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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"

43898 results found.

  1. GRB 161214B: Swift/UVOT Afterglow Confirmation
  2. IceCube-161210: Kanata/HONIR near-infrared follow-up observation
  3. GRB 161214B: RATIR Optical and Near-Infrared Observations
  4. GRB 161214B: Swift-XRT refined Analysis
  5. GRB 161214B: Enhanced Swift-XRT position
  6. GRB 161214B: TAROT Calern observatory optical observations
  7. GRB 161214B: Chante-perdrix observatory optical observations
  8. GRB 161214B: Swift/UVOT Observations
  9. GRB 161214B: NOT optical observations, possible counterpart
  10. GRB 161214B: Prompt enhanced Swift-XRT position
  11. GRB 161214A: NOT observations of the afterglow
  12. GRB 161214B: Swift detection of a burst
  13. IceCube-161210: Konus-Wind upper limits
  14. GRB 161214A: GROND afterglow observations
  15. GRB 161214A: TAROT Calern observatory optical observations
  16. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  17. GRB 161214A: fading optical afterglow candidate with the LT
  18. GRB 161214A: A long GRB detected by INTEGRAL
  19. HAWC follow-up on IceCube-161210
  20. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  21. IceCube-161210: MAXI/GSC non-detection
  22. IceCube-161210: IceCube observation of a high-energy neutrino candidate event
  23. GRB 161207A: CALET Gamma-Ray Burst Monitor detection
  24. GRB 161129A: GTC redshift of the likely host galaxy
  25. GRB 161129A: NOT optical observations and candidate host galaxy
  26. GRB 161203A: POLAR Detection
  27. GRB 161129A: KWFC z-band photometry
  28. GRB 161203A: Astrosat CZTI (Veto) detection
  29. GRB 161203A: CALET Gamma-Ray Burst Monitor detection
  30. GRB 161206A: Fermi GBM detection
  31. Konus-Wind observation of GRB 161202A
  32. MASTER: Optical Blazar Flare Detection during Fermi trigger 502272781 inspection
  33. GRB 161129A: POLAR Detection
  34. GRB 161202A: Astrosat CZTI detection
  35. GRB 161202A: RATIR Optical and NIR Observations
  36. GRB 161202A: Swift-BAT refined analysis
  37. GRB 161202A: Swift-XRT refined Analysis
  38. GRB 161202A: Fermi-LAT detection
  39. GRB 161202A: Enhanced Swift-XRT position
  40. GRB 161202A: Swift detection of a burst
  41. GRB 161129A: Mondy optical observations
  42. Fermi GBM trigger 502258294/161201175 is not a GRB
  43. GRB 161129A: ISON/UAFO optical observations
  44. GRB 161129A: MITSuME Okayama Ks-band Observation
  45. GRB 160821B: HST detection of the optical and IR counterpart
  46. Fermi Gamma-ray Burst Monitor trigger 161130183 is not a GRB
  47. GRB 161129A: Swift-BAT refined analysis
  48. GRB 161129A: Fermi GBM Detection
  49. GRB 161129A: Swift/UVOT Detection
  50. GRB 161129A: Tautenburg Ic-band observations
  51. GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy
  52. GRB161129A : Astrosat CZTI detection
  53. GRB 161129A: Swift-XRT refined Analysis
  54. GRB 161129A: Enhanced Swift-XRT position
  55. GRB 161129A: Swift detection of a burst
  56. Fermi GBM trigger 501785179/161125699 is not a GRB
  57. Fermi GBM trigger 501779084/161125628 is not a GRB
  58. GRB 161123A: Swift-XRT observations
  59. Swift Trigger 723539 is not an astrophysical event
  60. GRB 161123A: Tiled Swift observations
  61. GRB 161123A: MAXI/GSC detection
  62. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  63. GRB 161108A: 15 GHz upper limits from AMI
  64. Swift Trigger 723124 is probably not a GRB
  65. GRB 161117B: Swift-XRT refined Analysis
  66. Konus-Wind observation of GRB 161117A
  67. GRB 161117A iTelescope observation
  68. GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
  69. GRB 161117A: TAROT La Silla observatory optical observations
  70. GRB 161117A: GMG observation limit
  71. GRB 161117A: Fermi GBM detection/observation
  72. GRB 161117A: Swift/UVOT Detection
  73. GRB 161117B: Swift-BAT refined analysis
  74. GRB 161117A: Swift-BAT refined analysis
  75. Swift Trigger 722681 is probably not a GRB
  76. GRB 161117B: Enhanced Swift-XRT position
  77. GRB 161117A: Swift-XRT refined Analysis
  78. GRB 161117A: Enhanced Swift-XRT position
  79. GRB 161117B: LCO optical observations
  80. GRB 161117B: Swift detection of a burst
  81. GRB161117A: REM optical and NIR afterglow detection
  82. GRB 161117A: VLT/X-shooter spectroscopy and redshift
  83. GRB 161117A: Swift detection of a burst with an optical counterpart
  84. GRB 161113A: Swift-BAT refined analysis
  85. GRB 161113A: Swift/UVOT Upper Limits
  86. GRB 161113A: Swift-XRT refined Analysis
  87. GRB 161113A: Kuban State University optical upper limit
  88. GRB 161113A: Enhanced Swift-XRT position
  89. GRB 161113A: RATIR Optical and NIR Observations
  90. GRB 161113A: Swift detection of a burst
  91. GRB 161109A: CALET Gamma-Ray Burst Monitor detection
  92. GRB 161109A: Swift/UVOT Upper Limits
  93. GRB 161104A: Magellan imaging and spectroscopy
  94. GRB 161108A: continued TSHAO optical observations
  95. GRB 161104A: Chandra X-ray observations
  96. GRB 161109A: Swift-XRT observations
  97. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  98. GRB 161106A: CALET Gamma-Ray Burst Monitor detection
  99. GRB 161108A: TSHAO optical observations
  100. GRB 161108A: Swift/UVOT Upper Limits

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