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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"

19089 results found.

  1. GRB011212, BVRI field photometry
  2. GRB011211, BVRI field photometry
  3. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  4. Fading of the optical source associated of XRF 011211
  5. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  6. GRB011130 (XRF011130) Chandra Observations
  7. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  8. GRB 011130, K band observations
  9. GRB011130 (XRF011130) SDSS PT i-band observations
  10. XRF011130: Infrared Observations
  11. GRB 011121: J-band observations
  12. GRB 011121: NIR observations, host galaxy?
  13. GRB011121: UBRI Observations
  14. GRB 011121 J-Band Astrometry
  15. GRB 011121: Detection of Bright IR Counterpart
  16. GRB011121: possible redshift, continued decay
  17. GRB 011030: TNG K-band observation
  18. XRF011030: J and K band observations
  19. GRB011030, optical observation
  20. XRF011030: Chandra Observations
  21. GRB011030: Z-band observations
  22. GRB 011030 I-band Observation
  23. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  24. GRB 970828: HST Observations of the Host Galaxy
  25. GRB 000131: HST Detection of the Host Galaxy
  26. GRB 970828: HST Observations of the Host Galaxy
  27. GRB011019: Subaru Optical Observations
  28. GRB011030 - further refinement WFC position
  29. GRB011030: radio search
  30. GRB 010921: Possible supernova component
  31. GRB010921, optical observation at early time
  32. GRB 010921, I-band observations
  33. GRB011019, optical observations
  34. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  35. GRB010921: Spectroscopy of the Host Galaxy
  36. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  37. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  38. GRB010928(=H1770): Localization of a Long GRB by HETE
  39. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  40. GRB010921, negative optical observations
  41. GRB010921 field photometry
  42. H1761: A Bright GRB Detected by HETE
  43. GRB000926, Host Galaxy Observations
  44. GRB001109, Host Galaxy Spectroscopic Observations
  45. Probable SGR or Short Duration GRB Detected by HETE
  46. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  47. BeppoSAX/GRBM detection of GRB010728
  48. GRB 010222 - WHT BVRI images
  49. GRB 010629 Optical Observations
  50. SGR1900+14: High Fluence Burst Localized by HETE
  51. GRB010629, optical observations
  52. GRB010629: A Burst Localized by HETE
  53. SGR1900+14: Second Burst Localized by HETE
  54. SGR1900+14: A Burst Localized by HETE
  55. SGR1806-20: A Second, Intense Burst Localized by HETE
  56. SGR1806-20: Localization by HETE
  57. HETE Fully-Automated GCN Notices
  58. GRB000301C: Late-time HST/STIS observation
  59. GRB010518: a faint BeppoSAX detection
  60. GRB000418: HST/STIS Second-epoch Observations
  61. X-ray precursors to the large flare from SGR 1900+14
  62. GRB010427, Gamma Ray Observations
  63. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  64. Millimeter observation of SGR 1900+14
  65. SGR1900+14, I-band observations
  66. GRB010412, field photometry
  67. Giant flare from SGR1900+14
  68. GRB 010326b Optical Observations
  69. GRB010412: BeppoSAX GRBM and WFC observations
  70. GRB010324, revised field photometry
  71. GRB 980326: Late-time HST/STIS observations
  72. GRB010324, field photometry
  73. GRB010326B, field photometry
  74. GRB010326, field photometry
  75. GRB010220, field photometry
  76. Further Optical Observations of GRB 010324
  77. GRB010222, CXO X-ray observations
  78. GRB010324: BeppoSAX/GRBM data
  79. GRB010324, optical observations
  80. GRB010326B: Localization by HETE (2nd GRB for this date)
  81. GRB 010326 optical observations
  82. GRB010326: Refined Localization by HETE
  83. GRB010326: Localization by HETE
  84. Optical Observations of GRB 010324
  85. IPN TRIANGULATION OF GRB010324
  86. GRB010222, late-time optical observation
  87. Support extension to the BeppoSAX mission
  88. GRB 010222, Optical Observations
  89. GRB010220 optical obsercations
  90. GRB010222 - Optical observation
  91. GRB010222 further R-band photometry
  92. GRB 010222: Keck Spectroscopy
  93. GRB010214, field photometry
  94. GRB010222, field photometry
  95. GRB010222 further R-band photometry
  96. GRB 010222 Kyoto optical observation
  97. GRB010222 R-BAND OBSERVATION
  98. GRB010214 follow-up from Hanle
  99. GRB 010222: Near-IR Observations
  100. GRB 010222: Optical Observations

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