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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"

21089 results found.

  1. GRB 180720B : Fermi-LAT detection
  2. GRB 180720B : TSHAO optical observations
  3. GRB 180715A: MASTER optical observation
  4. GRB 180718A: MASTER optical observation
  5. GRB 180718B: MASTER optical observation
  6. GRB180715B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 553369644)
  7. GRB 180715A: Gemini imaging upper limits
  8. GRB 180715A: Swift/UVOT Upper Limits
  9. GRB 180718A: Swift ToO observations
  10. GRB 180718B: Swift ToO observations
  11. Swift Trigger 848621 is not an astrophysical event
  12. GRB 180715A: LCO Sutherland observations
  13. GRB 180715A: COATLI Optical Observations
  14. GRB 180715A: Swift-XRT observations
  15. GRB 180715A: GOTO optical limits
  16. GRB 180715A: Swift-XRT observations
  17. IceCube-171106A: MASTER optical observation
  18. IceCube-170922A: First Optical observations of the Neutrino Trigger by MASTER Global Net and 25 IceCube alerts inspection.
  19. GRB 180705A: OSN observations
  20. GRB 180709A: BOOTES-5/JGT optical observations
  21. GRB 180709A: Swift/UVOT Upper Limits
  22. GRB 180709A: COATLI Optical Observations
  23. GRB 180703A: Swift-XRT afterglow detection
  24. GRB 180703A: MASTER optical observation
  25. GRB 180706A: GOTO optical limits
  26. GRB 180706A: TSHAO optical observations
  27. GRB 180706A: Swift/UVOT Detection
  28. GRB 180705A: Swift/UVOT Upper Limits
  29. GRB 180705A: RATIR Optical Observations
  30. GRB 180706A: COATLI Optical Detection
  31. GRB 180705A: MASTER optical observation
  32. GRB 180705A: Swift-XRT observations
  33. GRB 180703A: Swift/UVOT Upper Limits
  34. GRB 180704A: Swift/UVOT Upper Limits
  35. GRB 180703A: Swift-XRT observations
  36. GRB150101B: INTEGRAL prompt gamma-ray signal from a possible GRB170817A-analogue
  37. GRB 180703B: CALET Gamma-Ray Burst Monitor detection
  38. GRB 180704A: Swift-XRT observations
  39. GRB 180704A: MASTER optical observation
  40. GRB 180703A: Tiled Swift observations
  41. GRB 180630A: Swift/UVOT Detection
  42. GRB 180626C : GOTO optical observations
  43. GRB 180626B : GOTO optical observations
  44. GRB 180626C / Fermi trigger 551697835: MASTER inspection
  45. GRB 180626C: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 551697835)
  46. GRB 180624A: NOT optical counterpart
  47. GRB 180626A: RATIR Optical Observations
  48. GRB 180626A: KAIT Optical Upper Limit
  49. GRB 180624A: LCO Haleakala observations
  50. GRB 180626A: Swift/UVOT Detection
  51. GRB 180626A: LCO Haleakala observations
  52. GRB 180626A: ISON-MN optical observations
  53. GRB 180624A: RATIR Optical Observations
  54. GRB 180624A: LBT/MODS redshift measurement
  55. GRB 180613A: LCO Afterglow detection
  56. GRB 180624A: GROND observations
  57. GRB 180624A: Swift/UVOT Upper Limits
  58. GRB 180623A: Swift/UVOT Detection
  59. GRB 180620B: Swift/UVOT Detection
  60. GRB 180620B: VLT/X-shooter redshift
  61. GRB 180613A: Afterglow confirmation and added photometry
  62. GROND observations of GRB 180620B
  63. GROND observations of GRB 180620A
  64. GRB 180620A: KAIT Optical Observations
  65. GRB 180620A: Xinglong-2.16m optical observations
  66. GRB 180618A: Swift/UVOT Detection
  67. GRB 180620A: Swift/UVOT Detection
  68. GRB 180620A: LCO McDonald observations
  69. GRB 180620A: MASTER OT observation
  70. GRB 180620A: RATIR Optical Afterglow Detection
  71. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  72. GRB 180618A: LT prompt observations
  73. GRB 180614A: AbAO optical observations
  74. GRB 180614A: Swift/UVOT Upper Limits
  75. GRB 180614A: NOT optical upper limits
  76. GRB 180614A: MASTER observation
  77. GRB 180613A: Swift/UVOT Upper Limits
  78. GRB 180613A GROND observations: correction
  79. GRB 180613A GROND observations
  80. GRB 180613A: Possible IR afterglow
  81. GW170817/GRB170817A: LBT optical detection
  82. GRB 180602A: Swift/UVOT Upper Limits
  83. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  84. GRB 180514A: CrAO/ZTSH optical observations and afterglow candidate
  85. GRB 180514A: Swift/UVOT Upper Limits
  86. GRB 180514A: 1.5m OSN optical observations
  87. GRB 180514A: GOTO Optical Observations
  88. GRB 180512A: VLT/HAWK-I NIR Observations
  89. GRB 180512A: RATIR Optical Observations
  90. GRB 180512A: LBT optical detection
  91. GRB 180512A: Swift/UVOT Upper Limits
  92. GRB 180512A: LT prompt observations
  93. GRB 180512A: GROND upper limits
  94. GRB 180512A: NOT upper limits
  95. GRB 180512A: OASDG optical observations
  96. GRB 180512A: Upper limits from OSN
  97. GRB 180510A: Swift/UVOT followup observations
  98. GRB 180510B: VLT/X-shooter observations
  99. GRB 180510B: GROND detection in all bands
  100. GRB 180510B: TAROT La Silla observatory optical observations

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