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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').

559 results found.

  1. GRB 200529A: Swift-BAT refined analysis
  2. GRB 200528A: Swift-BAT refined analysis
  3. Konus-Wind detection of short/hard GRB 200521A
  4. GRB 200519A: Swift-BAT refined analysis
  5. SGR 1935+2154: AstroSat CZTI detection
  6. IceCube-200425A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  7. GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
  8. GRB 200416A: Swift-BAT refined analysis
  9. Fermi trigger No 607537834: Global MASTER-Net observations report
  10. Fermi trigger No 606799116: Global MASTER-Net observations report
  11. Konus-Wind observation of GRB 200313A
  12. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  13. GRB 200227A: Swift-BAT refined analysis
  14. Konus-Wind observation of GRB 200219C
  15. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  16. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  17. Swift GRB200216.56: Global MASTER-Net observations report
  18. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  19. GRB 200131A: Swift-XRT refined Analysis
  20. Fermi trigger No 600666048: Global MASTER-Net observations report
  21. LIGO/Virgo S200105ae: Global MASTER-Net observations report
  22. GRB 191227A: Swift-BAT refined analysis
  23. Swift Trigger 946234: further Swift analysis
  24. GRB 191221B: Swift detection of a burst and a very bright optical candidate
  25. LIGO/Virgo S191220af: Global MASTER-Net observations report
  26. Konus-Wind observation of GRB 191218A
  27. LIGO/Virgo S191216ap: Global MASTER-Net observations report
  28. LIGO/Virgo S191212q: Global MASTER-Net observations report
  29. Fermi trigger No 596808579: Global MASTER-Net observations report
  30. GRB 191106A: Swift-BAT refined analysis
  31. GRB 191031D: Swift-BAT refined analysis
  32. GRB 191031C: Swift-BAT refined analysis
  33. GRB 191031A: Swift-BAT refined analysis
  34. TESS Detection of the Optical Emission from the Possible Untriggered GRB Associated with ZTF19abvizsw
  35. Konus-Wind observation of GRB 191004B
  36. GRB 191004A: Swift-BAT refined analysis
  37. LIGO/Virgo S190930t: J-GEM follow-up observation for Swift J221951-484240
  38. LIGO/Virgo S190930s: No counterpart candidates in KAIT observations
  39. Update to the Fermi GBM Localizations
  40. LIGO/Virgo S190910h: Identification of a GW compact binary merger candidate
  41. LIGO/Virgo S190901ap: No counterpart candidates in KAIT observations
  42. LIGO/Virgo S190901ap : GRAWITA photometric observation of candidate ZTFabvizsw and GCN 25618 revision
  43. LIGO/Virgo S190901ap: Upper limits from CALET observations.
  44. LIGO/Virgo S190901ap: Upper limits from Insight-HXMT/HE observations
  45. LIGO/Virgo S190901ap: Upper limits from Fermi-GBM Observations
  46. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  47. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  48. Integral GRB190828.78 Global MASTER-Net observations report
  49. LIGO/Virgo S190814bv: No candidates found in J-GEM follow-up observations
  50. LIGO/Virgo S190728q: Coverage and upper limits from MAXI/GSC observations
  51. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  52. Fermi trigger No 585007213 Global MASTER-Net observations report
  53. Fermi trigger No 584264100 Global MASTER-Net observations report
  54. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  55. Swift GRB190631. Global MASTER-Net observations report
  56. LIGO/Virgo S190521r: CNEOST follow-up observations
  57. Fermi GRB190520.6 Global MASTER-Net observations report
  58. LIGO/Virgo S190517h: CALET Observations
  59. LIGO/Virgo S190517h: INTEGRAL prompt observation
  60. LIGO/Virgo S190517h: INTEGRAL/SPI-ACS prompt observation
  61. LIGO/Virgo S190510g: J-GEM optical/NIR follow-up observations
  62. LIGO/Virgo S190412m: Further J-GEM optical/NIR observations
  63. GRB 190427A, Swift-BAT refined analysis
  64. LIGO/Virgo S190426c: CNEOST Optical Observations
  65. LIGO/Virgo S190425z: CNEOST Optical Observations
  66. LIGO/Virgo S190426c: SAO optical observation
  67. Fermi GRB190415.17 Global MASTER-Net observations report
  68. MAGIC follow-up of the X-ray flares of LS I +61�303 dete
  69. Swift detection of LS I +61 303
  70. IceCube-190221A: Swift-XRT Follow-up Observations
  71. GRB 190203A: MASTER OT detection
  72. Konus-Wind observation of GRB 190114C
  73. SWIFT GRB190106.57 Global MASTER-Net OT detection
  74. GRB 181126A: Swift/UVOT Upper Limits
  75. GRB 181027A: Fermi GBM detection
  76. GRB 181020A: Swift-XRT refined Analysis
  77. GRB 181010A: REM optical and NIR afterglow detection
  78. Konus-Wind observation of GRB 180828A
  79. GRB 180728B: MASTER optical observations short GRB IPN error box
  80. GRB 180728B: Fermi GBM detection
  81. GRB 180728A: MASTER OT (= new object) detection
  82. GRB 180722A: MASTER second inspection
  83. GRB 180720B: MASTER Global Net OT observations
  84. FRB 180714: MASTER optical inspection of the Fast Rado Burst Transient
  85. GRB 180718A: Fermi GBM detection
  86. Konus-Wind observation of GRB 180623A
  87. GRB 180623A: Swift detection of a burst
  88. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  89. GRB 180605A: Fermi GBM observation
  90. Konus-Wind observation of GRB 180523A
  91. GRB 180504A: Swift-BAT refined analysis
  92. Konus-Wind observation of GRB 180427A
  93. Konus-Wind observation of GRB 180316A
  94. GRB 180325A: Swift-XRT refined Analysis
  95. GRB 180224A: Swift/UVOT Detection
  96. Konus-Wind observation of GRB 180111A
  97. GRB 180113A: Swift-BAT refined analysis
  98. GRB 180102A: Swift-BAT refined analysis
  99. IceCube-171106A: Konus-Wind upper limits
  100. GRB 171209A: Swift-BAT refined analysis

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