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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"

43848 results found.

  1. GRB 160303A: GROND Optical Detection
  2. GRB 160303A: Observations from T150 OSN
  3. GRB 160303A: VLT/FORS2 afterglow obervations
  4. GRB 160303A: BOAO R-band Detection
  5. GRB 160303A: McDonald 2.1m CQUEAN Detection
  6. GRB 160303A iTelescope observation
  7. GRB 160303A: Swift-XRT refined Analysis
  8. GRB 160303A: Optical observations from the NOT
  9. Swift possibly triggered on IGR17091-3624
  10. GRB 160303A: Swift/UVOT Detection
  11. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  12. GRB 160303A: Enhanced Swift-XRT position
  13. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  14. GRB 160303A: LCOGT-FTN optical observations
  15. GRB 160303A: ISON-NM early optical early limits
  16. GRB 160303A: Swift detection of a burst, possibly short
  17. GRB 160227A: LOAO 1.0m optical detection
  18. GRB 160227A: McDonald 0.8m Detection
  19. GRB 160227A: Swift/UVOT Detection
  20. GRB160228A: Further analyses on spectral lag and extended emission
  21. GRB 160228A: Mondy optcial observations
  22. GRB 160228A: RATIR Optical and NIR Observations
  23. GRB 160228A: MASTER-Amur prompt observations
  24. GRB 160228A: Swift-XRT refined Analysis
  25. GRB 160227A: MASTER prompt OT Detection and LC
  26. GRB 160227A: AROMA-N Optical Observation
  27. GRB 160228A: GROND Afterglow Candidate
  28. GRB 160228A: Swift-BAT refined analysis
  29. GRB 160228A: optical observations
  30. GRB 160227B: Fermi GBM detection
  31. GRB 160228A: Enhanced Swift-XRT position
  32. GRB 160227A: NOT redshift
  33. GRB 160228A: Prompt enhanced Swift-XRT position
  34. GRB 160228A: Swift detection of a burst
  35. GRB 160227A, Swift-BAT refined analysis
  36. GRB 160227A: Swift-XRT refined Analysis
  37. GRB 160227A: Enhanced Swift-XRT position
  38. GRB 160227A: MAXI/GSC detection
  39. GRB 160225A: TSHAO optical afterglow detection
  40. GRB 160227A: ISON-Kislovodsk optical observation
  41. GRB 160227A: Mt. Terskol observatory optical observation
  42. GRB 160227A: MASTER OT Detection
  43. GRB 160227A: Swift detection of a burst with an optical counterpart
  44. GRB 160225B: Fermi GBM detection
  45. IPN Triangulation of GRB 160225B
  46. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 follow up observations
  47. GRB 160225A: Continued RATIR Optical and NIR Observations
  48. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  49. GRB 160225A: Swift-BAT refined analysis
  50. Fermi GBM trigger 478156376/16022621 is not a GRB
  51. GRB 160225A: MASTER-Amur observations
  52. GRB 160225A: RATIR Optical and NIR Observations
  53. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  54. GRB 160225A: Swift-XRT refined Analysis
  55. GRB 160225A: NOT optical observations
  56. GRB 160225A: WHT LIRIS observations
  57. GRB 160223A: RATIR Optical and NIR Observations
  58. GRB 160225A: TSHAO optical upper limit
  59. GRB 160225A: Enhanced Swift-XRT position
  60. GRB 160225A: MASTER-Amur early observations
  61. GRB 160225A: Swift detection of a burst
  62. GRB 160223A: Swift-XRT afterglow detection
  63. GRB 160221A: Swift-XRT afterglow detection
  64. GRB 160223A: AbAO optical observations
  65. Swift trigger 675784 is probably not an astrophysical source
  66. Konus-Wind observation of GRB 160219A
  67. GRB 160223B: MASTER-Amur early observations
  68. Fermi GBM trigger 477460274/160218161 is not a GRB
  69. Fermi GBM trigger 477985003/160224234 is not a GRB
  70. GRB 160223A: Swift-BAT refined analysis
  71. GRB 160223B: Khureltogot optical observations
  72. GRB 160223A: Fermi GBM observation
  73. GRB 160223B: Swift-XRT observations
  74. GRB 160223B: LCOGT-FTN optical observations
  75. GRB 160223B: Fermi GBM observation
  76. GRB 160223B: Swift ToO observations
  77. GRB 160223B: A long GRB detected by INTEGRAL
  78. GRB 160223A: GROND optical/NIR afterglow
  79. GRB 160223A: Swift detection of a burst
  80. GRB 160221A: Fermi GBM observation
  81. LVC GW 150914: TAROT/TZAC Final analysis correction
  82. GRB 160221A: GROND upper limits
  83. GRB 160220B: Further GROND Observations
  84. Further Swift/UVOT observations of GRB 160220B
  85. GRB 160221A: Swift-XRT observations
  86. GRB 160221A: MASTER-SAAO early observations
  87. LVC GW 150914: TAROT/TZAC Final analysis
  88. GRB 160221A: Swift ToO observations
  89. GRB 160221A: A long GRB detected by INTEGRAL
  90. Konus-Wind observation of GRB 160220B
  91. Swift trigger 674752 is likely due to a noise fluctuation
  92. GRB 160220B: Swift-BAT refined analysis
  93. GRB 160220B: GROND Observations
  94. GRB 160219A: Fermi GBM detection
  95. GRB 160220A: nIR observations at AAT
  96. GRB 160220A: Swift-XRT refined Analysis
  97. GRB 160220A: Swift-BAT refined analysis
  98. GRB160220B: Swift/UVOT observations
  99. GRB 160220B: Swift-XRT refined Analysis
  100. IPN Triangulation of GRB 160219A (short/hard)

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