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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"

4180 results found.

  1. GRB 171211A: Swift detection of a possibly short burst
  2. GRB 171205A: iTelescope optical observations
  3. Swift Trigger 796098 is probably a noise peak near M31
  4. GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
  5. GRB 171102B: Swift detection of a burst
  6. GRB 171030A: Fermi GBM detection
  7. GRB 171030A: Swift non-localization with BAT, XRT and UVOT
  8. IPN Triangulation of GRB 171030A (short)
  9. Swift Triggers 784159 and 784160 are not bursts
  10. Swift Trigger 783893: LCO 1-m telescope observations
  11. Swift Trigger 783893 is probably not a GRB
  12. GRB 171027A: LCO 1-m telescope observations
  13. GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
  14. IPN Triangulation of GRB 171022A
  15. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  16. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  17. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  18. Trigger 779351: Swift detection of Swift J0243.6+6124
  19. GRB 171010A: MITSuME Akeno Optical Observation
  20. LIGO/Virgo G299232: MAGIC Cherenkov Telescopes observations
  21. LIGO/Virgo G298048: Record of all e-MERLIN results to date on SSS17a
  22. GRB 170728B: Kottamia R-band observation
  23. LIGO/Virgo G298048: Summary of Pi of the Sky observations
  24. LIGO/Virgo G297595: NIR Observations following GW170814
  25. LIGO/Virgo G299232: Swift-XRT sources
  26. GRB 170829A: Insight-HXMT detection
  27. IPN Triangulation of GRB 170904A (long/very bright)
  28. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  29. LIGO/Virgo G298048: Possible Plateau in Ks band revealed by continued Gemini-South observations
  30. LIGO/Virgo G299232: GRAWITA Asiago optical observations
  31. LIGO/Virgo G299232: SVOM/2.16-m Optical Telescope Observations of Swift UVOT Transient
  32. GRB 170830A: MAXI/GSC detection
  33. LIGO/Virgo G299232: WHT non-detection u-band optical transient
  34. LIGO/Virgo G299232: Liverpool Telescope observations
  35. LIGO/Virgo G299232/PGWB170825.55: early MASTER observations of the Swift UVOT source position
  36. LIGO/Virgo G296853: PIRATE observations
  37. GRB170827A: Further GROND follow-up observations
  38. LIGO/Virgo G299232 TZAC/TAROT observations
  39. LIGO/Virgo G298936: Astrosat CZTI upper limits
  40. LIGO/Virgo G299232: Astrosat CZTI upper limits
  41. LIGO/Virgo G298936 TAROT/TZAC observations
  42. LIGO/Virgo G298048: MASTER Global-Net early optical observations and the Possible KiloNova SSS17a in NGC 4993 photometry and merging rate
  43. LIGO/Virgo G298389 : MAXI/GSC observations
  44. LIGO/Virgo G298048: HSC observations of the OT candidate of G298048
  45. LIGO/Virgo G298048: TZAC TAROT Reunion (TRE) observations
  46. LIGO/Virgo G298048: REM optical/NIR observations
  47. LIGO/Virgo G298048: Subaru HSC follow-up observations
  48. LIGO/Virgo G298048: REM optical/NIR observations of candidate in NGC 4993
  49. LIGO/Virgo G298048: Potential host galaxies from the GLADE catalog
  50. LIGO/Virgo G298048: Astrosat CZTI upper limits
  51. LIGO/Virgo G296853 TZAC TAROT observations
  52. LIGO/Virgo G297595: MASTER MASTER Bright PSN detection in error-box
  53. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  54. LIGO/Virgo G297595: REM optical/NIR observations
  55. GRB 170813A: Enhanced Swift-XRT position
  56. GRB 170813A: Swift detection of a burst
  57. Konus-Wind observation of GRB 170808B
  58. GRB 170808A: MAXI/GSC detection
  59. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  60. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  61. GRB 170728B: COATLI Observations And Confirmation of Fading
  62. GRB 170728B iTelescope observation
  63. GRB 170728B: NOT optical afterglow confirmation
  64. Fermi GBM trigger 522048561/170718229 is not a GRB
  65. LIGO/Virgo G275697: LOFAR follow-up
  66. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  67. GRB 170705A: TShAO optical observations
  68. GRB 170710A: Gemini-S candidate counterpart
  69. GRB 170710A: Enhanced Swift-XRT position
  70. GRB 170710A: Prompt enhanced Swift-XRT position
  71. GRB 170710A: Swift detection of a burst
  72. GRB 170705A: MITSuME Akeno Optical Observation
  73. GRB 170629A: Fermi GBM observation
  74. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  75. GRB 170607A: Swift/UVOT Detection
  76. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  77. GRB 170531B: Redshift from GTC/OSIRIS
  78. GRB 170524A: Swift detection of a burst (or possible new SGR)
  79. GRB 170522A: Swift-XRT observations
  80. Konus-Wind observation of GRB 170510A
  81. LIGO/Virgo G284239: AstroSat CZTI upper limits
  82. LIGO/Virgo G284239:SVOM/Mini-GWAC observations of the initial skymap
  83. LIGO/Virgo G284239: TZAC TAROT network observations with TRE/TCA/TCH
  84. GRB 170428A: DCT Imaging
  85. Swift Trigger 748858: AbAO and TSHAO optical observations
  86. GRB 170419B: Swift detection of a burst
  87. Swift Trigger 748858: MASTER-OAFA early optical observations
  88. Konus-Wind observation of GRB 170409A
  89. Trigger 745966: Swift detection of 4U1850-03
  90. GRB 170325A: optical observations, possible OT/host detection
  91. Swift triggered on SAX J1806.5-221
  92. LIGO/Virgo G275697: LOFAR follow-up
  93. GRB 170330A: Swift detection of a burst
  94. GRB 170329A: Fermi GBM detection
  95. GRB 170329A: Fermi-LAT detection
  96. INTEGRAL pointed follow-up of IceCube-170321A
  97. Konus-Wind observation of GRB 170320A
  98. GRB 170318B: Swift detection of a burst
  99. LIGO/Virgo G277583: AstroSat CZTI upper limits
  100. GRB 170317A: Swift/UVOT Detection

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