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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"

36196 results found.

  1. GRB 070306: XRT Team Refined Analysis
  2. GRB 070306: Optical and IR observations with KANATA
  3. GRB070306 - SDSS Pre-burst Observations
  4. GRB 070306: Swift detection of a burst
  5. GRB 070223: NIR observations at WHT
  6. GRB070227: Swift-XRT refined analysis
  7. GRB 060605 new redshift
  8. GRB 070125, deep late-time optical observation
  9. VLA observation of GRB 070224
  10. GRB 070227: optical observations
  11. GRB 070223: Optical Observations
  12. GRB 070227: optical observations
  13. GRB 070227: Swift/UVOT Upper Limits
  14. GRB 070227: TAROT La Silla observatory optical observations
  15. GRB 070227, Swift-BAT refined analysis
  16. GRB070227: possible X-ray afterglow detection
  17. GRB 070227: Swift detection of a burst in ground analysis
  18. GRB 920925C: optical afterglow candidate
  19. GRB 070224: Optical afterglow confirmation
  20. IBAS Alert n. 4144: not a GRB
  21. GRB 070224: Swift/UVOT Upper Limits
  22. VLA observation of GRB 070223
  23. VLA observation of GRB 070220
  24. GRB070224: Magellan Imaging Observations
  25. GRB 070224: WHT K-band imaging
  26. GRB 070224: MDM Observations
  27. GRB 070224: SARA upper limit
  28. GRB070224: Swift-XRT Refined Analysis
  29. GRB 070224: optical afterglow candidate
  30. GRB 070224, Swift-BAT refined analysis
  31. GRB 070224: MASTER-Net refind analysis
  32. GRB 070224: MASTER-VWF-Kislovodsk observations
  33. GRB 070224: MASTER observations
  34. GRB 070224: Swift detection of a burst
  35. GRB 070223: Optical observations
  36. GRB070223: Swift/UVOT refined analysis
  37. GRB 070223: Optical-IR observation with KANATA
  38. GRB 070223, Swift-BAT refined analysis
  39. GRB 070223: Swift-XRT Refined Analysis
  40. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  41. GRB070223 - SDSS Pre-Burst Observations
  42. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  43. GRB 070223: MDM Observations
  44. GRB070223: Swift burst
  45. Konus-Wind and Konus-A observations of GRB 070220
  46. GRB 070220: MITSuME Okayama Optical Observation
  47. GRB 070220: ART-3 Optical and NIR limits
  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 : Faulkes Telescope North optical limit
  55. GRB 070220: Swift detection of a burst
  56. GRB070219: MASTER-VWF-Kislovodsk observations
  57. GRB 070219: XRT Refined Analysis
  58. GRB 070219: Swift/UVOT Upper limits
  59. GRB 070219: I-band observations
  60. GRB 070219, Swift-BAT refined analysis
  61. GRB 070219: optical TNG observations
  62. GRB 070219: Liverpool Telescope Observations
  63. GRB 070219: ROTSE-III Optical Limits
  64. GRB070219 - SDSS Pre-Burst Observations
  65. GRB 070219: Swift detection of a burst
  66. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  67. GRB 070125 observations with the GMRT
  68. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  69. Swift-BAT trigger 260304 is NOT a burst or transient
  70. GRB 060927: PROMPT Observations
  71. GRB 070201: Correction to GCN 6094
  72. GRB 070129: MDM I-band Detection
  73. GRB 070125: Break in Optical Decay
  74. GRB 070209: Swift XRT analysis
  75. GRB 070201: clarification on localization and Konus-Wind spectra
  76. GRB070208: optical observations
  77. GRB 070201: IPN constraints and nearby galaxies
  78. GRB 070201: Proximity of IPN annulus to M31
  79. GRB 070208: MARGE Optical Observations
  80. IPN localization of very bright long hard GRB 070207
  81. IPN localization of very intense short GRB 070201
  82. GRB 070209, Swift-BAT refined analysis of the short hard burst
  83. GRB 070209: Swift detection of a short hard burst
  84. GRB 070208: Swift XRT refined analysis
  85. GRB 070208: RAPTOR detection of early afterglow onset
  86. GRB070208: Absorption and emission redshift from Gemini
  87. GRB 070208: MDM Optical Decay
  88. GRB 070208, Swift-BAT refined analysis
  89. GRB070208 - SDSS Pre-Burst Observations
  90. GRB 070208: Early IR detection and afterglow astrometry
  91. GRB 070208: Afterglow confirmation from P60
  92. GRB070208: Faulkes Telescope North Afterglow Identification
  93. GRB 070208: ROTSE-III Optical Limits
  94. GRB 070208: MDM Observations
  95. GRB 070208: Swift detection of a burst
  96. GRB 070125 detection with CARMA
  97. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  98. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  99. GRB 070129: afterglow confirmation
  100. GRB070124: Swift-XRT Follow-up Observation

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