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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"

35155 results found.

  1. IPN triangulation of GRB010921 (=H1761)
  2. H1761: A Bright GRB Detected by HETE
  3. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  4. HETE Trigger #1760 (GRB 010920B?): a new optical source
  5. HETE Trigger #1759 (GRB 010920?) optical observations
  6. GRB001109, Host Galaxy Astrometry
  7. GRB000926, Host Galaxy Observations
  8. GRB001109, Host Galaxy Spectroscopic Observations
  9. Probable SGR or Short Duration GRB Detected by HETE
  10. GRB000926 Host Galaxy Observations
  11. GRB 010222: HST observations -- host galaxy and late-time decay
  12. BeppoSAX/GRBM detection of GRB 010801
  13. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  14. GRB 010222 - WHT BVRI images
  15. GRB 010629 Optical Observations
  16. GRB010629: Optical Observations
  17. GRB010629, optical observations
  18. IPN triangulation of GRB010629
  19. GRB010629: A Burst Localized by HETE
  20. Possible burst from SGR1806-20
  21. IPN detection of SGR1900+14
  22. GRB 00630: Host Galaxy
  23. IPN triangulation of GRB010613
  24. IPN triangulation of GRB010612
  25. HETE Fully-Automated GCN Notices
  26. GRB000301C: Late-time HST/STIS observation
  27. GRB010518: a faint BeppoSAX detection
  28. GRB000418: HST/STIS Second-epoch Observations
  29. GRB010427, Gamma Ray Observations
  30. SGR1900+14
  31. GRB 010222 /corrections to VBT data
  32. Possible precursor to the SGR1900+14 giant burst
  33. IPN Triangulation of the Giant Flare from SGR1900+14
  34. GRB010412, field photometry
  35. GRB 010326b Optical Observations
  36. GRB010412: Optical observations
  37. GRB010412: Optical observations
  38. IPN Triangulation of GRB010412
  39. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  40. BeppoSAX GRB ALERT: GRB010412
  41. GRB Observation Report
  42. GRB010324, revised field photometry
  43. REVISED LOCATION OF GRB010326A
  44. GRB 980326: Late-time HST/STIS observations
  45. GRB010324, field photometry
  46. GRB010326B, field photometry
  47. GRB010326, field photometry
  48. GRB010220, field photometry
  49. Further Optical Observations of GRB 010324
  50. GRB 010326A: Further optical observations
  51. GRB010324: BeppoSAX/GRBM data
  52. GRB 010326B: Optical observations
  53. GRB010324, optical observations
  54. GRB010326B: Localization by HETE (2nd GRB for this date)
  55. GRB 010326: Optical observations
  56. GRB 010326 optical observations
  57. GRB010326: Refined Localization by HETE
  58. GRB010326: Localization by HETE
  59. Duration, ECT, peak flux and fluence of GRB010324
  60. Optical Observations of GRB 010324
  61. IPN TRIANGULATION OF GRB010324
  62. GRB990705, VLT-FORS1 observations of the host galaxy
  63. GRB010222, late-time optical observation
  64. Support extension to the BeppoSAX mission
  65. GRB 010222 - HEGRA GeV/TeV Observations
  66. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  67. GRB010222: Chandra X-ray Observatory Observation
  68. GRB010222: Sub-millimeter vanishing act
  69. GRB 010222, Optical Observations
  70. GRB 010222: High-Resolution Keck Spectroscopy
  71. GRB 010214, I-band data
  72. Sub-millimeter Excess/GRB 010222
  73. GRB 010222
  74. GRB 010222 HST/Chandra TOO
  75. GRB 010222
  76. GRB010222 further R-band photometry
  77. GRB010222: R-band data
  78. GRB010222 Optical observations
  79. GRB 010222: Keck Spectroscopy
  80. GRB010214, field photometry
  81. GRB010222, field photometry
  82. GRB010222 further R-band photometry
  83. GRB010222, possible increase of optical decay slope
  84. GRB 010222 Kyoto optical observation
  85. GRB010222: fading behavior
  86. GRB 010222 BV optical observations
  87. GRB 010220: Near-IR Observations
  88. GRB010214 follow-up from Hanle
  89. GRB 010222: Near-IR Observations
  90. GRB 010222: Optical Observations
  91. GRB 010222, Decay Slope Confirmed
  92. GRB010222: Another absorption line system
  93. GRB010222: Optical decay slope
  94. GRB 010214, Optical Observations
  95. GRB010222: Sub-millimeter detection
  96. GRB010222: R-band fading behavior
  97. GRB010222: Optical Observations
  98. GRB010222, optical observations
  99. GRB010222: BeppoSAX/NFI Observations
  100. Redshift of the Optical Transient of GRB010222

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