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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"

21815 results found.

  1. GRB 110411A: Enhanced Swift-XRT position
  2. GRB 110411A: MASTER optical observations
  3. GRB 110411A: Swift detection of a burst
  4. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  5. GRB 110328A / Swift J164449.3+573451: optical observations
  6. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  7. GRB 110407A: MASTER optical observations
  8. GRB110407A: UVOT Upper Limits
  9. GRB 110407A: GROND Detection of the Optical Afterglow
  10. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  11. GRB 110407A: NOT optical observations
  12. GRB 110407A: Enhanced Swift-XRT position
  13. IPN triangulation of the bright GRB110406A
  14. GRB 110407A: MASTER early optical observations
  15. GRB 110407A: Swift detection of a burst
  16. Konus-Wind observation of GRB 110406A
  17. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  18. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  19. GRB 110402A: fading optical afterglow
  20. GRB 110402A: Suzaku WAM observation of the prompt emission
  21. GRB 110328A / Swift J164449.3+573451, HST Observations
  22. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  23. GRB 110402A: optical observations in Mondy
  24. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  25. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  26. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  27. GRB 110402A: Swift/UVOT detection of afterglow candidate
  28. GRB 110402A: Spectral lag indicates short hard burst
  29. Konus-Wind observation of GRB 110402A
  30. GRB 110402A: Konkoly observations
  31. GRB 110328A: Konkoly observations.
  32. GRB 110402A: Swift-BAT refined analysis
  33. GRB 110402A: early optical limit by "Pi of the Sky"
  34. GRB 110402A: further NOT observations
  35. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  36. GRB 110402A: PAIRITEL NIR Upper Limits
  37. GRB 110402A: Enhanced Swift-XRT position
  38. GRB 110402A: NOT afterglow confirmation
  39. GRB 110402A: Swift detection of a burst
  40. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  41. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  42. GRB 110328/Swift J164449.3+573451: Fermi observations
  43. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  44. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  45. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  46. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  47. GRB 110328A / Swift J164449.3+573451: beamed emission
  48. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  49. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  50. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  51. GRB 110328A / Swift J164449.3+573451: optical observations
  52. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  53. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  54. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  55. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  56. GRB 110328A: Enhanced Swift-XRT position
  57. GRB 110328A: Swift detection of a burst
  58. GRB 110319B Swift-XRT afterglow confirmation
  59. GRB 110319B: Swift/UVOT Upper Limits
  60. GRB 110318B: Swift/UVOT Upper Limits
  61. GRB 110319B: GROND upper limits
  62. GRB 110319B: Swift-XRT afterglow candidate.
  63. GRB 110319B found in ground analysis of Swift-BAT data
  64. GRB 110319A: Swift/UVOT Detection
  65. GRB 110319A: Swift-BAT refined analysis
  66. GRB 110318B: GROND upper limits
  67. GRB 110319A: Enhanced Swift-XRT position
  68. GRB 110319A: Swift detection of a burst
  69. GRB 110318B: Swift-BAT refined analysis
  70. GRB 110318B: Enhanced Swift-XRT position
  71. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  72. GRB 110318B: Swift detection of a burst
  73. GRB 110315A: RTT150 optical observations
  74. GRB 110315A: Swift/UVOT Upper Limits
  75. GRB 110315A: Enhanced Swift-XRT position
  76. GRB 110315A: Swift detection of a burst
  77. GRB110312A: MITSuME Okayama Optical upper limits
  78. GRB 110312A: RTT150 optical observations
  79. GRB 110312A: Swift/UVOT Upper Limits
  80. GRB 110312A: GROND Upper Limits
  81. GRB 110312A: Enhanced Swift-XRT position
  82. GRB 110312A: Swift detection of a burst
  83. GRB 110305A: REM detection of a possible NIR afterglow
  84. GRB110305A: MITSuME Ishigakijima Optical upper limits
  85. GRB 110305A: Swift/UVOT Upper Limits
  86. GRB 110305A: Enhanced Swift-XRT position
  87. GRB 110305A: GROND Detection of Optical Afterglow
  88. GRB 110305A: Swift detection of a burst
  89. GRB 110223A: optical upper limits
  90. GRB 110301A: Fermi GBM detection
  91. GRB101225A: early EVLA Observations of Christmas Burst
  92. Swift/UVOT observations of GRB110223A
  93. No IPN GRB detected in conjunction with candidate GRB 110215
  94. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  95. Swift/UVOT observations of GRB110223b
  96. GRB 110223A : early optical limit by "Pi of the Sky"
  97. GRB 110223A: Enhanced Swift-XRT position
  98. GRB 110223B: Enhanced Swift-XRT position
  99. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  100. GRB 110223B: Swift detection of a burst

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