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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"

19685 results found.

  1. GRB 160313A: TAROT Calern observatory optical observations
  2. GRB 160313A: Enhanced Swift-XRT position
  3. GRB 160313A: RATIR Optical and NIR Observations
  4. GRB 160313A: SAO RAS observations
  5. GRB 160313A: Swift detection of a burst
  6. GRB 160310A: Further NOT observations
  7. GRB 160310A: Swift/UVOT Upper Limits
  8. GRB 160310A: RATIR Optical and NIR Observations
  9. GRB 160310A: NOT optical observations
  10. GRB 160310A: LCOGT-SAAO optical upper limits
  11. GRB 160303A: GTC imaging of possible host galaxy
  12. GRB 160310A: Swift ToO observations
  13. GRB 160310A: Fermi-LAT detection
  14. LIGO/Virgo G211117: HAWC follow-up of northern sky
  15. Swift trigger 677890 is noise
  16. GRB 160303A: Continued optical monitoring from NOT
  17. GRB160303A: further GROND observations
  18. GRB 160303A: 9.8 GHz VLA upper limit
  19. GRB 160303A, Swift-BAT refined analysis
  20. GRB 160303A: Continued RATIR Optical and NIR Observations
  21. GRB 160303A: GROND Optical Detection
  22. GRB 160303A: Observations from T150 OSN
  23. GRB 160303A: VLT/FORS2 afterglow obervations
  24. GRB 160303A: BOAO R-band Detection
  25. GRB 160303A: McDonald 2.1m CQUEAN Detection
  26. GRB 160303A iTelescope observation
  27. GRB 160303A: Optical observations from the NOT
  28. Swift possibly triggered on IGR17091-3624
  29. GRB 160303A: Swift/UVOT Detection
  30. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  31. GRB 160303A: Enhanced Swift-XRT position
  32. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  33. GRB 160303A: MITSuME Okayama upper limits
  34. GRB 160303A: ISON-NM early optical early limits
  35. GRB 160303A: Swift detection of a burst, possibly short
  36. GRB 160227A: LOAO 1.0m optical detection
  37. GRB 160227A: McDonald 0.8m Detection
  38. GRB 160228A: Swift/UVOT Upper Limits
  39. GRB 160227A: Swift/UVOT Detection
  40. GRB 160228A: Mondy optcial observations
  41. GRB 160228A: RATIR Optical and NIR Observations
  42. GRB 160228A: Swift-XRT refined Analysis
  43. GRB 160227A: MASTER prompt OT Detection and LC
  44. GRB 160227A: AROMA-N Optical Observation
  45. GRB 160228A: GROND Afterglow Candidate
  46. GRB 160228A: optical observations
  47. GRB 160227B: Fermi GBM detection
  48. GRB 160228A: Enhanced Swift-XRT position
  49. GRB 160227A: NOT redshift
  50. GRB 160228A: Swift detection of a burst
  51. GRB 160227A: Enhanced Swift-XRT position
  52. GRB 160227A: ISON-Kislovodsk optical observation
  53. GRB 160227A: Mt. Terskol observatory optical observation
  54. GRB 160227A: Swift detection of a burst with an optical counterpart
  55. GRB 160225A: LOAO optical upper limit
  56. IPN Triangulation of GRB 160225B
  57. GRB 160225A: Continued RATIR Optical and NIR Observations
  58. GRB 160225A: RATIR Optical and NIR Observations
  59. GRB 160225A: Swift/UVOT Upper Limits
  60. GRB 160225A: NOT optical observations
  61. GRB 160225A: WHT LIRIS observations
  62. GRB 160225A: MITSuME Okayama Optical Observation
  63. GRB 160223A: RATIR Optical and NIR Observations
  64. GRB 160225A: Enhanced Swift-XRT position
  65. GRB 160225A: Swift detection of a burst
  66. GRB 160221A: Swift-XRT afterglow detection
  67. GRB 160223A: AbAO optical observations
  68. GRB 160223A: Swift-BAT refined analysis
  69. GRB 160223B: Khureltogot optical observations
  70. GRB 160223B: Swift-XRT observations
  71. GRB 160223B: Swift ToO observations
  72. GRB 160223A: GROND optical/NIR afterglow
  73. LVC GW 150914: TAROT/TZAC Final analysis correction
  74. GRB 160221A: GROND upper limits
  75. GRB 160220B: Further GROND Observations
  76. Further Swift/UVOT observations of GRB 160220B
  77. LVC GW 150914: TAROT/TZAC Final analysis
  78. GRB 160221A: Swift ToO observations
  79. GRB 160220B: GROND Observations
  80. GRB 160220A: nIR observations at AAT
  81. GRB160220B: Swift/UVOT observations
  82. GRB 160220B: Swift-XRT refined Analysis
  83. IPN Triangulation of GRB 160219A (short/hard)
  84. LIGO/Virgo GW150914
  85. GRB160220B: Enhanced Swift-XRT position
  86. GRB160220A: Swift/UVOT observations
  87. GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
  88. GRB 160220A: GROND Optical/NIR Upper Limits
  89. GRB 160220A: Enhanced Swift-XRT position
  90. GRB 160220A: Swift-XRT observations
  91. GRB 160216A: Swift-XRT refined Analysis
  92. LIGO/Virgo G184098: Correction for GCN Circular 18361
  93. GRB 160216A: Swift/UVOT Upper Limits
  94. GRB 160216A: Enhanced Swift-XRT position
  95. GRB 160216A: Swift detection of a burst
  96. GRB 160206A: Kiso/KWFC optical observations
  97. GRB 160203A: RATIR Upper Limits
  98. LIGO/Virgo G211117: LOFAR follow-up
  99. Swift Trigger 672897 is probably not an astrophysical event
  100. GRB 151215A: TAROT Calern observatory very early optical detection

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