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"

21006 results found.

  1. GRB 170519A: Watcher optical observations
  2. GRB 170519A: Continued RATIR Optical and NIR Observations
  3. GRB 170519A: NOT optical observations
  4. GRB170519A, Swift-UVOT Detection
  5. GRB 170519A: KAIT Optical Observations
  6. GRB 170519A: iTelescope T11 optical observations
  7. GRB 170519A: Weihai optical observations
  8. GRB 170510A: LCO Siding Springs early observations
  9. GRB 170519A: RATIR Optical and NIR Observations
  10. GRB 170519A: optical observations
  11. GRB 170510A: Swift-XRT afterglow detection
  12. GRB 170516A: Swift/UVOT Upper Limits
  13. Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
  14. Swift Trigger on AXP CXOU J164710.2-455216
  15. GRB 170510A: Global MASTER Net possible OT observations
  16. LIGO/Virgo G275404 and G275659: SkyMapper Follow-up Observations
  17. LIGO/Virgo G284239: Konus-Wind observations
  18. GRB 170510A: LCO possible counterpart
  19. GRB 170510A: Swift-XRT observations
  20. LIGO/Virgo G284239: H.E.S.S. very-high energy gamma-ray follow-up
  21. LIGO/Virgo G284239: MAXI/GSC observations
  22. GRB 170510A: Tiled Swift observations
  23. GRB 170423A: TAROT Reunion observatory optical observations
  24. Swift XRT observations of GRB 170424A
  25. LIGO/Virgo G284239:SVOM/Mini-GWAC observations of the initial skymap
  26. LIGO/Virgo G284239: HAWC follow-up
  27. LIGO/Virgo G284239: MASTER automatic follow up and synchronous observations
  28. LIGO/Virgo G284239: TZAC TAROT network observations with TRE/TCA/TCH
  29. LIGO/Virgo G284239: AGILE GRID observations
  30. LIGO/Virgo G284239: INTEGRAL search for a prompt gamma-ray counterpart
  31. LIGO/Virgo G284239: AGILE MCAL Observations
  32. LIGO/Virgo G284239: IceCube neutrino observations
  33. GRB 170428A: GTC spectroscopic redshift of candidate host galaxy
  34. GRB 170428A: 15 GHz upper limits from AMI
  35. Swift Trigger 748858: 15 GHz upper limits from AMI
  36. GRB 170428A: TNG optical observations
  37. Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
  38. GRB 170428A: DCT Imaging
  39. GRB 170428A: TAROT La Silla observatory optical observations
  40. GRB 170428A: RATIR Afterglow Confirmation
  41. GRB 170428A: GROND detection of the afterglow
  42. GRB 170428A: Swift/UVOT Upper Limits
  43. GRB 170428A: MASTER-OAFA early optical observations
  44. GRB 170424A: LCO Observations
  45. GRB 170419A: Swift/UVOT Upper Limits
  46. GRB 170424A: Tiled Swift observations
  47. GRB 170419A: LCO Observations
  48. Swift Trigger 748858: AbAO and TSHAO optical observations
  49. Swift Trigger 748858: TAROT La Silla observatory optical observations
  50. Swift Trigger 748858: RATIR Optical and NIR Observations
  51. GRB 170419B: Zadko observatory - Gingin optical observations
  52. GRB 170419A: Zadko observatory - Gingin optical observations
  53. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  54. Swift Trigger 748858: MASTER-OAFA early optical observations
  55. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  56. LIGO/Virgo G275404: DLT40 follow-up observation
  57. GRB 170409A: TAROT Reunion observatory optical observations
  58. GRB 170405A: SMARTS optical/IR afterglow observations
  59. GRB 170317A: SAO RAS optical observations
  60. GRB170405A, Swift-UVOT Detection
  61. GRB 170405A: Etelman observatory optical observations
  62. GRB 170405A: RATIR Optical and NIR Observations
  63. GRB 170405A: LCO FTN observations
  64. GRB 170405A: ISON/Terskol optical observations
  65. GRB 170405A: Watcher optical detection
  66. GRB 170405A: TAROT Reunion observatory optical observations
  67. GRB 170405A: NOT optical observations
  68. LIGO/Virgo G275404: European VLBI Network (EVN) follow-up of the near-IR transient in the AGL J1914+1043 field
  69. GRB 170325A: optical observations, possible OT/host detection
  70. Fermi-LAT Gamma-ray Observations of IceCube-170321
  71. Swift triggered on SAX J1806.5-221
  72. GRB 170331A: Swift/UVOT Upper Limits
  73. IceCube-170321A: Swift-XRT observations
  74. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  75. GRB 170325A: 15 GHz upper limits from AMI
  76. GRB 170318B: 15 GHz upper limits from AMI
  77. GRB 170318A: 15 GHz upper limits from AMI
  78. GRB 170317A: 15 GHz upper limits from AMI
  79. GRB 170330A: LCO Cerro Tololo observations
  80. LIGO/Virgo G275697: LOFAR follow-up
  81. GRB 170331A: LCO Sutherland observations
  82. Fermi trigger 512347439/GRB 170327A: MASTER-SAAO possible OT detection
  83. LIGO/Virgo G277583: Konus-Wind observations
  84. INTEGRAL pointed follow-up of IceCube-170321A
  85. LIGO/Virgo G277583: Fermi GBM Observations
  86. LIGO/Virgo G277583: INTEGRAL search for an X-ray and gamma-ray counterpart
  87. LIGO/Virgo G275697: AMI Large Array Search for a Radio Afterglow
  88. GRB 170318A: KAIT Optical Upper Limit
  89. GRB 170317A: Mondy optical observations
  90. GRB 170318B: RATIR Optical and NIR Observations
  91. GRB 170317A: RATIR Optical and NIR Observations
  92. GRB 170318B: Swift/UVOT Upper Limits
  93. LIGO/Virgo G277583: CALET Observations
  94. GRB 170318A: RATIR Optical and NIR Observations
  95. GRB 170318A: Swift/UVOT Upper Limits
  96. GRB 170317A: RATIR Optical and NIR Observations
  97. IceCube-170312A: MASTER follow-up observations
  98. LIGO/Virgo G277583: Asiago spectroscopic classification of ATLAS17byo and ATLAS17cgg
  99. GRB 170317A: LCO FTN observations
  100. LIGO/Virgo G277583 : MAXI/GSC observations

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