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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"

25838 results found.

  1. VLA radio upper limit on GRB 080212
  2. Swift/UVOT refined analysis of GRB080212
  3. GRB 080212, Swift-BAT refined analysis
  4. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  5. GRB 080212: GROND detects afterglow
  6. GRB 080212: REM NIR afterglow?
  7. GRB 080212: Enhanced Swift-XRT position
  8. GRB 080212: Swift-XRT Team refined analysis
  9. GRB 080210: Keck photometry
  10. VLA non-detection of GRB 080210
  11. GRB 080212: Swift detection of a burst
  12. GRB 080207: VLT NIR early upper limits
  13. GRB 080210: Swift/UVOT Refined Analysis
  14. GRB 080210, Swift-BAT refined analysis
  15. GRB 080210: Super-LOTIS observations
  16. GRB 080210: Swift-XRT Refined Analysis
  17. GRB 080210: Enhanced Swift-XRT position
  18. GRB 080210: GOND detection in all bands and redshift upper limit
  19. GRB080210 - SDSS Pre-Burst Observations
  20. GRB 080210: Swift detection of a burst with optical afterglow
  21. GRB 080210: TAROT La Silla observatory optical detection
  22. GRB 080207: GROND upper limits
  23. GRB 080205: GAO 150cm telescope Optical limit
  24. GRB 080207, Swift-BAT refined analysis
  25. GRB 080207: Optical limits from Gemini-South
  26. Swift detection of AX J1749.1-2639
  27. GRB 080207: Super-LOTIS observations
  28. GRB 080207, Swift-BAT refined analysis
  29. Swift Trigger 302777 is not a GRB
  30. GRB080207: RTT150 Optical Observations
  31. GRB 080207: REM NIR observations
  32. GRB080207: Swift/UVOT refined analysis
  33. GRB 080207: TAROT Calern observatory optical observations
  34. GRB 080207: Swift-XRT Refined Analysis
  35. GRB 080207: Enhanced Swift-XRT position
  36. GRB 080207: Swift detection of a burst
  37. GRB 080205: optical observation
  38. VLA radio upper limit on GRB 080205
  39. INT+WFC R-band observations of GRB 080205
  40. GRB 080205, Swift-BAT refined analysis
  41. IPN localization of very hard GRB 080204
  42. GRB 080205: Swift XRT refined analysis
  43. GRB 080205: Swift/UVOT observations
  44. GRB 080205: Enhanced Swift-XRT position
  45. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  46. GRB 080130: Swift-BAT refined analysis
  47. GRB 080130: further Swift XRT observations confirm fading source
  48. GRB 080129: Swift/UVOT Refined Upper Limits
  49. Swift/UVOT observations of GRB080130
  50. GRB 080130: REM NIR observations
  51. GRB 080130(?): Swift XRT observation
  52. GRB 080129: Swift-XRT refined analysis
  53. GRB 080129: KAIT optical limits
  54. GRB 080129, Swift-BAT refined analysis
  55. GRB 080129: TAROT La Silla observatory optical observations
  56. GRB 080129: GROND detection in all bands, and fading
  57. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  58. GRB 080129: Enhanced Swift-XRT position
  59. GRB 080129: Gemini-South Imaging Observations
  60. GRB 080129 (?): UVOT Upper Limits
  61. A new website of high-level data products for Swift GRBs
  62. GRB 080123 : Suzaku WAM observation of the prompt emission
  63. Transient 080109/SN 2008D: Spectroscopic Evolution
  64. Konus-Wind observation of GRB 080122
  65. GRB 080122 : Suzaku WAM observation of the prompt emission
  66. GRB 080121: Swift/UVOT upper limits
  67. SNe 2008D and 2007uy: Chandra Detections
  68. GRB 080121: Enhanced Swift-XRT position
  69. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  70. IPN triangulation of GRB080122
  71. GRB 080121: Nearby SDSS galaxies
  72. GRB 080123: Swift-XRT refined analysis
  73. GRB 080123: Swift/UVOT refined analysis
  74. GRB 080123, Swift-BAT refined analysis
  75. GRB 080123: Enhanced Swift-XRT position
  76. GRB 080123: Swift detection of a short burst
  77. GRB 080120: GROND confirmation of the optical afterglow
  78. VLA radio upper limit on GRB 080120
  79. GRB 080120: Swift-XRT refined analysis
  80. GRB 080120: GROND detection
  81. GRB080120: Swift XRT position
  82. GRB 080120: a long GRB detected by INTEGRAL
  83. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  84. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  85. XRF 080109 / SN 2008D: UKIRT JHK imaging
  86. optical observations, XRT in NGC 2770
  87. XRF 080109/SN 2008D: PROMPT Optical Imaging
  88. Gemini-South observations of XRF 080109 / SN 2008D
  89. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  90. Discovery of Radio Emission from Transient in NGC 2770
  91. XRF 080109 in NGC2770: NIR observations at TNG
  92. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  93. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  94. XRF 080109 in NGC2770: Detectable Superluminal Motion
  95. Refined Swift-XRT analysis of the transient in NGC 2770
  96. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  97. GRB 071227: Suzaku WAM observation of the prompt emission
  98. GRB 071227: optical afterglow
  99. Further Swift-BAT analysis of GRB 071227
  100. Konus-Wind observation of GRB 071227

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