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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"

16319 results found.

  1. GRB 180720B : TSHAO optical observations
  2. GRB 180715A: MASTER optical observation
  3. GRB 180720B: Kanata 1.5m optical/NIR observation
  4. GRB 180720B: LCO Haleakala possible bright optical candidate
  5. GRB 180718A: MASTER optical observation
  6. GRB 180718B: MASTER optical observation
  7. GRB 180715A: Gemini imaging upper limits
  8. GRB 180715A: Swift/UVOT Upper Limits
  9. GRB 180715A: COATLI Optical Observations
  10. GRB 180715A: GOTO optical limits
  11. GRB 180715A: LCO Sutherland possible optical candidate
  12. IceCube-171106A: MASTER optical observation
  13. GRB 180703A: optical afterglow confirmation
  14. IceCube-170922A: First Optical observations of the Neutrino Trigger by MASTER Global Net and 25 IceCube alerts inspection.
  15. GRB 180709A: BOOTES-5/JGT optical observations
  16. GRB 180709A: Swift/UVOT Upper Limits
  17. GRB 180709A: Optical limits
  18. GRB 180709A: COATLI Optical Observations
  19. GRB 180705A: RTT150 optical upper limit
  20. GRB 180703A: MASTER optical observation
  21. GRB 180706A: GOTO optical limits
  22. GRB 180706A: TSHAO optical observations
  23. GRB 180706A: Swift/UVOT Detection
  24. GRB 180705A: TSHAO optical upper limit
  25. GRB 180705A: Swift/UVOT Upper Limits
  26. GRB 180705A: RATIR Optical Observations
  27. GRB 180706A: COATLI Optical Detection
  28. GRB 180706A: Swift detection of a burst with optical counterpart
  29. GRB 180705A: MASTER optical observation
  30. GRB 180703A: Swift/UVOT Upper Limits
  31. GRB 180704A: Swift/UVOT Upper Limits
  32. GRB 180703A: LCO Sutherland possible optical candidate
  33. GRB 180704A: MASTER optical observation
  34. GRB 180626C : GOTO optical observations
  35. GRB 180626B : GOTO optical observations
  36. GRB 180630A: Swift detection of a burst with an optical counterpart
  37. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  38. GRB 180626A: TSHAO optical upper limit
  39. GRB 180624A: NOT optical counterpart
  40. GRB 180626A: RATIR Optical Observations
  41. GRB 180626A: KAIT Optical Upper Limit
  42. GRB 180626A: COATLI Optical Detection
  43. GRB 180624A: LCO Haleakala observations
  44. GRB 180626A: RATIR Optical Detection
  45. GRB 180626A: LCO Haleakala observations
  46. GRB 180626A: ISON-MN optical observations
  47. GRB 180626A: Swift detection of a burst with an optical counterpart
  48. GRB 180624A: RATIR Optical Observations
  49. GRB 180613A: LCO Afterglow detection
  50. GRB 180624A: GROND observations
  51. GRB 180624A: MITSuME Okayama optical upper limits
  52. GRB 180624A: Swift/UVOT Upper Limits
  53. GRB 180620A iTelescope observation
  54. GRB 180620B: VLT/X-shooter redshift
  55. GRB 180613A: Afterglow confirmation and added photometry
  56. GROND observations of GRB 180620A
  57. GRB 180620A: KAIT Optical Observations
  58. GRB 180620A: Xinglong-2.16m optical observations
  59. GRB 180618A: Swift/UVOT Detection
  60. GRB 180618A: TSHAO optical upper limit
  61. GRB 180620B: Swift detection of a burst with an optical counterpart
  62. GRB 180618A: Xinglong-2.16m optical upper limit
  63. GRB 180620A: LCO McDonald observations
  64. GRB 180620A: RATIR Optical Afterglow Detection
  65. GRB 180620A: Swift detection of a burst with an optical counterpart
  66. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  67. GRB 180618A: LT prompt observations
  68. GRB 180618A: Swift detection of a burst with an optical counterpart
  69. GRB 180614A: AbAO optical observations
  70. GRB 180614A: 1.5m OSN I-band observation
  71. GRB 180614A: Swift/UVOT Upper Limits
  72. GRB 180614A: NOT optical upper limits
  73. GRB 180614A: MASTER observation
  74. GRB 180613A: Swift/UVOT Upper Limits
  75. GW170817/GRB170817A: LBT optical detection
  76. GRB 180602A: MITSuME Ishigakijima optical upper limits
  77. GRB 180602A: Swift/UVOT Upper Limits
  78. GRB 180602A: MITSuME Akeno optical upper limits
  79. GRB 180602A: MITSuME Okayama optical upper limits
  80. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  81. GRB 180514A: MITSuME Ishigakijima optical upper limits
  82. GRB 180514A: CrAO/ZTSH optical observations and afterglow candidate
  83. GRB 180514A: Swift/UVOT Upper Limits
  84. GRB 180514A: MITSuME Akeno optical upper limits
  85. GRB 180514A: Detection limits from 2.5m NOT
  86. GRB 180510A: MITSuME Ishigakijima optical upper limits
  87. GRB 180514A: 1.5m OSN optical observations
  88. GRB 180514A: GOTO Optical Observations
  89. GRB 180512A: VLT/HAWK-I NIR Observations
  90. GRB 180512A: RATIR Optical Observations
  91. GRB 180512A: LBT optical detection
  92. GRB 180512A: Swift/UVOT Upper Limits
  93. GRB 180512A: LT prompt observations
  94. GRB 180512A: NOT upper limits
  95. GRB 180512A: OASDG optical observations
  96. GRB 180510B: VLT/X-shooter observations
  97. GRB 180510B: TAROT La Silla observatory optical observations
  98. GRB 180510B: Swift detection of a burst with an optical counterpart
  99. GRB 180504A: Swift/UVOT Upper Limits
  100. GRB 180504A: NOT afterglow candidate

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