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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 080212: Swift-XRT Team refined analysis
  2. GRB 080210: Keck photometry
  3. VLA non-detection of GRB 080210
  4. GRB 080212: Swift detection of a burst
  5. IPN localization of GRB 080211
  6. GRB 080212: DSS/2MASS Galaxy at XRT position
  7. GRB 080207: VLT NIR early upper limits
  8. GRB 080210: Swift/UVOT Refined Analysis
  9. GRB 080207: optical observations.
  10. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  11. GRB 080210, Swift-BAT refined analysis
  12. GRB 080210: Super-LOTIS observations
  13. GRB 080210: Swift-XRT Refined Analysis
  14. GRB 080210: VLT redshift
  15. GRB 080210: Enhanced Swift-XRT position
  16. GRB 080210: Rapid PROMPT Detections
  17. GRB 080210: GOND detection in all bands and redshift upper limit
  18. GRB080210 - SDSS Pre-Burst Observations
  19. GRB 080210: Swift detection of a burst with optical afterglow
  20. GRB 080210: TAROT La Silla observatory optical detection
  21. GRB 080207: GROND upper limits
  22. GRB 080205: GAO 150cm telescope Optical limit
  23. GRB 080207, Swift-BAT refined analysis
  24. GRB 080207: Optical limits from Gemini-South
  25. GRB 080205: RTT150 optical observations
  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. Konus-Wind observation of GRB 080204
  38. GRB 080205 optical upper limit
  39. GRB 080205: MASTER optical observation
  40. GRB 080205: optical observation
  41. VLA radio upper limit on GRB 080205
  42. INT+WFC R-band observations of GRB 080205
  43. GRB 080205, Swift-BAT refined analysis
  44. IPN localization of very hard GRB 080204
  45. GRB 080205: Swift XRT refined analysis
  46. GRB 080205: OA evolution from KAIT observations
  47. GRB 080205: Swift/UVOT observations
  48. GRB 080205: Enhanced Swift-XRT position
  49. GRB 080205: KAIT OA detection
  50. GRB 080205: Swift detection of a burst
  51. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  52. GRB 080130: Swift-BAT refined analysis
  53. GRB 080130: further Swift XRT observations confirm fading source
  54. GRB 080129: Swift/UVOT Refined Upper Limits
  55. Swift/UVOT observations of GRB080130
  56. GRB 080130: REM NIR observations
  57. GRB 080130(?): Swift XRT observation
  58. GRB 080130?: Detection of a possible burst by BATSS
  59. GRB 080129: Optical observations from OSN
  60. GRB 080129: Swift-XRT refined analysis
  61. X-ray transient in NGC 2770: RTT150 optical observations
  62. GRB 080129: KAIT optical limits
  63. GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
  64. GRB 080129: optical limit by Pi of the Sky
  65. GRB 080129, Swift-BAT refined analysis
  66. GRB 080129: TAROT La Silla observatory optical observations
  67. GRB 080129: Gemini-South photometry
  68. GRB 080129: GROND detection in all bands, and fading
  69. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  70. GRB 080129: Enhanced Swift-XRT position
  71. GRB 080129: Gemini-South Imaging Observations
  72. GRB 080129: Swift XRT position
  73. GRB 080129 (?): UVOT Upper Limits
  74. GRB 080129 (?): Swift detection of a possible burst
  75. A new website of high-level data products for Swift GRBs
  76. GRB 080121: Upper limit on X-ray afterglow
  77. GRB 080123 : Suzaku WAM observation of the prompt emission
  78. Swift trigger(=301779) is not a GRB
  79. Transient 080109/SN 2008D: Spectroscopic Evolution
  80. GRB 080122: pseudo-z= 1.93 from prompt emission spectrum
  81. Konus-Wind observation of GRB 080122
  82. GRB 080122 : Suzaku WAM observation of the prompt emission
  83. GRB 080121: Swift/UVOT upper limits
  84. SNe 2008D and 2007uy: Chandra Detections
  85. GRB 080121 position was incorrect
  86. GRB 080121: Enhanced Swift-XRT position
  87. Two non-burst Swift SubThreshold triggers
  88. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  89. IPN triangulation of GRB080122
  90. GRB 080121: Nearby SDSS galaxies
  91. GRB 080121: Swift-BAT detection of a very weak, short burst
  92. GRB 080123: Swift-XRT refined analysis
  93. GRB 080123: Swift/UVOT refined analysis
  94. X-ray transient in NGC 2770: RTT150 optical observations
  95. GRB 080123, Swift-BAT refined analysis
  96. GRB 080123: Enhanced Swift-XRT position
  97. GRB 080123: Swift detection of a short burst
  98. GRB 080120: GROND confirmation of the optical afterglow
  99. XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz
  100. VLA radio upper limit on GRB 080120

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