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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"

36147 results found.

  1. GRB 170705A: Swift detection of a burst with an optical counterpart
  2. GRB 170629A: Swift-XRT refined Analysis
  3. GRB 170629A: Swift-BAT refined analysis
  4. GRB 170629A: Enhanced Swift-XRT position
  5. GRB 170629A: Fermi GBM observation
  6. GRB 170629A: Swift detection of a burst
  7. GRB 170626B CALET Gamma-Ray Burst Monitor detection
  8. Konus-Wind observation of GRB 170626B
  9. IPN Triangulation of GRB 170626B
  10. Konus-Wind observation of GRB 170626A
  11. GRB 170626A: SAO RAS confirmation of OT fading
  12. GRB 170626A: TShAO optical observations
  13. GRB 170607A: 15 GHz upper limits from AMI
  14. GRB 170626A: Insight-HXMT observation
  15. GRB 170626A: OASDG optical observations
  16. GRB 170626A: MASTER-Tunka OT detection.
  17. GRB 170626A: Swift-BAT refined analysis
  18. GRB 170626A: TNG optical observations
  19. GRB 170626A: Afterglow detection from 1.5m OSN
  20. GRB 170626A: SAO RAS possible OT detection
  21. GRB 170626A: Swift-XRT refined Analysis
  22. GRB 170626A: Fermi GBM observation
  23. GRB 170626B: The first GRB detected by the Insight-HXMT X-ray Telescope (revised)
  24. GRB 170626A: Swift detection of a burst
  25. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  26. Swift Trigger 758005 is Probably Not an Astrophysical Source
  27. GRB 170607A CALET Gamma-Ray Burst Monitor detection
  28. Konus-Wind observation of GRB 170616A
  29. IPN Triangulation of GRB 170616A (short/hard)
  30. GRB 170614A: AstroSat CZTI detection
  31. GRB 170614A CALET Gamma-Ray Burst Monitor detection
  32. GRB 170606A CALET Gamma-Ray Burst Monitor detection
  33. Konus-Wind observation of GRB 170604A
  34. Konus-Wind observation of GRB 170607B
  35. GRB 170610A: MAXI/GSC detection
  36. IPN Triangulation of GRB 170607B
  37. GRB 170607A: Redshift from GTC/OSIRIS
  38. GRB 170607B: Fermi GBM detection
  39. GRB 170607A: ISON/Terskol optical observations
  40. LIGO/Virgo G288732: Swift/BAT data search
  41. GRB 170607B: AstroSat CZTI detection
  42. GRB 170607A: Swift-BAT refined analysis
  43. GRB 170607A: Correction on the possible host galaxy identification
  44. GRB 170607A: Swift/UVOT Detection
  45. GRB 170607A: MASTER-Tavrida early OT observations
  46. GRB 170607A: Fermi GBM observation
  47. GRB 170607A: NOT optical afterglow detection
  48. GRB 170607A: Swift-XRT refined Analysis
  49. GRB 170607A: Enhanced Swift-XRT position
  50. GRB 170607A: Swift detection of a burst with a bright optical counterpart
  51. GRB 170526A: 15 GHz upper limits from AMI
  52. GRB 170524A: 15 GHz upper limits from AMI
  53. GRB 170519A: 15 GHz upper limits from AMI
  54. GRB 170531B: Zeiss-1000/CrAO optical observations
  55. GRB 170531B: WHT spectroscopy
  56. GRB 170519A: TShAO and AbAO optical observations
  57. GRB 170604A: Swift/UVOT Observations
  58. GRB 170519A: Mondy optical observations
  59. GRB 170529A: AstroSat CZTI detection
  60. GRB 170604A: RATIR Optical and NIR Observations
  61. GRB 170604A: AbAO optical observations
  62. GRB 170522A: confirmation of the X-ray afterglow
  63. GROND observations of GRB170604A
  64. GRB 170604A: Swift-XRT refined Analysis
  65. GRB 170604A: GTC spectroscopic redshift
  66. GRB 170604A: Enhanced Swift-XRT position
  67. GRB 170604A: Swift-BAT refined analysis
  68. Swift Trigger 755873: D50 optical limits
  69. Swift Trigger 755873: a possible GRB
  70. GRB 170604A: optical observations
  71. GRB 170604A: Swift detection of a burst
  72. GRB 170531B: ISON/Terskol optical observations
  73. GRB 170531B: Swift/UVOT Detection
  74. GRB 170531B: SMARTS optical/IR observations
  75. GRB 170531B: Swift-BAT refined analysis
  76. GRB 170531A: Swift/UVOT Upper Limits
  77. GRB 170531B: LCO observations
  78. GRB 170531B: Swift-XRT refined Analysis
  79. GRB 170531A: MASTER Net job
  80. GRB 170531A: Swift-XRT refined Analysis
  81. GRB 170531B: MASTER Net optical counterpart refind position and magnitude
  82. GROND observations of GRB 170531B
  83. GRB 170531B: Redshift from GTC/OSIRIS
  84. GRB 170531A: ePESSTO NTT observations
  85. GRB 170531B: Enhanced Swift-XRT position
  86. GRB 170531B: CrAO confirmation of the afterglow
  87. GRB 170531B: MASTER Net OT detection
  88. GRB 170531A: Swift/UVOT Observations
  89. GRB 170531B: Swift detection of a burst
  90. GRB 170531A: Swift detection of a burst
  91. GRB 170519A: CrAO optical observations
  92. GRB 170524B: Swift-UVOT/XRT Confirmation of Afterglow
  93. Konus-Wind observation of GRB 170529A
  94. Konus-Wind observation of GRB 170527A
  95. IPN Triangulation of GRB 170529A (long)
  96. IPN Triangulation of GRB 170527A
  97. GRB 170511A: AstroSat CZTI detection
  98. GRB 170519A: ISON/Multa optical observations
  99. GRB 170511A: Fermi GBM observation
  100. LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients

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