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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"

16293 results found.

  1. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  2. GRB 161001A: Swift/UVOT Upper Limits
  3. GRB 160927A: Magellan imaging
  4. GRB 160927A: Swift/UVOT Upper Limits
  5. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  6. GRB 160927A: NOT optical observations
  7. GRB 160927A: GROND Observations
  8. GRB 160927A: TNG optical afterglow confirmation
  9. GRB160927A: D50 optical limit
  10. GRB 160927A: RTT150 optical afterglow candidate
  11. XRT refined analysis for GRB 160925A
  12. GRB 160925A/MASTER optical transient: Mondy optical observations
  13. GRB 160925A: MITSuME Akeno Optical Observations
  14. GRB 160925A: Bassano Bresciano Photometry of MASTER optical transient
  15. GRB 160925A: Optical spectroscopy of MASTER optical transient
  16. GRB 160925A / Fermi 496473540: MASTER OT observations
  17. GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN
  18. GRB 160917A: Mondy afterglow confirmation
  19. GRB 160910A: TSHAO optical observations
  20. GRB 160917A: RATIR Optical and NIR Observations
  21. GRB 160917A: Mondy optical observations
  22. GRB 160910A: Maidanak optical observations
  23. GRB 160910A: Swift/UVOT Detection
  24. GRB 160912A: RATIR Optical and NIR Observations
  25. GRB 160912A: Swift/UVOT Weak Afterglow Detection
  26. GRB 160912A: Mondy optical observations
  27. GRB 160910A: Mondy optical observations
  28. GRB 160912A Liverpool Telescope optical afterglow
  29. GRB 160910A: Global MASTER Net OT detection before LAT alert
  30. GRB 160910A: NOT afterglow confirmation
  31. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  32. GRB 160905A: Swift detection of a burst with an optical counterpart
  33. GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
  34. GRB 160826A: Swift/UVOT Upper Limits
  35. GRB 160824A: 1.5m OSN I-band observation
  36. GRB 160824A: ISON/Terskol optical observations
  37. GRB 160824A: Bassano Bresciano Observatory upper limits
  38. GRB 160821B: VLA 5.0 GHz observations
  39. GRB 160821B: Swift/UVOT Upper Limits
  40. Short GRB 160821B: MASTER early optical observations
  41. GRB 160821B: NOT optical afterglow candidate
  42. GRB 160821A: TAROT Calern observatory optical detection
  43. GRB 160816A: TSHAO optical observations
  44. GRB 160816A: ISON/UAFO optical observations
  45. GRB 160816A: Further RATIR Optical and NIR Observations
  46. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  47. GRB 160816A: confirmed fading with the LT
  48. GRB 160816A iTelescope observation
  49. GRB 160816A: RATIR Optical and NIR Observations
  50. GRB 160816A: LCOGT-FTN optical candidate
  51. GRB 160815A: GWAC-F60A upper limit
  52. GRB 160816A: MASTER inspection
  53. GRB 160815A: Swift/UVOT Afterglow Detection
  54. GRB 160804A: RATIR Optical and NIR Observations
  55. GRB 160804A: TSHAO optical observations
  56. GRB 160804A: ISON/UAFO optical observations
  57. GRB 160804A: VLT/X-shooter redshift
  58. GRB 160804A: SAO RAS optical observations
  59. GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
  60. IceCube-160731A: iPTF P48 Observations
  61. GRB 160801A: TSHAO optical observations
  62. GRB 160801A: Swift/UVOT Upper Limits
  63. GRB 160801A: SAO RAS optical observations
  64. GRB 160801A: NOT upper limits
  65. Global MASTER net follow up of IceCube-160731A
  66. Swift follow up of IceCube-160731A
  67. GRB 160801A: MITSuME Okayama upper limits
  68. GRB 160716A: TAROT La Silla observatory optical observations
  69. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  70. GRB 160716A: Swift/UVOT Detection
  71. GRB 160714A: Swift/UVOT Upper Limits
  72. Swift Trigger 704327: KAIT Optical Observations
  73. GRB 160714A: TAROT Calern observatory optical observations
  74. GRB 160623A: afterglow spectroscopy by GTC and independent redshift determination
  75. GRB 160623A: optical astrometry, photometry, and redshift
  76. Swift-BAT trigger 704327 was due to noise
  77. Swift Trigger 704327: MASTER syncronous optical observations
  78. GRB 160714A: MASTER early optical observations
  79. GRB 160714A: Optical observations from OSN
  80. GRB 160712A: Swift/UVOT Upper Limits
  81. GRB 160712A: RATIR Optical and NIR Observations
  82. GRB 160712A: Skynet R-COP observations
  83. GRB 160712A: Global MASTER-Net optical observation
  84. GRB 160625B: Global MASTER-Crimea prompt optical emission detection (fwd)
  85. GRB 160625B: TSHAO optical observations
  86. GRB 160705B: TAROT Calern observatory optical observations
  87. GRB 160629A: Mondy optical observations
  88. GRB 160629A: AbAO optical observations
  89. GRB 160703A: Keck-I/LRIS Optical Observations
  90. GRB 160705B: Swift/UVOT Upper Limits
  91. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  92. GRB 160705B: LT optical candidate
  93. GRB 160703A: Swift/UVOT Detection
  94. GRB 160703A: Swift-XRT afterglow detection
  95. GRB 160703A: MITSuME Ishigakijima Optical Observation
  96. GRB 160703A: MITSuME Akeno Optical Observations
  97. GRB 160625B: RTT150 optical observations
  98. GRB 160703A: Bassano Bresciano Observatory upper limits
  99. GRB 160703A: Zadko observatory - Gingin optical observations
  100. GRB 160629A: AbAO optical observations

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