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"

19666 results found.

  1. GRB 170710A: Swift-BAT refined analysis
  2. GRB 170710A: Swift-XRT refined Analysis
  3. GRB 170710A: Gemini-S candidate counterpart
  4. GRB 170710A: Enhanced Swift-XRT position
  5. GRB 170710A: Prompt enhanced Swift-XRT position
  6. GRB 170710A: Swift detection of a burst
  7. Correction to GCN Circular 21305: Trigger 760835: Swift misidentification of GRS1716-249
  8. Trigger 760835: Swift misidentification of GRS1716-249
  9. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  10. GRB 170705A: KAIT Optical Observations
  11. GRB 170705A: Insight-HXMT observation
  12. GRB 170705A: ISON/Terskol optical observations
  13. Konus-Wind observation of GRB 170705A
  14. GRB 170705A: Fermi GBM observation
  15. GRB 170705A: Swift-BAT refined analysis
  16. GRB 170705A: Swift/UVOT Detection
  17. GRB 170705A: RATIR Optical and NIR Observations
  18. GRB 170705A: Swift-XRT refined Analysis
  19. GRB 170705A: MASTER-OAFA early OT observations
  20. GRB 170705A: Enhanced Swift-XRT position
  21. GRB 170705A: Swift detection of a burst with an optical counterpart
  22. GRB 170629A: Swift-XRT refined Analysis
  23. GRB 170629A: Swift-BAT refined analysis
  24. GRB 170629A: Enhanced Swift-XRT position
  25. GRB 170629A: Fermi GBM observation
  26. GRB 170629A: Swift detection of a burst
  27. IPN Triangulation of GRB 170626B
  28. Konus-Wind observation of GRB 170626A
  29. GRB 170626A: TShAO optical observations
  30. GRB 170607A: 15 GHz upper limits from AMI
  31. GRB 170626A: Insight-HXMT observation
  32. GRB 170626A: MASTER-Tunka OT detection.
  33. GRB 170626A: Swift-BAT refined analysis
  34. GRB 170626A: Swift-XRT refined Analysis
  35. GRB 170626A: Fermi GBM observation
  36. GRB 170626A: Swift detection of a burst
  37. Swift trigger 758168 is probably not an astrophysical source
  38. Swift Trigger 758005 is Probably Not an Astrophysical Source
  39. Swift Trigger 756953: false identification by MASTER GCN 21250
  40. Swift Trigger 756953 is probably not an astrophysical source
  41. GRB170612.87 MASTER-Net OT detection
  42. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  43. Konus-Wind observation of GRB 170604A
  44. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  45. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  46. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  47. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  48. LIGO/Virgo G288732: Swift/BAT data search
  49. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  50. GRB 170607A: Swift-BAT refined analysis
  51. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  52. GRB 170607A: Swift/UVOT Detection
  53. GRB 170607A: MASTER-Tavrida early OT observations
  54. GRB 170607A: Fermi GBM observation
  55. GRB 170607A: Swift-XRT refined Analysis
  56. GRB 170607A: Enhanced Swift-XRT position
  57. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  58. GRB 170526A: 15 GHz upper limits from AMI
  59. GRB 170524A: 15 GHz upper limits from AMI
  60. GRB 170519A: 15 GHz upper limits from AMI
  61. GRB 170604A: Swift/UVOT Observations
  62. GRB 170604A: RATIR Optical and NIR Observations
  63. GRB 170604A: AbAO optical observations
  64. Swift trigger 755873: Swift BAT and XRT refined analysis
  65. GRB 170522A: confirmation of the X-ray afterglow
  66. GROND observations of GRB170604A
  67. Swift Trigger 755873: MASTER Net optical observations
  68. GRB 170604A: Swift-XRT refined Analysis
  69. GRB 170604A: Enhanced Swift-XRT position
  70. GRB 170604A: Swift-BAT refined analysis
  71. Swift Trigger 755873: D50 optical limits
  72. Swift Trigger 755873: a possible GRB
  73. GRB 170604A: Swift detection of a burst
  74. Trigger 755848: Swift spurious trigger on Cen X-3
  75. GRB 170531B: Swift/UVOT Detection
  76. GRB 170531B: Swift-BAT refined analysis
  77. GRB 170531A: Swift/UVOT Upper Limits
  78. GRB 170531B: LCO observations
  79. GRB 170531B: Swift-XRT refined Analysis
  80. GRB 170531A: MASTER Net job
  81. GRB 170531A: Swift-XRT refined Analysis
  82. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  83. GROND observations of GRB 170531B
  84. GRB 170531B: Redshift from GTC/OSIRIS
  85. GRB 170531B: Enhanced Swift-XRT position
  86. GRB 170531A: Swift/UVOT Observations
  87. GRB 170531B: Swift detection of a burst
  88. GRB 170531A: Swift detection of a burst
  89. GRB 170524B: Swift-UVOT/XRT Confirmation of Afterglow
  90. IPN Triangulation of GRB 170529A (long)
  91. GRB 170526A, Swift-BAT refined analysis
  92. GRB 170526A: Swift/UVOT Upper Limits
  93. GRB 170526A: Swift-XRT refined Analysis
  94. GRB 170524A: RATIR Optical and NIR Observations
  95. GRB 170526A: Enhanced Swift-XRT position
  96. GRB 170524B: Swift-XRT observations
  97. GRB 170526A: Swift detection of a burst
  98. Konus-Wind observation of GRB 170524B
  99. GRB 170524B: MASTER-OAFA observations
  100. GRB 170524A: TSHAO and CrAO optical observations

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