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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"

43753 results found.

  1. GRB 160303A: 9.8 GHz VLA upper limit
  2. GRB 160303A, Swift-BAT refined analysis
  3. GRB 160303A: MMT Optical Detection
  4. GRB 160303A: Continued RATIR Optical and NIR Observations
  5. LIGO/Virgo G211117: GRAWITA LBT follow-up of PS15dpn
  6. GRB 160303A: GROND Optical Detection
  7. GRB 160303A: Observations from T150 OSN
  8. GRB 160303A: VLT/FORS2 afterglow obervations
  9. GRB 160303A: BOAO R-band Detection
  10. GRB 160303A: McDonald 2.1m CQUEAN Detection
  11. GRB 160303A iTelescope observation
  12. GRB 160303A: Swift-XRT refined Analysis
  13. GRB 160303A: Optical observations from the NOT
  14. Swift possibly triggered on IGR17091-3624
  15. GRB 160303A: Swift/UVOT Detection
  16. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  17. GRB 160303A: Enhanced Swift-XRT position
  18. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  19. GRB 160303A: LCOGT-FTN optical observations
  20. GRB 160303A: ISON-NM early optical early limits
  21. GRB 160303A: Swift detection of a burst, possibly short
  22. GRB 160227A: LOAO 1.0m optical detection
  23. GRB 160227A: McDonald 0.8m Detection
  24. GRB 160227A: Swift/UVOT Detection
  25. GRB160228A: Further analyses on spectral lag and extended emission
  26. GRB 160228A: Mondy optcial observations
  27. GRB 160228A: RATIR Optical and NIR Observations
  28. GRB 160228A: MASTER-Amur prompt observations
  29. GRB 160228A: Swift-XRT refined Analysis
  30. GRB 160227A: MASTER prompt OT Detection and LC
  31. GRB 160227A: AROMA-N Optical Observation
  32. GRB 160228A: GROND Afterglow Candidate
  33. GRB 160228A: Swift-BAT refined analysis
  34. GRB 160228A: optical observations
  35. GRB 160227B: Fermi GBM detection
  36. GRB 160228A: Enhanced Swift-XRT position
  37. GRB 160227A: NOT redshift
  38. GRB 160228A: Prompt enhanced Swift-XRT position
  39. GRB 160228A: Swift detection of a burst
  40. GRB 160227A, Swift-BAT refined analysis
  41. GRB 160227A: Swift-XRT refined Analysis
  42. GRB 160227A: Enhanced Swift-XRT position
  43. GRB 160227A: MAXI/GSC detection
  44. GRB 160225A: TSHAO optical afterglow detection
  45. GRB 160227A: ISON-Kislovodsk optical observation
  46. GRB 160227A: Mt. Terskol observatory optical observation
  47. GRB 160227A: MASTER OT Detection
  48. GRB 160227A: Swift detection of a burst with an optical counterpart
  49. GRB 160225B: Fermi GBM detection
  50. IPN Triangulation of GRB 160225B
  51. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 follow up observations
  52. GRB 160225A: Continued RATIR Optical and NIR Observations
  53. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  54. GRB 160225A: Swift-BAT refined analysis
  55. Fermi GBM trigger 478156376/16022621 is not a GRB
  56. GRB 160225A: MASTER-Amur observations
  57. GRB 160225A: RATIR Optical and NIR Observations
  58. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  59. GRB 160225A: Swift-XRT refined Analysis
  60. GRB 160225A: NOT optical observations
  61. GRB 160225A: WHT LIRIS observations
  62. GRB 160223A: RATIR Optical and NIR Observations
  63. GRB 160225A: TSHAO optical upper limit
  64. GRB 160225A: Enhanced Swift-XRT position
  65. GRB 160225A: MASTER-Amur early observations
  66. GRB 160225A: Swift detection of a burst
  67. GRB 160223A: Swift-XRT afterglow detection
  68. GRB 160221A: Swift-XRT afterglow detection
  69. GRB 160223A: AbAO optical observations
  70. Swift trigger 675784 is probably not an astrophysical source
  71. Konus-Wind observation of GRB 160219A
  72. GRB 160223B: MASTER-Amur early observations
  73. Fermi GBM trigger 477460274/160218161 is not a GRB
  74. Fermi GBM trigger 477985003/160224234 is not a GRB
  75. GRB 160223A: Swift-BAT refined analysis
  76. GRB 160223B: Khureltogot optical observations
  77. GRB 160223A: Fermi GBM observation
  78. GRB 160223B: Swift-XRT observations
  79. GRB 160223B: LCOGT-FTN optical observations
  80. GRB 160223B: Fermi GBM observation
  81. GRB 160223B: Swift ToO observations
  82. GRB 160223B: A long GRB detected by INTEGRAL
  83. GRB 160223A: GROND optical/NIR afterglow
  84. GRB 160223A: Swift detection of a burst
  85. GRB 160221A: Fermi GBM observation
  86. LVC GW 150914: TAROT/TZAC Final analysis correction
  87. GRB 160221A: GROND upper limits
  88. GRB 160220B: Further GROND Observations
  89. Further Swift/UVOT observations of GRB 160220B
  90. GRB 160221A: Swift-XRT observations
  91. GRB 160221A: MASTER-SAAO early observations
  92. LVC GW 150914: TAROT/TZAC Final analysis
  93. GRB 160221A: Swift ToO observations
  94. GRB 160221A: A long GRB detected by INTEGRAL
  95. Konus-Wind observation of GRB 160220B
  96. Swift trigger 674752 is likely due to a noise fluctuation
  97. GRB 160220B: Swift-BAT refined analysis
  98. GRB 160220B: GROND Observations
  99. GRB 160219A: Fermi GBM detection
  100. GRB 160220A: nIR observations at AAT

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