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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"

45780 results found.

  1. GRB 141121A: Swift-BAT refined analysis
  2. GRB 141121A: LCO-FTN observations
  3. GRB 141121A: Keck redshift
  4. GRB 141121A: Enhanced Swift-XRT position
  5. GRB 141118A: iPTF Optical Observations
  6. GRB 141121A: GROND Afterglow candidate
  7. GRB 141121A: MAXI/GSC detection
  8. GRB141121A: BOOTES-2/TELMA upper limit
  9. GRB 141121A: Swift detection of a burst
  10. Konus-Wind observation of GRB 141118A
  11. IPN Triangulation of GRB 141118A
  12. GRB 141109A: further VLA observations
  13. GRB 141104A: further Swift-XRT observations and afterglow candidate
  14. GRB 141109A: VLA detection
  15. Swift Trigger 618673: probable noise event
  16. Trigger 618634: Swift detection of Vela X-1
  17. GRB 141109B: optical upper limits
  18. GRB 141015A: TAROT La Silla observatory optical observations
  19. GRB 141022A: TAROT La Silla observatory optical observations
  20. GRB 141031A: TAROT La Silla observatory optical observations
  21. GRB 141109A: TAROT La Silla observatory optical observations
  22. GRB 141109A: AAO optical observations
  23. Swift Trigger 618402: probable noise event
  24. Swift Trigger 618391 is not an astrophysical event
  25. GRB 141109A: Terskol photometry
  26. GRB 141109B: Swift/UVOT Upper Limits
  27. GRB 141109A: Swift/UVOT Detection
  28. GRB 141109A: NOT r-band observation
  29. Konus-Wind observation of GRB 141109A
  30. GRB 141109B: MITSuME Akeno upper limits
  31. GRB141109A : Xinglong TNT optical observation
  32. GRB 141109B: IRAM 30m millimetre observations
  33. GRB 141109B: Swift-XRT refined Analysis
  34. Swift Trigger 618134 is not an astrophysical event
  35. GRB 141109A: MITSuME Ishigakijima upper limits
  36. GRB 141109A: Swift-XRT refined Analysis
  37. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  38. GRB 141109B: Swift-BAT refined analysis
  39. GRB 141109B: Enhanced Swift-XRT position
  40. GRB 141109A: Swift-BAT refined analysis
  41. GRB 141109A: Enhanced Swift-XRT position
  42. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  43. GRB 141109A: GROND afterglow observation
  44. X-shooter redshift of GRB 141109A
  45. GRB 141109A: REM NIR candidate afterglow
  46. GRB 141109B: Swift detection of a burst
  47. GRB 141109A: Swift detection of a burst
  48. GRB 141104A: Swift-XRT observations
  49. GRB 141028A: Mondy optical observations
  50. GRB 141104A Tiled Swift observations
  51. GRB 141026A: CrAO optical observation
  52. GRB
  53. GRB 141026A: Gemini-North optical and NIR imaging
  54. GRB 141028A: TShAO optical observation
  55. GRB 141031B: TShAO optical observations
  56. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  57. Konus-Wind observation of GRB 141104A
  58. IPN Triangulation of GRB 141104A (long/very bright)
  59. GRB 141102A possible precursor was another, known source
  60. Konus-Wind observation of GRB 141102A
  61. GRB 141022A: Skynet PROMPT-CTIO Observations
  62. GRB 141102A: Fermi-LAT detection
  63. GRB 141102A: Fermi GBM detection
  64. GRB 141102A found in ground analysis of BAT data
  65. GRB 141026A: VLA observations
  66. GRB 141031B: RATIR Optical and NIR Observation
  67. GRB 141031B: Swift/UVOT Upper Limits
  68. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  69. GRB 141031B: Swift-XRT refined Analysis
  70. GRB 141031B: Bassano Bresciano Observatory upper limit
  71. GRB 141031B: NOT optical observations
  72. GRB 141031B: MITSuME Ishigakijima upper limits
  73. GRB 141031B: Swift-BAT refined analysis
  74. GRB 141031A, Swift-BAT refined analysis
  75. GRB 141031B: Enhanced Swift-XRT position
  76. GRB 141031A: Swift/UVOT Upper Limits
  77. GRB 141031B: TShAO optical upper limit
  78. GRB 141031B: 1.23m CAHA I-band observations
  79. GRB 141031A: Swift-XRT refined Analysis
  80. GRB 141031A: Skynet PROMPT-CTIO Observations
  81. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  82. GRB 141031A: VLT/X-shooter optical observations
  83. GRB 141031A: Fermi GBM detection
  84. GRB 141031B: Nanshan optical upper limit
  85. GRB 141031B: MASTER early optical observations
  86. GRB 141031B: Swift detection of a burst
  87. GRB 141031A: Enhanced Swift-XRT position
  88. GRB 141031A: GROND detection of a possible optical afterglow candidate
  89. GRB 141031A: Swift detection of a burst
  90. GRB 141029A: Nanshan optical upper limit
  91. GRB 141028A: SAO RAS Zeiss-1000 photometry
  92. GRB 140509A: GROND afterglow detection
  93. GRB 141028A: Continued RATIR Observations
  94. GRB 141028A: Swift/UVOT followup observations
  95. GRB 141028A: P60 Observations and Decay Index
  96. IPN triangulation of GRB 141029B
  97. GRB 141029B: Fermi GBM detection
  98. GRB 141028A: Swift-XRT observations
  99. GRB 141028A: LCOGTN observations
  100. GRB 141029A Tiled Swift observations

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