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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36180 results found.

  1. GRB 110420A Swift/UVOT Observations
  2. GRB 110420B: Swift-XRT afterglow candidate
  3. GRB 110420B: Swift-BAT refined analysis
  4. GRB 110420A: Swift-BAT refined analysis
  5. GRB 110420B: Swift detection of a short hard burst
  6. GRB 110420A: Swift-XRT refined Analysis
  7. GRB 110420A: Enhanced Swift-XRT position
  8. GRB 110420A: Swift detection of a burst with optical counterpart
  9. GRB110414A: MITSuME Ishigakijima Optical upper limits
  10. GRB 110414A: GROND upper limits
  11. GRB110414A: MITSuME Okayama Optical upper limits
  12. GRB 110414A: Swift-BAT Refined Analysis
  13. GRB 110414A: Swift/UVOT Upper limits
  14. GRB 110414A: Swift-XRT refined Analysis
  15. GRB 110414A: Enhanced Swift-XRT position
  16. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  17. GRB 110414A : Faulkes Telescope North observations
  18. GRB 110414A: Swift detection of a burst
  19. GRB 110411A: PAIRITEL NIR Upper Limits
  20. GRB 110412A: Swift-BAT refined analysis
  21. GRB 110411A: optical limits from OSN
  22. GRB 110411A: Swift-XRT refined Analysis
  23. GRB 110412A: Fermi GBM observation
  24. GRB 110411A: Swift/UVOT Upper Limits
  25. GRB 110411A: MASTER prompt and follow-up optical limits
  26. GRB 110411A : Xinglong TNT OT candidate
  27. GRB 110412A: Swift detection of a burst
  28. GRB 110411A, Swift-BAT refined analysis
  29. GRB 110411A: Enhanced Swift-XRT position
  30. GRB 110411A: MASTER optical observations
  31. GRB 110411A: Swift detection of a burst
  32. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  33. GRB 110407A: Swift-XRT refined Analysis
  34. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  35. GRB 110407A:VLF observations on 20.27kHz
  36. GRB 110328A / Swift J164449.3+573451: optical observations
  37. GRB 110407A: SMARTS optical limit
  38. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  39. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  40. GRB 110406A: Positional coincidence with NGC 404
  41. GRB 110407A: MASTER optical observations
  42. GRB110407A: UVOT Upper Limits
  43. GRB 110407A: GROND Detection of the Optical Afterglow
  44. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  45. GRB 110407A: NOT optical observations
  46. GRB 110407A: Enhanced Swift-XRT position
  47. GRB 110407A: Swift-BAT refined analysis
  48. GRB 100407A : Errata of afterglow position in GCN 11899
  49. IPN triangulation of the bright GRB110406A
  50. GRB 110407A : Lulin optical afterglow detection
  51. GRB 110407A : Xinglong TNT upper limit
  52. GRB 110407A: MASTER early optical observations
  53. GRB 110407A: Prompt enhanced Swift-XRT position
  54. GRB 110407A: Swift detection of a burst
  55. Konus-Wind observation of GRB 110406A
  56. Redshift of GRB 110402A theoretically estimated (revised)
  57. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  58. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  59. GRB 110402A: fading optical afterglow
  60. Redshift of GRB 110402A theoretically estimated
  61. GRB 110402A: Suzaku WAM observation of the prompt emission
  62. GRB 110328/Swift J164449.3+573451: Chandra observations
  63. GRB 110402A: LOAO Optical Observation
  64. Comparison of ICSP VLF observation of GRB 090424 with satellite observations
  65. GRB 110328A / Swift J164449.3+573451: Keck LRIS R-band photometry
  66. GRB 110328A / Swift J164449.3+573451, HST Observations
  67. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  68. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  69. GRB 110401A: Fermi GBM detection
  70. GRB 110402A: Fermi GBM detection
  71. GRB 110402A: optical observations in Mondy
  72. GRB 110402A afterglow observation
  73. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  74. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  75. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  76. GRB 110402A: Swift/UVOT detection of afterglow candidate
  77. GRB 110402A: Spectral lag indicates short hard burst
  78. Konus-Wind observation of GRB 110402A
  79. GRB 110402A: Konkoly observations
  80. GRB 110328A: Konkoly observations.
  81. GRB 110402A: Swift-BAT refined analysis
  82. GRB 110402A: Swift-XRT refined Analysis
  83. GRB 110402A: early optical limit by "Pi of the Sky"
  84. GRB 110402A: further NOT observations
  85. GRB 110402A: PAIRITEL NIR Upper Limits
  86. GRB 110402A: Enhanced Swift-XRT position
  87. GRB 110402A: NOT afterglow confirmation
  88. GRB 110402A: Liverpool Telescope Observations
  89. GRB 110402A: Swift detection of a burst
  90. GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
  91. GRB 110328A / Swift J164449.3+57345: Correction to GCN 11850
  92. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  93. GRB 110328A / Swift J164449.3+573451: Infrared transient
  94. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  95. GRB 110328/Swift J164449.3+573451: Fermi observations
  96. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  97. GRB 110328A / Swift J164449.3+573451
  98. GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
  99. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  100. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations

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