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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"

19662 results found.

  1. GRB 070318: Gemini + Magellan spectra
  2. GRB070318: Swift UVOT continuing observations
  3. GRB070318: Swift-XRT refined analysis
  4. GRB 070318: Swift/UVOT Continued Observations
  5. GRB 070318, Swift-BAT refined analysis
  6. GRB 070318: Swift detection of a burst with an optical afterglow
  7. GRB 070311: Late Central Engine Activity Optical Flare??
  8. VLA observation of GRB 070311
  9. GRB 070309: variability of the XRT afterglow candidate
  10. GRB 070311: Swift/UVOT Upper Limits
  11. GRB 070311: Swift-XRT refined analysis
  12. GRB070309: Swift/XRT possible afterglow detection
  13. GRB 070125: Chandra X-ray Confirmation of Jet Break
  14. GRB 070309: Swift/UVOT Upper Limits
  15. Swift UVOT Finding Charts for GRB 070309
  16. GRB 070125: X-ray light curve analysis
  17. VLA observation of GRB 070306
  18. GRB 070306: NOT observations
  19. GRB 070306 Swift/UVOT refined analysis
  20. GRB 070306, Swift-BAT refined analysis
  21. GRB 070306: XRT Team Refined Analysis
  22. GRB070306 - SDSS Pre-burst Observations
  23. GRB 070306: Swift detection of a burst
  24. GRB070227: Swift-XRT refined analysis
  25. GRB 070125, deep late-time optical observation
  26. VLA observation of GRB 070224
  27. GRB 070227: optical observations
  28. GRB 070223: Optical Observations
  29. GRB 070227: optical observations
  30. GRB 070227: Swift/UVOT Upper Limits
  31. GRB 070227: TAROT La Silla observatory optical observations
  32. GRB 070227, Swift-BAT refined analysis
  33. GRB070227: possible X-ray afterglow detection
  34. GRB 070227: Swift detection of a burst in ground analysis
  35. GRB 070224: Optical afterglow confirmation
  36. GRB 070224: Swift/UVOT Upper Limits
  37. GRB070224: Swift-XRT Astrometrically Corrected Position
  38. VLA observation of GRB 070223
  39. VLA observation of GRB 070220
  40. GRB070224: Magellan Imaging Observations
  41. GRB070224: Gemini Imaging Observations
  42. GRB 070224: SARA upper limit
  43. GRB070224: Swift-XRT Refined Analysis
  44. GRB 070224, Swift-BAT refined analysis
  45. GRB 070224: MASTER-Net refind analysis
  46. GRB 070224: MASTER-VWF-Kislovodsk observations
  47. GRB 070224: Swift detection of a burst
  48. GRB070223: Swift/UVOT refined analysis
  49. GRB 070223, Swift-BAT refined analysis
  50. GRB070223: MASTER-VWF-Kislovodsk observations
  51. GRB 070223: Swift-XRT Refined Analysis
  52. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  53. GRB 070223: MDM Observations
  54. GRB070223: Swift burst
  55. Konus-Wind and Konus-A observations of GRB 070220
  56. GRB 070220 Swift-BAT Refined Analysis
  57. Swift/UVOT refined analysis of GRB070220
  58. GRB 070209: Swift XRT refined analysis
  59. GRB 070220: Swift-XRT Refined Analysis
  60. GRB 070220: Swift detection of a burst
  61. GRB070219: MASTER-VWF-Kislovodsk observations
  62. GRB 070219: XRT Refined Analysis
  63. GRB 070219: Swift/UVOT Upper limits
  64. GRB 070219, Swift-BAT refined analysis
  65. GRB 070219: ROTSE-III Optical Limits
  66. GRB070219 - SDSS Pre-Burst Observations
  67. GRB 070219: Swift detection of a burst
  68. Swift-BAT trigger 260304 is NOT a burst or transient
  69. GRB 070209: Swift XRT analysis
  70. GRB 070208: MARGE Optical Observations
  71. IPN localization of very bright long hard GRB 070207
  72. IPN localization of very intense short GRB 070201
  73. GRB 070209, Swift-BAT refined analysis of the short hard burst
  74. GRB 070209: Swift detection of a short hard burst
  75. GRB 070208: Swift XRT refined analysis
  76. GRB 070208: RAPTOR detection of early afterglow onset
  77. GRB 070208: MDM Optical Decay
  78. GRB 070208, Swift-BAT refined analysis
  79. GRB070208: Faulkes Telescope North Afterglow Identification
  80. GRB 070208: ROTSE-III Optical Limits
  81. GRB 070208: MDM Observations
  82. GRB 070208: Swift detection of a burst
  83. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  84. GRB070124: Swift-XRT Follow-up Observation
  85. GRB070126: Swift-XRT Observation
  86. GRB 070129: Swift/UVOT Upper limits
  87. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  88. GRB061217: MAGIC telescope GeV observation
  89. GRB 070129, Swift-BAT refined analysis of a particularly long
  90. GRB 070129: Swift-XRT Refined Analysis
  91. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  92. GRB 070129: Swift detection of a burst
  93. GRB 070126: Swift/UVOT refined analysis
  94. GRB070126: Swift-XRT possible detection of an afterglow
  95. GRB 070125: UVOT Detection in Ultraviolet Filters
  96. GRB 070126, Swift-BAT refined analysis of a very faint burst
  97. GRB070124: Swift-XRT Observation
  98. Possible GRB 070126: Swift/UVOT Upper Limit
  99. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  100. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission

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