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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"

43892 results found.

  1. GRB161014A: NOT optical observations
  2. GRB 161014A: GTC spectroscopy
  3. GRB 161014A: TSHAO optical observations
  4. GRB 161011A: RATIR Optical and NIR Observations
  5. GRB 161014A: Swift-XRT and UVOT afterglow detection
  6. GRB 161014A : Xinglong TNT optical observation
  7. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  8. GRB 161014A: MITSuME-Akeno optical observation
  9. GRB 161014A: Swift detection of a burst
  10. GRB 161010A: Swift/UVOT Possible Detection
  11. GRB 161010A: CALET Gamma-Ray Burst Monitor detection
  12. GRB 161011A, Swift-BAT refined analysis
  13. GRB 161011A: Swift burst of interest
  14. GRB 161011A: TSHAO afterglow candidate
  15. GRB 161011A: Swift-XRT refined Analysis
  16. Konus-Wind observation of GRB 161010A
  17. GRB 161011A: Enhanced Swift-XRT position
  18. GRB 161010A: Swift-XRT afterglow detection
  19. GRB 161011A: Prompt enhanced Swift-XRT position
  20. GRB 161011A: Swift detection of a burst
  21. GRB 161010A: Swift ToO observations
  22. GRB 161010A: a long GRB detected by INTEGRAL
  23. GRB 161007A: NOT optical observations
  24. GRB 161007A: AbAO optical observations
  25. GRB 161007A: Mondy optical observations
  26. GRB 161007A: Swift-BAT refined analysis
  27. GRB 161007A: Swift-XRT refined Analysis
  28. GRB 161007A: GTC observations
  29. GRB 161007A: Enhanced Swift-XRT position
  30. GRB 161004A: Maidanak optical observations
  31. GRB 161004A: refined analysis of TSHAO optical observations
  32. GRB 161007A: Prompt enhanced Swift-XRT position
  33. GRB 161007A: MASTER-net early optical observations
  34. GRB 161007A: Swift detection of a burst
  35. GRB 160925A: Kottamia R-band observation
  36. Konus-Wind observation of GRB 161004B
  37. GRB 160927A: GTC observations
  38. GRB 161004B: CALET Gamma-Ray Burst Monitor detection
  39. GRB 160927A: CALET Gamma-Ray Burst Monitor ground detection
  40. GRB 161004A: Swift-BAT refined analysis
  41. GRB 150302A: late-time imaging and optical afterglow confirmation
  42. GRB 161001A: IRSF upper limits
  43. GRB 161004B: Fermi GBM detection
  44. GRB 161004B: Swift/UVOT Upper Limits
  45. GRB161004B: AstroSat CZTI detection
  46. GRB 161004B: Swift-BAT refined analysis
  47. GRB 161004B: Swift-XRT refined Analysis
  48. GRB 161004A: RATIR Optical and NIR Observations
  49. GRB 161004B: Enhanced Swift-XRT position
  50. GRB 161004B: Prompt enhanced Swift-XRT position
  51. GRB 161004B: Swift detection of a burst
  52. GRB 161004A: SAO RAS optical upper limit
  53. GRB 161004A: Swift-XRT refined Analysis
  54. GRB 161004A: Swift/UVOT Detection
  55. GRB 161004A: Enhanced Swift-XRT position
  56. Swift Trigger 715209 is not an astrophysical event
  57. GRB 161004A: Bassano Bresciano Observatory upper limit
  58. GRB 161004A: TSHAO optical observations
  59. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  60. GRB 160927A: 15 GHz upper limits from AMI
  61. Konus-Wind observation of GRB 161001A (short/hard ?)
  62. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  63. GRB 161001A: GROND afterglow candidate
  64. GRB 161001A, Swift-BAT refined analysis (likely a short GRB)
  65. GRB 161001A: Fermi GBM detection
  66. GRB 161001A: Swift-XRT refined Analysis
  67. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  68. GRB 161001A: Enhanced Swift-XRT position
  69. GRB 161001A: Prompt enhanced Swift-XRT position
  70. GRB 161001A: Swift detection of a burst
  71. Possible radio detection of GRB 160910A with the GMRT
  72. Fermi GBM trigger 496791348/160928900 is not a GRB
  73. GRB 160927A: Magellan imaging
  74. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  75. GRB 160927A: Swift-BAT refined analysis
  76. GRB 160927A: NOT optical observations
  77. GRB 160927A: GROND Observations
  78. GRB 160927A: Swift-XRT refined Analysis
  79. GRB 160927A: Enhanced Swift-XRT position
  80. GRB 160927A: TNG optical afterglow confirmation
  81. GRB160927A: D50 optical limit
  82. GRB 160927A: RTT150 optical afterglow candidate
  83. GRB 160927A: Prompt enhanced Swift-XRT position
  84. GRB 160927A: Swift detection of a short hard burst
  85. GRB 160917A: 15 GHz upper limits from AMI
  86. GRB 160912A: 15 GHz upper limits from AMI
  87. GRB160910A: AstroSat CZTI detection
  88. XRT refined analysis for GRB 160925A
  89. GRB 160925A/MASTER optical transient: Mondy optical observations
  90. GRB 160925A: Bassano Bresciano Photometry of MASTER optical transient
  91. GRB 160925A: Optical spectroscopy of MASTER optical transient
  92. GRB160824B: AstroSat CZTI detection
  93. GRB160917A: AstroSat CZTI detection
  94. GRB 160925A / Fermi 496473540: MASTER OT observations
  95. GRB 160925A: Swift ToO observations
  96. GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN
  97. GRB 160925A / Fermi 496473540: Global MASTER Net OT discovery
  98. GRB 160910A: 15 GHz detection from AMI
  99. GRB 160917A: Mondy afterglow confirmation
  100. GRB 160910A: TSHAO optical observations

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