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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"

27250 results found.

  1. GRB 170705A: Swift/UVOT Detection
  2. GRB 170705A: RATIR Optical and NIR Observations
  3. GRB 170705A: Swift-XRT refined Analysis
  4. GRB 170705A: MASTER-OAFA early OT observations
  5. GRB 170705A: Swift detection of a burst with an optical counterpart
  6. GRB 170629A: Swift-XRT refined Analysis
  7. GRB 170629A: Swift-BAT refined analysis
  8. GRB 170629A: Fermi GBM observation
  9. GRB 170629A: Swift detection of a burst
  10. GRB 170626B CALET Gamma-Ray Burst Monitor detection
  11. Konus-Wind observation of GRB 170626A
  12. GRB 170626A: Insight-HXMT observation
  13. GRB 170626A: OASDG optical observations
  14. GRB 170626A: MASTER-Tunka OT detection.
  15. GRB 170626A: Swift-BAT refined analysis
  16. GRB 170626A: Swift-XRT refined Analysis
  17. GRB 170626A: Fermi GBM observation
  18. GRB 170626B: The first GRB detected by the Insight-HXMT X-ray Telescope (revised)
  19. GRB 170626A: Swift detection of a burst
  20. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  21. Swift trigger 758168 is probably not an astrophysical source
  22. Swift Trigger 758005 is Probably Not an Astrophysical Source
  23. GRB 170607A CALET Gamma-Ray Burst Monitor detection
  24. GRB 170614A: AstroSat CZTI detection
  25. GRB 170614A CALET Gamma-Ray Burst Monitor detection
  26. GRB 170606A CALET Gamma-Ray Burst Monitor detection
  27. LIGO/Virgo G288732: VLA imaging of the possible Fermi/LAT counterpart
  28. Swift Trigger 756953: false identification by MASTER GCN 21250
  29. Swift Trigger 756953 is probably not an astrophysical source
  30. GRB170612.87 MASTER-Net OT detection
  31. LIGO/Virgo G288732: HAWC follow-up
  32. Konus-Wind observation of GRB 170604A
  33. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  34. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  35. LIGO/Virgo G288732 : MAXI/GSC observations
  36. GRB 170607B: Fermi GBM detection
  37. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  38. LIGO/Virgo G288732: Swift/BAT data search
  39. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  40. GRB 170607B: AstroSat CZTI detection
  41. LIGO/Virgo G288732: INTEGRAL search for a prompt gamma-ray counterpart
  42. GRB 170607A: Swift-BAT refined analysis
  43. LIGO/Virgo G288732:SVOM/Mini-GWAC observations of the initial skymap
  44. LIGO/Virgo G288732: AGILE GRID Observations
  45. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  46. LIGO/Virgo G288732: IceCube neutrino observations update
  47. LIGO/VIRGO G288732: Fermi GBM Observations
  48. LIGO/Virgo G288732: Identification of a GW Binary Merger Candidate
  49. GRB 170607A: Swift/UVOT Detection
  50. GRB 170607A: MASTER-Tavrida early OT observations
  51. GRB 170607A: Fermi GBM observation
  52. GRB 170607A: Swift-XRT refined Analysis
  53. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  54. GRB 170604A: Swift/UVOT Observations
  55. GRB 170519A: Mondy optical observations
  56. GRB 170529A: AstroSat CZTI detection
  57. GRB 170604A: RATIR Optical and NIR Observations
  58. Swift trigger 755873: Swift BAT and XRT refined analysis
  59. GRB 170522A: confirmation of the X-ray afterglow
  60. GROND observations of GRB170604A
  61. Swift Trigger 755873: MASTER Net optical observations
  62. GRB 170604A: Swift-XRT refined Analysis
  63. GRB 170604A: Swift-BAT refined analysis
  64. Swift Trigger 755873: D50 optical limits
  65. Swift Trigger 755873: a possible GRB
  66. GRB 170604A: optical observations
  67. GRB 170604A: Swift detection of a burst
  68. Trigger 755848: Swift spurious trigger on Cen X-3
  69. GRB 170531B: Swift/UVOT Detection
  70. GRB 170531B: Swift-BAT refined analysis
  71. GRB 170531A: Swift/UVOT Upper Limits
  72. GRB 170531B: Swift-XRT refined Analysis
  73. GRB 170531A: MASTER Net job
  74. GRB 170531A: Swift-XRT refined Analysis
  75. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  76. GROND observations of GRB 170531B
  77. GRB 170531B: MASTER Net OT detection
  78. GRB 170531A: Swift/UVOT Observations
  79. GRB 170531B: Swift detection of a burst
  80. GRB 170531A: Swift detection of a burst
  81. GRB 170524B: Swift-UVOT/XRT Confirmation of Afterglow
  82. GRB 170511A: AstroSat CZTI detection
  83. GRB 170511A: Fermi GBM observation
  84. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
  85. LIGO/Virgo G268556: BSA radio observations at 110 MHz
  86. GRB 170527A: Fermi GBM detection
  87. GRB 170526A, Swift-BAT refined analysis
  88. GRB 170526A: Swift/UVOT Upper Limits
  89. GRB 170526A: Swift-XRT refined Analysis
  90. GRB 170524A: RATIR Optical and NIR Observations
  91. GRB 170526A: Swift detection of a burst
  92. GRB 170524B: MASTER-OAFA observations
  93. GRB 170511A CALET Gamma-Ray Burst Monitor detection
  94. GRB 170524A: TSHAO and CrAO optical observations
  95. GRB 170524A: Swift-BAT refined analysis
  96. GRB 170524B: Swift detection of a burst
  97. GRB 170524A: Swift/UVOT Upper Limits
  98. GRB 170524A: D50 optical observation and limit
  99. GRB 170524A: Swift-XRT refined Analysis
  100. IPN Triangulation of GRB 170522A

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