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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"

19685 results found.

  1. GRB140801A: Swift/XRT further observations
  2. GRB 140730A: GROND Upper limits
  3. GRB 140801A: BTA confirmation of redshift
  4. GRB 140801A: Swift/UVOT Upper Limits
  5. GRB 140801A: Swift-XRT observations
  6. GRB 140801A : Virtual Telescope optical observations
  7. GRB 140801A: NOT afterglow confirmation
  8. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  9. GRB 140709B: TShAO optical upper limit
  10. Swift Trigger 607945: possible noise event in the direction of NGC2559
  11. GRB 140730A: Swift/UVOT Upper Limits
  12. GRB 140730A: Enhanced Swift-XRT position
  13. GRB 140730A: Swift detection of a burst
  14. Swift Trigger 607506 is probably noise
  15. GRB 140729A: Swift-XRT and UVOT observations
  16. IPN Triangulation of GRB 140729A
  17. Trigger 607399: Swift detection of SGR1806-20
  18. GRB 140723A: Swift-XRT and UVOT observations
  19. GRB 140709B: Swift/UVOT Upper Limits
  20. GRB 140719A: Swift/UVOT Upper Limits
  21. GRB 140716A: GROND confirmation of the afterglow
  22. GRB 140719A: GROND Afterglow candidate
  23. GRB 140719B: Zadko observatory - Gingin optical observations
  24. GRB 140719A: Swift-XRT refined Analysis
  25. GRB 140719A: Enhanced Swift-XRT position
  26. GRB 140719A: Swift detection of a burst
  27. GRB 140716A: Swift/UVOT Upper Limits
  28. GRB 140713A: 10.4-m GTC deep optical observation
  29. GRB 140716A: GROND afterglow candidate
  30. GRB 140716A BAT refined analysis
  31. Swift observations of a flare from UX Ari
  32. Swift detection of UX Ari
  33. GRB 140713A: Swift/UVOT Upper Limits
  34. GRB 140713A: NOT upper limits
  35. GRB 140713A: Enhanced Swift-XRT position
  36. GRB 140713A: T100 observations
  37. GRB 140710A: iTelescope.Net T11 Optical Observation
  38. GRB 140713A: Swift detection of a burst
  39. Swift Trigger 604111 is not a GRB
  40. Fermi GBM Observations of SGR 1935+2154
  41. GRB 140709A: Continued RATIR Optical and NIR Observations
  42. GRB 140710A: Swift-XRT refined Analysis
  43. GRB 140710A: Swift/UVOT Upper Limits
  44. GRB 140709B: update of Khureltogot optical upper limit
  45. GRB 140710A: Enhanced Swift-XRT position
  46. GRB 140710A: RATIR Optical and NIR Observations
  47. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  48. GRB 140709A: 10.4m GTC optical decay
  49. GRB 140710A: Swift detection of a burst
  50. GRB 140709B: Khureltogot optical upper limit
  51. GRB 140709B: Enhanced Swift-XRT position
  52. GRB 140709A, Swift-BAT refined analysis
  53. GRB 140709B: Swift detection of a burst
  54. GRB 140709A: Swift/UVOT Upper Limits
  55. GRB 140709A - UVOT-enhanced XRT position
  56. GRB 140709A: RATIR Optical and NIR Observations
  57. GRB 140709A: Swift detection of a burst
  58. Fermi GBM trigger 140708682 is not a GRB
  59. GRB 140705A: Nishi-Harima NIR upper limits
  60. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  61. GRB 140706A: Swift/UVOT Detection
  62. GRB 140703A: Swift/UVOT Upper Limits
  63. GRB140706A: GROND detection of the Optical/NIR afterglow
  64. GRB 140706A: Enhanced Swift-XRT position
  65. GRB 140706A: Swift detection of a burst with an optical counterpart
  66. SGR 1935+2154: Swift-BAT observations of additional short soft events
  67. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  68. GRB 140705A: MITSuME Ishigakijima upper limits
  69. GRB 140705A: MITSuME Okayama upper limits
  70. GRB 140705A: Swift/UVOT Upper Limits
  71. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  72. GRB 140705A: Enhanced Swift-XRT position
  73. GRB 140705A: Swift detection of a short burst
  74. GRB 140629A: SAO RAS Rc band photometry
  75. GRB 140629A, Optical observations
  76. GRB 140703A: RATIR Optical and NIR Observations
  77. GRB 140703A: Monte Agliale Observatory optical observations
  78. GRB 140703A: Enhanced Swift-XRT position
  79. GRB 140703A: BOOTES-2 and OSN optical observations
  80. GRB 140703A: Swift detection of a burst
  81. GRB 140629A: MITSuME Akeno Optical observation
  82. GRB 140629A: SAO RAS monitoring
  83. GRB 140629A: Nishi-Harima NIR Observations
  84. GRB 140629A: Swift/UVOT Detection
  85. GRB140629A: VATT optical observations
  86. GRB 140629A: P60 observations
  87. GRB 140629A: MITSuME Ishigakijima Optical Observation
  88. GRB 140629A: T100 observations
  89. GRB 140629A: NOT optical observations
  90. GRB 140629A: KWFC z-band photometry
  91. GRB 140629A: RTT150 optical observations
  92. GRB 140629A: Swift-BAT refined analysis
  93. GRB 140629A: Enhanced Swift-XRT position
  94. GRB 140629A: Swift detection of a burst with an optical counterpart
  95. GRB 140628A: GROND observation of the afterglow
  96. GRB 140628A: Swift-XRT refined Analysis
  97. GRB 140628A: Zadko observatory - Gingin optical observations
  98. GRB 140628A: Swift/UVOT Detection
  99. GRB 140628A: Swift/UVOT Detection
  100. GRB 140628A: Swift-XRT afterglow detection and enhanced position

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