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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

16294 results found.

  1. GRB 170205A: RATIR Optical and NIR Observations
  2. GRB 170202A: SMARTS optical/IR afterglow observations
  3. GRB 170205A: LCO FTN observations
  4. GRB 170205A: Swift detection of a burst with an optical counterpart
  5. GRB 170202A: SQUEAN Observation (2nd night)
  6. GRB 170202A: Zadko observatory - Gingin optical observations
  7. GRB 170202A: Etelman Observatory optical observations
  8. GRB 170202A: RATIR Optical and NIR Observations
  9. GRB 170202A: LCO FTN observations
  10. GRB 170202A VLT/X-shooter redshift [minor correction]
  11. GRB 170202A: Xinglong 2.16m photometry and spectroscopic redshift
  12. GRB 170202A: MITSuME Akeno Optical Observation
  13. GRB 170202A: NOT afterglow observations
  14. GRB 170202A: Kanata optical and infrared observations
  15. GRB 170202A: Zadko observatory - Gingin optical observations
  16. GRB 170202A: LCO Sutherland observations
  17. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  18. GRB 170202A : Xinglong TNT optical observation
  19. GRB 170202A: Swift detection of a burst with an optical afterglow
  20. GRB 170131A: Swift/UVOT Upper Limits
  21. LIGO/Virgo G270580: Las Cumbres Observatory Follow-up Observations
  22. GRB 170127B: Swift/UVOT Upper Limits
  23. GRB 170127A: Swift/UVOT Upper Limits
  24. GRB 170127B: NOT r-band upper limits
  25. GRB 170127B: MASTER-Kislovodsk early optical observations
  26. GRB 170126A: Swift detection of a burst with an optical counterpart
  27. LIGO/Virgo G270580: NOT observations of PS17yt
  28. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  29. GRB 170121B: AbAO optical observations
  30. GRB 170121B: MASTER early optical observations of the Swift possible XT
  31. GRB 170121B: Swift-XRT and UVOT observations
  32. GRB 170121B: LCO FTN observations
  33. LIGO/Virgo G270580: A third optical transient from CNEOST
  34. GRB 170121B: Fermi GBM detection
  35. LIGO/Virgo G270580: ATLAS coverage and 4 optical transients
  36. LIGO/Virgo G270580: Two optical counterpart candidates from CNEOST
  37. LIGO/Virgo G270580: Pan-STARRS and ATLAS observations of the skymap
  38. GRB 170117A: Swift/UVOT Upper Limits
  39. GRB 170115A : AbAO optical upper limit
  40. GRB 170115A: Swift/UVOT Upper Limits
  41. GRB 170112A : AbAO optical observations
  42. GRB 170113A: VLT/X-shooter redshift
  43. GRB 170113A: GROND afterglow observations
  44. GRB 170112A: Swift/UVOT Upper Limits
  45. GRB 170113A: LCO Sutherland observations
  46. GRB 170113A: Swift detection of a burst with an optical counterpart
  47. GRB 170112A: RATIR Optical and NIR Observations
  48. GRB 161219B: afterglow and SN2016jca optical observations
  49. GRB 170111A: Swift/UVOT Upper Limits
  50. GRB 170112A: MASTER-OAFA (Argentina) early optical observations
  51. GRB 170112A: REM optical/NIR observations
  52. GRB170111A: REM optical/NIR observations
  53. LIGO/Virgo G268556: Early SWASP limits of ATLAS17aeu
  54. GRB 170111A: SMARTS optical/IR observations
  55. LIGO/Virgo G268556: Additional GROWTH follow up observation of iPTF Optical Transient Candidates
  56. GRB 170111A: MASTER-OAFA (Argentina) prompt OT observations
  57. LIGO/Virgo G268556: AMI 15 GHz detection of ATLAS17aeu
  58. LIGO/Virgo G268556: Lijiang Observatory GMG Telescope Upper Limit on ATLAS17aeu
  59. LIGO/Virgo G268556: NOWT of EWE, Xinglong 0.6/0.9m, Xuyi 1m optical upper limits of ATLAS17aeu and a reminder of GCN 20394
  60. LIGO/Virgo G268556: Swift-XRT confirms that ATLAS17aeu is fading in X-rays
  61. LIGO/Virgo G268556/GW170104: TNG spectroscopic observations of iPTF17ck and iPTF17dz
  62. LIGO/Virgo G268556: IPN Triangulation of GRB 170105A (association with ATLAS17aeu)
  63. LIGO/Virgo G268556: Continued iPTF Observations and Additional Optical Transient Candidates
  64. LIGO/Virgo G268556: Swift/UVOT observations of ATLAS17aeu
  65. LIGO/Virgo G268556: iPTF Optical Transient Candidates
  66. Discovery Channel Telescope Imaging of ATLAS17aeu (LVCG268556)
  67. LIGO/Virgo G268556: VLA follow-up of ATLAS17aeu
  68. LIGO/Virgo G268556: SWASP optical imaging
  69. LIGO/Virgo G268556: Swift-XRT sources
  70. GRB170104.78 MASTER-Net OT detection
  71. GRB 161214B: MASTER-Kislovodsk early optical observations
  72. GRB 161214A: MASTER-IAC early optical observations
  73. GRB 161219B: Spectroscopic detection of the associated SN with OSIRIS/GTC
  74. GRB 161224A: TSHAO optical observations
  75. GRB 161224A: Swift/UVOT Upper limits
  76. GRB 161219B: UKIRT near-IR afterglow detection
  77. GRB161219.78 MASTER-Net OT detection
  78. GRB 161219B: Rapid ALMA Observations & Detection
  79. GRB 161219B: SALT observations
  80. GRB 161219B: VLT/X-shooter redshift
  81. GRB 161214B: optical spectroscopy of the foreground SDSS object
  82. GRB 161219B: MITSuME Akeno Optical Observation
  83. GRB 161219B: VLA Detection
  84. GRB 161220A: GROND Upper Limits
  85. GRB 161219B: ISON/Terskol optical observations
  86. GRB 161220A: Swift/UVOT Upper Limits
  87. GRB 161219B: Watcher optical observations
  88. GRB 161219B: LCO Sutherland observations
  89. GRB 161219B: GROND afterglow observations
  90. GRB 161219B: Swift detection of a burst with an optical afterglow
  91. GRB 161218A: TAROT Calern observatory optical observations
  92. GRB 161217A: TAROT Calern observatory optical observations
  93. GRB 161217A: MITSuME Okayama upper limits
  94. GRB 161217A: Swift/UVOT Upper Limits
  95. GRB 161214B: AbAO and ISON/Terskol optical observations
  96. GRB 161214B: Mondy optical observations
  97. IceCube-161210: Kanata/HONIR near-infrared follow-up observation
  98. GRB 161214B: RATIR Optical and Near-Infrared Observations
  99. GRB 161214B: TAROT Calern observatory optical observations
  100. GRB 161214B: Chante-perdrix observatory optical observations

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