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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"

19702 results found.

  1. GRB 131127A: RATIR Rejection of High-z Candidate
  2. GRB 131125A: MASTER-Net very early optical observations
  3. GRB 131127A: CQUEAN riz Observation
  4. GRB 131128A: GROND observations of the afterglow
  5. GRB 131128A: Swift/UVOT Detection
  6. GRB 131128A: AROMA-N Optical Observation
  7. GRB 131128A: T100 observations
  8. GRB 131128A: Enhanced Swift-XRT position
  9. GRB 131128A: Swift detection of a burst
  10. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  11. GRB 131127A: Swift/UVOT Upper Limits
  12. GRB 131127A: AROMA-N Optical Observation
  13. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  14. GRB 131127A: Swift-XRT refined Analysis
  15. GRB 131127A, Swift-BAT refined analysis
  16. GRB 131127A: Enhanced Swift-XRT position
  17. GRB 131127A: Mondy optical upper limit
  18. GRB 131127A: Nanshan optical upper limit
  19. GRB 131127A: Swift detection of a burst
  20. GRB 131122A: Swift/UVOT Upper Limits
  21. GRB 131122A: Swift-XRT observations
  22. GRB 131122A: i-band observations from NOT
  23. GRB 131122A: Nanshan optical upper limit
  24. Konus-Wind observation of GRB 131118A
  25. IPN Triangulation of GRB 131118A
  26. GRB 131030A, Optical Observations
  27. GRB 131117A: TAROT La Silla observatory optical observations
  28. GRB 131117A: Swift/UVOT Detection
  29. GRB 131117A: Swift-XRT refined Analysis
  30. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  31. GRB 131117A: Enhanced Swift-XRT position
  32. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  33. GRB 131117A: Swift detection of a burst
  34. GRB 131110A: Swift-XRT and UVOT upper limits
  35. GRB 131031A: Mondy optical observations
  36. GRB 131108A: ISON Blagoveshensk upper limit
  37. GRB 131108A: optical observations
  38. GRB 131108A: Continued RATIR Optical and NIR Observations
  39. GRB 131030A: MITSuME Akeno Optical observation
  40. GRB 131108A: AGILE/GRID observation
  41. GRB 131108A: Swift/UVOT Detection
  42. GRB 131108A: RATIR Optical and NIR Observations
  43. GRB 131108A: Swift-XRT observations
  44. GRB 131108A: TAROT-Calern optical observation
  45. GRB 131108A: NOT optical observations
  46. GRB 131108A: 1.23m CAHA optical candidate
  47. GRB 131108A: Fermi-LAT onboard detection of a burst
  48. GRB 131030A: RATIR Optical and NIR Upper Limits
  49. GRB 131030A: Continued RATIR Optical and NIR Observations
  50. GRB 131103A: Swift-BAT refined analysis
  51. GRB 131030A: Swift-BAT refined analysis
  52. GRB 131105A: Swift/UVOT Upper Limits
  53. GRB 131105A: TAROT La Silla observatory optical observations
  54. GRB 131105A: Enhanced Swift-XRT position
  55. GRB 131105A: VLT/X-shooter optical afterglow candidate
  56. GRB 131105A: Swift detection of a burst
  57. GRB 131103A: NOT and VLT observations
  58. GRB 131030A: Continued RATIR Optical and NIR Observations
  59. GRB 131103A: Swift/UVOT Detection
  60. GRB 131103A: Enhanced Swift-XRT position
  61. GRB 131103A: Swift detection of a burst
  62. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  63. GRB131031A: RATIR Optical and NIR Observations
  64. GRB 131018B: RATIR Optical/NIR Observations
  65. GRB 131030A: Continued RATIR Optical and NIR Observations
  66. GRB 131030A: the 2nd epoch of SAO RAS observations
  67. GRB 131031A: Swift/UVOT Upper Limits
  68. LOAO B,R Observation of GRB131030A
  69. GRB 131031A: MASTER optical observation
  70. GRB 131030A: Bassano Bresciano Observatory optical observations
  71. GRB 131031A: 1.23m CAHA afterglow candidate
  72. GRB 131031A: Swift-XRT observations
  73. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  74. GRB 131031A found in ground analysis of BAT data
  75. GRB 131030A: RATIR Optical and NIR Observations
  76. GRB 131030A: TAROT La Silla observatory optical observations
  77. GRB 131030A: Enhanced Swift-XRT position
  78. GRB 131030A: Swift/UVOT Detection
  79. GRB 131030A: SAO RAS optical observations
  80. GRB 131030A: D50+BART detection and light curve optical decay
  81. GRB 131029A: Nanshan optical observations
  82. GRB 131029A: Swift-XRT follow up
  83. GRB 131030A: Swift detection of a burst with an optical counterpart
  84. GRB 131029A: Fermi-LAT detection of a burst
  85. IPN Triangulation of GRB 131028A (long/bright)
  86. Swift 575905/GRB 131026A: optical observations
  87. Swift-BAT Trigger 575905 is probably not a real source
  88. GRB 131024B: AAO optical upper limit
  89. GRB 131024B: Mondy optical upper limits
  90. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  91. GRB 131026A: TAROT La Silla observatory optical observations
  92. Swift Trigger 575905: a possible GRB
  93. GRB 131024B: RATIR Optical and NIR Observations
  94. GRB 131024B: Swift/UVOT Upper Limits
  95. GRB 131024B: Swift-XRT refined Analysis
  96. GRB 131024B: Nanshan optical upper limit
  97. GRB 131024A: Swift/UVOT Upper Limits
  98. GRB 131024B: Enhanced Swift-XRT position
  99. GRB 131024A: GROND upper limits
  100. GRB 131024B: Swift detection of a burst

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