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.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19596 results found.

  1. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  2. GRB 181020A: Swift-XRT refined Analysis
  3. GRB 181020A: Fermi GBM detection
  4. GRB 181020A: Enhanced Swift-XRT position
  5. GRB 181020A: Fermi-LAT detection
  6. GRB 181020A: Swift detection of a burst with an optical counterpart
  7. Trigger 867343: Swift detection of SGR1806-20
  8. GRB 181016A: Swift-BAT refined analysis
  9. GRB 181016A: Swift detection of a burst
  10. GRB 181013A: AbAO optical upper limit
  11. Trigger 866993: Swift detection of SGR1806-20
  12. GRB 181013A: Swift/UVOT Upper Limits
  13. GRB 181013A: Swift-BAT refined analysis
  14. GRB 181013A: Swift-XRT afterglow detection
  15. GRB 181013A: Global MASTER Net optical observations
  16. GRB 181013A: Swift detection of a probable burst
  17. Swift Trigger 866757: is probably not a GRB
  18. GROND afterglow detection of GRB 181010A
  19. GRB 181010A: Swift-BAT refined analysis
  20. GRB 181010A: Fermi GBM observation
  21. IPN Triangulation of GRB 181008B (long)
  22. GRB 181010A: Swift/UVOT Detection
  23. GRB 181010A: Swift-XRT refined Analysis
  24. GRB 181010A: Enhanced Swift-XRT position
  25. GRB 181010A: LCO Cerro Tololo observations
  26. GRB 181010A: MASTER-Argentina OT detection
  27. GRB 181010A: Swift detection of a burst with an optical counterpart
  28. GRB 181002A: Mondy optical upper limit
  29. GRB 181003A: RATIR Optical and NIR Observations
  30. GRB 181003A: Swift-BAT refined analysis
  31. GRB 181003A: Swift-XRT afterglow detection
  32. GRB 180925A: Astrosat CZTI detection
  33. GRB 181003A: Swift/UVOT Upper Limits
  34. GRB 181002A: Swift-XRT refined Analysis
  35. GRB 181003A: LCO Cerro Tololo observations
  36. GRB 181003A: MASTER optical observation
  37. GRB181002A: GOTO optical limits
  38. GRB 181002A: Swift/UVOT Upper Limits
  39. GRB 181003A: Swift-XRT observations
  40. GRB 181003A: Swift detection of a burst
  41. GRB 181002A: Swift-BAT refined analysis
  42. GRB 181002A: MASTER optical observation
  43. GRB 181002A: Enhanced Swift-XRT position
  44. Konus-Wind observation of GRB 180925A
  45. GRB 181002A: Swift detection of a burst
  46. Trigger 864882: Swift detection of Crab in its normal state
  47. GRB 180930A: Swift-BAT refined analysis
  48. GRB 180930A: Swift-XRT refined Analysis
  49. GRB 180930A: Swift/UVOT Upper Limits
  50. GRB 180930A: Enhanced Swift-XRT position
  51. GRB 180930A: KAIT Optical Upper Limit
  52. GRB 180930A: Prompt enhanced Swift-XRT position
  53. GRB 180930A: Swift detection of a burst
  54. GRB 180924A: Swift/UVOT Upper Limits
  55. GRB 180925A: Insight-HXMT/HE detection
  56. GRB 180925A: Swift/UVOT Detection
  57. GRB 180925A: Swift-BAT refined analysis
  58. GRB 180925A: Swift-XRT refined Analysis
  59. GRB 180925A: Enhanced Swift-XRT position
  60. GRB 180925A: Prompt enhanced Swift-XRT position
  61. GRB 180925A: Swift detection of a burst
  62. GRB 180924A: MASTER inspection
  63. GRB 180924A: Swift-XRT refined Analysis
  64. GRB 180924A: Swift-BAT refined analysis
  65. GRB 180924A: Enhanced Swift-XRT position
  66. GRB 180924A: Swift detection of a burst
  67. Swift Trigger 863053 is not an astrophysical event
  68. GRB180914B: Swift UVOT position correction to circ. 23241
  69. GRB 180914B: AstroSat CZTI detection
  70. GRB 180914A: AstroSat CZTI detection
  71. GRB 180914B: AGILE/MCAL refined analysis
  72. GRB180914B: Swift UVOT detection of an optical afterglow
  73. GRB 180914B: RATIR Optical and NIR Observations
  74. GRB 180914B: KAIT Optical Afterglow Candidate
  75. GRB 180914B: Swift-XRT afterglow detection
  76. GRB 180914A: RATIR Optical and NIR Observations
  77. GRB 180914B: Tiled Swift observations
  78. GRB 180914B: Fermi-LAT detection
  79. GRB 180914A: Swift-XRT observations
  80. GRB 180914A: Tiled Swift observations
  81. GRB 180914A: Fermi-LAT detection
  82. GRB 180905A: Swift/UVOT Upper Limits
  83. GRB 180905A, Swift-BAT refined analysis
  84. GRB 180905A: RATIR Optical and NIR Observations
  85. GRB 180905A: Swift-XRT refined Analysis
  86. GRB 180904A: BOOTES-2/TELMA early observations
  87. GRB 180905A: BOOTES-3/YA optical observations
  88. GRB 180905A: Enhanced Swift-XRT position
  89. GRB 180904A: AbAO optical upper limit
  90. GRB 180904A: Swift/UVOT Upper Limits
  91. GRB 180904A: Swift-BAT refined analysis
  92. GRB 180905A: Swift detection of a burst
  93. GRB 180904A: Swift-XRT refined Analysis
  94. GRB 180904A: LT early observations
  95. GRB 180904A: SAO RAS optical observations
  96. GRB 180904A: OSN observations
  97. GRB 180904A: Enhanced Swift-XRT position
  98. GRB 180904A: Swift detection of a burst
  99. Konus-Wind observation of GRB 180828A
  100. GRB 180829A: Swift-XRT 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