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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"

16154 results found.

  1. GRB 161014A: VLT/X-shooter redshift confirmation
  2. GRB 161014A: refined analysis of TSHAO optical observations
  3. GRB 161014A: RATIR Optical and NIR Observations
  4. GRB 161014A: TNG optical observations
  5. GRB 161014A: AROMA-N Optical Observation
  6. GRB 161014A: Continued MITSuME Akeno Optical Observation
  7. GRB 161014A: Swift/UVOT Detection
  8. GRB161014A: NOT optical observations
  9. GRB 161014A: TSHAO optical observations
  10. GRB 161011A: RATIR Optical and NIR Observations
  11. GRB 161014A: Kanata optical observation
  12. GRB 161014A : Xinglong TNT optical observation
  13. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  14. GRB 161014A: MITSuME-Akeno optical observation
  15. GRB 161011A: Swift/UVOT Upper Limits
  16. GRB 161007A: NOT optical observations
  17. GRB 161007A: AbAO optical observations
  18. GRB 161007A: Mondy optical observations
  19. GRB 161007A: Swift/UVOT Upper Limits
  20. GRB 161004A: Maidanak optical observations
  21. GRB 161004A: refined analysis of TSHAO optical observations
  22. GRB 161007A: MASTER-net early optical observations
  23. GRB 160821A: Maisoncelles observatory optical observations
  24. GRB 160925A: Kottamia R-band observation
  25. GRB 160927A: GTC observations
  26. GRB 150302A: late-time imaging and optical afterglow confirmation
  27. GRB 161004B: Swift/UVOT Upper Limits
  28. GRB 161004A: RATIR Optical and NIR Observations
  29. GRB 161004A: SAO RAS optical upper limit
  30. GRB 161004A: Bassano Bresciano Observatory upper limit
  31. GRB 161004A: TSHAO optical observations
  32. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  33. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  34. GRB 161001A: Swift/UVOT Upper Limits
  35. GRB 160927A: Magellan imaging
  36. GRB 160927A: Swift/UVOT Upper Limits
  37. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  38. GRB 160927A: NOT optical observations
  39. GRB 160927A: TNG optical afterglow confirmation
  40. GRB160927A: D50 optical limit
  41. GRB 160927A: RTT150 optical afterglow candidate
  42. XRT refined analysis for GRB 160925A
  43. GRB 160925A/MASTER optical transient: Mondy optical observations
  44. GRB 160925A: MITSuME Akeno Optical Observations
  45. GRB 160925A: Bassano Bresciano Photometry of MASTER optical transient
  46. GRB 160925A: Optical spectroscopy of MASTER optical transient
  47. GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN
  48. GRB 160917A: Mondy afterglow confirmation
  49. GRB 160910A: TSHAO optical observations
  50. GRB 160917A: RATIR Optical and NIR Observations
  51. GRB 160917A: Mondy optical observations
  52. GRB 160910A: Maidanak optical observations
  53. GRB 160910A: Swift/UVOT Detection
  54. GRB 160912A: RATIR Optical and NIR Observations
  55. GRB 160912A: Swift/UVOT Weak Afterglow Detection
  56. GRB 160912A: Mondy optical observations
  57. GRB 160910A: Mondy optical observations
  58. GRB 160912A Liverpool Telescope optical afterglow
  59. GRB 160910A: Global MASTER Net OT detection before LAT alert
  60. GRB 160910A: NOT afterglow confirmation
  61. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  62. GRB 160905A: Swift detection of a burst with an optical counterpart
  63. GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
  64. GRB 160826A: Swift/UVOT Upper Limits
  65. GRB 160824A: 1.5m OSN I-band observation
  66. GRB 160824A: ISON/Terskol optical observations
  67. GRB 160824A: Bassano Bresciano Observatory upper limits
  68. GRB 160821B: VLA 5.0 GHz observations
  69. GRB 160821B: Swift/UVOT Upper Limits
  70. Short GRB 160821B: MASTER early optical observations
  71. GRB 160821B: NOT optical afterglow candidate
  72. GRB 160821A: TAROT Calern observatory optical detection
  73. GRB 160816A: TSHAO optical observations
  74. GRB 160816A: ISON/UAFO optical observations
  75. GRB 160816A: Further RATIR Optical and NIR Observations
  76. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  77. GRB 160816A: confirmed fading with the LT
  78. GRB 160816A iTelescope observation
  79. GRB 160816A: RATIR Optical and NIR Observations
  80. GRB 160816A: LCOGT-FTN optical candidate
  81. GRB 160815A: GWAC-F60A upper limit
  82. GRB 160816A: MASTER inspection
  83. GRB 160815A: Swift/UVOT Afterglow Detection
  84. GRB 160804A: RATIR Optical and NIR Observations
  85. GRB 160804A: TSHAO optical observations
  86. GRB 160804A: ISON/UAFO optical observations
  87. GRB 160804A: VLT/X-shooter redshift
  88. GRB 160804A: SAO RAS optical observations
  89. GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
  90. IceCube-160731A: iPTF P48 Observations
  91. GRB 160801A: TSHAO optical observations
  92. GRB 160801A: Swift/UVOT Upper Limits
  93. GRB 160801A: SAO RAS optical observations
  94. GRB 160801A: NOT upper limits
  95. Global MASTER net follow up of IceCube-160731A
  96. Swift follow up of IceCube-160731A
  97. GRB 160801A: MITSuME Okayama upper limits
  98. GRB 160716A: TAROT La Silla observatory optical observations
  99. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  100. GRB 160716A: Swift/UVOT Detection

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