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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"

23614 results found.

  1. GRB 140320D: Suzaku WAM observation of the prompt emission
  2. GRB 140226A/iPTF14yb: Mondy optical observations
  3. GRB 140320C: Mondy optical observations and afterglow confirmation
  4. GRB 140323A: Fermi-LAT detection
  5. GRB 140323A: BOOTES-3 optical upper limit.
  6. GRB 140323A: Swift/UVOT Upper Limits
  7. GRB 140323A: Enhanced Swift-XRT position
  8. GRB 140323A: Swift detection of a burst
  9. GRB 140320A: RATIR Optical and NIR Observations
  10. IPN Triangulation of very intense GRB 140320D
  11. GRB 140320C: Mini-GWAC prompt observation
  12. GRB 140320C: Swift/UVOT Upper Limits
  13. GRB 140320B: Swift/UVOT Upper Limits
  14. GRB 140320A: Swift/UVOT Upper Limits
  15. GRB 140320C: Swift-XRT observations
  16. GRB 140320A: Confirmation of a fading X-ray afterglow
  17. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  18. GRB 140320B: Swift-XRT detection of the afterglow
  19. GRB 140320C: Mondy optical observations
  20. GRB 140320A: Enhanced Swift-XRT position
  21. GRB 140320A: Swift-XRT detection of an afterglow candidate
  22. GRB 140320C: A long GRB detected by INTEGRAL
  23. GRB 140320B: ISON-NM optical observations
  24. Swift Trigger 592558 is not an astrophysical source
  25. GRB 140320A: Swift detection of a burst
  26. GRB 140318A: Continued RATIR Optical and NIR Observations
  27. GRB 140318A: Mondy optical limit
  28. GRB 140318A: Swift/UVOT Upper Limits
  29. GRB 140311B: Mondy optical limit
  30. GRB 140311A: Mondy optical limits
  31. GRB 140318A: Enhanced Swift-XRT position
  32. GRB 140318A: RATIR Optical and NIR Detections
  33. GRB140318A: Discovery Channel Telescope Optical Detection
  34. GRB 140318A: NOT detection of the afterglow
  35. GRB 140318A: Swift detection of a burst
  36. GRB140308A: Suzaku WAM observation of the prompt emission
  37. GRB 140311C: MASTER optical observations
  38. GRB 140311C: Swift-XRT and UVOT observations
  39. GRB 140311C: MASTER before, during and after trigger optical observations
  40. GRB 140311B: Swift-BAT refined analysis
  41. GRB 140311A: RATIR Optical and NIR Detection
  42. GRB 140311C: Fermi GBM Detection
  43. GRB 140311A: Montarrenti Observatory optical upper limit
  44. GRB 140311B: Fermi GBM Detection
  45. GRB 140311A: Swift/UVOT Upper Limits
  46. GRB 140311B: Swift/UVOT Upper Limits
  47. GRB 140311B: RATIR Optical and NIR Observations
  48. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  49. GRB 140311A: Swift-XRT refined Analysis
  50. GRB 140302A: GROND confirmation of the afterglow
  51. GRB 140311B: final MASTER OT light curve
  52. GRB 140311A: Enhanced Swift-XRT position
  53. GRB 140311B: Enhanced Swift-XRT position
  54. GRB 140311B: TAROT Calern observatory optical observations
  55. GRB 140311A: NOT observations of the optical afterglow
  56. GRB 140311A: Zadko observatory - Gingin optical observations
  57. GRB 140311B: Swift-XRT observations
  58. GRB 140311B: Nanshan afterglow detection
  59. GRB 140311B: Swift detection of a burst
  60. GRB 140311A: Swift detection of a probable burst
  61. GRB 140304A: Suzaku WAM observation of the prompt emission
  62. IPN Triangulation of GRB 140308A
  63. IPN Triangulation of GRB 140306A
  64. GRB 140304A: Continued RATIR Optical and NIR Observations
  65. GRB 140306A: Fermi GBM detection
  66. Trigger 590503: Swift-BAT triggered on noise
  67. GRB 140305A: Swift detection of a burst
  68. GRB 140304A: RATIR g-band Dropout
  69. GRB 140304A: Enhanced Swift-XRT position
  70. GRB 140304A: NOT observations and redshift estimate
  71. GRB 140304A: Swift/UVOT Upper Limits
  72. iPTF14yb: JVLA and CARMA observations
  73. GRB 140304A: Khureltogot optical observations
  74. GRB 140304A: Mondy optical observations
  75. GRB 140304A: Afterglow decay from Nanshan observations
  76. GRB 140304A: Swift detection of a burst
  77. GRB 140301A: Swift/UVOT Upper Limits
  78. GRB 140302A: Swift/UVOT Upper Limits
  79. GRB 140302A: MITSuME Okayama upper limits
  80. GRB140302A: Fermi GBM detection
  81. GRB 140302A: Enhanced Swift-XRT position
  82. GRB 140301A: Swift-XRT refined Analysis
  83. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  84. GRB 140302A: GROND afterglow candidate
  85. GRB 140302A: Swift detection of a burst
  86. GRB 140301A: NOT afterglow candidate
  87. GRB 140301A: Enhanced Swift-XRT position
  88. GRB 140301A: Skynet R-COP Observations
  89. GRB 140301A: Swift detection of a burst
  90. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  91. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  92. GRB 140226A/iPTF14yb: Mondy optical observations
  93. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  94. GRB 140219A: Mondy optical observations of XRT source #5
  95. Konus-Wind observation of GRB 140226A
  96. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb
  97. PTF14yb: GROND Transient Detection
  98. iPTF14yb: RATIR Optical and NIR Observations of the optical transient
  99. GRB 140219A: Suzaku WAM observation of the prompt emission
  100. iPTF14yb: Swift-XRT detection

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