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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"

45815 results found.

  1. GRB 141031A: Swift-XRT refined Analysis
  2. GRB 141031A: Skynet PROMPT-CTIO Observations
  3. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  4. GRB 141031A: VLT/X-shooter optical observations
  5. GRB 141031A: Fermi GBM detection
  6. GRB 141031B: Nanshan optical upper limit
  7. GRB 141031B: MASTER early optical observations
  8. GRB 141031B: Swift detection of a burst
  9. GRB 141031A: Enhanced Swift-XRT position
  10. GRB 141031A: GROND detection of a possible optical afterglow candidate
  11. GRB 141031A: Swift detection of a burst
  12. GRB 141029A: Nanshan optical upper limit
  13. GRB 141028A: SAO RAS Zeiss-1000 photometry
  14. GRB 140509A: GROND afterglow detection
  15. GRB 141028A: Continued RATIR Observations
  16. GRB 141028A: Swift/UVOT followup observations
  17. GRB 141028A: P60 Observations and Decay Index
  18. IPN triangulation of GRB 141029B
  19. GRB 141029B: Fermi GBM detection
  20. GRB 141028A: Swift-XRT observations
  21. GRB 141028A: LCOGTN observations
  22. GRB 141029A Tiled Swift observations
  23. GRB 141028A: VLT/X-shooter redshift of z=2.33
  24. GRB141028A: Gemini-North redshift
  25. GRB 141029A: MAXI/GSC detection
  26. GRB 141028A: RATIR Optical and NIR Observations
  27. GRB 141028A: Swift/UVOT Detection
  28. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  29. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  30. GRB 141020A: Continued Mondy Observations, optical upper limit
  31. IPN triangulation of GRB 141028A
  32. GRB 141026A: IRAM 30m millimetre observations
  33. GRB 141028A Tiled Swift observations
  34. GRB 141028A: MASTER OT candidate detection
  35. GRB 141028A: Fermi GBM detection
  36. GRB 141026A: Continued RATIR Optical and NIR Observations
  37. GRB 141028A: Fermi-LAT detection
  38. GRB 141026A: GTC spectroscopy
  39. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  40. GRB 141026A: SAO RAS Zeiss-1000 observations
  41. GRB 141026A: Continued RATIR Optical and NIR Observations
  42. GRB 141026A: Swift/UVOT Upper Limits
  43. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  44. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  45. GRB 141026A: Swift-XRT refined Analysis
  46. GRB 141026A: Swift-BAT refined analysis
  47. Fermi Gamma-ray Burst Monitor trigger 141026452 is not a GRB
  48. GRB 141026A: MASTER early optical observations
  49. GRB 141026A: Enhanced Swift-XRT position
  50. GRB141026A: Deep P200 optical imaging
  51. GRB 141026A: 1.23m CAHA I-band observations
  52. GRB 141026A: GROND observations
  53. GRB 141026A: RATIR Optical Observations
  54. GRB 141026A: P60 early observations
  55. GRB 141026A: Swift detection of a burst
  56. Fermi Gamma-ray Burst Monitor trigger 141025734 is not a GRB
  57. GRB 141020A: AAO optical upper limit
  58. GRB 141020A: Khureltogot optical upper limit
  59. GRB141022A: Fermi GBM Detection
  60. GRB141022B: Fermi GBM Detection
  61. GRB 141022A: Swift/UVOT Upper Limits
  62. GRB 141020A: Mondy optical observations
  63. GRB 141022A: Swift-BAT refined analysis
  64. GRB 141022A: Swift-XRT refined Analysis
  65. GRB141015A iTelescope observation
  66. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  67. GRB 141022A: Swift detection of a burst
  68. GRB 141004A: RATIR Late Time Optical and NIR Observations
  69. GRB 141004A: La Palma late-time observations and possible brightening
  70. GRB 141020A: Swift-BAT refined analysis
  71. GRB 141020A: Swift-XRT refined Analysis
  72. GRB 141020A: 1.4 GHZ observation
  73. GRB 141020A: Swift/UVOT Detection
  74. GRB 141020A: Enhanced Swift-XRT position
  75. GRB 141020B: MAXI/GSC detection
  76. Konus-Wind observation of GRB 141017A
  77. GRB 141020A: Swift detection of a burst with an optical counterpart
  78. GRB 141017A, Swift-BAT refined analysis
  79. GRB 141017A: GROND Afterglow Confirmation
  80. GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
  81. GRB 141017A: Swift/UVOT Detection
  82. GRB 141015A: MITSuME Akeno upper limits
  83. GRB 141017A: Swift-XRT refined Analysis
  84. GRB 141017A: Enhanced Swift-XRT position
  85. GRB 141017A: Zadko observatory - Gingin optical observations
  86. GRB 141017A: Swift detection of a burst
  87. GRB 141015A: Swift/UVOT Upper Limits
  88. GRB 141015A: MITSuME Okayama upper limits
  89. GRB 141015A: Swift-BAT refined analysis
  90. GRB 141015A: LCO-McDonald observations
  91. GRB 141015A: RATIR Optical Upper Limits
  92. GRB 141015A: Enhanced Swift-XRT position
  93. GRB 141015A: Super-LOTIS early observations
  94. GRB 141015A: ISON-NM early optical observations
  95. GRB 141015A: Swift/XRT localization
  96. GRB 141015A: Swift detection of a burst
  97. Fermi Gamma-ray Burst Monitor trigger 141014781 is not a GRB
  98. Konus-Wind observation of GRB 141011A
  99. IPN Triangulation of GRB 141011A (short/hard)
  100. GRB 141011A: Fermi GBM detection

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