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"

36016 results found.

  1. GRB 181103A: Swift-XRT refined Analysis
  2. GRB 181103A: Enhanced Swift-XRT position
  3. GRB 181103A: Swift detection of a burst
  4. GRB 181030A: Swift/UVOT Detection
  5. GRB 181028A: CALET Gamma-Ray Burst Monitor detection
  6. GRB 181030A, Swift-BAT refined analysis
  7. GRB 181030A: RATIR Optical and NIR Observations
  8. GRB 181026A: AstroSat CZTI detection
  9. GRB 181030A: Swift-XRT refined Analysis
  10. Konus-Wind observation of GRB 181028A
  11. GRB 181030A: MASTER Net OT detection
  12. GRB 181030A: Enhanced Swift-XRT position
  13. GRB 181030A: SAO RAS optical observations
  14. GRB 181030A: Swift detection of a burst with a possible optical counterpart
  15. IPN Triangulation of GRB 181028A (long)
  16. GRB 181028A: Fermi GBM observation
  17. GRB 181028A: Fermi-LAT detection
  18. GRB 181027A: Fermi GBM detection
  19. GRB 181027A: Swift-BAT refined analysis
  20. GRB 181027A: Swift detection of a burst
  21. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  22. GRB 181023A: Swift-BAT refined analysis
  23. GRB 181023A: Swift/UVOT Upper Limits
  24. GRB 181022A: Swift-XRT refined Analysis
  25. GRB 181023A: Swift-XRT refined Analysis
  26. GRB 181022A: MITSuME Akeno optical upper limits
  27. GRB 181022A: GROND upper limits
  28. GRB 181022A: LCO Sutherland observations
  29. GRB 181023A: Enhanced Swift-XRT position
  30. GRB 181023A: KAIT Optical Upper Limit
  31. GRB 181022A: Swift/UVOT Upper Limits
  32. GRB 181023A: Swift detection of a burst
  33. GRB 181022A: Swift-BAT refined analysis
  34. GRB 181022A: Swift detection of a burst
  35. Konus-Wind observation of GRB 181020A
  36. GRB 181020A: REM detection
  37. GRB 181020A: Swift/UVOT Detection
  38. GRB 181020A: Global MASTER Net OT observations
  39. GRB 181020A: LCO Cerro Tololo observations
  40. GRB 181020A: Swift-BAT refined analysis
  41. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  42. GRB 181018A: Insight-HXMT/HE detection
  43. GRB 181017A: Insight-HXMT/HE detection
  44. GRB 181020A: Swift-XRT refined Analysis
  45. GRB 181020A: Fermi GBM detection
  46. GRB 181020A: Enhanced Swift-XRT position
  47. GRB 181020A: Fermi-LAT detection
  48. GRB 181020A: Swift detection of a burst with an optical counterpart
  49. GRB 181014A: Insight-HXMT/HE detection
  50. GRB 181011A: MITSuME Akeno and Okayama optical upper limits
  51. GRB 181016A: Swift-BAT refined analysis
  52. GRB 181016A: Swift detection of a burst
  53. GRB 181013A: AbAO optical upper limit
  54. GRB 181013A: Swift/UVOT Upper Limits
  55. GRB 181013A: Swift-BAT refined analysis
  56. GRB 181013A: Swift-XRT afterglow detection
  57. GRB 181013A: Global MASTER Net optical observations
  58. GRB 181013A: Swift detection of a probable burst
  59. Swift Trigger 866757: is probably not a GRB
  60. GRB 181011A: Global MASTER Net optical inspection
  61. GRB 181011A: CALET Gamma-Ray Burst Monitor detection
  62. IPN Triangulation of GRB 181011A (long)
  63. GRB 181011A: MAXI/GSC detection
  64. GROND afterglow detection of GRB 181010A
  65. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  66. GRB 181010A: REM optical and NIR afterglow detection
  67. GRB 181008B: Global MASTER Net optical inspection
  68. GRB 181010A: Swift-BAT refined analysis
  69. GRB 181010A: Fermi GBM observation
  70. GRB 181010A: ePESSTO NTT optical observations
  71. IPN Triangulation of GRB 181008B (long)
  72. GRB 181010A: Swift/UVOT Detection
  73. GRB 181010A: Swift-XRT refined Analysis
  74. GRB 181010A: VLT/X-shooter redshift
  75. GRB 181008A: Insight-HXMT/HE detection
  76. GRB 181010A: Enhanced Swift-XRT position
  77. GRB 181010A: RATIR Optical and NIR Afterglow Detection
  78. GRB 181010A: LCO Cerro Tololo observations
  79. GRB 181010A: MASTER-Argentina OT detection
  80. GRB 181010A: Swift detection of a burst with an optical counterpart
  81. GRB 181002A: Mondy optical upper limit
  82. GRB 181003A: RATIR Optical and NIR Observations
  83. GRB 181003A: Swift-BAT refined analysis
  84. GRB 181003A: Swift-XRT afterglow detection
  85. GRB 180925A: Astrosat CZTI detection
  86. GRB 181003A: Swift/UVOT Upper Limits
  87. GRB 180930A: TSHAO optical upper limit
  88. GRB 181002A: Swift-XRT refined Analysis
  89. GRB 181003A: LCO Cerro Tololo observations
  90. GRB 181003A: MASTER optical observation
  91. GRB181002A: GOTO optical limits
  92. GRB 181002A: Swift/UVOT Upper Limits
  93. GRB 181003A: Swift-XRT observations
  94. GRB 181003A: Swift detection of a burst
  95. GRB 181002A: Swift-BAT refined analysis
  96. GRB 181002A: MASTER optical observation
  97. GRB 181002A: Enhanced Swift-XRT position
  98. Konus-Wind observation of GRB 180925A
  99. GRB 181002A: Swift detection of a burst
  100. GRB 180914B: RTT150 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