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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').

551 results found.

  1. GRB 240419B: Swift-BAT refined analysis
  2. LIGO/Virgo/KAGRA S240422ed: NOT J-band upper limit on the Swift/XRT source S240422ed_X61
  3. LIGO/Virgo/KAGRA S240422ed: WINTER J-band upper limits on the Swift/XRT source S240422ed_X61
  4. LIGO/Virgo/KAGRA S240422ed: GW-MMADS DECam upper limits on the Swift/XRT source S240422ed_X61
  5. Swift GRB 240419B: Global MASTER-Net observations report
  6. GRB 240414A: Swift-BAT refined analysis
  7. LIGO/Virgo/KAGRA S240413p: Global MASTER-Net observations report
  8. Swift Trigger 1220736: detection of 4U 1543-62.
  9. Fermi GRB 240408A: Global MASTER-Net observations report
  10. Konus-Wind detection of LXT 240402A/GRB 240402B
  11. Konus-Wind detection of GRB 240303B
  12. GRB 240109A: Swift-BAT refined analysis
  13. GRB 231215A: radio detection with the VLA
  14. GRB 231129A: Swift-BAT refined analysis
  15. GRB 231129A: BOOTES-5/JGT optical upper limit
  16. GRB 231118A: Swift-BAT refined analysis
  17. GRB 231111A: Swift-BAT refined analysis
  18. LIGO/Virgo/KAGRA S231029ai: Global MASTER-Net observations report
  19. IceCube Alert 231027.18: Global MASTER-Net observations report
  20. GRB 230911C: Swift-BAT refined analysis
  21. GRB 230826A: Swift-BAT refined analysis
  22. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  23. Fermi GRB 230827A: Global MASTER-Net observations report
  24. Swift GRB230825.75: Global MASTER-Net observations report
  25. Fermi GRB 230814A: Global MASTER-Net observations report
  26. Swift GRB230728.12: Global MASTER-Net observations report
  27. LIGO/Virgo S230622e: Global MASTER-Net observations report
  28. LIGO/Virgo S230615be: Global MASTER-Net observations report
  29. LIGO/Virgo/KAGRA S230518h: GECKO tiling observations with KMTNet
  30. GRB 230430A: AstroSat CZTI detection
  31. IPN triangulation of GRB 230418A (short)
  32. Fermi GRB 230402A: Global MASTER-Net observations report
  33. Trigger 1160641: Swift detection of 4U 1630-472 (a.k.a. SWIFT J1633.8-4724A)
  34. Fermi GRB 230227A: Global MASTER-Net observations report
  35. Fermi GRB 230215A: Global MASTER-Net observations report
  36. GRB 221231A: Fermi GBM Observation
  37. GRB 230101A: AstroSat CZTI detection
  38. Fermi GRB 221223A: Global MASTER-Net observations report
  39. GRB 221216A: Swift-XRT refined Analysis
  40. Fermi trigger No 687190301: Global MASTER-Net observations report
  41. GRB 220831A: ATCA 5/9 GHz radio observations
  42. GRB 220711B: Fermi GBM Detection
  43. GRB 220624A: Fermi GBM Detection
  44. Fermi GRB 220623B: Global MASTER-Net observations report
  45. GRB 220623A: Swift-XRT observations
  46. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  47. Swift GRB220521.97: Global MASTER-Net observations report
  48. GRB 220514B: MAXI/GSC detection
  49. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  50. MAXI GRB220506.27: Global MASTER-Net observations report
  51. IceCube Alert 220501.95: Global MASTER-Net observations report
  52. GRB 220319A: Mondy optical uper limit
  53. GRB 220315A: MASTER Global Robotic Net optical observations
  54. Konus-Wind detection of GRB 220310A
  55. Fermi trigger No 668410535: Global MASTER-Net observations report
  56. Swift GRB 220306B: Global MASTER-Net observations report
  57. Konus-Wind observation of GRB 220219B
  58. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  59. GRB 220130A: Fermi GBM Observation
  60. Konus-Wind detection of GRB 220107A
  61. Konus-Wind detection of GRB 210928A
  62. Swift GRB 210919A: Global MASTER-Net observations report
  63. Konus-Wind detection of GRB 210905A
  64. Integral GRB210829.17: Global MASTER-Net observations report
  65. Integral GRB210829.14: Global MASTER-Net observations report
  66. GRB 210807C: Fermi GBM detection
  67. Trigger 1062273: Swift detection of 4U 1700-377
  68. Konus-Wind detection of GRB 210702A
  69. Fermi trigger No 646194855: Global MASTER-Net observations report
  70. Swift GRB210618.07: Global MASTER-Net observations report
  71. Swift-BAT Trigger 1055000/GRB210612.54: MASTER optical source observation
  72. Swift-BAT Trigger 1055000: Swift detection of an outburst from 4U 1543-47
  73. Swift Detection of probable new Swift SGR J1555.2-5402
  74. Fermi GRB 210528A: Global MASTER-Net observations report
  75. GRB 210521A: MAXI/GSC detection
  76. GRB 210514A: update on the BAT trigger time and burst duration
  77. Swift trigger 1047857 is 4U 1700-377
  78. Swift Trigger 1045571 is not a GRB
  79. GRB 210419A: Swift-BAT refined analysis
  80. GRB 210410A: Swift-XRT refined Analysis
  81. Fermi trigger No 639199407: Global MASTER-Net observations report
  82. GRB 210403A: Swift-BAT refined analysis
  83. GRB 210318B: Swift-BAT refined analysis
  84. GRB 210204A: AstroSat CZTI Detection
  85. GECAM detection of a burst possibly from the X-ray burster 4U 0614+09 or GRB 210124A
  86. Fermi GRB 210120A: Global MASTER-Net observations report
  87. Fermi trigger No 631602681: Global MASTER-Net observations report
  88. GRB 210104A: GWAC-F60A optical afterglow observations
  89. Konus-Wind detection of GRB 201216C
  90. IceCube Alert 201014.09: Global MASTER-Net observations report
  91. GRB 201004A: Fermi GBM Final Localization
  92. Fermi trigger No 622618714: Global MASTER-Net observations report
  93. IPN triangulation of GRB 200916B (short)
  94. GRB 200903A: Fermi GBM detection
  95. Swift Trigger 992444 is due to detector noise
  96. Swift Trigger 990358 is due to detector noise
  97. Swift Trigger 989458 is due to detector noise
  98. Fermi GRB 200723A: Global MASTER-Net observations report
  99. GRB 200630A: Swift-BAT refined analysis
  100. GRB 200529A: Swift-BAT refined analysis

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