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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"

37677 results found.

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

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