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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

42583 results found.

  1. GRB 131117A: Swift-XRT refined Analysis
  2. GRB 131117A: VLT/X-shooter redshift
  3. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  4. GRB 131117A: Enhanced Swift-XRT position
  5. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  6. GRB 131117A: Swift detection of a burst
  7. GRB 130925A: HST imaging
  8. GRB 131110A BAT refined analysis
  9. GRB 131031A: Mondy optical observations
  10. GRB 131108A: ISON Blagoveshensk upper limit
  11. GRB 131108A: optical observations
  12. GRB 131110A found in ground analysis of BAT slew event data
  13. GRB 131108A: Continued RATIR Optical and NIR Observations
  14. Konus-Wind observation of GRB 131108A
  15. GRB 131108A: AGILE/GRID observation
  16. GRB 131108A: CARMA 3mm detection
  17. GRB 131108A: Fermi GBM observation
  18. GRB 131108A: Swift/UVOT Detection
  19. GRB 131108A: RATIR Optical and NIR Observations
  20. GRB 131108A: Swift-XRT observations
  21. GRB 131108A: TAROT-Calern optical observation
  22. GRB 131108A: Fermi-LAT refined analysis
  23. GRB 131108A: NOT optical observations
  24. GRB 131108A: Redshift from 10.4m GTC
  25. GRB 131108A: 1.23m CAHA optical candidate
  26. GRB 131108A: Swift detection of a possible X-ray afterglow
  27. IPN triangulation of GRB 131108A
  28. GRB 131108A Tiled Swift observations
  29. GRB 131108A: Fermi-LAT onboard detection of a burst
  30. GRB 131030A: RATIR Optical and NIR Upper Limits
  31. GRB 131030A: Continued RATIR Optical and NIR Observations
  32. GRB 131031A: Swift-XRT afterglow confirmation
  33. GRB 131029A: Suzaku WAM observation of the prompt emission
  34. GRB 131105A, Swift-BAT refined analysis
  35. GRB 131105A: Swift-XRT refined Analysis
  36. GRB 131103A: Swift-BAT refined analysis
  37. GRB 131030A: Swift-BAT refined analysis
  38. GRB 131105A: Fermi GBM observation
  39. GRB 131024B: Suzaku WAM observation of the prompt emission
  40. Konus-Wind observation of GRB 131105A
  41. GRB 131103A: VLT/X-shooter redshift
  42. GRB 131105A: VLT/X-shooter redshift
  43. GRB 131105A: TAROT La Silla observatory optical observations
  44. GRB 131105A: Enhanced Swift-XRT position
  45. GRB 131105A: VLT/X-shooter optical afterglow candidate
  46. GRB 131105A: Swift detection of a burst
  47. GRB 131103A: NOT and VLT observations
  48. GRB 131030A: Continued RATIR Optical and NIR Observations
  49. GRB 131103A: Swift/UVOT Detection
  50. GRB 131103A: Enhanced Swift-XRT position
  51. GRB 131103A: Swift-XRT refined Analysis
  52. GRB 131103A: Swift detection of a burst
  53. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  54. GRB131031A: RATIR Optical and NIR Observations
  55. GRB 131018B: RATIR Optical/NIR Observations
  56. GRB 131030A: Continued RATIR Optical and NIR Observations
  57. GRB 131030A: the 2nd epoch of SAO RAS observations
  58. GRB 131031A: Fermi GBM detection
  59. LOAO B,R Observation of GRB131030A
  60. GRB 131018B: Further Swift-XRT observations.
  61. GRB 131030A - RoboPol optical afterglow polarimetry
  62. GRB 131031A: MASTER optical observation
  63. Konus-Wind observation of GRB 131031A
  64. GRB 131030A: Bassano Bresciano Observatory optical observations
  65. GRB 131031A: 1.23m CAHA afterglow candidate
  66. GRB131030A : xinglong TNT optical observation
  67. GRB 131031A: Swift-XRT observations
  68. GRB 131030A: P60 observations
  69. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  70. GRB 131031A found in ground analysis of BAT data
  71. GRB 131030A: RATIR Optical and NIR Observations
  72. GRB 131030A: TAROT La Silla observatory optical observations
  73. GRB 131030A: T21 optical observations
  74. GRB 131030A: Swift-XRT refined Analysis
  75. GRB 131030A: Enhanced Swift-XRT position
  76. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  77. GRB 131030A: Swift/UVOT Detection
  78. Konus-Wind observation of GRB 131030A
  79. GRB 131030A: SAO RAS optical observations
  80. GRB 131030A: 1.23m CAHA BVRI-band observations
  81. GRB 131029A: Nanshan optical observations
  82. GRB 131030A: Spectroscopy from 10.4m GTC
  83. GRB 131030A: NOT redshift
  84. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  85. GRB 131030A: MASTER optical observation
  86. GRB 131030A: Swift detection of a burst with an optical counterpart
  87. GRB 131029A: Fermi GBM observation
  88. GRB 131029A Tiled Swift observations
  89. GRB 131029A: Fermi-LAT detection of a burst
  90. Konus-Wind observation of GRB 131028A
  91. IPN Triangulation of GRB 131028A (long/bright)
  92. GRB 131028A: Fermi GBM detection
  93. GRB 131011A: ATCA 34GHz upper limit
  94. Swift 575905/GRB 131026A: optical observations
  95. Swift-BAT Trigger 575905 is probably not a real source
  96. GRB 131024B: AAO optical upper limit
  97. GRB 131024B: Mondy optical upper limits
  98. GRB 131024B: MASTER prompt optical observation
  99. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  100. Swift Trigger 575905: ROTSE-III Optical Limits

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