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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"

36405 results found.

  1. GRB 070125: X-ray light curve analysis
  2. VLA observation of GRB 070306
  3. IBAS Alert 4162: Not a GRB
  4. GRB 070306: NOT observations
  5. GRB 070306 Swift/UVOT refined analysis
  6. GRB070306: confirmation of near infrared afterglow
  7. GRB 070306: ART-3 early optical and near infrared constraints
  8. GRB 070306: IR observations and candidate afterglow
  9. GRB 070306, Swift-BAT refined analysis
  10. GRB 070306: XRT Team Refined Analysis
  11. GRB 070306: Optical and IR observations with KANATA
  12. GRB070306 - SDSS Pre-burst Observations
  13. GRB 070306: Swift detection of a burst
  14. GRB 070223: NIR observations at WHT
  15. GRB070227: Swift-XRT refined analysis
  16. GRB 060605 new redshift
  17. GRB 070125, deep late-time optical observation
  18. VLA observation of GRB 070224
  19. GRB 070227: optical observations
  20. GRB 070223: Optical Observations
  21. GRB 070227: optical observations
  22. GRB 070227: Swift/UVOT Upper Limits
  23. GRB 070227: TAROT La Silla observatory optical observations
  24. GRB 070227, Swift-BAT refined analysis
  25. GRB070227: possible X-ray afterglow detection
  26. GRB 070227: Swift detection of a burst in ground analysis
  27. GRB 920925C: optical afterglow candidate
  28. GRB 070224: Optical afterglow confirmation
  29. IBAS Alert n. 4144: not a GRB
  30. GRB 070224: Swift/UVOT Upper Limits
  31. VLA observation of GRB 070223
  32. VLA observation of GRB 070220
  33. GRB070224: Magellan Imaging Observations
  34. GRB 070224: WHT K-band imaging
  35. GRB 070224: MDM Observations
  36. GRB 070224: SARA upper limit
  37. GRB070224: Swift-XRT Refined Analysis
  38. GRB 070224: optical afterglow candidate
  39. GRB 070224, Swift-BAT refined analysis
  40. GRB 070224: MASTER-Net refind analysis
  41. GRB 070224: MASTER-VWF-Kislovodsk observations
  42. GRB 070224: MASTER observations
  43. GRB 070224: Swift detection of a burst
  44. GRB 070223: Optical observations
  45. GRB070223: Swift/UVOT refined analysis
  46. GRB 070223: Optical-IR observation with KANATA
  47. GRB 070223, Swift-BAT refined analysis
  48. GRB 070223: Swift-XRT Refined Analysis
  49. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  50. GRB070223 - SDSS Pre-Burst Observations
  51. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  52. GRB 070223: MDM Observations
  53. GRB070223: Swift burst
  54. Konus-Wind and Konus-A observations of GRB 070220
  55. GRB 070220: MITSuME Okayama Optical Observation
  56. GRB 070220: ART-3 Optical and NIR limits
  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: Observation with the KANATA 1.5m telescope
  62. GRB 070219: Gemini Observations
  63. GRB 070220 : Faulkes Telescope North optical limit
  64. GRB 070220: Swift detection of a burst
  65. GRB070219: MASTER-VWF-Kislovodsk observations
  66. GRB 070219: XRT Refined Analysis
  67. GRB 070219: Swift/UVOT Upper limits
  68. GRB 070219: I-band observations
  69. GRB 070219, Swift-BAT refined analysis
  70. GRB 070219: optical TNG observations
  71. GRB 070219: Liverpool Telescope Observations
  72. GRB 070219: ROTSE-III Optical Limits
  73. GRB070219 - SDSS Pre-Burst Observations
  74. GRB 070219: Swift detection of a burst
  75. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  76. GRB 070125 observations with the GMRT
  77. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  78. Swift-BAT trigger 260304 is NOT a burst or transient
  79. GRB 060927: PROMPT Observations
  80. GRB 070201: Correction to GCN 6094
  81. GRB 070129: MDM I-band Detection
  82. GRB 070125: Break in Optical Decay
  83. GRB 070209: Swift XRT analysis
  84. GRB 070201: clarification on localization and Konus-Wind spectra
  85. GRB070208: optical observations
  86. GRB 070201: IPN constraints and nearby galaxies
  87. GRB 070201: Proximity of IPN annulus to M31
  88. GRB 070208: MARGE Optical Observations
  89. IPN localization of very bright long hard GRB 070207
  90. IPN localization of very intense short GRB 070201
  91. GRB 070209, Swift-BAT refined analysis of the short hard burst
  92. GRB 070209: Swift detection of a short hard burst
  93. GRB 070208: Swift XRT refined analysis
  94. GRB 070208: RAPTOR detection of early afterglow onset
  95. GRB070208: Absorption and emission redshift from Gemini
  96. GRB 070208: MDM Optical Decay
  97. GRB 070208, Swift-BAT refined analysis
  98. GRB070208 - SDSS Pre-Burst Observations
  99. GRB 070208: Early IR detection and afterglow astrometry
  100. GRB 070208: Afterglow confirmation from P60

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