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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19225 results found.

  1. GRB 000301C: A Precise Redshift Determination
  2. GRB 000301C, Optical Observation
  3. IPN error box for GRB000307
  4. GRB000301C, optical R-band observations
  5. GRB000301c - R photometry and nearby faint source confirmation
  6. GRB 000301C Optical Observations
  7. GRB 000301C: K' Observations
  8. GRB000301C OT candidate optical observations
  9. GRB000301C - Host galaxy not detected in R (?)
  10. GRB000301C, near-infrared observations (JHK' imaging)
  11. GRB 000301c near-IR observations
  12. GRB000301C 250 GHz detection
  13. GRB000301C, optical observations
  14. GRB000301C
  15. GRB 000301C : Optical Candidate
  16. GRB000301C: RXTE/ASM and IPN localizations
  17. GRB000226 [IPN Position]
  18. GRB000214: BeppoSAX GRBM and WFC Detection
  19. GRB000214 refined BeppoSAX-WFC position
  20. GRB 000210: BATSE Observations
  21. IPN triangulation of GRB000210
  22. GRB000210: possible afterglow detection with BeppoSAX NFI
  23. GRB000210: BeppoSAX GRBM and WFC Detection
  24. SAX_WFC_GRB_NOTICE
  25. SAX_WFC_GRB_NOTICE
  26. GRB000201 Optical Observations
  27. GRB 000201: TAROT optical observations
  28. GRB 991208, radio observations
  29. BATSE+IPN location of GRB000131
  30. IPN localization of GRB000131
  31. GRB 000126, optical observations
  32. BATSE location of GRB000126
  33. IPN localization of GRB000126
  34. BATSE Observations of GRB000115
  35. Second RXTE Observation of GRB 000115
  36. GRB991216 late optical observation
  37. GCN resumes full operations
  38. GRB 991216 VLBA Observations
  39. GRB 991216: J band spectrophotometry
  40. GRB 991216: Detection of the Host and/or Absorber Galaxy
  41. IPN localization of GRB991226
  42. GRB 991216 RXTE ASM Observations
  43. GRB 991216: Updated BATSE parameters
  44. Chandra observation of the X-ray afterglow of GRB991216
  45. GRB 991216, optical observations
  46. GRB 991216 Optical spectroscopy/imaging
  47. GRB991216 Optical and infrared observations of Beethoven Burst
  48. GRB 991208 Keck Spectroscopy
  49. GRB 991216--Summary of RXTE Observations
  50. SAX J2303.2+0015: an x-ray/GRB?
  51. GRB 991208 optical observations
  52. GRB 991216 Optical Observation
  53. GRB 991216: Extremely bright BATSE burst
  54. R-band Observations of GRB991208 at TNG
  55. GRB991208, optical observations
  56. GRB 991208 optical observations
  57. GRB991106: BeppoSAX/BATSE results
  58. GRB991106, near-infrared observations
  59. BeppoSAX NFI Observation of GRB991106
  60. GRB 991106, radio observations
  61. GRB991106: the first BeppoSAX short GRB detection?
  62. GRB 991105: BATSE Observations
  63. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  64. GRB 991014 - BeppoSAX NFI observations
  65. GRB 990915 optical observations
  66. Optical Observations of GRB990907
  67. GRB990907: BeppoSAX follow up and X-ray afterglow
  68. GRB990907: refined WFC position
  69. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  70. GRB 990712 Late Optical Decay and Host Galaxy
  71. GRB990806 BeppoSAX follow up
  72. GRB990806: BATSE Observations
  73. GRB 990806 Optical observations
  74. GRB 990806, Optical Observations
  75. GRB 990806, optical observations
  76. GRB990806 UBVRIJHK observations
  77. GRB 990712
  78. GRB 990705, R-band observations
  79. Infrared and Optical Observations of GRB990705
  80. GRB990704: SAX-NFI results summary
  81. Refined BeppoSAX-WFC position of GRB990704: Errata Corrige
  82. GRB990704, optical observations
  83. Refined BeppoSAX-WFC position of GRB990704
  84. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  85. Optical Observations of GRB990627
  86. BeppoSAX: GRB990625
  87. Late Afterglows of GRBs 990510, 990123
  88. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  89. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  90. radio observations of X-ray/GRB transient field
  91. Optical report on X-ray/GRB transient
  92. radio detection of X-ray/GRB transient
  93. BeppoSAX: A new fast X-ray transient
  94. GRB 990510: optical observations
  95. GRB 990510: optical observations
  96. GRB 990506 R band observations
  97. GRB990510: X-ray afterglow
  98. GRB 990510: Broad Band Break
  99. GRB 990510: BATSE Observations
  100. GRB 990510: BeppoSAX/GRBM observations

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