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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"

28119 results found.

  1. GRB 151004A: Swift-XRT follow-up observations
  2. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  3. GRB 151006A: Mondy optical upper limit
  4. GRB 151006A: OSN optical upper limit
  5. GRB 151006A: Swift-BAT refined analysis
  6. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  7. GRB 151006A: Swift-XRT refined Analysis
  8. GRB 151006A: Fermi-LAT detection
  9. GRB 151006A: Swift/UVOT Upper Limits
  10. GRB 151006A: Fermi GBM detection
  11. GRB 151006A: Enhanced Swift-XRT position
  12. GRB 151006A: MITSuME Okayama upper limits
  13. Konus-Wind observation of GRB 151001B
  14. GRB 151006A: Swift detection of a burst
  15. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  16. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  17. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  18. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  19. Swift Trigger 657564: XRT prompt analysis
  20. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  21. GRB 151001A: Swift-BAT refined analysis
  22. GRB 151001A: RATIR Observations
  23. GRB 151001B: Swift/UVOT Upper Limits
  24. GRB 151001B: Swift-XRT refined Analysis
  25. GRB 151001B: Swift-BAT refined analysis
  26. GRB 151001A: Swift/UVOT Detection
  27. GRB 151001A: NOT imaging
  28. GRB 151001A: Swift-XRT refined Analysis
  29. GRB 151001B: Enhanced Swift-XRT position
  30. GRB 151001A: Enhanced Swift-XRT position
  31. GRB 151001A: Fermi GBM detection
  32. GRB 151001B: Swift detection of a burst
  33. GRB 151001A: Swift detection of a burst with an optical counterpart
  34. LIGO/Virgo G184098: spectral classification of PS15cci
  35. GRB 150925A: Swift/UVOT Upper Limits
  36. GRB 150925A: Swift-BAT refined analysis
  37. GRB 150925A: Swift-XRT refined Analysis
  38. GRB 150925A: Enhanced Swift-XRT position
  39. GRB 150925A: Swift detection of a burst
  40. LIGO/Virgo G184098: LOFAR follow-up
  41. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  42. LIGO/Virgo G184098: optical transient search with Kiso Schmidt telescope and KWFC on behalf of J-GEM collaboration
  43. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  44. LIGO/Virgo G184098: DESGW followup program
  45. LIGO/Virgo G184098: TAROT network optical observations
  46. LIGO/Virgo G184098: Swift follow-up observations
  47. LIGO/Virgo G184098: MWA Followup
  48. LIGO/Virgo G184098: DESGW followup program
  49. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  50. LIGO/Virgo observing run 1 (O1) starts 2015-09-18 15:00 UTC
  51. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  52. LIGO/Virgo G184098: Observations from the TOROS collaboration
  53. LIGO/Virgo G184098: VST-ESO PARANAL observations
  54. LIGO/Virgo G184098: observations by MASTER
  55. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  56. LIGO/Virgo G184098: Swift follow-up observations
  57. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  58. GRB 150915A: Swift-XRT refined Analysis
  59. GRB 150915A, Swift-BAT refined analysis
  60. GRB 150910A: AAO optical observations
  61. Konus-Wind observation of GRB 150911A
  62. GRB150915A : IRSF NIR upper limits
  63. GRB 150915A: NOT observations of a brightening afterglow
  64. GRB 150915A: Swift UVOT upper limits
  65. GRB 150906B: Further analysis of the Konus-Wind data
  66. GRB 150910A: Mt. Terskol observatory optical observations
  67. GRB 150910A: TSHAO optical observations
  68. GRB 150915A: GROND detection of an optical counterpart candidate
  69. GRB 150915A: Swift detection of a burst
  70. GRB 150910A: T100 observations
  71. GRB 150911A: GROND Upper Limits
  72. GRB 150910A: Continued RATIR Observations
  73. GRB 150907A: Swift-XRT afterglow detection
  74. GRB 150912A: Swift-XRT and UVOT observations
  75. GRB 150911A: Chuguev observatory upper limit
  76. GRB 150911A: Mt. Terskol observatory upper limit
  77. GRB 150911A: Khureltogot upper limit
  78. GRB 150910A: Mt. Terskol observatory optical observation
  79. GRB 150912A: MITSuME Ishigakijima upper limits
  80. GRB 150911A: WHT optical imaging
  81. GRB 150910A: RATIR Observations
  82. GRB 150910A: MITSuME Ishigakijima Optical Observation after 2 days
  83. GRB 150912A: Fermi GBM observation
  84. GRB 150906B: theoretical estimation of redshift and isotropic energy
  85. GRB 150911A: Swift/UVOT Upper Limits
  86. GRB 150911A: Swift-BAT refined analysis
  87. GRB 150912A: A long GRB detected by INTEGRAL
  88. GRB 150911A: Swift-XRT refined Analysis
  89. GRB 150910A: AAO optical observations
  90. GRB 150910A: MITSuME Ishigakijima Optical Observation after 1 day
  91. GRB 150910A: Chuguev observatory optical observations
  92. GRB 150911A: MITSuME Okayama upper limits
  93. GRB 150910A: continued SAO RAS optical observations
  94. GRB 150911A: Enhanced Swift-XRT position
  95. GRB150911A MITSuME Okayama Ks-band upper-limit
  96. GRB 150910A: TSHAO optical observations
  97. GRB 150911A: Swift detection of a burst
  98. GRB 150910A: NOT observations of the afterglow
  99. GRB 150910A: MITSuME Okayama Ks-band Observation
  100. GRB 150910A: GROND observation of the afterglow

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