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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"

28239 results found.

  1. GRB 070125: Chandra X-ray Confirmation of Jet Break
  2. GRB 070309: Swift/UVOT Upper Limits
  3. GRB 070306, optical observation
  4. Swift UVOT Finding Charts for GRB 070309
  5. GRB 070309: A long GRB detected by INTEGRAL
  6. GRB 070125: X-ray light curve analysis
  7. VLA observation of GRB 070306
  8. GRB 070306: NOT observations
  9. GRB 070306 Swift/UVOT refined analysis
  10. GRB 070306: IR observations and candidate afterglow
  11. GRB 070306, Swift-BAT refined analysis
  12. GRB 070306: XRT Team Refined Analysis
  13. GRB 070306: Optical and IR observations with KANATA
  14. GRB070306 - SDSS Pre-burst Observations
  15. GRB 070306: Swift detection of a burst
  16. GRB070227: Swift-XRT refined analysis
  17. GRB 060605 new redshift
  18. GRB 070125, deep late-time optical observation
  19. VLA observation of GRB 070224
  20. GRB 070227: Swift/UVOT Upper Limits
  21. GRB 070227: TAROT La Silla observatory optical observations
  22. GRB 070227, Swift-BAT refined analysis
  23. GRB 070227: Swift detection of a burst in ground analysis
  24. GRB 070224: Swift/UVOT Upper Limits
  25. VLA observation of GRB 070223
  26. VLA observation of GRB 070220
  27. GRB070224: Magellan Imaging Observations
  28. GRB 070224: WHT K-band imaging
  29. GRB 070224: MDM Observations
  30. GRB070224: Gemini Imaging Observations
  31. GRB 070224: SARA upper limit
  32. GRB070224: Swift-XRT Refined Analysis
  33. GRB 070224: optical afterglow candidate
  34. GRB 070224, Swift-BAT refined analysis
  35. GRB 070224: MASTER-Net refind analysis
  36. GRB 070224: MASTER-VWF-Kislovodsk observations
  37. GRB 070224: Swift detection of a burst
  38. GRB 070223: Optical observations
  39. GRB070223: Swift/UVOT refined analysis
  40. GRB 070223: Optical-IR observation with KANATA
  41. GRB 070223, Swift-BAT refined analysis
  42. GRB070223: MASTER-VWF-Kislovodsk observations
  43. GRB 070223: Swift-XRT Refined Analysis
  44. GRB070223 - SDSS Pre-Burst Observations
  45. GRB 070223: MDM Observations
  46. GRB070223: Swift burst
  47. GRB 070220: MITSuME Okayama Optical Observation
  48. GRB 070220 Swift-BAT Refined Analysis
  49. Swift/UVOT refined analysis of GRB070220
  50. GRB 070209: Swift XRT refined analysis
  51. GRB 070220: Swift-XRT Refined Analysis
  52. GRB 070220: Observation with the KANATA 1.5m telescope
  53. GRB 070219: Gemini Observations
  54. GRB 070220: Swift detection of a burst
  55. GRB070219: MASTER-VWF-Kislovodsk observations
  56. GRB 070219: Swift/UVOT Upper limits
  57. GRB 070219: I-band observations
  58. GRB 070219, Swift-BAT refined analysis
  59. GRB 070219: optical TNG observations
  60. GRB070219 - SDSS Pre-Burst Observations
  61. GRB 070219: Swift detection of a burst
  62. GRB 070125 observations with the GMRT
  63. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  64. GRB 070129: MDM I-band Detection
  65. GRB 070125: Break in Optical Decay
  66. GRB 070209: Swift XRT analysis
  67. GRB 070201: clarification on localization and Konus-Wind spectra
  68. IPN localization of very bright long hard GRB 070207
  69. GRB 070209, Swift-BAT refined analysis of the short hard burst
  70. GRB 070208: Swift XRT refined analysis
  71. GRB 070208, Swift-BAT refined analysis
  72. GRB070208 - SDSS Pre-Burst Observations
  73. GRB 070208: Early IR detection and afterglow astrometry
  74. GRB 070208: Swift detection of a burst
  75. GRB 070125 detection with CARMA
  76. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  77. GRB 070129: afterglow confirmation
  78. GRB070126: Swift-XRT Observation
  79. GRB 070129: Swift/UVOT Upper limits
  80. GRB 070125: optical observation
  81. GRB 070129, Swift-BAT refined analysis of a particularly long
  82. GRB 070129: Xinglong TNT optical Upper Limit
  83. GRB 070129: Swift-XRT Refined Analysis
  84. GRB 070129: VLT observations
  85. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  86. GRB 070129: Swift detection of a burst
  87. GRB 070126: Swift/UVOT refined analysis
  88. GRB 070125: MITSuME Okayama optical observation
  89. GRB 070125: optical observations
  90. GRB 070126: VLT observations
  91. GRB 070124: Suzaku WAM observation of the prompt emissions
  92. GRB 070125: UVOT Detection in Ultraviolet Filters
  93. GRB 070126, Swift-BAT refined analysis of a very faint burst
  94. GRB070125: Optical observation by Kanata
  95. GRB070124: Swift-XRT Observation
  96. Possible GRB 070126: Swift/UVOT Upper Limit
  97. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  98. GRB 070125: Xinglong TNT optical observations
  99. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  100. GRB 070125: Lick 3m Spectroscopy

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