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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"

19593 results found.

  1. GRB 151006A: Swift detection of a burst
  2. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  3. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  4. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  5. Swift Trigger 657564: XRT prompt analysis
  6. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  7. GRB 151001A: RATIR Observations
  8. GRB 151001B: Swift/UVOT Upper Limits
  9. GRB 151001B: Swift-XRT refined Analysis
  10. GRB 151001A: Swift/UVOT Detection
  11. GRB 151001A: NOT imaging
  12. GRB 151001B: Enhanced Swift-XRT position
  13. GRB 151001A: Enhanced Swift-XRT position
  14. GRB 151001B: Swift detection of a burst
  15. GRB 151001A: Swift detection of a burst with an optical counterpart
  16. LIGO/Virgo G184098: spectral classification of PS15cci
  17. GRB 150925A: Swift/UVOT Upper Limits
  18. GRB 150925A: Enhanced Swift-XRT position
  19. GRB 150925A: Swift detection of a burst
  20. LIGO/Virgo G184098: LOFAR follow-up
  21. LIGO/Virgo G184098: ASKAP followup
  22. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  23. LIGO/Virgo G184098: optical transient search with Kiso Schmidt telescope and KWFC on behalf of J-GEM collaboration
  24. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  25. ANTARES neutrino detection: Fermi GBM Observations
  26. LIGO/Virgo G184098: DESGW followup program
  27. LIGO/Virgo G184098: TAROT network optical observations
  28. LIGO/Virgo G184098: Swift follow-up observations
  29. LIGO/Virgo G184098: MWA Followup
  30. LIGO/Virgo G184098: DESGW followup program
  31. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  32. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  33. LIGO/Virgo G184098: Observations from the TOROS collaboration
  34. LIGO/Virgo G184098: observations by MASTER
  35. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  36. LIGO/Virgo G184098: Swift follow-up observations
  37. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  38. GRB 150915A: Swift-XRT refined Analysis
  39. GRB 150910A: AAO optical observations
  40. GRB150915A : IRSF NIR upper limits
  41. GRB 150915A: NOT observations of a brightening afterglow
  42. GRB 150915A: Swift UVOT upper limits
  43. GRB 150910A: Mt. Terskol observatory optical observations
  44. GRB 150910A: TSHAO optical observations
  45. GRB 150915A: GROND detection of an optical counterpart candidate
  46. GRB 150915A: Swift detection of a burst
  47. GRB 150910A: T100 observations
  48. GRB 150911A: GROND Upper Limits
  49. GRB 150910A: Continued RATIR Observations
  50. GRB 150907A: Swift-XRT afterglow detection
  51. GRB 150912A: Swift-XRT and UVOT observations
  52. GRB 150911A: Chuguev observatory upper limit
  53. GRB 150911A: Mt. Terskol observatory upper limit
  54. GRB 150911A: Khureltogot upper limit
  55. GRB 150910A: Mt. Terskol observatory optical observation
  56. GRB 150912A: MITSuME Ishigakijima upper limits
  57. GRB 150910A: RATIR Observations
  58. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  59. GRB 150912A: Swift ToO observations
  60. GRB 150911A: Swift/UVOT Upper Limits
  61. GRB 150910A: AAO optical observations
  62. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  63. GRB 150910A: Chuguev observatory optical observations
  64. GRB 150911A: MITSuME Okayama upper limits
  65. GRB 150910A: continued SAO RAS optical observations
  66. GRB 150911A: Enhanced Swift-XRT position
  67. GRB150911A MITSuME Okayama Ks-band upper-limit
  68. GRB 150910A: TSHAO optical observations
  69. GRB 150911A: Swift detection of a burst
  70. GRB 150910A: NOT observations of the afterglow
  71. GRB 150910A: MITSuME Okayama Ks-band Observation
  72. GRB 150910A: GROND observation of the afterglow
  73. GRB 150910A: MITSuME Ishigakijima Optical Observation
  74. GRB 150910A: SAO RAS optical photometry
  75. GRB 150910A: Enhanced Swift-XRT position
  76. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  77. GRB 150910A: Nanshan optical observations
  78. GRB 150910A: MITSuME Okayama Optical Observation
  79. GRB 150910A: Swift detection of a burst with an optical afterglow
  80. Fermi GBM trigger 463422723/150908689 is not a GRB
  81. IPN Triangulation of GRB 150906B (short/intense)
  82. GRB150907A: Swift/UVOT observations
  83. GRB 150907B: Enhanced Swift-XRT position
  84. GRB 150907B: GROND Upper Limits
  85. GRB 150907B: Swift-XRT observations
  86. GRB 150907A: Tiled Swift observations
  87. GRB 150906A: Fermi GBM detection
  88. GRB 150818A: TSHAO and SAO RAS optical observations
  89. GRB 150902A: Swift-XRT afterglow detection
  90. ANTARES neutrino detection: ANU 2.3m and Kepler K2 Observations of the Swift x-ray source
  91. GRB 150902A: Swift/UVOT Upper Limits
  92. GRB 150831A: 9.8 GHz VLA upper limits
  93. GRB 150902A: Swift ToO observations
  94. GRB 150831B: Swift/UVOT Upper Limits
  95. GRB 150831B: Swift-BAT refined analysis
  96. GRB 150831A: GROND Upper Limits
  97. GRB 150831A: Swift/UVOT Upper Limits
  98. GRB 150831B: Swift-XRT observations
  99. GRB 150831A: Swift-XRT refined Analysis
  100. GRB 150831A: Swift-BAT refined analysis

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