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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"

37675 results found.

  1. GRB 160228A: Swift detection of a burst
  2. GRB 160227A, Swift-BAT refined analysis
  3. GRB 160227A: Swift-XRT refined Analysis
  4. GRB 160227A: Enhanced Swift-XRT position
  5. GRB 160227A: MAXI/GSC detection
  6. GRB 160225A: TSHAO optical afterglow detection
  7. GRB 160227A: ISON-Kislovodsk optical observation
  8. GRB 160227A: Mt. Terskol observatory optical observation
  9. GRB 160227A: MASTER OT Detection
  10. GRB 160227A: Swift detection of a burst with an optical counterpart
  11. GRB 160225A: LOAO optical upper limit
  12. GRB 160225B: Fermi GBM detection
  13. IPN Triangulation of GRB 160225B
  14. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 follow up observations
  15. GRB 160225A: Continued RATIR Optical and NIR Observations
  16. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  17. GRB 160225A: Swift-BAT refined analysis
  18. Fermi GBM trigger 478156376/16022621 is not a GRB
  19. GRB 160225A: MASTER-Amur observations
  20. GRB 160225A: RATIR Optical and NIR Observations
  21. GRB 160225A: Swift/UVOT Upper Limits
  22. GRB 160225A: Xinglong TNT optical observation
  23. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  24. GRB 160225A: Swift-XRT refined Analysis
  25. GRB 160225A: NOT optical observations
  26. GRB 160225A: WHT LIRIS observations
  27. GRB 160225A: MITSuME Okayama Optical Observation
  28. GRB 160225A: MITSuME Akeno Optical Observation
  29. GRB 160223A: RATIR Optical and NIR Observations
  30. GRB 160225A: TSHAO optical upper limit
  31. GRB 160225A: Enhanced Swift-XRT position
  32. GRB 160225A: MASTER-Amur early observations
  33. GRB 160225A: Swift detection of a burst
  34. GRB 160223A: Swift-XRT afterglow detection
  35. GRB 160221A: Swift-XRT afterglow detection
  36. GRB 160223A: AbAO optical observations
  37. Konus-Wind observation of GRB 160219A
  38. GRB 160223B: MASTER-Amur early observations
  39. Fermi GBM trigger 477460274/160218161 is not a GRB
  40. Fermi GBM trigger 477985003/160224234 is not a GRB
  41. GRB 160223A: Swift-BAT refined analysis
  42. GRB 160223B: Khureltogot optical observations
  43. GRB 160223A: Fermi GBM observation
  44. GRB 160223B: Swift-XRT observations
  45. GRB 160223B: LCOGT-FTN optical observations
  46. GRB 160223B: Fermi GBM observation
  47. GRB 160223B: Swift ToO observations
  48. GRB 160223B: A long GRB detected by INTEGRAL
  49. GRB 160223A: GROND optical/NIR afterglow
  50. GRB 160223A: Swift detection of a burst
  51. GRB 160221A: Fermi GBM observation
  52. GRB 160221A: GROND upper limits
  53. Correction to the title of Swift GCN 19051
  54. GRB 160220B: Further GROND Observations
  55. Further Swift/UVOT observations of GRB 160220B
  56. GRB 160221A: Swift-XRT observations
  57. GRB 160221A: MASTER-SAAO early observations
  58. GRB 160221A: Swift ToO observations
  59. GRB 160221A: A long GRB detected by INTEGRAL
  60. Konus-Wind observation of GRB 160220B
  61. GRB 160220B: Swift-BAT refined analysis
  62. GRB 160220B: GROND Observations
  63. GRB 160219A: Fermi GBM detection
  64. GRB 160220A: nIR observations at AAT
  65. GRB 160220A: Swift-XRT refined Analysis
  66. GRB 160220A: Swift-BAT refined analysis
  67. GRB160220B: Swift/UVOT observations
  68. GRB 160220B: Swift-XRT refined Analysis
  69. IPN Triangulation of GRB 160219A (short/hard)
  70. LIGO/Virgo GW150914
  71. GRB160220A: Swift/UVOT observations
  72. Swift Trigger 674752 is likely a noise fluctuation in the direction of IGR17488-3253
  73. GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
  74. GRB 160220B: Swift detection of a burst
  75. GRB 160220A: MASTER-Amur observations
  76. GRB 160220A: GROND Optical/NIR Upper Limits
  77. GRB 160220A: Fermi GBM observation
  78. GRB 160220A: Enhanced Swift-XRT position
  79. GRB 160220A: Swift-XRT observations
  80. GRB 160220A: Swift detection of a burst
  81. LIGO/Virgo G184098: MASTER arhival results
  82. GRB 160216A: Swift-BAT refined analysis
  83. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  84. GRB 160216A: Swift-XRT refined Analysis
  85. GRB 160216A: Swift/UVOT Upper Limits
  86. GRB 160216A: Enhanced Swift-XRT position
  87. GRB 160216A: Swift detection of a burst
  88. Fermi GBM trigger 477254668/160215781 is not a GRB
  89. GRB160131A: detection of polarisation by Astrosat CZTI
  90. GRB 160131A: second epoch observations with the GMRT
  91. Low frequency GMRT observations of GRB 160131A
  92. GRB 160206A: Kiso/KWFC optical observations
  93. GRB 160203A: RATIR Upper Limits
  94. GRB 160206B: Fermi GBM detection
  95. GRB 160131A: TSHAO optical observations
  96. GRB 160203A: MITSuME Akeno optical upper limits
  97. GRB 151215A: TAROT Calern observatory very early optical detection
  98. GRB 160206A: Swift/UVOT observations
  99. GRB 160203A: Zadko observatory - Gingin optical detection
  100. GRB 160203A: Swift-BAT refined analysis

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