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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

646 results found.

  1. GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
  2. GRB 200416A: Swift-BAT refined analysis
  3. Fermi trigger No 607537834: Global MASTER-Net observations report
  4. Fermi trigger No 606799116: Global MASTER-Net observations report
  5. Konus-Wind observation of GRB 200313A
  6. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  7. GRB 200227A: Swift-BAT refined analysis
  8. Konus-Wind observation of GRB 200219C
  9. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  10. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  11. Swift GRB200216.56: Global MASTER-Net observations report
  12. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  13. GRB 200131A: Swift-XRT refined Analysis
  14. Fermi trigger No 600666048: Global MASTER-Net observations report
  15. LIGO/Virgo S200105ae: Global MASTER-Net observations report
  16. GRB 191227A: Swift-BAT refined analysis
  17. Swift Trigger 946234: further Swift analysis
  18. GRB 191221B: Swift detection of a burst and a very bright optical candidate
  19. LIGO/Virgo S191220af: Global MASTER-Net observations report
  20. Konus-Wind observation of GRB 191218A
  21. LIGO/Virgo S191216ap: Global MASTER-Net observations report
  22. LIGO/Virgo S191212q: Global MASTER-Net observations report
  23. Fermi trigger No 596808579: Global MASTER-Net observations report
  24. GRB 191106A: Swift-BAT refined analysis
  25. GRB 191031D: Swift-BAT refined analysis
  26. GRB 191031C: Swift-BAT refined analysis
  27. GRB 191031A: Swift-BAT refined analysis
  28. TESS Detection of the Optical Emission from the Possible Untriggered GRB Associated with ZTF19abvizsw
  29. Konus-Wind observation of GRB 191004B
  30. GRB 191004A: Swift-BAT refined analysis
  31. LIGO/Virgo S190930t: J-GEM follow-up observation for Swift J221951-484240
  32. LIGO/Virgo S190930s: No counterpart candidates in KAIT observations
  33. Update to the Fermi GBM Localizations
  34. LIGO/Virgo S190910h: Identification of a GW compact binary merger candidate
  35. LIGO/Virgo S190901ap: No counterpart candidates in KAIT observations
  36. LIGO/Virgo S190901ap : GRAWITA photometric observation of candidate ZTFabvizsw and GCN 25618 revision
  37. LIGO/Virgo S190901ap: Upper limits from CALET observations.
  38. LIGO/Virgo S190901ap: Upper limits from Insight-HXMT/HE observations
  39. LIGO/Virgo S190901ap: Upper limits from Fermi-GBM Observations
  40. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  41. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  42. Integral GRB190828.78 Global MASTER-Net observations report
  43. LIGO/Virgo S190814bv: No candidates found in J-GEM follow-up observations
  44. LIGO/Virgo S190728q: Coverage and upper limits from MAXI/GSC observations
  45. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  46. Fermi trigger No 585007213 Global MASTER-Net observations report
  47. Fermi trigger No 584264100 Global MASTER-Net observations report
  48. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  49. Swift GRB190631. Global MASTER-Net observations report
  50. LIGO/Virgo S190521r: CNEOST follow-up observations
  51. Fermi GRB190520.6 Global MASTER-Net observations report
  52. LIGO/Virgo S190517h: CALET Observations
  53. LIGO/Virgo S190517h: INTEGRAL prompt observation
  54. LIGO/Virgo S190517h: INTEGRAL/SPI-ACS prompt observation
  55. LIGO/Virgo S190510g: J-GEM optical/NIR follow-up observations
  56. LIGO/Virgo S190412m: Further J-GEM optical/NIR observations
  57. GRB 190427A, Swift-BAT refined analysis
  58. LIGO/Virgo S190426c: CNEOST Optical Observations
  59. LIGO/Virgo S190425z: CNEOST Optical Observations
  60. LIGO/Virgo S190426c: SAO optical observation
  61. Fermi GRB190415.17 Global MASTER-Net observations report
  62. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  63. Swift detection of LS I +61 303
  64. Trigger 888312: Swift detection of 4U 1901+03
  65. GRB 190203A: MASTER OT detection
  66. Konus-Wind observation of GRB 190114C
  67. SWIFT GRB190106.57 Global MASTER-Net OT detection
  68. GRB 181027A: Fermi GBM detection
  69. GRB 181020A: Swift-XRT refined Analysis
  70. GRB 181010A: REM optical and NIR afterglow detection
  71. Konus-Wind observation of GRB 180828A
  72. GRB 180728B: MASTER optical observations short GRB IPN error box
  73. GRB 180728B: Fermi GBM detection
  74. GRB 180728A: MASTER OT (= new object) detection
  75. GRB 180722A: MASTER second inspection
  76. GRB 180720B: MASTER Global Net OT observations
  77. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  78. GRB 180718A: Fermi GBM detection
  79. Konus-Wind observation of GRB 180623A
  80. GRB 180623A: Swift detection of a burst
  81. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  82. GRB 180605A: Fermi GBM observation
  83. Konus-Wind observation of GRB 180523A
  84. Swift trigger 831888: misidentification of 4U 1416-62
  85. GRB 180504A: Swift-BAT refined analysis
  86. Konus-Wind observation of GRB 180427A
  87. Konus-Wind observation of GRB 180316A
  88. GRB 180325A: Swift-XRT refined Analysis
  89. GRB 180224A: Swift/UVOT Detection
  90. Konus-Wind observation of GRB 180111A
  91. GRB 180113A: Swift-BAT refined analysis
  92. GRB 180102A: Swift-BAT refined analysis
  93. IceCube-171106A: Konus-Wind upper limits
  94. GRB 171209A: Swift-BAT refined analysis
  95. GRB 171112A: MAXI/GSC detection
  96. IceCube-171106A: Swift Observations
  97. GRB 171027A, Swift-BAT refined analysis
  98. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  99. Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
  100. Swift Trigger 775946 is a Galactic transient, not GRB 171003

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