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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"

23610 results found.

  1. GRB 131128A: Swift/UVOT Detection
  2. GRB 131128A: AROMA-N Optical Observation
  3. GRB 131127B: Bassano Bresciano Observatory optical observations
  4. GRB 131128A: Swift-XRT refined Analysis
  5. GRB 131128A: T100 observations
  6. GRB 131128A: Enhanced Swift-XRT position
  7. GRB 131128A: Swift detection of a burst
  8. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  9. IPN Triangulation of GRB 131127B
  10. GRB 131127B: Fermi GBM detection
  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: Upper limit from NOT imaging
  22. GRB 131122A: Swift-XRT observations
  23. GRB 131122A: i-band observations from NOT
  24. GRB 131122A: Nanshan optical upper limit
  25. IPN Triangulation of GRB 131118A
  26. GRB 131120A: Swift detection of a burst
  27. GRB 131118A: Fermi GBM detection
  28. GRB 131030A, Optical Observations
  29. GRB 131117A: TAROT La Silla observatory optical observations
  30. GRB 131117A: Swift/UVOT Detection
  31. GRB 131117A: Swift-XRT refined Analysis
  32. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  33. GRB 131117A: Enhanced Swift-XRT position
  34. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  35. GRB 131117A: Swift detection of a burst
  36. GRB 131110A: Swift-XRT and UVOT upper limits
  37. GRB 131031A: Mondy optical observations
  38. GRB 131108A: ISON Blagoveshensk upper limit
  39. GRB 131108A: optical observations
  40. GRB 131108A: Continued RATIR Optical and NIR Observations
  41. GRB 131030A: MITSuME Akeno Optical observation
  42. GRB 131108A: AGILE/GRID observation
  43. GRB 131108A: Swift/UVOT Detection
  44. GRB 131108A: RATIR Optical and NIR Observations
  45. GRB 131108A: Swift-XRT observations
  46. GRB 131108A: TAROT-Calern optical observation
  47. GRB 131108A: Fermi-LAT refined analysis
  48. GRB 131108A: NOT optical observations
  49. GRB 131108A: 1.23m CAHA optical candidate
  50. IPN triangulation of GRB 131108A
  51. GRB 131030A: RATIR Optical and NIR Upper Limits
  52. GRB 131030A: Continued RATIR Optical and NIR Observations
  53. GRB 131031A: Swift-XRT afterglow confirmation
  54. GRB 131029A: Suzaku WAM observation of the prompt emission
  55. GRB 131105A: Swift-XRT refined Analysis
  56. GRB 131103A: Swift-BAT refined analysis
  57. GRB 131105A: Fermi GBM observation
  58. GRB 131105A: Swift/UVOT Upper Limits
  59. Konus-Wind observation of GRB 131105A
  60. GRB 131105A: TAROT La Silla observatory optical observations
  61. GRB 131105A: Enhanced Swift-XRT position
  62. GRB 131105A: VLT/X-shooter optical afterglow candidate
  63. GRB 131105A: Swift detection of a burst
  64. GRB 131103A: NOT and VLT observations
  65. GRB 131030A: Continued RATIR Optical and NIR Observations
  66. GRB 131103A: Swift/UVOT Detection
  67. GRB 131103A: Enhanced Swift-XRT position
  68. GRB 131103A: Swift-XRT refined Analysis
  69. GRB 131103A: Swift detection of a burst
  70. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  71. GRB131031A: RATIR Optical and NIR Observations
  72. GRB 131018B: RATIR Optical/NIR Observations
  73. GRB 131030A: Continued RATIR Optical and NIR Observations
  74. GRB 131030A: the 2nd epoch of SAO RAS observations
  75. GRB 131031A: Swift/UVOT Upper Limits
  76. GRB 131018B: Further Swift-XRT observations.
  77. GRB 131031A: MASTER optical observation
  78. GRB 131030A: Bassano Bresciano Observatory optical observations
  79. GRB 131031A: 1.23m CAHA afterglow candidate
  80. GRB 131031A: Swift-XRT observations
  81. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  82. GRB 131031A found in ground analysis of BAT data
  83. GRB 131030A: RATIR Optical and NIR Observations
  84. GRB 131030A: TAROT La Silla observatory optical observations
  85. GRB 131030A: Enhanced Swift-XRT position
  86. GRB 131030A: Swift/UVOT Detection
  87. Konus-Wind observation of GRB 131030A
  88. GRB 131030A: SAO RAS optical observations
  89. GRB 131030A: D50+BART detection and light curve optical decay
  90. GRB 131029A: Nanshan optical observations
  91. GRB 131029A: Swift-XRT follow up
  92. GRB 131030A: Swift detection of a burst with an optical counterpart
  93. GRB 131029A: Fermi-LAT detection of a burst
  94. IPN Triangulation of GRB 131028A (long/bright)
  95. GRB 131028A: Fermi GBM detection
  96. Swift 575905/GRB 131026A: optical observations
  97. Swift-BAT Trigger 575905 is probably not a real source
  98. GRB 131024B: AAO optical upper limit
  99. GRB 131024B: Mondy optical upper limits
  100. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits

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