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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"

16289 results found.

  1. GRB 160117B: NOT optical afterglow observations
  2. GRB 160117B: Swift/UVOT Detection
  3. GRB 160117B: LCOGT-SSO optical observations
  4. GRB 160117B: MASTER-Amur OT observations
  5. GRB 160117B: Swift detection of a burst with optical counterpart
  6. LIGO/Virgo G211117: INAF NOT follow-up of PanStarrs candidates
  7. GRB 160113A: Swift-XRT observations
  8. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  9. GRB 160104A: Swift/UVOT Detection
  10. LIGO/Virgo G211117: iPTF Observations of PS15dpn
  11. GRB 160104A: Continued MITSuME Akeno Optical Observation
  12. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  13. LIGO/Virgo G211117: Further Swift-XRT sources
  14. GRB 160104A: Nishi-Harima MINT Observations
  15. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  16. GRB 160104A: GWAC upper limit during prompt emission phase
  17. GRB 160104A: MITSuME Okayama upper limits
  18. GRB 160104A: Xinglong TNT optical observation
  19. LIGO/Virgo G211117: INAF TNG follow-up of Kanata telescope candidate
  20. GRB 160104A: MASTER early OT detection
  21. GRB 160104A: MITSuME Akeno Optical Observation
  22. GRB 160101A: MITSuME Akeno optical upper limits
  23. GRB 160101A: Swift/UVOT Detection
  24. LIGO/Virgo G211117: INAF TNG follow-up of MASTER OT J020906.21+013800.1
  25. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  26. V404Cyg Swift Trigger 668097: AbAO optical observations
  27. GRB 151229A: MITSuME Akeno optical upper limits
  28. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  29. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  30. GRB 151229A: MITSuME Okayama upper limits
  31. GRB 151228B: MITSuME Akeno optical upper limits
  32. GRB 151229A: Swift/UVOT observations
  33. GRB 151228A: MITSuME Akeno optical upper limits
  34. GRB 151228A: T60 observations
  35. LIGO/Virgo G211117: DESGW program observations with DECam
  36. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  37. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  38. GRB 151228B: Swift detection of a burst with an optical detection
  39. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  40. LIGO/Virgo G211117: SWASP optical observations
  41. GRB 151212A iTelescope observation
  42. V404Cyg Swift Trigger 668097: TSHAO optical observations
  43. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  44. GRB 151215A: TSHAO optical observations
  45. GRB151215A: Continued P60 Observations
  46. GRB151215A: Early optical light curve from pt5m, La Palma
  47. GRB 151215A: MITSuME Akeno optical upper limits
  48. GRB151215A: Swift/UVOT detection
  49. GRB 151215A: MASTER early OT detection and light curve
  50. GRB 151215A: NOT spectroscopy and redshift
  51. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  52. GRB151215A: P60 Optical Afterglow Candidate
  53. GRB151212A: Swift/UVOT observations
  54. GRB 151212A: GROND Optical Afterglow Candidate
  55. GRB 151210A: Swift/UVOT Upper Limits
  56. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  57. GRB 151205C: Optical follow-up observations at Kiso
  58. GRB 151205B: Deep GROND Upper limits
  59. GRB 130831A: MASTER early OT detection and LC
  60. GRB 151205B: MASTER-NET early optical observations
  61. GRB 151205A: Swift/UVOT Upper Limits
  62. GRB 151127A iTelescope observation
  63. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  64. GRB 151127A: Swift/UVOT Upper Limits
  65. GRB 151127A: LCOGT-SSO optical upper limits
  66. GRB 151118A iTelescope observation
  67. GRB 151122A: Swift/UVOT Observations
  68. GRB 151027A: Maidanak optical observations
  69. GRB 151118A: MITSuME Akeno optical upper limits
  70. GRB 151118A: AAO optical upper limit
  71. GRB 151120A: GROND optical/NIR afterglow
  72. GRB 151118A: Early optical limit from pt5m, La Palma
  73. GRB 151118A: ISON-NM early optical limit
  74. GRB 151118A: Swift/UVOT Upper Limits
  75. GRB GRB 151118A: MASTER-NET optical observations
  76. GRB 151118A: Optical observations from OSN
  77. GRB151027A; Optical observations
  78. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  79. GRB 151114A: LCOGT-FTS afterglow observations
  80. GRB 151114A: Swift detection of a burst with an optical counterpart
  81. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  82. GRB 151112A: Swift/UVOT Upper Limits
  83. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  84. GRB 151112A: MASTER-NET optical limit
  85. GRB 151111A: Swift/UVOT upper limits
  86. GRB 151111A: LCOGT-FTS afterglow observations
  87. IPN triangulation of GRB151107B
  88. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  89. GRB 151027A: continued Mondy optical observations
  90. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  91. LIGO/Virgo G194575: Liverpool Telescope observations of iPTF-15dld and iPTF-15dni
  92. GRB 151027A: Hankasalmi optical observations
  93. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  94. GRB 151107A: MASTER-NET optical observations
  95. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  96. GRB 151027A: Mondy optical observations
  97. GRB 151027A: Mt. Terskol observatory optical observation
  98. GRB 150910A: CrAO optical observations
  99. GRB 151029A: FRAM optical afterglow detection
  100. GRB 151027A: Correction to GCN 18519

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