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"

19666 results found.

  1. GRB 171211A: Enhanced Swift-XRT position
  2. GRB 171210A: Swift-XRT and UVOT observations
  3. GRB 171211A: Swift detection of a possibly short burst
  4. GRB 171210A: Swift ToO observations
  5. Correction to GCN 22184: GRB 171205A: Swift-BAT refined analysis
  6. GRB 171209A: Swift-BAT refined analysis
  7. GRB 171210A: Fermi-LAT detection
  8. Konus-Wind observation of GRB 171205A
  9. GRB 171205A: MASTER-Net OT recent photometry
  10. GRB 171209A: Swift/UVOT Analysis of the burst
  11. Swift trigger 796115 is not astrophysical
  12. GRB 171209A: Swift-XRT refined Analysis
  13. GRB 171209A: Enhanced Swift-XRT position
  14. Swift Trigger 796115 is probably not a GRB
  15. GRB 171205A: VLA detection
  16. GRB 171209A: LCO 1-m telescope observations
  17. GRB 171209A: Swift detection of a burst
  18. Swift Trigger 796098 is probably a noise peak near M31
  19. GRB 171205A: Continued Swift/UVOT Observations
  20. GRB 171205A: MASTER-SAAO optical observations of unusual OT
  21. GRB 171205A: GROND observations of the optical/NIR transient
  22. GRB 171205A: LCO 1-m telescope observations
  23. Possible blackbody component in the X-ray spectrum of GRB171205A
  24. GRB 171205A: Swift-BAT refined analysis
  25. GRB 171205A: Swift-XRT refined Analysis
  26. GRB 171205A: Swift/UVOT Detection
  27. GRB 171205A: Enhanced Swift-XRT position
  28. GRB 171205A: Swift detection of a burst
  29. GRB 171124A: Swift-XRT afterglow detection
  30. LIGO/Virgo G299232: LOFAR follow-up
  31. GRB 171123A: TShAO optical upper limit
  32. GRB 171124A: Swift-XRT observations
  33. GRB 171123A: RATIR Optical and NIR Observations
  34. GRB 171123A: Swift/UVOT Upper Limits
  35. GRB 171124A: Fermi-LAT detection
  36. GRB 171124A: Swift ToO observations
  37. GRB 171123A: Swift-BAT refined analysis
  38. GRB 171123A: Swift-XRT refined Analysis
  39. GRB 171123A: Confirmation of the X-ray afterglow
  40. GRB 171123A: Enhanced Swift-XRT position
  41. GRB 171120A: Insight-HXMT detection
  42. GRB 171123A: Swift detection of a burst
  43. GRB 171120A: Swift/UVOT Upper Limits
  44. GRB 171120A: AstroSat CZTI detection
  45. Konus-Wind observation of GRB 171120A
  46. GRB 171120A: Swift-BAT refined analysis
  47. GRB 171120A: Fermi GBM Detection
  48. GRB 171120A: Swift-XRT refined Analysis
  49. GRB 171120A: Fermi-LAT detection
  50. GRB 171120A: Enhanced Swift-XRT position
  51. GRB 171120A: Swift detection of a burst
  52. Fermi-LAT Gamma-ray Observations of IceCube-171106A
  53. GRB 171115A: RATIR Optical and NIR Observations
  54. GRB 171115A: Swift-BAT refined analysis
  55. GRB 171115A: Swift-XRT refined Analysis
  56. GRB 171115A: Enhanced Swift-XRT position
  57. GRB 171115A: Swift detection of a burst
  58. FACT follow-up of IceCube20171106
  59. IPN Triangulation of GRB 171108A (short)
  60. GRB 171103A: Insight-HXMT observation
  61. IceCube-171106A: Swift Observations
  62. GRB 171010A: afterglow and SN 2017htp optical observations
  63. Fermi-GBM Trigger 531686417 / 171106778 is not related to ICECUBE-171106A
  64. GRB 171103A: AstroSat CZTI detection
  65. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  66. Konus-Wind observation of GRB 171103A (short/hard)
  67. GRB 171103A: Fermi GBM observation
  68. GRB 171103A: Swift-BAT refined analysis of a short GRB
  69. Fermi GBM detections of Swift J0243.6+6124 and modification of the GBM trigger configuration
  70. GRB 171103A: Swift detection of a short hard burst
  71. GRB 171102B: AbAO optical upper limit
  72. GRB 171102B: TShAO optical upper limit
  73. IPN Triangulation of GRB 171102A
  74. GRB 171102B: RATIR Optical and NIR Observations
  75. GRB 171102B: Swift-BAT refined analysis
  76. GRB 171102B: Swift/UVOT Upper Limits
  77. GRB 171102B: Swift-XRT refined Analysis
  78. GRB 171102B: Enhanced Swift-XRT position
  79. GRB 171102B: Swift detection of a burst
  80. GRB 171102A: Fermi-LAT detection
  81. GRB 171030A: IPN error box through NSs probability merging rate map
  82. GRB 171030A: Fermi GBM detection
  83. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  84. GRB 171030A: Swift ToO observations
  85. IPN Triangulation of GRB 171030A (short)
  86. Fermi-GBM triggers due to Swift J0243.6+6124
  87. Swift Trigger 783893: KAIT Optical Observations
  88. GRB 171027A: KAIT Optical Upper Limit
  89. Swift Triggers 784159 and 784160 are not bursts
  90. Konus-Wind observation of GRB 171027A
  91. AMI-LA observations of the new Be X-ray binary Swift J0243.6+6124
  92. Swift Trigger 783893: LCO 1-m telescope observations
  93. Swift Trigger 783893 is probably not a GRB
  94. GRB 171027A, Swift-BAT refined analysis
  95. GRB 171027A: Swift/UVOT Upper Limits
  96. GRB 171027A: Swift-XRT refined Analysis
  97. GRB 171027A: Enhanced Swift-XRT position
  98. GRB 171027A: LCO 1-m telescope observations
  99. GROND observations of GRB 171027A: correction
  100. GRB 171027A: RATIR Detection of a NIR Afterglow Candidate

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