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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"

32723 results found.

  1. GRB 091109A: GROND confirmation of redshift z = 3.5
  2. GRB091127: Continuing Swift/UVOT Observations
  3. GRB 091127, SMARTS optical/IR afterglow observations
  4. GRB091202: Swift-XRT refined analysis
  5. GRB 091202: Swift/UVOT Upper Limits
  6. GRB 091202: Liverpool Telescope observations
  7. GRB 091202: Optical and NIR observations
  8. GRB 091127: Zadko Telescope Observations
  9. GRB 091126A: Suzaku WAM observation of the prompt emission
  10. GRB 091202: Liverpool Telescope Observations
  11. GRB 091127: redshift confirmation with X-shooter
  12. GRB 091117: Chandra Observations
  13. GRB 091020: MASTER-Net optical polarization observations
  14. GRB 091127: Skynet/PROMPT Continued Observations of Fading
  15. Short X-ray Transient Detection by MAXI/GSC
  16. Konus-Wind observation of very long GRB 091123
  17. GRB 091130A: Xinglong TNT upper limit
  18. GRB 091127: Suzaku WAM observation of the prompt emission
  19. GRB 091130B: Swift-XRT team refined analysis
  20. GRB 091130B: Swift-BAT refined analysis
  21. GRB 091130B: Swift/UVOT Upper Limits
  22. GRB 091127: Skynet/PROMPT Observations of Fading
  23. GRB 091130B: MASTER observations
  24. GRB 091130B: SDSS galaxy at XRT location
  25. GRB 091130: MASTER observations
  26. GRB 091127: Radio observations
  27. Konus-Wind observation of GRB 091127
  28. GRB 091127: optical observations
  29. GRB 091127: LABOCA/APEX submm observations
  30. GRB 091127: Further NOT optical observations
  31. GRB 091127: Fermi GBM detection
  32. GRB 091127: MASTER early optical transient polarimetry
  33. GRB 091127: Gemini-N redshift
  34. GRB 091127: Swift-XRT afterglow detection and analysis
  35. GRB 091127: Swift/UVOT observations
  36. GRB 091127: CAHA 1.23m I-band observations
  37. GRB 091127: Swift-BAT refined analysis
  38. GRB 091127: NOT observations
  39. GRB 091127 : GROND observations
  40. GRB 091127: REM NIR afterglow detection
  41. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  42. GRB 091127: Liverpool Telescope afterglow candidate
  43. IPN Triangulation of GRB091120
  44. Konus-Wind observation of GRB 091120
  45. GRB 091117A: Suzaku WAM observation of the prompt emission
  46. GRB 091117: TNG optical observations
  47. GRB 091117A: Swift/UVOT followup observations
  48. GRB 091117: 2nd epoch of Magellan optical observations
  49. GRB 091117: VLA radio observations
  50. GRB 091117: Swift-XRT observations
  51. GRB 091117 BAT refined analysis
  52. GRB 091117: Evidence for Variability of XRT Source #1
  53. GRB091117: Gemini South Observations
  54. GRB 091117: Swift XRT refined analysis
  55. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  56. Konus-Wind observations of GRB 091117A
  57. GRB 091117: Magellan optical observations
  58. GRB 091117: XRT source coincident with a DSS galaxy
  59. GRB 091112: Suzaku WAM observation of the prompt emission
  60. GRB 091102A: Suzaku WAM observation of the prompt emission
  61. GRB 091109B: Suzaku WAM observation of the prompt emission
  62. GRB091111: Swift XRT refined analysis
  63. Konus-Wind and Konus-RF observations of GRB 091031
  64. GRB 091112: Swift-BAT refined analysis
  65. GRB 091112: Fermi GBM observation
  66. GRB 091031: Fermi LAT detection of a faint burst
  67. GRB 091111: BOOTES-3 contemporaneous imaging
  68. GRB 091111: a faint long GRB detected with INTEGRAL
  69. GRB 091109A: GROND and VLT observations
  70. GRB 091109B: Swift/UVOT Upper Limits
  71. GRB 091109B: VLT afterglow confirmation
  72. GRB 091109B: Swift-XRT Team refined analysis
  73. GRB 091109b: Magellan Observations
  74. GRB 091109B: Swift-BAT refined analysis
  75. GRB 091109B: Optical limits from Watcher
  76. GRB 091109B: ROTSE-III Optical Limits
  77. GRB091109: Correction to GCN 10139
  78. GRB 091109: Swift-XRT refined analysis
  79. GRB 091109: BOOTES-3 observations
  80. GRB 091109: Swift/UVOT observations
  81. GRB 091109: Faulkes Telescope South observations
  82. GRB 091109: Swift-BAT refined analysis
  83. GRB 091029: Observations from Stardome Observatory
  84. GRB 091104: Swift-BAT refined analysis
  85. GRB 091104: Swift XRT Refined Analysis
  86. GRB 091104: Swift/UVOT Upper Limits
  87. GRB091026 : IRSF NIR upper limit
  88. GRB091102 : MOA optical upper limit
  89. GRB 091102: LABOCA/APEX submm observations
  90. Fermi LAT Upper Limits on GRB 091010
  91. GRB 091102 : Faulkes Telescope South Upper Limits
  92. GRB 091102A: Fermi GBM observation
  93. GRB 091102: Swift-XRT refined analysis
  94. GRB 091102: Swift/UVOT Upper Limits
  95. GRB 091102: GROND Upper Limits
  96. GRB 091102: BOOTES-3 observations
  97. GRB 091102: Swift-BAT refined analysis
  98. GRB 091102: Swift/XRT localization
  99. GRB 091102: ROTSE-III Optical Limits
  100. GRB 091102: Swift/UVOT Finding Chart Observation

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