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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"

28235 results found.

  1. GRB 151022A: Enhanced Swift-XRT position
  2. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  3. GRB 151022A: Mondy optical upper limit
  4. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  5. GRB 151022A: Swift detection of a burst
  6. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  7. GRB 151021B: Fermi GBM detection
  8. GRB 151021A: Swift/UVOT Detection
  9. GRB 151021A: MITSuME Okayama upper limits
  10. GRB 151021A: Swift-XRT refined Analysis
  11. GRB 151021A: Swift-BAT refined analysis
  12. GRB 151021A: Enhanced Swift-XRT position
  13. GRB 151021A: MASTER-NET bright OT detection
  14. GRB 151021A: Optical counterpart and redshift from X-shooter
  15. GRB 151021A: Swift detection of a burst
  16. LIGO/Virgo G184098: LOFAR follow-up
  17. GRB 151004A: Swift-XRT follow-up observations
  18. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  19. GRB 151006A: Mondy optical upper limit
  20. GRB 151006A: OSN optical upper limit
  21. GRB 151006A: Swift-BAT refined analysis
  22. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  23. GRB 151006A: Swift-XRT refined Analysis
  24. GRB 151006A: Fermi-LAT detection
  25. GRB 151006A: Swift/UVOT Upper Limits
  26. GRB 151006A: Fermi GBM detection
  27. GRB 151006A: Enhanced Swift-XRT position
  28. GRB 151006A: MITSuME Okayama upper limits
  29. Konus-Wind observation of GRB 151001B
  30. GRB 151006A: Swift detection of a burst
  31. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  32. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  33. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  34. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  35. Swift Trigger 657564: XRT prompt analysis
  36. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  37. GRB 151001A: Swift-BAT refined analysis
  38. GRB 151001A: RATIR Observations
  39. GRB 151001B: Swift/UVOT Upper Limits
  40. GRB 151001B: Swift-XRT refined Analysis
  41. GRB 151001B: Swift-BAT refined analysis
  42. GRB 151001A: Swift/UVOT Detection
  43. GRB 151001A: NOT imaging
  44. GRB 151001A: Swift-XRT refined Analysis
  45. GRB 151001B: Enhanced Swift-XRT position
  46. GRB 151001A: Enhanced Swift-XRT position
  47. GRB 151001A: Fermi GBM detection
  48. GRB 151001B: Swift detection of a burst
  49. GRB 151001A: Swift detection of a burst with an optical counterpart
  50. LIGO/Virgo G184098: spectral classification of PS15cci
  51. GRB 150925A: Swift/UVOT Upper Limits
  52. GRB 150925A: Swift-BAT refined analysis
  53. GRB 150925A: Swift-XRT refined Analysis
  54. GRB 150925A: Enhanced Swift-XRT position
  55. GRB 150925A: Swift detection of a burst
  56. LIGO/Virgo G184098: LOFAR follow-up
  57. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  58. LIGO/Virgo G184098: optical transient search with Kiso Schmidt telescope and KWFC on behalf of J-GEM collaboration
  59. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  60. LIGO/Virgo G184098: DESGW followup program
  61. LIGO/Virgo G184098: TAROT network optical observations
  62. LIGO/Virgo G184098: Swift follow-up observations
  63. LIGO/Virgo G184098: MWA Followup
  64. LIGO/Virgo G184098: DESGW followup program
  65. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  66. LIGO/Virgo observing run 1 (O1) starts 2015-09-18 15:00 UTC
  67. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  68. LIGO/Virgo G184098: Observations from the TOROS collaboration
  69. LIGO/Virgo G184098: VST-ESO PARANAL observations
  70. LIGO/Virgo G184098: observations by MASTER
  71. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  72. LIGO/Virgo G184098: Swift follow-up observations
  73. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  74. GRB 150915A: Swift-XRT refined Analysis
  75. GRB 150915A, Swift-BAT refined analysis
  76. GRB 150910A: AAO optical observations
  77. Konus-Wind observation of GRB 150911A
  78. GRB150915A : IRSF NIR upper limits
  79. GRB 150915A: NOT observations of a brightening afterglow
  80. GRB 150915A: Swift UVOT upper limits
  81. GRB 150906B: Further analysis of the Konus-Wind data
  82. GRB 150910A: Mt. Terskol observatory optical observations
  83. GRB 150910A: TSHAO optical observations
  84. GRB 150915A: GROND detection of an optical counterpart candidate
  85. GRB 150915A: Swift detection of a burst
  86. GRB 150910A: T100 observations
  87. GRB 150911A: GROND Upper Limits
  88. GRB 150910A: Continued RATIR Observations
  89. GRB 150907A: Swift-XRT afterglow detection
  90. GRB 150912A: Swift-XRT and UVOT observations
  91. GRB 150911A: Chuguev observatory upper limit
  92. GRB 150911A: Mt. Terskol observatory upper limit
  93. GRB 150911A: Khureltogot upper limit
  94. GRB 150910A: Mt. Terskol observatory optical observation
  95. GRB 150912A: MITSuME Ishigakijima upper limits
  96. GRB 150911A: WHT optical imaging
  97. GRB 150910A: RATIR Observations
  98. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  99. GRB 150912A: Fermi GBM observation
  100. GRB 150906B: theoretical estimation of redshift and isotropic energy

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