Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

37766 results found.

  1. GRB 181020A: Swift/UVOT Detection
  2. GRB 181020A: Global MASTER Net OT observations
  3. GRB 181020A: LCO Cerro Tololo observations
  4. GRB 181020A: Swift-BAT refined analysis
  5. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  6. GRB 181018A: Insight-HXMT/HE detection
  7. GRB 181017A: Insight-HXMT/HE detection
  8. GRB 181020A: Swift-XRT refined Analysis
  9. GRB 181020A: Fermi GBM detection
  10. GRB 181020A: Enhanced Swift-XRT position
  11. GRB 181020A: Fermi-LAT detection
  12. GRB 181020A: Swift detection of a burst with an optical counterpart
  13. GRB 181014A: Insight-HXMT/HE detection
  14. Fermi GBM Observation of IceCube-181014A
  15. GRB 181011A: MITSuME Akeno and Okayama optical upper limits
  16. GRB 181016A: Swift-BAT refined analysis
  17. GRB 181016A: Swift detection of a burst
  18. GRB 181013A: AbAO optical upper limit
  19. Fermi-LAT Gamma-ray Observations of IceCube-181014A
  20. GRB 181013A: Swift/UVOT Upper Limits
  21. GRB 181013A: Swift-BAT refined analysis
  22. GRB 181013A: Swift-XRT afterglow detection
  23. GRB 181013A: Global MASTER Net optical observations
  24. GRB 181013A: Swift detection of a probable burst
  25. Swift Trigger 866757: is probably not a GRB
  26. GRB 181011A: Global MASTER Net optical inspection
  27. GRB 181011A: CALET Gamma-Ray Burst Monitor detection
  28. IPN Triangulation of GRB 181011A (long)
  29. GRB 181011A: MAXI/GSC detection
  30. GROND afterglow detection of GRB 181010A
  31. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  32. GRB 181010A: REM optical and NIR afterglow detection
  33. GRB 181008B: Global MASTER Net optical inspection
  34. GRB 181010A: Swift-BAT refined analysis
  35. GRB 181010A: Fermi GBM observation
  36. GRB 181010A: ePESSTO NTT optical observations
  37. IPN Triangulation of GRB 181008B (long)
  38. GRB 181010A: Swift/UVOT Detection
  39. GRB 181010A: Swift-XRT refined Analysis
  40. GRB 181010A: VLT/X-shooter redshift
  41. GRB 181008A: Insight-HXMT/HE detection
  42. GRB 181010A: Enhanced Swift-XRT position
  43. GRB 181010A: RATIR Optical and NIR Afterglow Detection
  44. GRB 181010A: LCO Cerro Tololo observations
  45. GRB 181010A: MASTER-Argentina OT detection
  46. GRB 181010A: Swift detection of a burst with an optical counterpart
  47. GRB 181002A: Mondy optical upper limit
  48. GRB 181003A: RATIR Optical and NIR Observations
  49. GRB 181003A: Swift-BAT refined analysis
  50. GRB 181003A: Swift-XRT afterglow detection
  51. GRB 180925A: Astrosat CZTI detection
  52. GRB 181003A: Swift/UVOT Upper Limits
  53. GRB 180930A: TSHAO optical upper limit
  54. GRB 181002A: Swift-XRT refined Analysis
  55. GRB 181003A: LCO Cerro Tololo observations
  56. GRB 181003A: MASTER optical observation
  57. GRB181002A: GOTO optical limits
  58. GRB 181002A: Swift/UVOT Upper Limits
  59. GRB 181003A: Swift-XRT observations
  60. GRB 181003A: Swift detection of a burst
  61. GRB 181002A: Swift-BAT refined analysis
  62. GRB 181002A: MASTER optical observation
  63. GRB 181002A: Enhanced Swift-XRT position
  64. Konus-Wind observation of GRB 180925A
  65. GRB 181002A: Swift detection of a burst
  66. GRB 180914B: RTT150 optical observations
  67. GRB 180914B: RTT150 optical observations
  68. GRB 180930A: Swift-BAT refined analysis
  69. GRB 180930A: Swift-XRT refined Analysis
  70. GRB 180930A: NOT optical upper limits
  71. GRB 180930A: Swift/UVOT Upper Limits
  72. GRB 180930A: Enhanced Swift-XRT position
  73. GRB 180930A: KAIT Optical Upper Limit
  74. GRB 180930A: Prompt enhanced Swift-XRT position
  75. GRB 180930A: Swift detection of a burst
  76. INTEGRAL detections of the prompt gamma-ray emission of GRB 180914B
  77. GRB 180924A: Swift/UVOT Upper Limits
  78. GRB 180925A: VLT optical observations
  79. GRB 180925A: Insight-HXMT/HE detection
  80. GRB 180925A: Swift/UVOT Detection
  81. GRB 180925A: Swift-BAT refined analysis
  82. GRB 180925A: Swift-XRT refined Analysis
  83. GRB 180925A: Enhanced Swift-XRT position
  84. GRB 180925A: Prompt enhanced Swift-XRT position
  85. Konus-Wind observation of GRB 180923A
  86. GRB 180925A: Swift detection of a burst
  87. GRB 180924A: MASTER inspection
  88. GRB 180924A: Swift-XRT refined Analysis
  89. GRB 180923B - GBM Correction to GCN 23263
  90. GRB 180924A: Swift-BAT refined analysis
  91. GRB 180923B: Fermi GBM detection
  92. GRB 180924A: Enhanced Swift-XRT position
  93. GRB 180924A: Swift detection of a burst
  94. GRB 180923A: CALET Gamma-Ray Burst Monitor detection
  95. GRB 180923A: MASTER inspection MAXI/GSC error box
  96. GRB 180923A: MAXI/GSC detection
  97. GRB 180914B: OSN Detection and light curve/SED analysis
  98. GRB 180914B: OAJ multi-color follow-up
  99. Konus-Wind observation of GRB 180914A
  100. GRB 180914B: DDOTI/OAN Detection and Confirmation of Fading

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