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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"

6667 results found.

  1. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  2. ANTARES neutrino detection: Fermi GBM Observations
  3. LIGO/Virgo G184098: SkyMapper observations
  4. LIGO/Virgo G184098: Swift follow-up observations
  5. GRB 150915A: Swift-XRT refined Analysis
  6. GRB150915A : IRSF NIR upper limits
  7. GRB 150906B: Further analysis of the Konus-Wind data
  8. GRB 150910A: TSHAO optical observations
  9. GRB 150910A: T100 observations
  10. GRB 150907A: Swift-XRT afterglow detection
  11. GRB 150912A: Swift-XRT and UVOT observations
  12. GRB 150912A: Fermi GBM observation
  13. GRB 150911A: Swift-XRT refined Analysis
  14. GRB 150910A: continued SAO RAS optical observations
  15. GRB150911A MITSuME Okayama Ks-band upper-limit
  16. GRB 150910A: TSHAO optical observations
  17. GRB 150910A: MITSuME Okayama Ks-band Observation
  18. GRB 150910A: SAO RAS optical photometry
  19. GRB 150910A: Swift-XRT refined Analysis
  20. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  21. GRB 150907B: Swift-XRT refined Analysis
  22. GRB 150907A: Swift-XRT observations
  23. GRB 150906A: Fermi GBM detection
  24. GRB 150902A: Swift-XRT afterglow detection
  25. GRB 150902A: Swift-XRT observations
  26. GRB 150902A: Fermi GBM detection
  27. GRB 150902A: Fermi-LAT detection
  28. GRB 150821A: Flattening in the UVOT light curve
  29. GRB 150831B: Swift-XRT refined Analysis
  30. GRB 150831B: Fermi GBM detection
  31. GRB 150831A: Swift/UVOT Upper Limits
  32. GRB 150831A: Swift-XRT refined Analysis
  33. GRB 150824A: Fermi GBM detection
  34. GRB 150821A: Swift-XRT refined Analysis
  35. GRB 150819A: Mondy and TSHAO optical upper limits
  36. GRB 150821A: Fermi GBM detection
  37. GRB150819A: NOT imaging
  38. GRB 150818A: Continued NOT monitoring - afterglow confirmation
  39. GRB 150819B: Fermi GBM detection
  40. GRB 150819A: Swift-XRT refined Analysis
  41. GRB 150818A: Swift-XRT update, correction to GCN 18162
  42. GRB 150818A: Swift-XRT refined Analysis
  43. GRB 150817A: Fermi GBM observation
  44. GRB 150817A: Swift-XRT refined Analysis
  45. GRB 150811A: KAIT Refined Analysis
  46. GRB 150811B: Fermi GBM detection
  47. GRB 150811A: SAO RAS optical observations
  48. GRB 150811A: Swift-XRT refined Analysis
  49. GRB 150810A: Fermi GBM detection
  50. GRB 150727A: IRSF NIR observation
  51. GRB 150801A: Swift-XRT observations
  52. GRB 150801B: Swift-XRT refined Analysis
  53. GRB 150724B: Swift-XRT afterglow detection
  54. GRB 150728A: TSHAO optical observations
  55. GRB 150728A: Swift-XRT refined Analysis
  56. GRB 150727A: Swift-XRT refined Analysis
  57. GRB 150727A: Fermi GBM detection
  58. GRB 150724B: Swift-XRT observations
  59. GRB 150724B: Fermi GBM detection
  60. GRB 150724B: Fermi-LAT detection
  61. Correction to GCN 18059: Parameterisation of Swift-XRT light curve
  62. GRB 150724A: Swift-XRT refined Analysis
  63. GRB 150724A: Swift-BAT refined analysis
  64. GRB 150722A: Swift-XRT refined Analysis
  65. GRB 150721A: Fermi GBM detection
  66. GRB 150720A: Swift-XRT refined Analysis
  67. GRB 150716A: Swift-XRT refined Analysis
  68. GRB 150710B: Swift-XRT afterglow detection
  69. GRB 150710B: Swift-XRT and Swift-UVOT observations
  70. GRB 150711A: Swift-XRT refined Analysis
  71. GRB 150711A: Fermi GBM detection
  72. Swift-XRT observations of GRB 150710A
  73. GRB 150702A: Fermi GBM detection
  74. GRB 150702A: Swift-XRT observations
  75. GRB 150702A: Fermi-LAT detection
  76. Fermi GBM Observations is no longer triggerin on V404 Cyg
  77. GRB 150622A: Swift-XRT afterglow detection
  78. GRB 150627A: Swift-XRT afterglow detection
  79. GRB 150627A: Fermi GBM observation
  80. GRB 150626B: Swift-XRT refined Analysis
  81. GRB 150627A: Fermi-LAT detection
  82. GRB 150626A: Swift-XRT refined Analysis
  83. GRB 150622A: Swift-XRT observations
  84. GRB 150616A: Swift-XRT refined Analysis
  85. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  86. GRB 150615A: Swift-XRT refined Analysis
  87. GRB 150608A: Swift-XRT follow-up observations
  88. GRB 150608A: Swift-XRT afterglow detection
  89. GRB 150607A: Swift-XRT refined Analysis
  90. GRB 150607A: Fermi GBM Detection
  91. Swift trigger 642453 is not an astrophysical source
  92. GRB 150530B: Swift-XRT observations
  93. GRB 150530A: Swift-XRT refined Analysis
  94. GRB 150530A: Fermi GBM observation
  95. GRB 150513A: Swift-XRT observations
  96. GRB 150527A: Swift-XRT refined Analysis
  97. GRB 150527A: Fermi GBM observation
  98. GRB 150523A Swift-XRT afterglow detection
  99. GRB 150523A: Fermi-LAT detection
  100. GRB 150523A: Fermi GBM detection

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Download all Circulars as a .tar.gz archive:
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