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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"

16273 results found.

  1. GRB 140808A / PTFeag: VLA K-band observations
  2. GRB 140814A: MASTER optical follow-up inspection
  3. GRB 140808A / iPTF14eag optical follow-up at HCT
  4. GRB 140808A: Confirmation of the Swift-XRT afterglow
  5. GRB140809A: Fermi GBM observation
  6. GRB 140809A : Virtual Telescope optical observations
  7. GRB 140808A: Swift/UVOT Upper Limits
  8. GRB 140808A: Redshift from the 10.4m GTC telescope
  9. GRB 140808A: Swift-XRT observations
  10. GRB 140808A: optical afterglow candidate iPTF14eag
  11. GRB 140801A: AAO optical observations
  12. GRB 140801A: GROND Afterglow detection, unbroken decay
  13. GRB 140801A: BTA confirmation of redshift
  14. GRB 140801A: Swift/UVOT Upper Limits
  15. GRB 140801A: Swift-XRT observations
  16. GRB 140801A : Virtual Telescope optical observations
  17. GRB 140801A: Fermi GBM observation
  18. GRB 140801A: NOT afterglow confirmation
  19. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  20. GRB 140801A: archival upper limits on the host galaxy
  21. GRB 140709B: TShAO optical upper limit
  22. GRB 140730A: Swift/UVOT Upper Limits
  23. GRB 140729A: iPTF optical upper limit
  24. GRB 140723A: LCO-Sutherland optical candidate retraction
  25. GRB 140723A: MASTER optical observation
  26. GRB 140723A: LCO-Sutherland optical candidate
  27. GRB 140709B: Swift/UVOT Upper Limits
  28. GRB 140719A: Swift/UVOT Upper Limits
  29. GRB 140716A: GROND confirmation of the afterglow
  30. GRB 140719B: Zadko observatory - Gingin optical observations
  31. GRB 140716A: Swift/UVOT Upper Limits
  32. GRB 140713A: 10.4-m GTC deep optical observation
  33. GRB 140713A: Swift/UVOT Upper Limits
  34. GRB 140713A: NOT upper limits
  35. GRB 140713A : Xinglong TNT upper limit
  36. GRB 140713A: T100 observations
  37. GRB 140710A: iTelescope.Net T11 Optical Observation
  38. GRB 140709A: Continued RATIR Optical and NIR Observations
  39. GRB 140710A: Swift/UVOT Upper Limits
  40. GRB 140709B: update of Khureltogot optical upper limit
  41. GRB 140710A: RATIR Optical and NIR Observations
  42. GRB 140710A: P60 Confirmation of Afterglow
  43. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  44. GRB 140709A: 10.4m GTC optical decay
  45. GRB 140709A : Virtual Telescope optical observations
  46. GRB 140709B: Khureltogot optical upper limit
  47. GRB 140709B: OSN optical limit
  48. GRB 140709A: BOOTES-2 and OSN optical observations
  49. GRB 140709B: MASTER optical observation
  50. GRB 140709A: Swift/UVOT Upper Limits
  51. GRB 140709A: RATIR Optical and NIR Observations
  52. GRB 140703A: Swift/UVOT Upper Limits
  53. GRB 140703A: AAO optical observations
  54. GRB140706A: GROND detection of the Optical/NIR afterglow
  55. GRB 140706A: Swift detection of a burst with an optical counterpart
  56. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  57. GRB 140705A: KAIT Optical Upper Limit
  58. GRB 140705A: MITSuME Ishigakijima upper limits
  59. GRB 140705A: MITSuME Okayama upper limits
  60. GRB 140705A: Swift/UVOT Upper Limits
  61. GRB 140629A, Optical observations
  62. GRB 140703A: VLA K-band detection
  63. GRB 140703A: CARMA 3mm detection
  64. GRB 140703A: RATIR Optical and NIR Observations
  65. GRB 140703A: Monte Agliale Observatory optical observations
  66. Correction to GCN 16507: GRB 140703A!
  67. GRB 140703A: MASTER optical observations
  68. GRB140703A: 10.4m GTC redshift
  69. GRB 140703A: BOOTES-2 and OSN optical observations
  70. GRB 140629A: MITSuME Akeno Optical observation
  71. GRB 140629A: MASTER-Net preliminary light curve
  72. GRB 140629A: SAO RAS monitoring
  73. Fermi 425667201: optical counterpart search
  74. GRB 140629A: TNG redshift confirmation
  75. GRB140629A: VATT optical observations
  76. GRB 140629A: P60 observations
  77. GRB 140629A: BTA redshift
  78. GRB 140629A: MITSuME Ishigakijima Optical Observation
  79. GRB140629A: Kanata/HOWPol optical observation
  80. GRB 140629A: NOT optical observations
  81. GRB 140629A : Virtual Telescope optical observations
  82. GRB 140629A: RTT150 optical observations
  83. GRB 140629A : Xinglong TNT optical observation
  84. GRB 140629A: MASTER OT detection
  85. GRB 140629A: Swift detection of a burst with an optical counterpart
  86. GRB 140628A: Zadko observatory - Gingin optical observations
  87. GRB 140626A: TAROT La Silla observatory optical observations
  88. GRB 140622A: TAROT La Silla observatory optical observations
  89. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  90. GRB 140626A: Swift/UVOT Upper Limits
  91. GRB140606B/iPTF14bfu: Keck detection of an associated supernova
  92. GRB 140620A / iPTF14cva: TShAO optical observations
  93. GRB 140623A: Swift-XRT and UVOT observations
  94. GRB 140622A: iTelescope.Net T11 Optical Observation
  95. GRB 140622A: Swift/UVOT Upper Limits
  96. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  97. GRB 140622A: KAIT Optical Upper Limit
  98. GRB 140620A / iPTF14cva: Konkoly optical observations
  99. GRB 140622A: RATIR Optical and NIR Observations
  100. GRB 140620A: Swift/UVOT Detection

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