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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

25222 results found.

  1. GRB 080210: Enhanced Swift-XRT position
  2. GRB 080210: GOND detection in all bands and redshift upper limit
  3. GRB080210 - SDSS Pre-Burst Observations
  4. GRB 080210: Swift detection of a burst with optical afterglow
  5. GRB 080210: TAROT La Silla observatory optical detection
  6. GRB 080207: GROND upper limits
  7. GRB 080205: GAO 150cm telescope Optical limit
  8. GRB 080207, Swift-BAT refined analysis
  9. GRB 080207: Optical limits from Gemini-South
  10. Swift detection of AX J1749.1-2639
  11. GRB 080207: Super-LOTIS observations
  12. GRB 080207, Swift-BAT refined analysis
  13. Swift Trigger 302777 is not a GRB
  14. GRB080207: RTT150 Optical Observations
  15. GRB 080207: REM NIR observations
  16. GRB080207: Swift/UVOT refined analysis
  17. GRB 080207: TAROT Calern observatory optical observations
  18. GRB 080207: Swift-XRT Refined Analysis
  19. GRB 080207: Enhanced Swift-XRT position
  20. GRB 080207: Swift detection of a burst
  21. GRB 080205: optical observation
  22. VLA radio upper limit on GRB 080205
  23. INT+WFC R-band observations of GRB 080205
  24. GRB 080205, Swift-BAT refined analysis
  25. IPN localization of very hard GRB 080204
  26. GRB 080205: Swift XRT refined analysis
  27. GRB 080205: Swift/UVOT observations
  28. GRB 080205: Enhanced Swift-XRT position
  29. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  30. GRB 080130: Swift-BAT refined analysis
  31. GRB 080130: further Swift XRT observations confirm fading source
  32. GRB 080129: Swift/UVOT Refined Upper Limits
  33. Swift/UVOT observations of GRB080130
  34. GRB 080130: REM NIR observations
  35. GRB 080130(?): Swift XRT observation
  36. GRB 080129: Swift-XRT refined analysis
  37. GRB 080129: KAIT optical limits
  38. GRB 080129, Swift-BAT refined analysis
  39. GRB 080129: TAROT La Silla observatory optical observations
  40. GRB 080129: GROND detection in all bands, and fading
  41. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  42. GRB 080129: Enhanced Swift-XRT position
  43. GRB 080129: Gemini-South Imaging Observations
  44. GRB 080129 (?): UVOT Upper Limits
  45. A new website of high-level data products for Swift GRBs
  46. GRB 080123 : Suzaku WAM observation of the prompt emission
  47. Transient 080109/SN 2008D: Spectroscopic Evolution
  48. Konus-Wind observation of GRB 080122
  49. GRB 080122 : Suzaku WAM observation of the prompt emission
  50. GRB 080121: Swift/UVOT upper limits
  51. SNe 2008D and 2007uy: Chandra Detections
  52. GRB 080121: Enhanced Swift-XRT position
  53. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  54. IPN triangulation of GRB080122
  55. GRB 080121: Nearby SDSS galaxies
  56. GRB 080123: Swift-XRT refined analysis
  57. GRB 080123: Swift/UVOT refined analysis
  58. GRB 080123, Swift-BAT refined analysis
  59. GRB 080123: Enhanced Swift-XRT position
  60. GRB 080123: Swift detection of a short burst
  61. GRB 080120: GROND confirmation of the optical afterglow
  62. VLA radio upper limit on GRB 080120
  63. GRB 080120: Swift-XRT refined analysis
  64. GRB 080120: GROND detection
  65. GRB080120: Swift XRT position
  66. GRB 080120: a long GRB detected by INTEGRAL
  67. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  68. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  69. XRF 080109 / SN 2008D: UKIRT JHK imaging
  70. optical observations, XRT in NGC 2770
  71. XRF 080109/SN 2008D: PROMPT Optical Imaging
  72. Gemini-South observations of XRF 080109 / SN 2008D
  73. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  74. Discovery of Radio Emission from Transient in NGC 2770
  75. XRF 080109 in NGC2770: NIR observations at TNG
  76. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  77. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  78. XRF 080109 in NGC2770: Detectable Superluminal Motion
  79. Refined Swift-XRT analysis of the transient in NGC 2770
  80. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  81. GRB 071227: Suzaku WAM observation of the prompt emission
  82. GRB 071227: optical afterglow
  83. Further Swift-BAT analysis of GRB 071227
  84. Konus-Wind observation of GRB 071227
  85. GRB 071227: Swift-XRT refined analysis
  86. GRB 071227: VLT probable redshift of the candidate host galaxy
  87. GRB071227: Swift/UVOT refined analysis
  88. GRB 071227: REM NIR and Optical observations
  89. Swift-BAT refined analysis of short GRB 071227
  90. GRB 071227: Swift detection of a burst
  91. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  92. GRB 071125: Suzaku WAM observation of the prompt emission
  93. GRB 070429B: Probable host galaxy and redshift
  94. GRB 071129, Swift-BAT refined analysis
  95. GRB 071126: Enhanced Swift-XRT position
  96. GRB071122: Swift/UVOT Observations
  97. GRB071104: NIR Afterglow Candidate at TNG
  98. GRB 071122, Swift-BAT refined analysis
  99. GRB 071122 Swift-XRT refined analysis
  100. GRB 071122: P60 Optical Afterglow Candidate

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