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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"

27176 results found.

  1. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  2. GRB 151006A: Swift detection of a burst
  3. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  4. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  5. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  6. Swift Trigger 657564: MASTER-NET early optical observations.
  7. Swift Trigger 657564: XRT prompt analysis
  8. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  9. Swift Trigger 657564: a probable GRB
  10. GRB 151001A: Swift-BAT refined analysis
  11. GRB 151001A: RATIR Observations
  12. GRB 151001B: Swift/UVOT Upper Limits
  13. GRB 151001B: Swift-XRT refined Analysis
  14. GRB 151001B: Swift-BAT refined analysis
  15. GRB 151001A: Swift/UVOT Detection
  16. GRB 151001B: MASTER-NET early optical observations.
  17. GRB 151001A: NOT imaging
  18. GRB 151001A: Swift-XRT refined Analysis
  19. GRB 151001A: Fermi GBM detection
  20. GRB 151001B: Swift detection of a burst
  21. GRB 151001A: Swift detection of a burst with an optical counterpart
  22. LIGO/Virgo G184098: Liverpool Telescope Spectroscopy of PS15ccx
  23. GRB 150925A: Swift/UVOT Upper Limits
  24. GRB 150925A: Swift-BAT refined analysis
  25. GRB 150925A: Swift-XRT refined Analysis
  26. GRB 150925A: Swift detection of a burst
  27. LIGO/Virgo G184098: LOFAR follow-up
  28. LIGO/VIRGO G184098 : classifications of transients from the LSQ observations
  29. GRB 150922A: Fermi GBM observation
  30. IPN Triangulation of GRB 150922A (short/hard)
  31. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  32. Fermi GBM trigger bn150920977 is not due to a GRB
  33. LIGO/Virgo G184098: DESGW followup program
  34. LIGO/Virgo G184098: SkyMapper observations
  35. LIGO/Virgo G184098: TAROT network optical observations
  36. LIGO/Virgo G184098: Swift follow-up observations
  37. LIGO/Virgo G184098: MWA Followup
  38. LIGO/Virgo G184098: DESGW followup program
  39. LIGO/Virgo G184098: Nearby Galaxies in Error Circle
  40. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  41. LIGO/Virgo G184098: iPTF Optical Transient Candidates
  42. LIGO/Virgo G184098: VST-ESO PARANAL observations
  43. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  44. LIGO/Virgo G184098: observations by MASTER
  45. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  46. LIGO/Virgo G184098: Swift follow-up observations
  47. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  48. GRB 150915A: Swift-XRT refined Analysis
  49. GRB 150915A, Swift-BAT refined analysis
  50. Konus-Wind observation of GRB 150911A
  51. GRB 150915A: NOT observations of a brightening afterglow
  52. GRB 150915A: Swift UVOT upper limits
  53. GRB 150915A: VLT/X-shooter redshift
  54. GRB 150915A: GROND detection of an optical counterpart candidate
  55. GRB 150915A: MASTER-NET optical observations
  56. GRB 150915A: Swift detection of a burst
  57. GRB 150910A: T100 observations
  58. GRB 150911A: GROND Upper Limits
  59. GRB 150910A: Continued RATIR Observations
  60. GRB 150912A: Swift-XRT and UVOT observations
  61. GRB 150911A: Khureltogot upper limit
  62. Fermi GBM trigger 463890496/150914103 is not a GRB
  63. GRB 150910A: RATIR Observations
  64. GRB 150912A: MASTER-IAC optical observations
  65. GRB 150912A: Fermi GBM observation
  66. GRB150911A: P60 Observations
  67. GRB 150911A: Swift/UVOT Upper Limits
  68. GRB 150911A: Swift-BAT refined analysis
  69. GRB 150911A: Swift-XRT refined Analysis
  70. GRB150911A MITSuME Okayama Ks-band upper-limit
  71. GRB 150911A: Swift detection of a burst
  72. GRB 150910A: MITSuME Okayama Ks-band Observation
  73. GRB 150910A: GROND observation of the afterglow
  74. GRB 150910A: SAO RAS optical photometry
  75. GRB 150910A: Swift-XRT refined Analysis
  76. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  77. GRB 150910A: Swift-BAT refined analysis
  78. GRB 150910A: LCOGT FTN afterglow observations
  79. GRB 150910A: Swift detection of a burst with an optical afterglow
  80. Swift Trigger 654954 is not an astrophysical event
  81. Fermi GBM trigger 463422723/150908689 is not a GRB
  82. GRB 150907B: Swift-XRT refined Analysis
  83. Fermi GBM trigger 463339482/150907725 is too weak to be classified
  84. GRB 150907B: Swift-BAT refined analysis
  85. GRB150907A: Swift/UVOT observations
  86. GRB 150907B: MASTER-SAAO early optical observations
  87. GRB 150907B: GROND Upper Limits
  88. GRB 150907B: Swift-XRT observations
  89. GRB 150907B: Swift detection of a burst
  90. Fermi GBM trigger 150907763 is not a GRB
  91. GRB 150906A: Fermi GBM detection
  92. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  93. GRB 150902A: Swift/UVOT Upper Limits
  94. GRB 150902A: MASTER-SAAO optical observations
  95. GRB 150901A, Swift-BAT refined analysis
  96. GRB 150902A: Fermi GBM detection
  97. GRB 150902A: Fermi-LAT detection
  98. GRB 150831B: Swift/UVOT Upper Limits
  99. Konus-Wind observation of GRB 150831A
  100. GRB 150901A: Swift detection of a burst

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