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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"

23585 results found.

  1. GRB 110422A: Swift detection of a burst
  2. GRB 110420B: Swift/UVOT Upper Limits
  3. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  4. GRB 110420B: Swift-XRT afterglow candidate retraction
  5. GRB 110420B, GROND observations
  6. GRB 110420A Swift/UVOT Observations
  7. GRB 110420B: Swift-XRT afterglow candidate
  8. GRB 110420B: Swift detection of a short hard burst
  9. GRB 110420A: Enhanced Swift-XRT position
  10. GRB 110420A: Swift detection of a burst with optical counterpart
  11. GRB110414A: MITSuME Ishigakijima Optical upper limits
  12. GRB 110414A: GROND upper limits
  13. GRB110414A: MITSuME Okayama Optical upper limits
  14. GRB 110414A: Swift/UVOT Upper limits
  15. GRB 110414A: Enhanced Swift-XRT position
  16. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  17. GRB 110414A: Swift detection of a burst
  18. GRB 110411A: PAIRITEL NIR Upper Limits
  19. GRB 110411A: Swift/UVOT Upper Limits
  20. GRB 110412A: Swift detection of a burst
  21. GRB 110411A: Enhanced Swift-XRT position
  22. GRB 110411A: Swift detection of a burst
  23. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  24. GRB 110407A:VLF observations on 20.27kHz
  25. GRB 110328A / Swift J164449.3+573451: optical observations
  26. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  27. GRB 110406A: Positional coincidence with NGC 404
  28. GRB 110407A: MASTER optical observations
  29. GRB110407A: UVOT Upper Limits
  30. GRB 110407A: GROND Detection of the Optical Afterglow
  31. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  32. GRB 110407A: NOT optical observations
  33. GRB 110407A: Enhanced Swift-XRT position
  34. IPN triangulation of the bright GRB110406A
  35. GRB 110407A : Xinglong TNT upper limit
  36. GRB 110407A: Swift detection of a burst
  37. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  38. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  39. GRB 110402A: fading optical afterglow
  40. GRB 110402A: LOAO Optical Observation
  41. GRB 110328A / Swift J164449.3+573451, HST Observations
  42. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  43. GRB 110401A: Fermi GBM detection
  44. GRB 110402A: optical observations in Mondy
  45. GRB 110402A afterglow observation
  46. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  47. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  48. GRB 110402A: Swift/UVOT detection of afterglow candidate
  49. GRB 110402A: Konkoly observations
  50. GRB 110328A: Konkoly observations.
  51. GRB 110402A: early optical limit by "Pi of the Sky"
  52. GRB 110402A: further NOT observations
  53. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  54. GRB 110402A: PAIRITEL NIR Upper Limits
  55. GRB 110402A: Enhanced Swift-XRT position
  56. GRB 110402A: NOT afterglow confirmation
  57. GRB 110402A: Swift detection of a burst
  58. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  59. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  60. GRB 110328/Swift J164449.3+573451: Fermi observations
  61. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  62. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  63. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  64. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  65. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  66. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  67. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  68. GRB 110328A / Swift J164449.3+573451: optical observations
  69. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  70. GRB 110328B: Fermi GBM detection
  71. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  72. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  73. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  74. GRB 110328A: Enhanced Swift-XRT position
  75. GRB 110328A: Swift detection of a burst
  76. GRB110318B : MOA optical upper limit
  77. GRB 110319B Swift-XRT afterglow confirmation
  78. GRB 110319B BAT refined analysis
  79. GRB 110319B: Swift/UVOT Upper Limits
  80. GRB 110318B: Swift/UVOT Upper Limits
  81. GRB 110319B: GROND upper limits
  82. GRB 110319B: Swift-XRT afterglow candidate.
  83. GRB 110319B found in ground analysis of Swift-BAT data
  84. GRB 110319A: Swift/UVOT Detection
  85. GRB 110318B: GROND upper limits
  86. GRB 110319A: Enhanced Swift-XRT position
  87. GRB 110319A: Swift detection of a burst
  88. GRB 110318B: Enhanced Swift-XRT position
  89. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  90. GRB 110318B: Swift detection of a burst
  91. GRB 110318A: Swift detection of a burst
  92. GRB 110315A: RTT150 optical observations
  93. GRB 110315A: Swift/UVOT Upper Limits
  94. GRB 110315A: Swift-BAT refined analysis
  95. GRB 110315A: Enhanced Swift-XRT position
  96. GRB 110315A: MASTER early optical observations
  97. GRB 110315A: Swift detection of a burst
  98. GRB110312A: MITSuME Okayama Optical upper limits
  99. GRB 110312A: RTT150 optical observations
  100. GRB 110312A: Swift/UVOT Upper Limits

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