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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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
  1. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  2. GRB 160705B: Swift-BAT refined analysis
  3. GRB 160623A: Astrosat CZTI detection
  4. GRB 160705B: Swift-XRT refined Analysis
  5. GRB 160705B: Enhanced Swift-XRT position
  6. GRB 160705B: LT optical candidate
  7. GRB 160705B: Swift detection of a burst
  8. GRB 160703A: Swift/UVOT Detection
  9. GRB 160703A: Swift-XRT afterglow detection
  10. GRB 160705A/MAXI J0748-149: MAXI/GSC detection
  11. GRB 160703A: MITSuME Ishigakijima Optical Observation
  12. GRB 160703A: MITSuME Akeno Optical Observations
  13. GRB 160625B: RTT150 optical observations
  14. GRB 160703A: Bassano Bresciano Observatory upper limits
  15. Konus-Wind observation of GRB 160703A
  16. GRB 160703A: Swift-BAT refined analysis
  17. GRB 160703A: Zadko observatory - Gingin optical observations
  18. GRB 160629A: AbAO optical observations
  19. GRB 160703A: Swift detection of a burst
  20. Swift trigger #702630 is not an astrophysical event
  21. GRB 160629A: Swift/UVOT Upper Limits
  22. GRB 160625B: SAO RAS monitoring
  23. GRB 160629A: Swift-XRT afterglow detection
  24. GRB 160625B: LCOGT FTN observations
  25. GRB 160630A: Swift-BAT refined analysis
  26. GRB 160629A: Global MASTER Net Prompt OT observations
  27. GRB 160629A: Swift ToO observations
  28. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  29. Konus-Wind observation of GRB 160629A
  30. GRB 160630A: Zadko observatory - Gingin optical observations
  31. GRB 160630A: TAROT La Silla observatory optical observations
  32. GRB 160629A: BTA and GTC redshift
  33. GRB 160630A: Swift/UVOT Upper Limits
  34. GRB 160630A: Swift-XRT refined Analysis
  35. GRB 160625A: GROND upper limits
  36. GRB 160629A: Fermi GBM observation
  37. GRB 160630A: REM NIR observations
  38. GRB 160630A: Enhanced Swift-XRT position
  39. GRB 160630A: GROND Afterglow Detection
  40. GRB 160630A: Swift detection of a burst
  41. GRB 160629A: SAO RAS independent OT detection
  42. GRB 160629A: TAROT Calern observatory optical detection
  43. GRB 160629A: a long GBB detected by INTEGRAL
  44. GRB 160625B: TSHAO optical observations, correction GCN 19619
  45. GRB 160625B: TSHAO optical observations
  46. Konus-Wind observation of GRB 160620A
  47. GRB 160625B CALET Gamma-Ray Burst Monitor detection
  48. GRB 160625B: SMARTS optical/IR afterglow observations
  49. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  50. GRB 160623A: SAO RAS optical observations
  51. Konus-Wind observation of a bright burst from SGR 1935+2154
  52. GRB 160625B: Global MASTER-Net prompt optical emission detection
  53. GRB 160625B: SAO RAS optical observations
  54. GRB 160625B: 15 GHz detection from AMI
  55. GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI
  56. GRB 160601A: 15 GHz upper limits from AMI
  57. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  58. GRB 160625B: VLA Detection
  59. GRB 160625B: TSHAO optical observations
  60. Konus-Wind observation of GRB 160625B
  61. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  62. GRB 160625B: RATIR Optical and NIR Observations
  63. GRB 160625B: TNG redshift confirmation
  64. GRB 160625B: VLT/X-shooter redshift
  65. GRB 160625B: MITSuME Ishigakijima Optical Observation
  66. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  67. GRB 160623A CALET Gamma-Ray Burst Monitor detection
  68. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  69. Swift Trigger 701668 is probably not an astrophysical event
  70. IPN Triangulation of GRB 160620A (short/hard)
  71. GRB 160625A: Swift/UVOT Upper Limits
  72. GRB 160625A: Swift-BAT refined analysis
  73. GRB 160625A: Swift-XRT refined Analysis
  74. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  75. GRB 160625B: Swift/UVOT Detection
  76. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  77. GRB 160625B: Fermi GBM refined analysis
  78. GRB 160625B: Fermi-LAT refined analysis
  79. GRB 160625B: Swift-XRT afterglow detection
  80. GRB 160623A: SMA submm afterglow observations
  81. GRB 160625A: Enhanced Swift-XRT position
  82. GRB 160625B: Tiled Swift observations
  83. GRB 160625B: Fermi GBM initial observations
  84. GRB 160625B: Fermi-LAT detection of a bright burst
  85. GRB 160625A - two different events?
  86. GRB 160625A: Swift-XRT observations
  87. GRB 160625A: Swift detection of a burst
  88. GRB 160624A: Swift/UVOT Upper Limits
  89. GRB 160624A: Lulin observation
  90. GRB 160623A: TSHAO optical observations
  91. GRB 160624A: Swift-XRT refined Analysis
  92. GRB 160623A: MITSuME Ishigakijima Optical Observation
  93. GRB 160624A: MITSuME Ishigakijima upper limits
  94. GRB 160624A: Fermi GBM observation
  95. GRB 160624A, Swift-BAT refined analysis
  96. GRB 160623A: Swift/UVOT Upper Limits
  97. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  98. GRB 160624A: Enhanced Swift-XRT position
  99. GRB160624A:possible GRB host redshift
  100. GRB 160525B: 15 GHz upper limits from AMI

Advanced

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