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"

36116 results found.

  1. Fermi GBM trigger 524493492/170815526 is not a GRB
  2. LIGO/Virgo G297595: Pan-STARRS coverage and transients over the first 5hrs
  3. LIGO/Virgo G297595: Insight-HXMT observations
  4. LIGO/Virgo G297595: Swift/BAT data search
  5. GRB 170813A: Swift/UVOT Upper Limits
  6. GRB 170813A: Swift-BAT refined analysis
  7. GRB 170813A: RATIR Optical and NIR Observations
  8. GRB 170810A: AbAO optical upper limit
  9. GRB 170813A: Swift-XRT refined Analysis
  10. GRB 170813A: Enhanced Swift-XRT position
  11. GRB 170813A: Swift detection of a burst
  12. GRB 170728B: 15 GHz upper limits from AMI
  13. GRB 170728A: 15 GHz upper limits from AMI
  14. GRB 170714A: 15 GHz upper limits from AMI
  15. GRB 170711A: 15 GHz upper limits from AMI
  16. GRB 170710C: 15 GHz upper limits from AMI
  17. GRB 170710B: 15 GHz upper limits from AMI
  18. GRB 170626A: 15 GHz upper limits from AMI
  19. GRB 170810A: Swift-BAT refined analysis
  20. LIGO/Virgo G296853: Insight-HXMT observations
  21. GRB 170810A: Swift-XRT refined Analysis
  22. GRB 170810A: Swift/UVOT Detection
  23. GRB 170810A: Fermi GBM observation
  24. GRB 170810A: Fermi-LAT detection
  25. GRB 170810A: Enhanced Swift-XRT position
  26. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  27. GRB 170810A: MASTER-NET very bright OT detection
  28. Konus-Wind observation of GRB 170808B
  29. GRB 170805B: Insight-HXMT observation
  30. GRB 170803B: Insight-HXMT detection
  31. Konus-Wind observation of GRB 170805B
  32. GMRT upper limit on the radio afterglow of GRB 170728B
  33. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  34. LIGO/Virgo G296853: Fermi GBM Observations
  35. LIGO/Virgo G296853: Swift/BAT data search
  36. GRB 170808B: Fermi LAT Detection
  37. GRB 170808B: Fermi GBM observation
  38. IPN Triangulation of GRB 170805B (short/hard)
  39. IPN Triangulation of GRB 170805A (short)
  40. GRB 170801A: Insight-HXMT detection
  41. Konus-Wind observation of GRB 170724A
  42. GRB 170714A: ATCA detection of the radio counterpart
  43. GRB 170807A: Swift-BAT refined analysis
  44. GRB 170808A: MAXI/GSC detection
  45. GRB 170805A: Insight-HXMT detection
  46. GRB 170807A: Swift detection of a burst
  47. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  48. GRB 170803A: Swift/BAT spectral lag results
  49. GRB 170804A: LCO Observations
  50. GRB 170804A: Swift-BAT refined analysis
  51. GRB 170804A: Swift/UVOT Detection
  52. GRB 170804A: Swift-XRT refined Analysis
  53. GRB 170804A: Enhanced Swift-XRT position
  54. GRB 170803A: Swift-BAT refined analysis
  55. GRB 170803A: Swift/UVOT Detection
  56. GRB 170804A: Swift detection of a burst with optical counterpart
  57. Swift Trigger 766161 is not a GRB
  58. GRB 170803A: Swift-XRT refined Analysis
  59. GRB 170803A: Enhanced Swift-XRT position
  60. GRB 170803A: Fermi GBM observation
  61. GRB 170803A: Swift detection of a burst with an optical counterpart
  62. GRB 170802A: Fermi GBM detection
  63. GRB 160814A: Lomonosov BDRG gamma ray discovery
  64. GRB 170728B: time correction to MASTER GCN Circular 21391
  65. GRB 170728B: Swift/UVOT Further Analysis
  66. Konus-Wind observation of GRB 170728B
  67. GRB 170726A: AstroSat CZTI detection
  68. GRB 170714A: Chandra observations
  69. GRB 170728B: VLA radio afterglow detection
  70. GRB 170728B: Optical observations at Crni Vrh
  71. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  72. GRB170730A detecetd by INTEGRAL. Refined analysis
  73. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  74. IBAS weak Alert nr.7881: possible GRB 170730A
  75. GRB 170728B: COATLI Observations And Confirmation of Fading
  76. GRB 170728B: Swift/UVOT Upper Limits
  77. GRB 170728B iTelescope observation
  78. GRB 170728A: Swift/UVOT Detection
  79. Swift J181723.1-164300: Swift-BAT refined analysis
  80. GRB 170728B, Swift-BAT refined analysis
  81. GRB 170728B: Fermi GBM detection
  82. GRB 170728A: LCO observations
  83. GRB 170728B: I-band detection from 1.5m OSN
  84. GRB 170728B: Fermi-LAT detection
  85. GRB170714A: XMM observation of the afterglow
  86. GRB 170728A: Swift-XRT refined Analysis
  87. GRB 170728B: Enhanced Swift-XRT position
  88. GRB 170728B: Swift-XRT refined Analysis
  89. GRB 170728B: LT afterglow confirmation
  90. GRB 170728B: NOT optical afterglow confirmation
  91. GRB 170728B: position of the TNG optical counterpart
  92. GRB 170728B: TNG optical afterglow candidate
  93. GRB 170728B: Swift detection of a short burst
  94. GRB 170728A: Swift-BAT refined analysis
  95. Swift triggers on a new galactic source: Swift J181723.1-164300
  96. GRB 170728A: Enhanced Swift-XRT position
  97. GRB 170728A: Swift detection of a burst
  98. GRB 170726A: Insight-HXMT detection
  99. GRB 170724A, Swift-BAT refined analysis
  100. GRB 170724A: Swift detection of a burst

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