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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"

2923 results found.

  1. GRB 160506A: IRSF upper limits
  2. VERITAS rapid follow-up observations of IceCube event 160427A
  3. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  4. LIGO Virgo G211117: Additional MWA Observations
  5. GRB 160409A found in Swift BAT ground analysis
  6. IPN Triangulation of GRB 160406A (short/hard)
  7. LIGO/Virgo G211117: LOFAR follow-up
  8. GRB 160303A SMA observation
  9. GRB 160227A: McDonald 0.8m Detection
  10. GRB 160227A: MAXI/GSC detection
  11. GRB 160225A: TSHAO optical upper limit
  12. Konus-Wind observation of GRB 160220B
  13. GRB 160220A: MASTER-Amur observations
  14. LIGO/Virgo G211117: LOFAR follow-up
  15. GRB 160206A: MAXI/GSC detection
  16. GRB 160203A: Enhanced Swift-XRT position
  17. GRB 160203A: GROND Afterglow Candidate
  18. GRB 160203A: Swift detection of a burst
  19. GRB 160123A: Swift-BAT refined analysis
  20. IPN Triangulation of GRB 151231A
  21. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  22. GRB 160107A: MAXI/GSC detection
  23. IPN Triangulation of GRB 151225A (short/hard)
  24. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  25. GRB 160104B: MAXI/GSC detection
  26. LIGO/Virgo G211117: LOFAR follow-up
  27. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  28. LIGO/Virgo G211117: OAO-WFC NIR follow-up observations
  29. IPN Triangulation of GRB 151227B
  30. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  31. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  32. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  33. GRB 151228B: Fermi GBM observation
  34. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  35. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  36. GRB 151228B: Swift detection of a burst with an optical detection
  37. GRB 151215A: TSHAO optical observations
  38. Swift detection of 4U 1850-03
  39. GRB 130831A: MASTER early OT detection and LC
  40. GRB 151205B: MASTER-NET early optical observations
  41. GRB 151205A: Swift detection of a burst
  42. GRB 151127A iTelescope observation
  43. GRB GRB 151118A: MASTER-NET optical observations
  44. GRB 151111A: GROND marginal detection of a afterglow candidate
  45. GRB 151111A: LCOGT-FTS afterglow observations
  46. GRB 151027A: Mondy optical observations
  47. GRB 150910A: CrAO optical observations
  48. LIGO/Virgo G194575: transients from Pan-STARRS in the RA=1hr localisation region
  49. GRB 151022A: MASTER-Ural observations
  50. GRB 151006A: Mondy optical upper limit
  51. Swift Trigger 658045 is not a GRB
  52. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  53. LIGO/Virgo G184098: VST-ESO PARANAL observations
  54. LIGO/Virgo G184098: Swift follow-up observations
  55. GRB 150907A: Swift-XRT afterglow detection
  56. GRB 150907B: Swift-BAT refined analysis
  57. GRB 150907B: Enhanced Swift-XRT position
  58. GRB 150907B: GROND Upper Limits
  59. GRB 150907B: Swift-XRT observations
  60. GRB 150907A: Swift-XRT observations
  61. GRB 150907A: MAXI/GSC detection
  62. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  63. GRB 150902A: MASTER-SAAO optical observations
  64. Konus-Wind observation of GRB 150902A
  65. GRB 150831B: MASTER-IAC early optical observations
  66. IPN Triangulation of GRB 150824A
  67. Konus-Wind observation of GRB 150818A
  68. GRB 150821A: Swift detection of a burst with an optical afterglow
  69. GRB 150819A: Swift-BAT refined analysis
  70. GRB 150819A: Swift detection of a burst
  71. Fermi GBM trigger 150806450 is not a GRB
  72. GRB 150801B: Enhanced Swift-XRT position
  73. Trigger 649113: Swift detection of SGR 1E 1841-045
  74. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  75. GRB 150710B refined analysis
  76. GRB 150710B detected in ground analysis of BAT data
  77. GRB 150626B, Swift-BAT refined analysis
  78. V404 Cyg: MASTER Swift, Integral alert observations
  79. GRB 150622A: MAXI/GSC detection
  80. GRB 150527A: Swift-XRT refined Analysis
  81. GRB 150527A: Fermi GBM observation
  82. GRB 150518A: Mondy optical observations
  83. GRB 150430A: MAXI/GSC detection
  84. GRB 150413A: CrAO optical observations
  85. GRB 150424B: MAXI/GSC detection
  86. GRB 150424A: Swift detection of a short burst
  87. IPN Triangulation of GRB 150330A (long/very intense)
  88. GRB 150323A: AAO optical observations
  89. GRB 150309A: CrAO optic upper limit
  90. GRB 150301A: Fermi GBM observation
  91. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  92. Fermi GBM Observations of Magnetar 4U 0142+61
  93. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  94. Trigger 631747: Swift detection of 4U 0614+09
  95. GRB 150212A: Swift-XRT refined Analysis
  96. GRB 150212A: MASTER optical observations
  97. GRB150212A: P60 Afterglow Candidate
  98. GRB 150210A: MASTER SN detection during LAT error box inspection
  99. GRB 150204A: GROND observations
  100. GRB 150203A iTelescope observation

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