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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.

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"

19548 results found.

  1. GRB 170728B: I-band detection from 1.5m OSN
  2. GRB170714A: XMM observation of the afterglow
  3. GRB 170728B: Enhanced Swift-XRT position
  4. GRB 170728B: Swift-XRT refined Analysis
  5. GRB 170728B: NOT optical afterglow confirmation
  6. GRB 170728B: TNG optical afterglow candidate
  7. GRB 170728B: Swift detection of a short burst
  8. GRB 170728A: Swift-BAT refined analysis
  9. Swift triggers on a new galactic source: Swift J181723.1-164300
  10. GRB 170728A: Enhanced Swift-XRT position
  11. GRB 170728A: Swift detection of a burst
  12. GRB 170726A: Insight-HXMT detection
  13. Trigger 763539 from Swift is probably not astrophysical
  14. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  15. LIGO/Virgo G275697: LOFAR follow-up
  16. GRB 170710B: Further Swift-XRT observations
  17. GRB 170714A: Swift/UVOT Observations
  18. GRB 170714A: TNG NIR observations
  19. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  20. GRB 170714B: Insight-HXMT detection
  21. GRB 170714A: Swift-XRT refined Analysis
  22. GRB 170714A: Enhanced Swift-XRT position
  23. GRB 170714A: Swift detection of a burst
  24. GRB 170708B CALET Gamma-Ray Burst Monitor detection
  25. GRB 170702A CALET Gamma-Ray Burst Monitor detection
  26. GRB 170711A: ISON/Terskol and AbAO optical observations
  27. GRB 170711A: Swift/UVOT Upper Limits
  28. GRB 170711A: RATIR Optical and NIR Observations
  29. GRB 170711A: Enhanced Swift-XRT position
  30. GRB 170711A: Swift detection of a burst
  31. GRB 170705A: TShAO optical observations
  32. GRB 170710B: Swift ToO observations
  33. GRB170710A: Swift/UVOT detection
  34. GRB 170710A: Swift-XRT refined Analysis
  35. GRB 170710A: Gemini-S candidate counterpart
  36. GRB 170710A: Enhanced Swift-XRT position
  37. GRB 170710A: Swift detection of a burst
  38. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  39. GRB 170705A: Insight-HXMT observation
  40. GRB 170705A: ISON/Terskol optical observations
  41. GRB 170705A: Redshift from 10.4m GTC/OSIRIS
  42. GRB 170705A: Swift/UVOT Detection
  43. GRB 170705A: RATIR Optical and NIR Observations
  44. GRB 170705A: Swift-XRT refined Analysis
  45. GRB 170705A: Enhanced Swift-XRT position
  46. GRB 170705A: Swift detection of a burst with an optical counterpart
  47. GRB 170629A: Enhanced Swift-XRT position
  48. GRB 170629A: Swift detection of a burst
  49. IPN Triangulation of GRB 170626B
  50. Konus-Wind observation of GRB 170626A
  51. GRB 170626A: SAO RAS confirmation of OT fading
  52. GRB 170626A: TShAO optical observations
  53. GRB 170626A: OASDG optical observations
  54. GRB 170626A: TNG optical observations
  55. GRB 170626A: Afterglow detection from 1.5m OSN
  56. GRB 170626A: SAO RAS possible OT detection
  57. GRB 170626A: Swift detection of a burst
  58. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  59. LIGO/Virgo G288732: Pan-STARRS coverage of the Fermi/LAT candidate position
  60. Swift trigger 758168 is probably not an astrophysical source
  61. Swift Trigger 758005 is Probably Not an Astrophysical Source
  62. GRB 170607A CALET Gamma-Ray Burst Monitor detection
  63. GRB 170606A CALET Gamma-Ray Burst Monitor detection
  64. Swift Trigger 756953 is probably not an astrophysical source
  65. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  66. LIGO/Virgo G288732: HAWC follow-up
  67. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  68. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  69. LIGO/Virgo G288732 : MAXI/GSC observations
  70. GRB 170607A: Redshift from GTC/OSIRIS
  71. GRB 170607A: ISON/Terskol optical observations
  72. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  73. LIGO/Virgo G288732: Swift/BAT data search
  74. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  75. LIGO/Virgo G288732: INTEGRAL search for a prompt gamma-ray counterpart
  76. LIGO/Virgo G288732:SVOM/Mini-GWAC observations of the initial skymap
  77. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  78. GRB 170607A: Correction on the possible host galaxy identification
  79. LIGO/Virgo G288732 ANTARES search
  80. LIGO/VIRGO G288732: Fermi GBM Observations
  81. GRB 170607A: Swift/UVOT Detection
  82. GRB 170607A: MASTER-Tavrida early OT observations
  83. GRB 170607A: NOT optical afterglow detection
  84. GRB 170607A: Swift-XRT refined Analysis
  85. GRB 170607A: Enhanced Swift-XRT position
  86. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  87. GRB 170531B: Zeiss-1000/CrAO optical observations
  88. GRB 170519A: TShAO and AbAO optical observations
  89. GRB 170604A: Swift/UVOT Observations
  90. GRB 170519A: Mondy optical observations
  91. GRB 170604A: RATIR Optical and NIR Observations
  92. GRB 170604A: AbAO optical observations
  93. GRB 170522A: confirmation of the X-ray afterglow
  94. GROND observations of GRB170604A
  95. GRB 170604A: Swift-XRT refined Analysis
  96. GRB 170604A: GTC spectroscopic redshift
  97. GRB 170604A: Enhanced Swift-XRT position
  98. GRB 170604A: Swift-BAT refined analysis
  99. Swift Trigger 755873: a possible GRB
  100. GRB 170604A: optical observations

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