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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"

16153 results found.

  1. Swift Trigger 704327: KAIT Optical Observations
  2. GRB 160714A: TAROT Calern observatory optical observations
  3. GRB 160623A: afterglow spectroscopy by GTC and independent redshift determination
  4. GRB 160623A: optical astrometry, photometry, and redshift
  5. Swift-BAT trigger 704327 was due to noise
  6. Swift Trigger 704327: MASTER syncronous optical observations
  7. GRB 160714A: MASTER early optical observations
  8. GRB 160714A: Optical observations from OSN
  9. GRB 160712A: Swift/UVOT Upper Limits
  10. GRB 160712A: RATIR Optical and NIR Observations
  11. GRB 160712A: Skynet R-COP observations
  12. GRB 160629A: 15 GHz detections and upper limits from AMI
  13. GRB 160712A: Global MASTER-Net optical observation
  14. GRB 160625B: Global MASTER-Crimea prompt optical emission detection (fwd)
  15. GRB 160625B: TSHAO optical observations
  16. GRB 160705B: TAROT Calern observatory optical observations
  17. GRB 160629A: Mondy optical observations
  18. GRB 160629A: AbAO optical observations
  19. GRB 160703A: Keck-I/LRIS Optical Observations
  20. GRB 160705B: Swift/UVOT Upper Limits
  21. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  22. GRB 160705B: LT optical candidate
  23. GRB 160703A: Swift/UVOT Detection
  24. GRB 160703A: Swift-XRT afterglow detection
  25. GRB 160703A: MITSuME Ishigakijima Optical Observation
  26. GRB 160703A: MITSuME Akeno Optical Observations
  27. GRB 160625B: RTT150 optical observations
  28. GRB 160703A: Bassano Bresciano Observatory upper limits
  29. GRB 160703A: Zadko observatory - Gingin optical observations
  30. GRB 160629A: AbAO optical observations
  31. GRB 160629A: Swift/UVOT Upper Limits
  32. GRB 160625B: SAO RAS monitoring
  33. GRB 160629A: Swift-XRT afterglow detection
  34. GRB 160625B: LCOGT FTN observations
  35. GRB 160629A: Global MASTER Net Prompt OT observations
  36. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  37. GRB 160630A: Zadko observatory - Gingin optical observations
  38. GRB 160630A: TAROT La Silla observatory optical observations
  39. GRB 160629A: BTA and GTC redshift
  40. GRB 160630A: Swift/UVOT Upper Limits
  41. GRB 160630A: REM NIR observations
  42. GRB 160629A: SAO RAS independent OT detection
  43. GRB 160629A: TAROT Calern observatory optical detection
  44. GRB 160625B: TSHAO optical observations, correction GCN 19619
  45. GRB 160625B: TSHAO optical observations
  46. GRB 160625B: SMARTS optical/IR afterglow observations
  47. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  48. GRB 160623A: SAO RAS optical observations
  49. GRB 160625B: Global MASTER-Net prompt optical emission detection
  50. GRB 160625B: SAO RAS optical observations
  51. GRB 160625B: VLA Detection
  52. GRB 160625B: TSHAO optical observations
  53. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  54. GRB 160625B: RATIR Optical and NIR Observations
  55. GRB 160625B: TNG redshift confirmation
  56. GRB 160625B: VLT/X-shooter redshift
  57. GRB 160625B: MITSuME Ishigakijima Optical Observation
  58. GRB 160625A: Swift/UVOT Upper Limits
  59. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  60. GRB 160623A: SMA submm afterglow observations
  61. GRB 160625A - two different events?
  62. GRB 160624A: Swift/UVOT Upper Limits
  63. GRB 160623A: TSHAO optical observations
  64. GRB 160623A: MITSuME Ishigakijima Optical Observation
  65. GRB 160624A: MITSuME Ishigakijima upper limits
  66. GRB 160623A: Swift/UVOT Upper Limits
  67. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  68. GRB 160623A: Mondy optical observations
  69. GRB 160611A: Swift/UVOT observations
  70. GRB160611.9 MASTER-Net OT detection
  71. GRB 160607A: Swift/UVOT Upper Limits
  72. GRB 160607A: candidate optical afterglow from the NOT
  73. GRB 160601A: AbAO optical observations
  74. GRB 160601A: Discovery Channel Telescope Limits
  75. GRB 160601A: Swift/UVOT Upper Limits
  76. GRB 160601A: MITSuME Akeno optical upper limits
  77. GRB160601A: Gemini Imaging
  78. GRB 160601A: Mondy optical observations, photometry of NOT sources
  79. GRB160601A: Kanata Telescope I- and Ks-bands upper limits
  80. GRB160601A: NOT afterglow confirmation
  81. GRB160601A: NOT detection of an afterglow candidate
  82. GRB 160601A: Mondy optical observations
  83. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  84. GRB 160601A: MITSuME Okayama upper limits
  85. GRB 160601A: MASTER-Net observations
  86. GRB 160525B: MITSuME Akeno optical upper limits
  87. GRB 160525B: Mondy optical upper limit
  88. GRB 160525B: Khureltogot optical upper limit
  89. GRB 160525B: Nanshan optical upper limit
  90. GRB 160425A: SMARTS late-time observations
  91. GRB 160521B: Swift/UVOT Upper Limits
  92. SGR 1935+2154: AbAO optical upper limit
  93. GRB 160509A MASTER-NET observations
  94. GRB 160509A: TLS Tautenburg Afterglow Detection
  95. GRB 160509A: Further Swift/UVOT Observations
  96. GRB 160509A Gemini North redshift
  97. GRB 160509A: DCT Imaging / Afterglow Confirmation
  98. GRB 160509A: VLA Detection
  99. GRB 160509A: Swift/UVOT Upper Limit
  100. GRB 160509A: optical observations

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