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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"

27223 results found.

  1. Swift possibly triggered on IGR17091-3624
  2. GRB 160303A: Swift/UVOT Detection
  3. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  4. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  5. GRB 160303A: LCOGT-FTN optical observations
  6. GRB 160303A: ISON-NM early optical early limits
  7. GRB 160303A: Swift detection of a burst, possibly short
  8. GRB 160228A: Swift/UVOT Upper Limits
  9. GRB 160227A: Swift/UVOT Detection
  10. GRB 160228A: RATIR Optical and NIR Observations
  11. GRB 160228A: MASTER-Amur prompt observations
  12. GRB 160228A: Swift-XRT refined Analysis
  13. GRB 160227A: MASTER prompt OT Detection and LC
  14. GRB 160227A: AROMA-N Optical Observation
  15. GRB 160228A: GROND Afterglow Candidate
  16. GRB 160228A: Swift-BAT refined analysis
  17. GRB 160227B: Fermi GBM detection
  18. GRB 160228A: Swift detection of a burst
  19. GRB 160227A, Swift-BAT refined analysis
  20. GRB 160227A: Swift-XRT refined Analysis
  21. GRB 160227A: MAXI/GSC detection
  22. GRB 160227A: ISON-Kislovodsk optical observation
  23. GRB 160227A: MASTER OT Detection
  24. GRB 160227A: Swift detection of a burst with an optical counterpart
  25. GRB 160225B: Fermi GBM detection
  26. IPN Triangulation of GRB 160225B
  27. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 follow up observations
  28. GRB 160225A: Continued RATIR Optical and NIR Observations
  29. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  30. GRB 160225A: Swift-BAT refined analysis
  31. Fermi GBM trigger 478156376/16022621 is not a GRB
  32. GRB 160225A: MASTER-Amur observations
  33. GRB 160225A: RATIR Optical and NIR Observations
  34. GRB 160225A: Swift/UVOT Upper Limits
  35. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  36. GRB 160225A: Swift-XRT refined Analysis
  37. GRB 160223A: RATIR Optical and NIR Observations
  38. GRB 160225A: MASTER-Amur early observations
  39. GRB 160225A: Swift detection of a burst
  40. Swift trigger 675784 is probably not an astrophysical source
  41. Konus-Wind observation of GRB 160219A
  42. GRB 160223B: MASTER-Amur early observations
  43. Fermi GBM trigger 477460274/160218161 is not a GRB
  44. Fermi GBM trigger 477985003/160224234 is not a GRB
  45. GRB 160223A: Swift-BAT refined analysis
  46. GRB 160223A: Fermi GBM observation
  47. GRB 160223B: LCOGT-FTN optical observations
  48. GRB 160223B: Fermi GBM observation
  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. GRB 160220B: Further GROND Observations
  54. GRB 160221A: MASTER-SAAO early observations
  55. Konus-Wind observation of GRB 160220B
  56. Swift trigger 674752 is likely due to a noise fluctuation
  57. GRB 160220B: Swift-BAT refined analysis
  58. GRB 160220B: GROND Observations
  59. GRB 160219A: Fermi GBM detection
  60. GRB 160220A: nIR observations at AAT
  61. GRB 160220A: Swift-XRT refined Analysis
  62. GRB 160220A: Swift-BAT refined analysis
  63. GRB160220B: Swift/UVOT observations
  64. GRB 160220B: Swift-XRT refined Analysis
  65. IPN Triangulation of GRB 160219A (short/hard)
  66. GRB160220A: Swift/UVOT observations
  67. Swift Trigger 674752 is likely a noise fluctuation in the direction of IGR17488-3253
  68. GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
  69. GRB 160220B: Swift detection of a burst
  70. GRB 160220A: MASTER-Amur observations
  71. GRB 160220A: GROND Optical/NIR Upper Limits
  72. GRB 160220A: Fermi GBM observation
  73. GRB 160220A: Swift-XRT observations
  74. GRB 160220A: Swift detection of a burst
  75. LIGO/Virgo G184098: MASTER arhival results
  76. GRB 160216A: Swift-BAT refined analysis
  77. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  78. GRB 160216A: Swift-XRT refined Analysis
  79. GRB 160216A: Swift/UVOT Upper Limits
  80. GRB 160216A: Swift detection of a burst
  81. LIGO/Virgo G184098: MAXI/GSC search for an X-ray counterpart of GW150914
  82. Fermi GBM trigger 477254668/160215781 is not a GRB
  83. GRB 160206A: Kiso/KWFC optical observations
  84. GRB 160203A: RATIR Upper Limits
  85. GRB 160206B: Fermi GBM detection
  86. LIGO/Virgo G211117: LOFAR follow-up
  87. Swift Trigger 672897 is probably not an astrophysical event
  88. GRB 151215A: TAROT Calern observatory very early optical detection
  89. GRB 160206A: Swift/UVOT observations
  90. GRB 160203A: Zadko observatory - Gingin optical detection
  91. GRB 160203A: Swift-BAT refined analysis
  92. GRB 160206A: GROND Observations
  93. GRB 160206B: iPTF P48 Observations and Optical Transient Candidates
  94. GRB 160203A: RATIR Optical Observations
  95. GRB 160131A: RATIR Optical Observations
  96. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  97. GRB 160203A: Swift-XRT refined Analysis
  98. GRB 160203A: Swift/UVOT Detection
  99. The bright GRB160203A: X-shooter spectroscopy and redshift
  100. GRB 160203A: LCOGT-Cerro Tololo optical afterglow confirmation

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