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"

16310 results found.

  1. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  2. LIGO/Virgo G297595: REM optical/NIR observations
  3. GRB 170813A: Swift/UVOT Upper Limits
  4. GRB 170813A: RATIR Optical and NIR Observations
  5. GRB 170810A: AbAO optical upper limit
  6. LIGO/Virgo G296853: BOOTES-1 and GTC optical observations
  7. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  8. GRB 170714A: ATCA detection of the radio counterpart
  9. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  10. GRB 170804A: LCO Observations
  11. GRB 170804A: Swift detection of a burst with optical counterpart
  12. GRB 170803A: Swift detection of a burst with an optical counterpart
  13. GRB 170728B: time correction to MASTER GCN Circular 21391
  14. GRB 170728B: Swift/UVOT Further Analysis
  15. GRB 170714A: Chandra observations
  16. GRB 170728B: VLA radio afterglow detection
  17. GRB 170728B: Optical observations at Crni Vrh
  18. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  19. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  20. GRB 170728B: COATLI Observations And Confirmation of Fading
  21. GRB 170728B: Swift/UVOT Upper Limits
  22. GRB 170728B iTelescope observation
  23. GRB 170728A: LCO observations
  24. GRB170714A: XMM observation of the afterglow
  25. GRB 170728B: LT afterglow confirmation
  26. GRB 170728B: NOT optical afterglow confirmation
  27. GRB 170728B: position of the TNG optical counterpart
  28. GRB 170728B: TNG optical afterglow candidate
  29. GRB170714A: ATCA observation
  30. GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC
  31. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  32. GRB 170711A: ISON/Terskol and AbAO optical observations
  33. GRB 170711A: Swift/UVOT Upper Limits
  34. GRB 170711A: RATIR Optical and NIR Observations
  35. GRB 170705A: TShAO optical observations
  36. GRB170710A: Swift/UVOT detection
  37. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  38. GRB 170705A: KAIT Optical Observations
  39. GRB 170705A: ISON/Terskol optical observations
  40. GRB 170705A: MITSuME Akeno Optical Observation
  41. GRB 170705A: RATIR Optical and NIR Observations
  42. GRB 170705A: MASTER-OAFA early OT observations
  43. GRB 170705A: Swift detection of a burst with an optical counterpart
  44. GRB 170626A: TShAO optical observations
  45. GRB 170626A: OASDG optical observations
  46. GRB 170626A: TNG optical observations
  47. LIGO/Virgo G288732: Pan-STARRS coverage of the Fermi/LAT candidate position
  48. GRB170612.87 MASTER-Net OT detection
  49. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  50. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  51. GRB 170607A: ISON/Terskol optical observations
  52. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  53. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  54. GRB 170607A: Swift/UVOT Detection
  55. GRB 170607A: NOT optical afterglow detection
  56. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  57. GRB 170531B: Zeiss-1000/CrAO optical observations
  58. GRB 170519A: TShAO and AbAO optical observations
  59. GRB 170604A: Swift/UVOT Observations
  60. GRB 170519A: Mondy optical observations
  61. GRB 170604A: RATIR Optical and NIR Observations
  62. GRB 170604A: AbAO optical observations
  63. Swift Trigger 755873: MASTER Net optical observations
  64. Swift Trigger 755873: D50 optical limits
  65. GRB 170604A: optical observations
  66. GRB 170531B: ISON/Terskol optical observations
  67. GRB 170531B: SMARTS optical/IR observations
  68. GRB 170531A: Swift/UVOT Upper Limits
  69. GRB 170531B: LCO observations
  70. GRB 170531A: MASTER Net job
  71. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  72. GRB 170531A: ePESSTO NTT observations
  73. GRB 170531B: MASTER Net OT detection
  74. GRB 170519A: CrAO optical observations
  75. GRB 170519A: ISON/Multa optical observations
  76. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  77. GRB 170526A: Swift/UVOT Upper Limits
  78. GRB 170524A: RATIR Optical and NIR Observations
  79. GRB 170524B: MASTER-OAFA observations
  80. GRB 170524A: TSHAO and CrAO optical observations
  81. GRB 170524A: Swift/UVOT Upper Limits
  82. GRB 170524A: D50 optical observation and limit
  83. GRB 170522A: Global MASTER-Net job
  84. GRB 170519A: MITSuME Akeno Optical Observation
  85. GRB 170519A: Watcher optical observations
  86. GRB 170519A: Continued RATIR Optical and NIR Observations
  87. GRB 170519A: MITSuME Okayama Optical Observation
  88. GRB 170519A: NOT optical observations
  89. GRB 170519A: BOOTES-5/JGT early optical detection
  90. GRB 170519A: KAIT Optical Observations
  91. GRB 170519A: iTelescope T11 optical observations
  92. GRB 170519A: Weihai optical observations
  93. GRB 170510A: LCO Siding Springs early observations
  94. GRB 170519A: RATIR Optical and NIR Observations
  95. GRB 170519A: optical observations
  96. GRB 170519A: Swift detection of a burst with an optical counterpart
  97. GRB 170510A: Swift-XRT afterglow detection
  98. GRB 170516A: Swift/UVOT Upper Limits
  99. Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
  100. GRB 170510A: Global MASTER Net possible OT 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