  11. GRB 080822B: MASTER optical observation
  12. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  13. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  14. GRB 080822B: Swift detection of a burst
  15. GRB080818B: GLAST Burst Monitor detection
  16. GRB 080822 (SGR 0501+4516): archival optical observations
  17. New Soft Gamma Repeater 0501+4516 was GRB 080822
  18. GRB 080822: Swift detection of a short burst
  19. GLAST Burst Monitor detection of a GRB: 080816B
  20. GLAST Burst Monitor detection of GRB 080818
  21. GLAST Burst Monitor detection of GRB080817B
  22. GLAST Burst Monitor detection of GRB 080817
  23. GLAST Burst Monitor detection of GRB080816
  24. GRB080810 - optical observations
  25. GRB080810: optical observations
  26. GLAST Burst Monitor detection of GRB 080812
  27. Radio detection of GRB 080810 with the VLA
  28. GRB 080810: RTT150 optical observations
  29. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  30. GLAST Burst Monitor detection of GRB 080810
  31. GRB 080810: Liverpool and Faulkes North observations
  32. GRB 080810: RTT150 optical observations
  33. GRB080810: MITSuME optical observation
  34. First GLAST Burst Monitor GRB Circulars
  35. GRB 080810: Swift/UVOT Refined Analysis
  36. GRB 080810: optical observations
  37. GRB 080810: Liverpool Telescope observations
  38. GRB 080810: D50 optical observation
  39. GRB 080810: Kanazawa optical observation
  40. GRB 080810: OSN follow-up
  41. GRB 080810: Observations from NOT
  42. GRB 080810: RTT150 optical observations
  43. GRB 080810: Swift-XRT Team refined analysis
  44. GRB 080810: Enhanced Swift-XRT position
  45. GRB 080810: KANATA optical-NIR observation, update
  46. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  47. GRB 080810: Keck/HIRES Spectroscopy
  48. GRB 080810, Swift-BAT refined analysis
  49. GRB 080810 : optical observation with KANATA
  50. GRB 080810: Swift detection of a burst with a bright optical afterglow
  51. GRB 080723B: GROND upper limits
  52. GRB 080723B: XMM-Newton observation
  53. GRB 080805: VLT redshift update
  54. GRB 080805: Faulkes Telescope South optical observations
  55. GRB 080804: GROND observations
  56. GRB 080727B: Late VLT imaging
  57. GRB 080804: ATCA Radio Observations
  58. GRB 080805: Swift-XRT Refined Analysis
  59. GRB 080805: Swift/UVOT Upper Limits
  60. GRB 080804: Swift-XRT Refined Analysis
  61. GRB 080804: Swift/UVOT Refined Analysis
  62. GRB 080805, Swift-BAT refined analysis
  63. GRB 080804, Swift-BAT refined analysis
  64. GRB 080804: Enhanced Swift-XRT position
  65. GRB080804: Gemini South redshift confirmation
  66. GRB 080804: Faulkes Telescope South observations
  67. GRB080805 optical limit by "Pi of the Sky"
  68. GRB 080805: VLT redshift
  69. GRB 080805: Afterglow confirmation
  70. GRB 080805: GROND detection of possible afterglow
  71. GRB 080805: Swift detection of a burst
  72. GRB 080804: UVES redshift
  73. GRB 080804: Swift detection of a burst with optical afterglow
  74. GRB 080804: ROTSE-III Detection of Optical Counterpart
  75. GRB 080802: Swift/UVOT Upper Limits
  76. GRB 080802: Swift-XRT Refined Analysis
  77. GRB 080802: UVI Telescope Upper Limit
  78. GRB 080802, Swift-BAT refined analysis
  79. GRB 080802: Swift detection of a probable burst
  80. GRB 080727C: Suzaku WAM observation of the prompt emission
  81. GRB 080727B: IR photometry
  82. GRB 080727A: Early IR observations
  83. GRB 080727C: TAROT Calern observatory optical observations
  84. GRB 080727B: KAIT photometry and an early lightcurve break
  85. GRB 080727B: GROND redshift limit
  86. GRB 080727C, Swift-BAT refined analysis
  87. GRB 080727C: Swift/UVOT Upper Limits
  88. Konus-Wind observation of GRB 080727B
  89. GRB 080727C: Swift XRT refined analysis
  90. GRB 080727C: Liverpool Telescope observations
  91. GRB 080727A: VLT upper limits
  92. GRB 080727C: Enhanced Swift-XRT position
  93. GRB 080727B: REM NIR afterglow prompt detection
  94. GRB080727C: RTT150 optical observations
  95. GRB 080727C: Swift detection of a burst
  96. GRB 080727B: Swift/UVOT Upper Limits
  97. BAT Trigger 318150 is not a GRB
  98. GRB 080727B: Swift-XRT refined analysis
  99. GRB 080727B, Swift-BAT refined analysis
  100. GRB 080727A, Swift-BAT 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