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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19140 results found.

  1. GRB 160714A: Swift-XRT observations
  2. GRB 160712A: Swift/UVOT Upper Limits
  3. GRB 160712A: RATIR Optical and NIR Observations
  4. GRB 160712A: GROND observations
  5. GRB 160712A: Skynet R-COP observations
  6. GRB 160629A: 15 GHz detections and upper limits from AMI
  7. GRB 160624A: 15 GHz upper limits from AMI
  8. GRB 160712A: Initial Swift/UVOT observations
  9. GRB 160712A: Swift-XRT observations
  10. GRB 160625B: TSHAO optical observations
  11. GRB 160709A: Swift-XRT observations
  12. GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
  13. GRB 160709A: Fermi GBM Observations
  14. GRB 160709A: Tiled Swift observations
  15. GRB 160705B: TAROT Calern observatory optical observations
  16. GRB 160629A: Mondy optical observations
  17. GRB 160629A: AbAO optical observations
  18. GRB 160703A: Keck-I/LRIS Optical Observations
  19. GRB 160705B: Swift/UVOT Upper Limits
  20. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  21. GRB 160703A: Swift/UVOT Detection
  22. GRB 160703A: Swift-XRT afterglow detection
  23. GRB 160703A: MITSuME Akeno Optical Observations
  24. GRB 160625B: RTT150 optical observations
  25. GRB 160703A: Bassano Bresciano Observatory upper limits
  26. GRB 160703A: Zadko observatory - Gingin optical observations
  27. GRB 160629A: AbAO optical observations
  28. GRB 160629A: Swift/UVOT Upper Limits
  29. GRB 160629A: Swift-XRT afterglow detection
  30. GRB 160625B: LCOGT FTN observations
  31. GRB 160629A: Global MASTER Net Prompt OT observations
  32. GRB 160629A: Swift ToO observations
  33. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  34. GRB 160630A: Zadko observatory - Gingin optical observations
  35. GRB 160630A: TAROT La Silla observatory optical observations
  36. GRB 160629A: BTA and GTC redshift
  37. GRB 160630A: Swift/UVOT Upper Limits
  38. GRB 160625A: GROND upper limits
  39. GRB 160630A: REM NIR observations
  40. GRB 160630A: GROND Afterglow Detection
  41. GRB 160629A: SAO RAS independent OT detection
  42. GRB 160629A: TAROT Calern observatory optical detection
  43. GRB 160625B: TSHAO optical observations, correction GCN 19619
  44. GRB 160625B: TSHAO optical observations
  45. GRB 160625B: SMARTS optical/IR afterglow observations
  46. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  47. GRB 160623A: SAO RAS optical observations
  48. GRB 160625B: SAO RAS optical observations
  49. GRB 160625B: 15 GHz detection from AMI
  50. GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI
  51. GRB 160601A: 15 GHz upper limits from AMI
  52. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  53. GRB 160625B: VLA Detection
  54. GRB 160625B: TSHAO optical observations
  55. Konus-Wind observation of GRB 160625B
  56. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  57. GRB 160625B: RATIR Optical and NIR Observations
  58. GRB 160625B: VLT/X-shooter redshift
  59. Swift Trigger 701668 is probably not an astrophysical event
  60. GRB 160625A: Swift/UVOT Upper Limits
  61. GRB 160625B: Swift/UVOT Detection
  62. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  63. GRB 160625B: Fermi-LAT refined analysis
  64. GRB 160625B: Swift-XRT afterglow detection
  65. GRB 160623A: SMA submm afterglow observations
  66. GRB 160625B: Tiled Swift observations
  67. GRB 160625B: Fermi GBM initial observations
  68. GRB 160625B: Fermi-LAT detection of a bright burst
  69. GRB 160625A - two different events?
  70. GRB 160625A: Swift-XRT observations
  71. GRB 160624A: Swift/UVOT Upper Limits
  72. GRB 160624A: Lulin observation
  73. GRB 160623A: TSHAO optical observations
  74. GRB 160623A: Swift/UVOT Upper Limits
  75. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  76. GRB160624A:possible GRB host redshift
  77. GRB 160525B: 15 GHz upper limits from AMI
  78. GRB 160521B: 15 GHz upper limits from AMI
  79. GRB 160623A: Mondy optical observations
  80. Swift detection of a dust-scattered halo around GRB 160623A
  81. GRB 160623A: Swift-XRT afterglow detection
  82. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  83. GRB 160623A: Swift ToO observations
  84. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  85. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  86. GRB 160612A: Swift-XRT observations
  87. BAT detection and localization of GRB 160612A
  88. GRB 160612A: Swift ToO observations
  89. GRB 160521A: 15 GHz detections and upper limit from AMI
  90. GRB 160519A: 15 GHz upper limits from AMI
  91. GRB 160509A: 15 GHz upper limits from AMI
  92. GRB 160611A: Swift/UVOT observations
  93. GRB 160611A: Swift-XRT observations
  94. GRB 160607A: Swift/UVOT Upper Limits
  95. GRB 160607A: GROND confirmation of the afterglow
  96. GRB 160504A: 15 GHz upper limits from AMI
  97. GRB 160417A: 15 GHz upper limits from AMI
  98. GRB 160408A: 15 GHz upper limits from AMI
  99. GRB 160607A: candidate optical afterglow from the NOT
  100. GRB 160530A: further Swift-XRT follow-up observations

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