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"

36146 results found.

  1. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  2. GRB170730A detecetd by INTEGRAL. Refined analysis
  3. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  4. IBAS weak Alert nr.7881: possible GRB 170730A
  5. GRB 170728B: COATLI Observations And Confirmation of Fading
  6. GRB 170728B: Swift/UVOT Upper Limits
  7. GRB 170728B iTelescope observation
  8. GRB 170728A: Swift/UVOT Detection
  9. Swift J181723.1-164300: Swift-BAT refined analysis
  10. GRB 170728B, Swift-BAT refined analysis
  11. GRB 170728B: Fermi GBM detection
  12. GRB 170728A: LCO observations
  13. GRB 170728B: I-band detection from 1.5m OSN
  14. GRB 170728B: Fermi-LAT detection
  15. GRB170714A: XMM observation of the afterglow
  16. GRB 170728A: Swift-XRT refined Analysis
  17. GRB 170728B: Enhanced Swift-XRT position
  18. GRB 170728B: Swift-XRT refined Analysis
  19. GRB 170728B: LT afterglow confirmation
  20. GRB 170728B: NOT optical afterglow confirmation
  21. GRB 170728B: position of the TNG optical counterpart
  22. GRB 170728B: TNG optical afterglow candidate
  23. GRB 170728B: Swift detection of a short burst
  24. GRB 170728A: Swift-BAT refined analysis
  25. Swift triggers on a new galactic source: Swift J181723.1-164300
  26. GRB 170728A: Enhanced Swift-XRT position
  27. GRB 170728A: Swift detection of a burst
  28. GRB 170726A: Insight-HXMT detection
  29. GRB 170724A, Swift-BAT refined analysis
  30. GRB 170724A: Swift detection of a burst
  31. Fermi GBM trigger 522477026/170723188 is not a GRB
  32. Fermi GBM trigger 522470841/170723116 is not a GRB
  33. Fermi GBM trigger 522334209/170721535 is not a GRB
  34. GRB170714A: ATCA observation
  35. GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC
  36. Fermi GBM trigger 522048561/170718229 is not a GRB
  37. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  38. GRB 170710B: Further Swift-XRT observations
  39. Correction to GCN Circular 21351: GRB 170714A: Swift/UVOT Observations
  40. GRB 170714A: Swift/UVOT Observations
  41. GRB 170714A: TNG NIR observations
  42. Fermi GBM trigger 521905898/170716577 is not a GRB
  43. GRB 170702A: AstroSat CZTI detection
  44. GRB 170714A, Swift-BAT refined analysis
  45. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  46. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  47. GRB 170714B: Insight-HXMT detection
  48. GRB 170714A: Swift-XRT refined Analysis
  49. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  50. GRB 170714A: Enhanced Swift-XRT position
  51. GRB 170714A: Swift detection of a burst
  52. GRB 170712A: AstroSat CZTI detection
  53. Correction to GCN Circular 21337: GRB 170710D CALET Gamma-Ray Burst Monitor detection
  54. GRB 170710D CALET Gamma-Ray Burst Monitor detection
  55. GRB 170708B CALET Gamma-Ray Burst Monitor detection
  56. GRB 170703A CALET Gamma-Ray Burst Monitor detection
  57. GRB 170702A CALET Gamma-Ray Burst Monitor detection
  58. GRB 170711A: ISON/Terskol and AbAO optical observations
  59. GRB 170712A: Insight-HXMT detection
  60. GRB 170711A: Swift-BAT refined analysis
  61. Konus-Wind observation of GRB 170708A
  62. GRB 170711A: Swift/UVOT Upper Limits
  63. GRB 170711A: RATIR Optical and NIR Observations
  64. GRB 170705A: AstroSat CZTI detection
  65. GRB 170710C: a long GRB detected by INTEGRAL
  66. GRB 170711A: Swift-XRT refined Analysis
  67. GRB 170711A: Fermi GBM observation
  68. GRB 170711A: Enhanced Swift-XRT position
  69. GRB 170711A: Prompt enhanced Swift-XRT position
  70. GRB 170711A: Swift detection of a burst
  71. GRB 170705A: TShAO optical observations
  72. GRB 170710B: Fermi GBM observation
  73. GRB 170710B: Swift-XRT and UVOT observations
  74. GRB 170710B: Swift ToO observations
  75. GRB 170710B: Swift detection of a burst
  76. GRB170710A: Swift/UVOT detection
  77. IPN Triangulation of GRB 170708A (short)
  78. GRB 170710A: Swift-BAT refined analysis
  79. GRB 170710A: Swift-XRT refined Analysis
  80. GRB 170710A: Gemini-S candidate counterpart
  81. GRB 170710A: Enhanced Swift-XRT position
  82. GRB 170710A: Prompt enhanced Swift-XRT position
  83. GRB 170710A: Swift detection of a burst
  84. GRB 170708A: Insight-HXMT detection
  85. LIGO/Virgo G288732: Konus-Wind observations
  86. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  87. GRB 170705A: KAIT Optical Observations
  88. GRB 170705A: Insight-HXMT observation
  89. GRB 170705A: ISON/Terskol optical observations
  90. Konus-Wind observation of GRB 170705A
  91. GRB 170705A: Redshift from 10.4m GTC/OSIRIS
  92. GRB 170705A: Fermi GBM observation
  93. GRB 170705A: Swift-BAT refined analysis
  94. GRB 170705A: MITSuME Akeno Optical Observation
  95. GRB 170705A: Swift/UVOT Detection
  96. GRB 170705A: RATIR Optical and NIR Observations
  97. GRB 170705A: Swift-XRT refined Analysis
  98. GRB 170705A: MASTER-OAFA early OT observations
  99. GRB 170705A: Enhanced Swift-XRT position
  100. GRB 170705A: Swift detection of a burst with an optical counterpart

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