Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

16315 results found.

  1. LIGO/Virgo G298048: REM optical/NIR observations of candidate in NGC 4993
  2. LIGO/Virgo G298048: DLT40 optical candidate
  3. LIGO/Virgo G298048: DECam optical candidate
  4. LIGO/Virgo G298048: Potential optical counterpart discovered by Swope telescope
  5. LIGO/Virgo G297595: MASTER MASTER Bright PSN detection in error-box
  6. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  7. LIGO/Virgo G297595: REM optical/NIR observations
  8. GRB 170813A: Swift/UVOT Upper Limits
  9. GRB 170813A: RATIR Optical and NIR Observations
  10. GRB 170810A: AbAO optical upper limit
  11. LIGO/Virgo G296853: BOOTES-1 and GTC optical observations
  12. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  13. GRB 170714A: ATCA detection of the radio counterpart
  14. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  15. GRB 170804A: LCO Observations
  16. GRB 170804A: Swift detection of a burst with optical counterpart
  17. GRB 170803A: Swift detection of a burst with an optical counterpart
  18. GRB 170728B: time correction to MASTER GCN Circular 21391
  19. GRB 170728B: Swift/UVOT Further Analysis
  20. GRB 170714A: Chandra observations
  21. GRB 170728B: VLA radio afterglow detection
  22. GRB 170728B: Optical observations at Crni Vrh
  23. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  24. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  25. GRB 170728B: COATLI Observations And Confirmation of Fading
  26. GRB 170728B: Swift/UVOT Upper Limits
  27. GRB 170728B iTelescope observation
  28. GRB 170728A: LCO observations
  29. GRB170714A: XMM observation of the afterglow
  30. GRB 170728B: LT afterglow confirmation
  31. GRB 170728B: NOT optical afterglow confirmation
  32. GRB 170728B: position of the TNG optical counterpart
  33. GRB 170728B: TNG optical afterglow candidate
  34. GRB170714A: ATCA observation
  35. GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC
  36. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  37. GRB 170711A: ISON/Terskol and AbAO optical observations
  38. GRB 170711A: Swift/UVOT Upper Limits
  39. GRB 170711A: RATIR Optical and NIR Observations
  40. GRB 170705A: TShAO optical observations
  41. GRB170710A: Swift/UVOT detection
  42. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  43. GRB 170705A: KAIT Optical Observations
  44. GRB 170705A: ISON/Terskol optical observations
  45. GRB 170705A: MITSuME Akeno Optical Observation
  46. GRB 170705A: RATIR Optical and NIR Observations
  47. GRB 170705A: MASTER-OAFA early OT observations
  48. GRB 170705A: Swift detection of a burst with an optical counterpart
  49. GRB 170626A: TShAO optical observations
  50. GRB 170626A: OASDG optical observations
  51. GRB 170626A: TNG optical observations
  52. LIGO/Virgo G288732: Pan-STARRS coverage of the Fermi/LAT candidate position
  53. GRB170612.87 MASTER-Net OT detection
  54. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  55. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  56. GRB 170607A: ISON/Terskol optical observations
  57. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  58. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  59. GRB 170607A: Swift/UVOT Detection
  60. GRB 170607A: NOT optical afterglow detection
  61. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  62. GRB 170531B: Zeiss-1000/CrAO optical observations
  63. GRB 170519A: TShAO and AbAO optical observations
  64. GRB 170604A: Swift/UVOT Observations
  65. GRB 170519A: Mondy optical observations
  66. GRB 170604A: RATIR Optical and NIR Observations
  67. GRB 170604A: AbAO optical observations
  68. Swift Trigger 755873: MASTER Net optical observations
  69. Swift Trigger 755873: D50 optical limits
  70. GRB 170604A: optical observations
  71. GRB 170531B: ISON/Terskol optical observations
  72. GRB 170531B: SMARTS optical/IR observations
  73. GRB 170531A: Swift/UVOT Upper Limits
  74. GRB 170531B: LCO observations
  75. GRB 170531A: MASTER Net job
  76. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  77. GRB 170531A: ePESSTO NTT observations
  78. GRB 170531B: MASTER Net OT detection
  79. GRB 170519A: CrAO optical observations
  80. GRB 170519A: ISON/Multa optical observations
  81. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  82. GRB 170526A: Swift/UVOT Upper Limits
  83. GRB 170524A: RATIR Optical and NIR Observations
  84. GRB 170524B: MASTER-OAFA observations
  85. GRB 170524A: TSHAO and CrAO optical observations
  86. GRB 170524A: Swift/UVOT Upper Limits
  87. GRB 170524A: D50 optical observation and limit
  88. GRB 170522A: Global MASTER-Net job
  89. GRB 170519A: MITSuME Akeno Optical Observation
  90. GRB 170519A: Watcher optical observations
  91. GRB 170519A: Continued RATIR Optical and NIR Observations
  92. GRB 170519A: MITSuME Okayama Optical Observation
  93. GRB 170519A: NOT optical observations
  94. GRB 170519A: BOOTES-5/JGT early optical detection
  95. GRB 170519A: KAIT Optical Observations
  96. GRB 170519A: iTelescope T11 optical observations
  97. GRB 170519A: Weihai optical observations
  98. GRB 170510A: LCO Siding Springs early observations
  99. GRB 170519A: RATIR Optical and NIR Observations
  100. GRB 170519A: optical 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