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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"

27464 results found.

  1. LIGO/Virgo G194575: INTEGRAL search of temporally coincident prompt hard X-ray emission
  2. LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region
  3. GRB 151022A: Swift-BAT refined analysis
  4. GRB 151023A: Swift detection of a burst
  5. GRB 151022A: RATIR Upper Limits
  6. GRB 151022A: Swift-XRT refined Analysis
  7. LIGO/Virgo G194575: transients from Pan-STARRS in the RA=1hr localisation region
  8. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  9. GRB 151022A: MITSuME Okayama Ks-band upper-limit
  10. GRB 151022A: Kanata/HOWPol optical observation
  11. GRB 151022A: MASTER-Ural observations
  12. GRB 151022A: Swift detection of a burst
  13. GRB 151021A: MITSuME Okayama Ks-band upper-limit
  14. GRB 151021B: Fermi GBM detection
  15. Konus-Wind observation of GRB 151021A
  16. GRB 151021A: Swift/UVOT Detection
  17. GRB 151021A: Swift-XRT refined Analysis
  18. GRB 151021A: Swift-BAT refined analysis
  19. GRB 151021A: MASTER-NET bright OT detection
  20. GRB 151021A: Swift detection of a burst
  21. LIGO/Virgo G184098: LOFAR follow-up
  22. GRB 151004A: Swift-XRT follow-up observations
  23. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  24. Fermi GBM trigger 466602792/151015495 is not a GRB
  25. Fermi GBM trigger 466316973/151012187 is not a GRB
  26. Fermi GBM trigger 466059859/151009211 is not a GRB
  27. Konus-Wind observation of GRB 151006A
  28. Swift Trigger 658045 is not a GRB
  29. GRB 151006A: Swift-BAT refined analysis
  30. GRB 151006A: MITSuME Okayama Ks-band upper-limit
  31. GRB 151006A: Swift-XRT refined Analysis
  32. GRB 151006A: Fermi-LAT detection
  33. GRB 151006A: Swift/UVOT Upper Limits
  34. GRB 151006A: Fermi GBM detection
  35. Konus-Wind observation of GRB 151001B
  36. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  37. GRB 151006A: Swift detection of a burst
  38. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  39. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  40. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  41. Swift Trigger 657564: MASTER-NET early optical observations.
  42. Swift Trigger 657564: XRT prompt analysis
  43. LIGO/Virgo G184098: MASTER OTs detection and Scenario Machine prediction
  44. Swift Trigger 657564: a probable GRB
  45. GRB 151001A: Swift-BAT refined analysis
  46. GRB 151001A: RATIR Observations
  47. GRB 151001B: Swift/UVOT Upper Limits
  48. GRB 151001B: Swift-XRT refined Analysis
  49. GRB 151001B: Swift-BAT refined analysis
  50. GRB 151001A: Swift/UVOT Detection
  51. GRB 151001B: MASTER-NET early optical observations.
  52. GRB 151001A: NOT imaging
  53. GRB 151001A: Swift-XRT refined Analysis
  54. GRB 151001A: Fermi GBM detection
  55. GRB 151001B: Swift detection of a burst
  56. GRB 151001A: Swift detection of a burst with an optical counterpart
  57. LIGO/Virgo G184098: Liverpool Telescope Spectroscopy of PS15ccx
  58. GRB 150925A: Swift/UVOT Upper Limits
  59. GRB 150925A: Swift-BAT refined analysis
  60. GRB 150925A: Swift-XRT refined Analysis
  61. GRB 150925A: Swift detection of a burst
  62. LIGO/Virgo G184098: LOFAR follow-up
  63. LIGO/VIRGO G184098 : classifications of transients from the LSQ observations
  64. GRB 150922A: Fermi GBM observation
  65. IPN Triangulation of GRB 150922A (short/hard)
  66. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  67. Fermi GBM trigger bn150920977 is not due to a GRB
  68. LIGO/Virgo G184098: DESGW followup program
  69. LIGO/Virgo G184098: SkyMapper observations
  70. LIGO/Virgo G184098: TAROT network optical observations
  71. LIGO/Virgo G184098: Swift follow-up observations
  72. LIGO/Virgo G184098: MWA Followup
  73. LIGO/Virgo G184098: DESGW followup program
  74. LIGO/Virgo G184098: Nearby Galaxies in Error Circle
  75. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  76. LIGO/Virgo G184098: iPTF Optical Transient Candidates
  77. LIGO/Virgo G184098: VST-ESO PARANAL observations
  78. LIGO/Virgo G184098: Pan-STARRS1 observations of the northern sky region
  79. LIGO/Virgo G184098: observations by MASTER
  80. LIGO/Virgo G184098: TAROT La Silla Observatory optical observations (TZAC)
  81. LIGO/Virgo G184098: Swift follow-up observations
  82. LIGO/Virgo G184098: Burst candidate in LIGO engineering run data
  83. GRB 150915A: Swift-XRT refined Analysis
  84. GRB 150915A, Swift-BAT refined analysis
  85. Konus-Wind observation of GRB 150911A
  86. GRB 150915A: NOT observations of a brightening afterglow
  87. GRB 150915A: Swift UVOT upper limits
  88. GRB 150915A: VLT/X-shooter redshift
  89. GRB 150915A: GROND detection of an optical counterpart candidate
  90. GRB 150915A: MASTER-NET optical observations
  91. GRB 150915A: Swift detection of a burst
  92. GRB 150910A: T100 observations
  93. GRB 150911A: GROND Upper Limits
  94. GRB 150910A: Continued RATIR Observations
  95. GRB 150912A: Swift-XRT and UVOT observations
  96. GRB 150911A: Khureltogot upper limit
  97. Fermi GBM trigger 463890496/150914103 is not a GRB
  98. GRB 150910A: RATIR Observations
  99. GRB 150912A: MASTER-IAC optical observations
  100. GRB 150912A: Fermi GBM observation

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