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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.

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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19599 results found.

  1. GRB 170921A: 15 GHz upper limits from AMI
  2. GRB 170903A: 15 GHz upper limits from AMI
  3. GRB 170906C: 15 GHz upper limits from AMI
  4. GRB 170823A: 15 GHz upper limits from AMI
  5. GRB 170822A: 15 GHz upper limits from AMI
  6. GRB 171001A: Swift detection of a burst
  7. LIGO/VIRGO G299232: AMI-LA Observations of the optical transient Swift J014008.5+343403.6
  8. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  9. Further Swift-XRT observations of IceCube 170922A
  10. LIGO/Virgo G299232/GW170825: serendipitous XMM-Newton slew observations
  11. LIGO/Virgo G298936/GW170823: serendipitous XMM-Newton slew observations
  12. IceCube-170922A: Swift-XRT observations
  13. Correction to GCN Circular 21919: GRB 170921C: Insight-HXMT detection
  14. GRB 170906A: Insight-HXMT detection
  15. IPN Triangulation of GRB 170921B
  16. GRB 170921A: RATIR Optical Afterglow Detection and NIR Observations
  17. GRB 170921A: Swift/UVOT Upper Limits
  18. GRB 170921A: Swift-BAT refined analysis
  19. GRB 170921A: LCO 2m telescope observations
  20. GRB 170921A: Enhanced Swift-XRT position
  21. GRB 170921A: Swift-XRT refined Analysis
  22. GRB 170921A: TAROT Calern observatory optical observations
  23. GRB 170921A: Swift detection of a burst
  24. LIGO/Virgo G298048: ATCA monitoring of SSS17a in NGC 4993
  25. Swift trigger 773082 is probably not astrophysical
  26. LIGO/Virgo G298048: ATCA monitoring of SSS17a in NGC 4993
  27. GRB 170912B: Swift/UVOT Upper Limits
  28. GRB 170912B: Swift-BAT refined analysis
  29. GRB 170912A: Swift-BAT refined analysis
  30. GRB 170912A: Swift-XRT refined Analysis
  31. GRB 170912A: Swift/UVOT Upper-Limits
  32. GRB 170912B: Swift-XRT refined Analysis
  33. GRB 170912B: Fermi GBM observations
  34. GRB 170912B: Enhanced Swift-XRT position
  35. GRB 170912B: Swift detection of a burst
  36. GRB 170912A: Enhanced Swift-XRT position
  37. GRB 170912A: Prompt enhanced Swift-XRT position
  38. GRB 170912A: Swift detection of a burst
  39. Konus-Wind observation of GRB 170906A
  40. Konus-Wind observation of GRB 170906C
  41. GRB 170906A: AstroSat CZTI(Veto) detection
  42. Swift Triggered on MAXI J1535-571
  43. GRB 170906A: Swift/UVOT Detection
  44. GRB 170906B: Swift/UVOT Upper Limits
  45. GRB 170906B: Swift-XRT refined Analysis
  46. LIGO/Virgo G299232: Swift-XRT sources
  47. GRB 170906B: Swift-BAT refined analysis
  48. GRB 170906B: Fermi GBM detection
  49. GRB 170906A: Fermi GBM detection
  50. GRB 170906A: Swift-BAT refined analysis
  51. GRB 170906A: Swift-XRT refined Analysis
  52. GRB 170906C: Swift/UVOT Upper Limits
  53. GRB 170906C: Swift-XRT refined Analysis
  54. GRB 170906C: Swift-BAT refined analysis
  55. GRB 170906C: Enhanced Swift-XRT position
  56. GRB 170906A: MASTER-OAFA (Argentina) early automatic OT detection
  57. GRB 170906C: Swift-XRT observations
  58. GRB 170906A: Fermi-LAT detection
  59. GRB 170906C: Swift detection of a burst
  60. GRB 170906A: Enhanced Swift-XRT position
  61. GRB 170906B: Enhanced Swift-XRT position
  62. GRB 170906B: Swift detection of a burst
  63. GRB 170906A: Swift detection of a burst with an optical afterglow
  64. IPN Triangulation of GRB 170904A (long/very bright)
  65. LIGO/Virgo G299232: Lulin Observations of Possible OTs
  66. GRB 170904A: Insight-HXMT detection
  67. GRB 170903A: Fermi GBM observation
  68. LIGO/Virgo G299232: Maidanak observations of optical transient SwiftJ014008.5+343403.6
  69. LIGO/Virgo G299232: LOFAR follow-up
  70. Swift Trigger on continued activity of MAXI J1535-571
  71. GRB 170827A: LCO Observations
  72. GRB 170903A: Swift/UVOT Upper Limits
  73. GRB 170903A: UAFO /ISON optical upper limit
  74. LIGO/Virgo G298048: ATCA monitoring of SSS17a in NGC 4993
  75. GRB 170903A: Swift-XRT refined Analysis
  76. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  77. GRB 170903A: Enhanced Swift-XRT position
  78. GRB 170903A: Swift-BAT refined analysis
  79. GRB 170903A: Swift-XRT observations
  80. GRB 170903A: Swift detection of a burst
  81. Swift Triggers on MAXI J1535-571
  82. Swift Trigger 770431 (GRB 170902A) is a not a GRB
  83. GRB 170902A: Enhanced Swift-XRT position
  84. GRB 170902A: Swift detection of a burst or possible Galactic transient
  85. LIGO/Virgo G298048: Chandra monitoring of the X-ray emission from SSS17a
  86. LIGO/Virgo G298048: Continued X-ray monitoring and X-ray detection of GW170817 [erratum]]
  87. LIGO/Virgo G298048: Continued Gemini South observations
  88. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  89. LIGO/Virgo G299232: SVOM/2.16-m Optical Telescope Observations of Swift UVOT Transient
  90. LIGO/Virgo G299232: HAWC follow-up
  91. LIGO/Virgo G299232: Further Swift/UVOT Observations of Optical Transient SwiftJ014008.5+343403.6
  92. LIGO/Virgo G299232 : RATIR Optical and NIR Observations of Swift UVOT source
  93. LIGO/Virgo G299232: Liverpool Telescope observations
  94. LIGO/Virgo G299232: observations of the optical Transient Discovered by Swift/UVOT
  95. IPN Triangulation of GRB 170826B
  96. LIGO/Virgo G299232/PGWB170825.55: early MASTER observations of the Swift UVOT source position
  97. LIGO/Virgo G299232: GRAWITA Asiago/Copernico Telescope observations
  98. GRB170827A: Further GROND follow-up observations
  99. IPN Triangulation of GRB 170827B (short)
  100. LIGO/Virgo G299232: Optical Transient Discovery by Swift/UVOT

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