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"

21009 results found.

  1. GRB 170728B: COATLI Observations And Confirmation of Fading
  2. GRB 170728B: Swift/UVOT Upper Limits
  3. GRB 170728A: Swift/UVOT Detection
  4. GRB 170728A: LCO observations
  5. GRB 170728B: NOT optical afterglow confirmation
  6. GRB 170728B: TNG optical afterglow candidate
  7. GRB170714A: ATCA observation
  8. GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC
  9. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  10. LIGO/Virgo G275697: LOFAR follow-up
  11. GRB 170710B: Further Swift-XRT observations
  12. Correction to GCN Circular 21351: GRB 170714A: Swift/UVOT Observations
  13. GRB170714A: VLA Observations of the Bastille Day Ultra-long Burst
  14. GRB 170714A: Swift/UVOT Observations
  15. GRB 170714A: TNG NIR observations
  16. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  17. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  18. GRB 170711A: ISON/Terskol and AbAO optical observations
  19. GRB 170711A: Swift/UVOT Upper Limits
  20. GRB 170711A: RATIR Optical and NIR Observations
  21. GRB 170705A: TShAO optical observations
  22. GRB 170710B: Swift-XRT and UVOT observations
  23. GRB 170710B: Swift ToO observations
  24. GRB170710A: Swift/UVOT detection
  25. Trigger 760835: Swift misidentification of GRS1716-249
  26. LIGO/Virgo G288732: Konus-Wind observations
  27. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  28. GRB 170705A: KAIT Optical Observations
  29. GRB 170705A: ISON/Terskol optical observations
  30. GRB 170705A: Swift/UVOT Detection
  31. GRB 170705A: RATIR Optical and NIR Observations
  32. GRB 170705A: MASTER-OAFA early OT observations
  33. GRB 170626A: TShAO optical observations
  34. GRB 170607A: 15 GHz upper limits from AMI
  35. GRB 170626A: OASDG optical observations
  36. GRB 170626A: TNG optical observations
  37. GRB 170626A: SAO RAS possible OT detection
  38. LIGO/Virgo G288732: VLA imaging of the possible Fermi/LAT counterpart
  39. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  40. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  41. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  42. LIGO/Virgo G288732 : MAXI/GSC observations
  43. GRB 170607A: ISON/Terskol optical observations
  44. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  45. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  46. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  47. LIGO/Virgo G288732: INTEGRAL search for a prompt gamma-ray counterpart
  48. LIGO/Virgo G288732:SVOM/Mini-GWAC observations of the initial skymap
  49. LIGO/Virgo G288732: AGILE GRID Observations
  50. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  51. LIGO/Virgo G288732: IceCube neutrino observations update
  52. LIGO/Virgo G288732: AGILE MCAL Observations
  53. LIGO/VIRGO G288732: Fermi GBM Observations
  54. GRB 170607A: Swift/UVOT Detection
  55. GRB 170607A: MASTER-Tavrida early OT observations
  56. GRB 170607A: NOT optical afterglow detection
  57. GRB 170526A: 15 GHz upper limits from AMI
  58. GRB 170524A: 15 GHz upper limits from AMI
  59. GRB 170519A: 15 GHz upper limits from AMI
  60. GRB 170531B: Zeiss-1000/CrAO optical observations
  61. GRB 170519A: TShAO and AbAO optical observations
  62. GRB 170604A: Swift/UVOT Observations
  63. GRB 170519A: Mondy optical observations
  64. GRB 170604A: RATIR Optical and NIR Observations
  65. GRB 170604A: AbAO optical observations
  66. GRB 170522A: confirmation of the X-ray afterglow
  67. GROND observations of GRB170604A
  68. Swift Trigger 755873: MASTER Net optical observations
  69. GRB 170604A: GTC spectroscopic redshift
  70. Swift Trigger 755873: D50 optical limits
  71. GRB 170604A: optical observations
  72. Trigger 755848: Swift spurious trigger on Cen X-3
  73. GRB 170531B: ISON/Terskol optical observations
  74. GRB 170531B: Swift/UVOT Detection
  75. GRB 170531B: SMARTS optical/IR observations
  76. GRB 170531A: Swift/UVOT Upper Limits
  77. GRB 170531B: LCO observations
  78. GRB 170531A: MASTER Net job
  79. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  80. GROND observations of GRB 170531B
  81. GRB 170531B: Redshift from GTC/OSIRIS
  82. GRB 170531A: ePESSTO NTT observations
  83. GRB 170531B: MASTER Net OT detection
  84. GRB 170531A: Swift/UVOT Observations
  85. GRB 170519A: CrAO optical observations
  86. GRB 170524B: Swift-UVOT/XRT Confirmation of Afterglow
  87. GRB 170519A: ISON/Multa optical observations
  88. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  89. LIGO/Virgo G268556: BSA radio observations at 110 MHz
  90. LIGO/Virgo G268556/GW170104: Konus-Wind observations
  91. GRB 170526A: Swift/UVOT Upper Limits
  92. LIGO/Virgo G268556: VERITAS Very-High-Energy Gamma-Ray Observations
  93. GRB 170524A: RATIR Optical and NIR Observations
  94. GRB 170524B: Swift-XRT observations
  95. GRB 170524B: MASTER-OAFA observations
  96. GRB 170524A: TSHAO and CrAO optical observations
  97. GRB 170524B: Swift ToO observations
  98. GRB 170524A: Swift/UVOT Upper Limits
  99. GRB 170524A: D50 optical observation and limit
  100. GRB 170522A: LCO McDonald 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