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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"

37691 results found.

  1. Fermi GBM trigger 501779084/161125628 is not a GRB
  2. GRB 161123A: Swift-XRT observations
  3. GRB 161123A: Tiled Swift observations
  4. GRB 161123A: MAXI/GSC detection
  5. GRB 161117A: SMARTS optical/IR afterglow observations
  6. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  7. GRB 161108A: 15 GHz upper limits from AMI
  8. Swift Trigger 723124 is probably not a GRB
  9. GRB 161117B: Swift-XRT refined Analysis
  10. Konus-Wind observation of GRB 161117A
  11. GRB 161117A iTelescope observation
  12. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  13. GRB 161117A: TAROT La Silla observatory optical observations
  14. GRB 161117A: GMG observation limit
  15. GRB 161117A: Fermi GBM detection/observation
  16. GRB 161117B: Swift/UVOT Upper Limits
  17. GRB 161117A: Swift/UVOT Detection
  18. GRB 161117B: Swift-BAT refined analysis
  19. GRB 161117A: Swift-BAT refined analysis
  20. Swift Trigger 722681 is probably not a GRB
  21. GRB 161117B: Enhanced Swift-XRT position
  22. GRB 161117A: Swift-XRT refined Analysis
  23. GRB 161117A: Enhanced Swift-XRT position
  24. GRB 161117B: LCO optical observations
  25. GRB 161117B: Swift detection of a burst
  26. GRB161117A: REM optical and NIR afterglow detection
  27. GRB 161117A: VLT/X-shooter spectroscopy and redshift
  28. GRB 161117A: Swift detection of a burst with an optical counterpart
  29. GRB 161113A: Swift-BAT refined analysis
  30. GRB 161113A: Swift/UVOT Upper Limits
  31. GRB 161113A: Swift-XRT refined Analysis
  32. GRB 161113A: Kuban State University optical upper limit
  33. GRB 161113A: Enhanced Swift-XRT position
  34. GRB 161113A: RATIR Optical and NIR Observations
  35. GRB 161113A: Swift detection of a burst
  36. GRB 161109A: CALET Gamma-Ray Burst Monitor detection
  37. GRB 161109A: Swift/UVOT Upper Limits
  38. GRB 161104A: Magellan imaging and spectroscopy
  39. GRB 161108A: continued TSHAO optical observations
  40. GRB 161104A: Chandra X-ray observations
  41. GRB 161109A: Lomonosov BDRG gamma ray discovery
  42. GRB 161109A: Swift-XRT observations
  43. GRB 161108A: MITSuME Okayama upper limits
  44. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  45. GRB 161108A: TSHAO optical observations
  46. GRB 161108A: Swift/UVOT Upper Limits
  47. GRB 161109A: Tiled Swift observations
  48. GRB 161105A: Swift/UVOT Upper Limits
  49. GRB 161109A: Fermi GBM observation
  50. GRB 161109A: Fermi-LAT detection
  51. GRB 161106A: Lomonosov BDRG gamma ray discovery
  52. GRB 161108A: TAROT Calern observatory optical observations
  53. GRB 161105A: TAROT La Silla observatory optical observations
  54. GRB 161108A, Swift-BAT refined analysis
  55. GRB 161108A: NOT redshift
  56. GRB 161108A: RATIR Afterglow Confirmation
  57. GRB 161108A: Swift-XRT refined Analysis
  58. GRB 161108A: Enhanced Swift-XRT position
  59. GRB 161108A: NOT candidate afterglow
  60. GRB 161108A: Swift detection of a burst
  61. Fermi LAT Gamma-ray Observations of IceCube-161103
  62. GRB 161022A: 15 GHz upper limits from AMI
  63. GRB 161017A: 15 GHz upper limits from AMI
  64. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  65. GRB 161106A: Fermi GBM detection
  66. IceCube-161103: Konus-Wind upper limits
  67. GRB 161105A: Swift-XRT refined Analysis
  68. GRB 161104A: Gemini South optical observations
  69. GRB 161105A: Swift-BAT refined analysis
  70. GRB 161105A: Enhanced Swift-XRT position
  71. GRB 161105A: MASTER-IAC early optical observations
  72. GRB 161104A: GROND observations
  73. GRB 161105A: Swift detection of a burst
  74. GRB 161104A: Swift/UVOT Upper Limits
  75. GRB 161104A, Swift-BAT refined analysis
  76. GRB 161104A: Swift-XRT refined Analysis
  77. Fermi GBM Observations of IceCube-161103
  78. GRB 160928A: The first GRB detected by POLAR
  79. GRB 161104A: Enhanced Swift-XRT position
  80. GRB 161104A: Swift detection of a short burst
  81. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  82. GRB 161020A: Fermi GBM observation
  83. Fermi GBM trigger 499467682/161029876 is not a GRB
  84. GRB 161015A: 15 GHz upper limits from AMI
  85. GRB 161014A: 15 GHz upper limits from AMI
  86. GRB161023A: AstroSat CZTI detection
  87. GRB 161023A: GROND Observations
  88. GRB 161023A: Swift-XRT afterglow detection
  89. Konus-Wind observation of GRB 161023A
  90. GRB 161023A: TAROT La Silla observatory optical observations
  91. GRB 161023A: Zadko observatory - Gingin optical observations
  92. GRB 161023A: Watcher optical observations
  93. GRB 161023A: LCOGT-FTS optical observations
  94. GRB 161023A: Swift ToO observations
  95. Radio upper limit on the GRB 161011A with the GMRT
  96. GRB 161023A VLT/X-shooter redshift
  97. GRB 161023A: A long GRB detected by INTEGRAL
  98. GRB 161023A (Integral trigger 7613) MASTER-Net bright OT detection
  99. GRB 161022A: Swift-BAT refined analysis
  100. GRB 161022A: RATIR Optical and NIR Observations

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