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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"

27415 results found.

  1. GRB 131122A: Swift-XRT Further Observation
  2. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  3. GRB 131127A: RATIR Rejection of High-z Candidate
  4. GRB 131128A; Fermi GBM observation
  5. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  6. IPN Triangulation of GRB 131126A (short/hard)
  7. GRB 131127A: CQUEAN riz Observation
  8. GRB 131128A: GROND observations of the afterglow
  9. IPN Triangulation of GRB 131125A (short/hard)
  10. GRB 131128A: Swift/UVOT Detection
  11. GRB 131128A: AROMA-N Optical Observation
  12. GRB 131127B: Bassano Bresciano Observatory optical observations
  13. GRB 131128A: Swift-XRT refined Analysis
  14. GRB 131128A: Kanata/HOWPol optical observation
  15. GRB 131128A: T100 observations
  16. GRB 131128A: Swift-BAT refined analysis
  17. GRB 131128A: Nanshan afterglow confirmation
  18. GRB 131128A: Nanshan afterglow candidate
  19. GRB 131128A: Swift detection of a burst
  20. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  21. GRB 131127B: Nanshan optical observations
  22. IPN Triangulation of GRB 131127B
  23. GRB 131127B: Fermi GBM detection
  24. GRB 131127A: Swift/UVOT Upper Limits
  25. GRB 131127A: AROMA-N Optical Observation
  26. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  27. Fermi407254341: iPTF optical afterglow candidates
  28. GRB 131127A: Swift-XRT refined Analysis
  29. GRB 131127A, Swift-BAT refined analysis
  30. GRB 131127A: Nanshan optical upper limit
  31. GRB 131127A: Swift detection of a burst
  32. GRB 131122A: Swift/UVOT Upper Limits
  33. GRB 131122A: Swift-XRT observations
  34. GRB 131122A: Nanshan optical upper limit
  35. GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation
  36. GRB 131120A, Swift-BAT refined analysis
  37. IPN Triangulation of GRB 131118A
  38. GRB 131120A: Swift detection of a burst
  39. Fermi Gamma-ray Burst Monitor trigger 406601061 / 131120031 is not a GRB
  40. GRB 131118A: Fermi GBM detection
  41. GRB 131117A, Swift-BAT refined analysis
  42. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  43. GRB 131117A: TAROT La Silla observatory optical observations
  44. GRB 131117A: Swift/UVOT Detection
  45. GRB 131117A: Swift-XRT refined Analysis
  46. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  47. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  48. GRB 131117A: Swift detection of a burst
  49. GRB 131110A: Swift-XRT and UVOT upper limits
  50. GRB 131110A BAT refined analysis
  51. GRB 131110A found in ground analysis of BAT slew event data
  52. GRB 131108A: Continued RATIR Optical and NIR Observations
  53. GRB 131108A: Fermi GBM observation
  54. GRB 131108A: Swift/UVOT Detection
  55. GRB 131108A: RATIR Optical and NIR Observations
  56. GRB 131108A: Swift-XRT observations
  57. GRB 131108A: TAROT-Calern optical observation
  58. GRB 131108A: Fermi-LAT refined analysis
  59. GRB 131108A: NOT optical observations
  60. GRB 131108A: Swift detection of a possible X-ray afterglow
  61. GRB 131108A: Fermi-LAT onboard detection of a burst
  62. GRB 131030A: RATIR Optical and NIR Upper Limits
  63. GRB 131030A: Continued RATIR Optical and NIR Observations
  64. GRB 131105A, Swift-BAT refined analysis
  65. GRB 131105A: Swift-XRT refined Analysis
  66. GRB 131103A: Swift-BAT refined analysis
  67. GRB 131030A: Swift-BAT refined analysis
  68. GRB 131105A: Fermi GBM observation
  69. GRB 131105A: Swift/UVOT Upper Limits
  70. Konus-Wind observation of GRB 131105A
  71. GRB 131105A: VLT/X-shooter redshift
  72. GRB 131105A: TAROT La Silla observatory optical observations
  73. GRB 131105A: Swift detection of a burst
  74. GRB 131030A: Continued RATIR Optical and NIR Observations
  75. GRB 131103A: Swift/UVOT Detection
  76. GRB 131103A: Swift-XRT refined Analysis
  77. GRB 131103A: Swift detection of a burst
  78. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  79. GRB131031A: RATIR Optical and NIR Observations
  80. GRB 131018B: RATIR Optical/NIR Observations
  81. GRB 131030A: Continued RATIR Optical and NIR Observations
  82. GRB 131031A: Fermi GBM detection
  83. GRB 131031A: Swift/UVOT Upper Limits
  84. LOAO B,R Observation of GRB131030A
  85. GRB 131018B: Further Swift-XRT observations.
  86. GRB 131030A - RoboPol optical afterglow polarimetry
  87. GRB 131031A: MASTER optical observation
  88. GRB 131030A: Bassano Bresciano Observatory optical observations
  89. GRB 131031A: Swift-XRT observations
  90. GRB 131030A: P60 observations
  91. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  92. GRB 131031A found in ground analysis of BAT data
  93. GRB 131030A: RATIR Optical and NIR Observations
  94. GRB 131030A: TAROT La Silla observatory optical observations
  95. GRB 131030A: Swift-XRT refined Analysis
  96. GRB 131030A: Swift/UVOT Detection
  97. Konus-Wind observation of GRB 131030A
  98. GRB 131030A: SAO RAS optical observations
  99. GRB 131030A: D50+BART detection and light curve optical decay
  100. GRB 131029A: Nanshan optical observations

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