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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"

16293 results found.

  1. GRB 160104A: ISON-Ussuriysk optical observations
  2. GRB 160117B: GROND optical/NIR afterglow observations
  3. GRB 160117B: VLT/X-shooter spectroscopy
  4. GRB 160117B: iTelescope T17 optical observations
  5. GRB 160117B: NOT optical afterglow observations
  6. GRB 160117B: Swift/UVOT Detection
  7. GRB 160117B: LCOGT-SSO optical observations
  8. GRB 160117B: MASTER-Amur OT observations
  9. GRB 160117B: Swift detection of a burst with optical counterpart
  10. LIGO/Virgo G211117: INAF NOT follow-up of PanStarrs candidates
  11. GRB 160113A: Swift-XRT observations
  12. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  13. GRB 160104A: Swift/UVOT Detection
  14. LIGO/Virgo G211117: iPTF Observations of PS15dpn
  15. GRB 160104A: Continued MITSuME Akeno Optical Observation
  16. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  17. LIGO/Virgo G211117: Further Swift-XRT sources
  18. GRB 160104A: Nishi-Harima MINT Observations
  19. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  20. GRB 160104A: GWAC upper limit during prompt emission phase
  21. GRB 160104A: MITSuME Okayama upper limits
  22. GRB 160104A: Xinglong TNT optical observation
  23. LIGO/Virgo G211117: INAF TNG follow-up of Kanata telescope candidate
  24. GRB 160104A: MASTER early OT detection
  25. GRB 160104A: MITSuME Akeno Optical Observation
  26. GRB 160101A: MITSuME Akeno optical upper limits
  27. GRB 160101A: Swift/UVOT Detection
  28. LIGO/Virgo G211117: INAF TNG follow-up of MASTER OT J020906.21+013800.1
  29. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  30. V404Cyg Swift Trigger 668097: AbAO optical observations
  31. GRB 151229A: MITSuME Akeno optical upper limits
  32. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  33. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  34. GRB 151229A: MITSuME Okayama upper limits
  35. GRB 151228B: MITSuME Akeno optical upper limits
  36. GRB 151229A: Swift/UVOT observations
  37. GRB 151228A: MITSuME Akeno optical upper limits
  38. GRB 151228A: T60 observations
  39. LIGO/Virgo G211117: DESGW program observations with DECam
  40. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  41. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  42. GRB 151228B: Swift detection of a burst with an optical detection
  43. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  44. LIGO/Virgo G211117: SWASP optical observations
  45. GRB 151212A iTelescope observation
  46. V404Cyg Swift Trigger 668097: TSHAO optical observations
  47. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  48. GRB 151215A: TSHAO optical observations
  49. GRB151215A: Continued P60 Observations
  50. GRB151215A: Early optical light curve from pt5m, La Palma
  51. GRB 151215A: MITSuME Akeno optical upper limits
  52. GRB151215A: Swift/UVOT detection
  53. GRB 151215A: MASTER early OT detection and light curve
  54. GRB 151215A: NOT spectroscopy and redshift
  55. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  56. GRB151215A: P60 Optical Afterglow Candidate
  57. GRB151212A: Swift/UVOT observations
  58. GRB 151212A: GROND Optical Afterglow Candidate
  59. GRB 151210A: Swift/UVOT Upper Limits
  60. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  61. GRB 151205C: Optical follow-up observations at Kiso
  62. GRB 151205B: Deep GROND Upper limits
  63. GRB 130831A: MASTER early OT detection and LC
  64. GRB 151205B: MASTER-NET early optical observations
  65. GRB 151205A: Swift/UVOT Upper Limits
  66. GRB 151127A iTelescope observation
  67. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  68. GRB 151127A: Swift/UVOT Upper Limits
  69. GRB 151127A: LCOGT-SSO optical upper limits
  70. GRB 151118A iTelescope observation
  71. GRB 151122A: Swift/UVOT Observations
  72. GRB 151027A: Maidanak optical observations
  73. GRB 151118A: MITSuME Akeno optical upper limits
  74. GRB 151118A: AAO optical upper limit
  75. GRB 151120A: GROND optical/NIR afterglow
  76. GRB 151118A: Early optical limit from pt5m, La Palma
  77. GRB 151118A: ISON-NM early optical limit
  78. GRB 151118A: Swift/UVOT Upper Limits
  79. GRB GRB 151118A: MASTER-NET optical observations
  80. GRB 151118A: Optical observations from OSN
  81. GRB151027A; Optical observations
  82. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  83. GRB 151114A: LCOGT-FTS afterglow observations
  84. GRB 151114A: Swift detection of a burst with an optical counterpart
  85. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  86. GRB 151112A: Swift/UVOT Upper Limits
  87. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  88. GRB 151112A: MASTER-NET optical limit
  89. GRB 151111A: Swift/UVOT upper limits
  90. GRB 151111A: LCOGT-FTS afterglow observations
  91. IPN triangulation of GRB151107B
  92. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  93. GRB 151027A: continued Mondy optical observations
  94. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  95. LIGO/Virgo G194575: Liverpool Telescope observations of iPTF-15dld and iPTF-15dni
  96. GRB 151027A: Hankasalmi optical observations
  97. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  98. GRB 151107A: MASTER-NET optical observations
  99. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  100. GRB 151027A: Mondy optical observations

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