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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"

28303 results found.

  1. GRB 161014A: TSHAO optical observations
  2. GRB 161011A: RATIR Optical and NIR Observations
  3. GRB 161014A: Swift-XRT and UVOT afterglow detection
  4. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  5. GRB 161014A: Swift detection of a burst
  6. GRB 161010A: Swift/UVOT Possible Detection
  7. GRB 161011A, Swift-BAT refined analysis
  8. GRB 161011A: TSHAO afterglow candidate
  9. GRB 161011A: Swift/UVOT Upper Limits
  10. GRB 161011A: Swift-XRT refined Analysis
  11. GRB 161011A: Enhanced Swift-XRT position
  12. GRB 161010A: Swift-XRT afterglow detection
  13. GRB 161011A: Swift detection of a burst
  14. GRB 161010A: a long GRB detected by INTEGRAL
  15. GRB 161007A: NOT optical observations
  16. GRB 161007A: AbAO optical observations
  17. GRB 161007A: Mondy optical observations
  18. GRB 161007A: Swift-BAT refined analysis
  19. GRB 161007A: Swift/UVOT Upper Limits
  20. GRB 161007A: Swift-XRT refined Analysis
  21. GRB 161007A: GTC observations
  22. GRB 161007A: Enhanced Swift-XRT position
  23. GRB 161004A: Maidanak optical observations
  24. GRB 161004A: refined analysis of TSHAO optical observations
  25. GRB 161007A: Swift detection of a burst
  26. GRB 160821A: Maisoncelles observatory optical observations
  27. GRB 160925A: Kottamia R-band observation
  28. GRB 160927A: GTC observations
  29. GRB 161004A: Swift-BAT refined analysis
  30. GRB 150302A: late-time imaging and optical afterglow confirmation
  31. GRB 161001A: IRSF upper limits
  32. GRB 161004B: Fermi GBM detection
  33. GRB 161004B: Swift/UVOT Upper Limits
  34. GRB 161004B: Swift-BAT refined analysis
  35. GRB 161004B: Swift-XRT refined Analysis
  36. GRB 161004A: RATIR Optical and NIR Observations
  37. GRB 161004B: Enhanced Swift-XRT position
  38. GRB 161004B: Swift detection of a burst
  39. GRB 161004A: SAO RAS optical upper limit
  40. GRB 161004A: Swift-XRT refined Analysis
  41. GRB 161004A: Swift/UVOT Detection
  42. GRB 161004A: Enhanced Swift-XRT position
  43. Swift Trigger 715209 is not an astrophysical event
  44. GRB 161004A: Bassano Bresciano Observatory upper limit
  45. GRB 161004A: TSHAO optical observations
  46. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  47. GRB 160927A: 15 GHz upper limits from AMI
  48. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  49. GRB 161001A: GROND afterglow candidate
  50. GRB 161001A, Swift-BAT refined analysis (likely a short GRB)
  51. GRB 161001A: Fermi GBM detection
  52. GRB 161001A: Swift-XRT refined Analysis
  53. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  54. GRB 161001A: Swift/UVOT Upper Limits
  55. GRB 161001A: Enhanced Swift-XRT position
  56. GRB 161001A: Swift detection of a burst
  57. GRB 160927A: Magellan imaging
  58. GRB 160927A: Swift/UVOT Upper Limits
  59. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  60. GRB 160927A: Swift-BAT refined analysis
  61. GRB 160927A: NOT optical observations
  62. GRB 160927A: GROND Observations
  63. GRB 160927A: Swift-XRT refined Analysis
  64. GRB 160927A: Enhanced Swift-XRT position
  65. GRB 160927A: TNG optical afterglow confirmation
  66. GRB 160927A: RTT150 optical afterglow candidate
  67. GRB 160927A: Swift detection of a short hard burst
  68. XRT refined analysis for GRB 160925A
  69. GRB 160925A/MASTER optical transient: Mondy optical observations
  70. GRB 160925A: MITSuME Akeno Optical Observations
  71. GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN
  72. GRB 160917A: Mondy afterglow confirmation
  73. GRB 160910A: TSHAO optical observations
  74. GRB 160917A: Swift-BAT refined analysis
  75. GRB 160917A: RATIR Optical and NIR Observations
  76. GRB 160917A: Fermi GBM observation
  77. GRB 160917A: Swift/UVOT Detection
  78. GRB 160917A: Swift-XRT refined Analysis
  79. GRB 160917A: Mondy optical observations
  80. GRB 160917A: OSN I-band upper limits
  81. GRB 160917A: Enhanced Swift-XRT position
  82. GRB 160917A: Swift detection of a burst
  83. GRB 160912A, Swift-BAT refined analysis
  84. GRB 160910A: Swift/UVOT Detection
  85. GRB 160912A: RATIR Optical and NIR Observations
  86. GRB 160912A: Swift/UVOT Weak Afterglow Detection
  87. GRB 160912A: Mondy optical observations
  88. GRB 160910A: Mondy optical observations
  89. GRB 160912A Liverpool Telescope optical afterglow
  90. GRB 160912A: Swift-XRT refined Analysis
  91. GRB 160912A: Fermi GBM detection
  92. GRB 160912A: Enhanced Swift-XRT position
  93. GRB 160910A: Global MASTER Net OT detection before LAT alert
  94. GRB 160912A: Swift detection of a burst
  95. GRB 160910A: Correction to GCN 19904
  96. GRB 160910A: XRT results and corrections to GCN 19905 & 19906
  97. GRB 160910A: NOT afterglow confirmation
  98. GRB 160910A: Afterglow detection from OSN
  99. GRB 160910A: Swift-XRT afterglow detection
  100. GRB 160910A: Fermi-LAT detection

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