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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"

27393 results found.

  1. GRB 131127B: Fermi GBM detection
  2. GRB 131127A: Swift/UVOT Upper Limits
  3. GRB 131127A: AROMA-N Optical Observation
  4. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  5. Fermi407254341: iPTF optical afterglow candidates
  6. GRB 131127A: Swift-XRT refined Analysis
  7. GRB 131127A, Swift-BAT refined analysis
  8. GRB 131127A: Nanshan optical upper limit
  9. GRB 131127A: Swift detection of a burst
  10. GRB 131122A: Swift/UVOT Upper Limits
  11. GRB 131122A: Swift-XRT observations
  12. GRB 131122A: Nanshan optical upper limit
  13. GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation
  14. GRB 131120A, Swift-BAT refined analysis
  15. IPN Triangulation of GRB 131118A
  16. GRB 131120A: Swift detection of a burst
  17. Fermi Gamma-ray Burst Monitor trigger 406601061 / 131120031 is not a GRB
  18. GRB 131118A: Fermi GBM detection
  19. GRB 131117A, Swift-BAT refined analysis
  20. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  21. GRB 131117A: TAROT La Silla observatory optical observations
  22. GRB 131117A: Swift/UVOT Detection
  23. GRB 131117A: Swift-XRT refined Analysis
  24. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  25. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  26. GRB 131117A: Swift detection of a burst
  27. GRB 131110A: Swift-XRT and UVOT upper limits
  28. GRB 131110A BAT refined analysis
  29. GRB 131110A found in ground analysis of BAT slew event data
  30. GRB 131108A: Continued RATIR Optical and NIR Observations
  31. GRB 131108A: Fermi GBM observation
  32. GRB 131108A: Swift/UVOT Detection
  33. GRB 131108A: RATIR Optical and NIR Observations
  34. GRB 131108A: Swift-XRT observations
  35. GRB 131108A: TAROT-Calern optical observation
  36. GRB 131108A: Fermi-LAT refined analysis
  37. GRB 131108A: NOT optical observations
  38. GRB 131108A: Swift detection of a possible X-ray afterglow
  39. GRB 131108A: Fermi-LAT onboard detection of a burst
  40. GRB 131030A: RATIR Optical and NIR Upper Limits
  41. GRB 131030A: Continued RATIR Optical and NIR Observations
  42. GRB 131105A, Swift-BAT refined analysis
  43. GRB 131105A: Swift-XRT refined Analysis
  44. GRB 131103A: Swift-BAT refined analysis
  45. GRB 131030A: Swift-BAT refined analysis
  46. GRB 131105A: Fermi GBM observation
  47. GRB 131105A: Swift/UVOT Upper Limits
  48. Konus-Wind observation of GRB 131105A
  49. GRB 131105A: VLT/X-shooter redshift
  50. GRB 131105A: TAROT La Silla observatory optical observations
  51. GRB 131105A: Swift detection of a burst
  52. GRB 131030A: Continued RATIR Optical and NIR Observations
  53. GRB 131103A: Swift/UVOT Detection
  54. GRB 131103A: Swift-XRT refined Analysis
  55. GRB 131103A: Swift detection of a burst
  56. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  57. GRB131031A: RATIR Optical and NIR Observations
  58. GRB 131018B: RATIR Optical/NIR Observations
  59. GRB 131030A: Continued RATIR Optical and NIR Observations
  60. GRB 131031A: Fermi GBM detection
  61. GRB 131031A: Swift/UVOT Upper Limits
  62. LOAO B,R Observation of GRB131030A
  63. GRB 131018B: Further Swift-XRT observations.
  64. GRB 131030A - RoboPol optical afterglow polarimetry
  65. GRB 131031A: MASTER optical observation
  66. GRB 131030A: Bassano Bresciano Observatory optical observations
  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: Swift-XRT refined Analysis
  74. GRB 131030A: Swift/UVOT Detection
  75. Konus-Wind observation of GRB 131030A
  76. GRB 131030A: SAO RAS optical observations
  77. GRB 131030A: D50+BART detection and light curve optical decay
  78. GRB 131029A: Nanshan optical observations
  79. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  80. GRB 131030A: Swift detection of a burst with an optical counterpart
  81. GRB 131029A: Fermi GBM observation
  82. GRB 131029A: Fermi-LAT detection of a burst
  83. IPN Triangulation of GRB 131028A (long/bright)
  84. GRB 131028A: Fermi GBM detection
  85. Swift 575905/GRB 131026A: optical observations
  86. Swift-BAT Trigger 575905 is probably not a real source
  87. GRB 131024B: Mondy optical upper limits
  88. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  89. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  90. Swift Trigger 575905: ROTSE-III Optical Limits
  91. Swift Trigger 575905: KAIT Optical Upper Limit
  92. GRB 131026A: TAROT La Silla observatory optical observations
  93. Swift Trigger 575905: a possible GRB
  94. GRB 131024B, Swift-BAT refined analysis
  95. GRB 131024B: Fermi GBM observation
  96. GRB 131024B: RATIR Optical and NIR Observations
  97. GRB 131024B: Swift/UVOT Upper Limits
  98. GRB 131024B: Swift-XRT refined Analysis
  99. Fermi GBM trigger 13121024.436 is not a GRB
  100. GRB 131024B: Nanshan optical upper limit

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