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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"
  1. GRB 080218B: GROND upper limits
  2. GRB 080218b, SMARTS optical/IR limits
  3. GRB 080218A, Swift-BAT refined analysis
  4. GRB080218B: Watcher prompt limit
  5. GRB 080211: Suzaku WAM observation of the prompt emission
  6. GRB 080218B: Swift detection of a burst
  7. GRB 080218: Swift detection of a burst
  8. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  9. GRB 080212: VLT optical rapid decay
  10. GRB 080212: REM refined analysis
  11. Konus-Wind observation of GRB 080211
  12. VLA radio upper limit on GRB 080212
  13. Swift/UVOT refined analysis of GRB080212
  14. GRB 080212, Swift-BAT refined analysis
  15. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  16. GRB 080212: Gemini-South optical observations
  17. GRB 080212: GROND detects afterglow
  18. GRB 080212: REM NIR afterglow?
  19. GRB 080212: optical observations
  20. GRB 080212: Enhanced Swift-XRT position
  21. GRB 080212: Swift-XRT Team refined analysis
  22. GRB 080210: Keck photometry
  23. VLA non-detection of GRB 080210
  24. GRB 080212: Swift detection of a burst
  25. IPN localization of GRB 080211
  26. GRB 080212: DSS/2MASS Galaxy at XRT position
  27. GRB 080207: VLT NIR early upper limits
  28. GRB 080210: Swift/UVOT Refined Analysis
  29. GRB 080207: optical observations.
  30. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  31. GRB 080210, Swift-BAT refined analysis
  32. GRB 080210: Super-LOTIS observations
  33. GRB 080210: Swift-XRT Refined Analysis
  34. GRB 080210: VLT redshift
  35. GRB 080210: Enhanced Swift-XRT position
  36. GRB 080210: Rapid PROMPT Detections
  37. GRB 080210: GOND detection in all bands and redshift upper limit
  38. GRB080210 - SDSS Pre-Burst Observations
  39. GRB 080210: Swift detection of a burst with optical afterglow
  40. GRB 080210: TAROT La Silla observatory optical detection
  41. GRB 080207: GROND upper limits
  42. GRB 080205: GAO 150cm telescope Optical limit
  43. GRB 080207, Swift-BAT refined analysis
  44. GRB 080207: Optical limits from Gemini-South
  45. GRB 080205: RTT150 optical observations
  46. Swift detection of AX J1749.1-2639
  47. GRB 080207: Super-LOTIS observations
  48. GRB 080207, Swift-BAT refined analysis
  49. Swift Trigger 302777 is not a GRB
  50. GRB080207: RTT150 Optical Observations
  51. GRB 080207: REM NIR observations
  52. GRB080207: Swift/UVOT refined analysis
  53. GRB 080207: TAROT Calern observatory optical observations
  54. GRB 080207: Swift-XRT Refined Analysis
  55. GRB 080207: Enhanced Swift-XRT position
  56. GRB 080207: Swift detection of a burst
  57. Konus-Wind observation of GRB 080204
  58. GRB 080205 optical upper limit
  59. GRB 080205: MASTER optical observation
  60. GRB 080205: optical observation
  61. VLA radio upper limit on GRB 080205
  62. INT+WFC R-band observations of GRB 080205
  63. GRB 080205, Swift-BAT refined analysis
  64. IPN localization of very hard GRB 080204
  65. GRB 080205: Swift XRT refined analysis
  66. GRB 080205: OA evolution from KAIT observations
  67. GRB 080205: Swift/UVOT observations
  68. GRB 080205: Enhanced Swift-XRT position
  69. GRB 080205: KAIT OA detection
  70. GRB 080205: Swift detection of a burst
  71. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  72. GRB 080130: Swift-BAT refined analysis
  73. GRB 080130: further Swift XRT observations confirm fading source
  74. GRB 080129: Swift/UVOT Refined Upper Limits
  75. Swift/UVOT observations of GRB080130
  76. GRB 080130: REM NIR observations
  77. GRB 080130(?): Swift XRT observation
  78. GRB 080130?: Detection of a possible burst by BATSS
  79. GRB 080129: Optical observations from OSN
  80. GRB 080129: Swift-XRT refined analysis
  81. X-ray transient in NGC 2770: RTT150 optical observations
  82. GRB 080129: KAIT optical limits
  83. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  84. GRB 080129: optical limit by Pi of the Sky
  85. GRB 080129, Swift-BAT refined analysis
  86. GRB 080129: TAROT La Silla observatory optical observations
  87. GRB 080129: Gemini-South photometry
  88. GRB 080129: GROND detection in all bands, and fading
  89. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  90. GRB 080129: Enhanced Swift-XRT position
  91. GRB 080129: Gemini-South Imaging Observations
  92. GRB 080129: Swift XRT position
  93. GRB 080129 (?): UVOT Upper Limits
  94. GRB 080129 (?): Swift detection of a possible burst
  95. A new website of high-level data products for Swift GRBs
  96. GRB 080121: Upper limit on X-ray afterglow
  97. GRB 080123 : Suzaku WAM observation of the prompt emission
  98. Swift trigger(=301779) is not a GRB
  99. Transient 080109/SN 2008D: Spectroscopic Evolution
  100. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum

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