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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"

19663 results found.

  1. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  2. GRB 070318: Gemini + Magellan spectra
  3. GRB070318: Swift UVOT continuing observations
  4. GRB070318: Swift-XRT refined analysis
  5. GRB 070318: Swift/UVOT Continued Observations
  6. GRB 070318, Swift-BAT refined analysis
  7. GRB 070318: Swift detection of a burst with an optical afterglow
  8. GRB 070311: Late Central Engine Activity Optical Flare??
  9. VLA observation of GRB 070311
  10. GRB 070309: variability of the XRT afterglow candidate
  11. GRB 070311: Swift/UVOT Upper Limits
  12. GRB 070311: Swift-XRT refined analysis
  13. GRB070309: Swift/XRT possible afterglow detection
  14. GRB 070125: Chandra X-ray Confirmation of Jet Break
  15. GRB 070309: Swift/UVOT Upper Limits
  16. Swift UVOT Finding Charts for GRB 070309
  17. GRB 070125: X-ray light curve analysis
  18. VLA observation of GRB 070306
  19. GRB 070306: NOT observations
  20. GRB 070306 Swift/UVOT refined analysis
  21. GRB 070306, Swift-BAT refined analysis
  22. GRB 070306: XRT Team Refined Analysis
  23. GRB070306 - SDSS Pre-burst Observations
  24. GRB 070306: Swift detection of a burst
  25. GRB070227: Swift-XRT refined analysis
  26. GRB 070125, deep late-time optical observation
  27. VLA observation of GRB 070224
  28. GRB 070227: optical observations
  29. GRB 070223: Optical Observations
  30. GRB 070227: optical observations
  31. GRB 070227: Swift/UVOT Upper Limits
  32. GRB 070227: TAROT La Silla observatory optical observations
  33. GRB 070227, Swift-BAT refined analysis
  34. GRB070227: possible X-ray afterglow detection
  35. GRB 070227: Swift detection of a burst in ground analysis
  36. GRB 070224: Optical afterglow confirmation
  37. GRB 070224: Swift/UVOT Upper Limits
  38. GRB070224: Swift-XRT Astrometrically Corrected Position
  39. VLA observation of GRB 070223
  40. VLA observation of GRB 070220
  41. GRB070224: Magellan Imaging Observations
  42. GRB070224: Gemini Imaging Observations
  43. GRB 070224: SARA upper limit
  44. GRB070224: Swift-XRT Refined Analysis
  45. GRB 070224, Swift-BAT refined analysis
  46. GRB 070224: MASTER-Net refind analysis
  47. GRB 070224: MASTER-VWF-Kislovodsk observations
  48. GRB 070224: Swift detection of a burst
  49. GRB070223: Swift/UVOT refined analysis
  50. GRB 070223, Swift-BAT refined analysis
  51. GRB070223: MASTER-VWF-Kislovodsk observations
  52. GRB 070223: Swift-XRT Refined Analysis
  53. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  54. GRB 070223: MDM Observations
  55. GRB070223: Swift burst
  56. Konus-Wind and Konus-A observations of GRB 070220
  57. GRB 070220 Swift-BAT Refined Analysis
  58. Swift/UVOT refined analysis of GRB070220
  59. GRB 070209: Swift XRT refined analysis
  60. GRB 070220: Swift-XRT Refined Analysis
  61. GRB 070220: Swift detection of a burst
  62. GRB070219: MASTER-VWF-Kislovodsk observations
  63. GRB 070219: XRT Refined Analysis
  64. GRB 070219: Swift/UVOT Upper limits
  65. GRB 070219, Swift-BAT refined analysis
  66. GRB 070219: ROTSE-III Optical Limits
  67. GRB070219 - SDSS Pre-Burst Observations
  68. GRB 070219: Swift detection of a burst
  69. Swift-BAT trigger 260304 is NOT a burst or transient
  70. GRB 070209: Swift XRT analysis
  71. GRB 070208: MARGE Optical Observations
  72. IPN localization of very bright long hard GRB 070207
  73. IPN localization of very intense short GRB 070201
  74. GRB 070209, Swift-BAT refined analysis of the short hard burst
  75. GRB 070209: Swift detection of a short hard burst
  76. GRB 070208: Swift XRT refined analysis
  77. GRB 070208: RAPTOR detection of early afterglow onset
  78. GRB 070208: MDM Optical Decay
  79. GRB 070208, Swift-BAT refined analysis
  80. GRB070208: Faulkes Telescope North Afterglow Identification
  81. GRB 070208: ROTSE-III Optical Limits
  82. GRB 070208: MDM Observations
  83. GRB 070208: Swift detection of a burst
  84. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  85. GRB070124: Swift-XRT Follow-up Observation
  86. GRB070126: Swift-XRT Observation
  87. GRB 070129: Swift/UVOT Upper limits
  88. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  89. GRB061217: MAGIC telescope GeV observation
  90. GRB 070129, Swift-BAT refined analysis of a particularly long
  91. GRB 070129: Swift-XRT Refined Analysis
  92. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  93. GRB 070129: Swift detection of a burst
  94. GRB 070126: Swift/UVOT refined analysis
  95. GRB070126: Swift-XRT possible detection of an afterglow
  96. GRB 070125: UVOT Detection in Ultraviolet Filters
  97. GRB 070126, Swift-BAT refined analysis of a very faint burst
  98. GRB070124: Swift-XRT Observation
  99. Possible GRB 070126: Swift/UVOT Upper Limit
  100. GRB 070125: UVOT Observations of a Fading Optical Afterglow

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