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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"

43902 results found.

  1. GRB070306: confirmation of near infrared afterglow
  2. GRB 070306: ART-3 early optical and near infrared constraints
  3. GRB 070306: IR observations and candidate afterglow
  4. GRB 070306, Swift-BAT refined analysis
  5. GRB 070306: XRT Team Refined Analysis
  6. GRB 070306: Optical and IR observations with KANATA
  7. GRB070306 - SDSS Pre-burst Observations
  8. GRB 070306: Swift detection of a burst
  9. GRB 070223: NIR observations at WHT
  10. GRB070227: Swift-XRT refined analysis
  11. GRB 060605 new redshift
  12. GRB 070125, deep late-time optical observation
  13. VLA observation of GRB 070224
  14. GRB 070227: optical observations
  15. GRB 070223: Optical Observations
  16. GRB 070227: optical observations
  17. GRB 070227: Swift/UVOT Upper Limits
  18. GRB 070227: TAROT La Silla observatory optical observations
  19. GRB 070227, Swift-BAT refined analysis
  20. GRB070227: possible X-ray afterglow detection
  21. GRB 070227: Swift detection of a burst in ground analysis
  22. GRB 920925C: optical afterglow candidate
  23. GRB 070224: Optical afterglow confirmation
  24. IBAS Alert n. 4144: not a GRB
  25. GRB 070224: Swift/UVOT Upper Limits
  26. GRB070224: Swift-XRT Astrometrically Corrected Position
  27. VLA observation of GRB 070223
  28. VLA observation of GRB 070220
  29. GRB070224: Magellan Imaging Observations
  30. GRB 070224: WHT K-band imaging
  31. GRB 070224: MDM Observations
  32. GRB070224: Gemini Imaging Observations
  33. GRB 070224: SARA upper limit
  34. GRB070224: Swift-XRT Refined Analysis
  35. GRB 070224: optical afterglow candidate
  36. GRB 070224, Swift-BAT refined analysis
  37. GRB 070224: MASTER-Net refind analysis
  38. GRB 070224: MASTER-VWF-Kislovodsk observations
  39. GRB 070224: Swift detection of a burst
  40. GRB 070223: Optical observations
  41. RHESSI Spectrum of GRB070220
  42. GRB070223: Swift/UVOT refined analysis
  43. GRB 070223: Optical-IR observation with KANATA
  44. GRB 070223, Swift-BAT refined analysis
  45. GRB070223: MASTER-VWF-Kislovodsk observations
  46. GRB 070223: Swift-XRT Refined Analysis
  47. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  48. GRB070223 - SDSS Pre-Burst Observations
  49. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  50. GRB 070223: MDM Observations
  51. GRB070223: Swift burst
  52. Konus-Wind and Konus-A observations of GRB 070220
  53. GRB 070220: MITSuME Okayama Optical Observation
  54. GRB 070220 Swift-BAT Refined Analysis
  55. Swift/UVOT refined analysis of GRB070220
  56. GRB 070209: Swift XRT refined analysis
  57. GRB 070220: Swift-XRT Refined Analysis
  58. GRB 070220: Observation with the KANATA 1.5m telescope
  59. GRB 070219: Gemini Observations
  60. GRB 070220 : Faulkes Telescope North optical limit
  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: I-band observations
  66. GRB 070219, Swift-BAT refined analysis
  67. GRB 070219: optical TNG observations
  68. GRB 070219: Liverpool Telescope Observations
  69. GRB 070219: ROTSE-III Optical Limits
  70. GRB070219 - SDSS Pre-Burst Observations
  71. GRB 070219: Swift detection of a burst
  72. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  73. GRB 070125 observations with the GMRT
  74. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  75. Swift-BAT trigger 260304 is NOT a burst or transient
  76. GRB 060927: PROMPT Observations
  77. GRB 070129: MDM I-band Detection
  78. GRB 070125: Break in Optical Decay
  79. GRB 070209: Swift XRT analysis
  80. GRB 070201: clarification on localization and Konus-Wind spectra
  81. GRB070208: optical observations
  82. GRB 070201: IPN constraints and nearby galaxies
  83. GRB 070201: Proximity of IPN annulus to M31
  84. IPN localization of very bright long hard GRB 070207
  85. IPN localization of very intense short GRB 070201
  86. GRB 070209, Swift-BAT refined analysis of the short hard burst
  87. GRB 070209: Swift detection of a short hard burst
  88. GRB 070208: Swift XRT refined analysis
  89. GRB 070208: RAPTOR detection of early afterglow onset
  90. GRB070208: Absorption and emission redshift from Gemini
  91. GRB 070208: MDM Optical Decay
  92. GRB 070208, Swift-BAT refined analysis
  93. GRB070208 - SDSS Pre-Burst Observations
  94. GRB 070208: Early IR detection and afterglow astrometry
  95. GRB 070208: Afterglow confirmation from P60
  96. GRB070208: Faulkes Telescope North Afterglow Identification
  97. GRB 070208: ROTSE-III Optical Limits
  98. GRB 070208: Swift detection of a burst
  99. GRB 070125 detection with CARMA
  100. Swift-BAT trigger 259527 is a Cosmic Ray Shower

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