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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"

42811 results found.

  1. GRB000424 Optical Observations
  2. GRB 000418, Optical Observation
  3. GRB000424, optical observations
  4. GRB 000424, Optical Observations
  5. GRB 000418, Optical Observation
  6. GRB000418, near-infrared observations
  7. BeppoSAX GRB000424
  8. Correction to IPN error box for GRB000419
  9. IPN error box for GRB000418
  10. GRB000419 [IPN Position]
  11. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  12. GRB000416 BRJK observations
  13. 1SAXJ1715.0-7134 refined position
  14. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  15. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  16. Budget cuts in BeppoSAX operations: impact on GRB observations
  17. GRB 000408, optical observations
  18. Refined IPN error box for GRB000408
  19. GRB 991208, UBVRI field photometry
  20. GRB000301c results
  21. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  22. GRB000408 [IPN Position]
  23. GRB000326 Optical Observations
  24. GRB000301C - Addendum to GCN 623
  25. GRB000301C - R magnitude lower limit
  26. GRB000326, Further VLA observations
  27. GRB 000323, optical observations
  28. GRB 000326: Optical Observations
  29. GRB000326, Radio observations
  30. GRB000326 [IPN Position]
  31. GRB 000307 optical observations
  32. GRB000323 [IPN Position]
  33. GRB000315 [IPN Positions]
  34. GRB000313, Radio observations
  35. GRB 000313 - optical transient in the BATSE error box
  36. GRB000301C - B and R photometry
  37. GRB000301C - R photometry
  38. GRB 000307, BVRI Field Photometry
  39. GRB 000301C: Optical Spectrum and Redshift
  40. GRB 000301C: Optical Spectrum and Redshift
  41. GRB 000301C: A Precise Redshift Determination
  42. GRB 000301C, Optical Observation
  43. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  44. GRB 000301C: HST/STIS CCD Imaging of the field
  45. IPN error box for GRB000307
  46. GRB 000301c: K' observations
  47. GRB000301C, optical R-band observations
  48. GRB000301c - R photometry and nearby faint source confirmation
  49. GRB 000301C, Optical Observation
  50. GRB 000301c: K' observations
  51. GRB 000301C Optical Observations
  52. GRB 000301C: K' Observations
  53. GRB000301C OT candidate optical observations
  54. GRB000301C - Host galaxy not detected in R (?)
  55. Optical observations of GRB000301c
  56. GRB000301C, Radio observations
  57. GRB000301C, Radio observations
  58. GRB000301C optical observations
  59. GRB000301C, near-infrared observations (JHK' imaging)
  60. GRB 000301c near-IR observations
  61. GRB 000301C, Optical Color
  62. GRB000301C, Optical Spectroscopy
  63. GRB 000301C, UBVRI field photometry
  64. GRB 000301C, Optical Observation
  65. GRB000301C, optical observations
  66. GRB000301C 250 GHz detection
  67. GRB 000301C R-band observation
  68. GRB 000301C, Optical Observation
  69. GRB000301C, near-infrared observations (JHK' photometry)
  70. GRB 000301C: OT confirmed
  71. GRB000301c optical observations
  72. GRB 000301A, Radio Observations
  73. GRB000301C, optical observations
  74. GRB000301c, near-infrared observations
  75. GRB000301C
  76. GRB 000301C : Optical Candidate
  77. Radio observations of the error box of GRB000301A
  78. GRB000301C: RXTE/ASM and IPN localizations
  79. GRB000226 [IPN Position]
  80. HST Observations of GRB 990712
  81. GRB 000214 near-IR observations
  82. GRB 000115 Optical observations
  83. GRB 000214, Radio Observations
  84. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  85. GRB000210, Radio Observations
  86. GRB 000115, BVRI field photometry
  87. GRB000214: BeppoSAX GRBM and WFC Detection
  88. IPN annulus for GRB000214
  89. Optical observations of GRB000210
  90. GRB000210 X-ray afterglow
  91. GRB000214: X-ray afterglow candidate
  92. GRB000214 refined BeppoSAX-WFC position
  93. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  94. GRB 000210: BATSE Observations
  95. Correction to Chandra Position of GRB000210 afterglow
  96. Optical observations of the Chandra X-ray source for GRB000210
  97. GRB000210, Radio Observations
  98. Optical candidate for GRB000210
  99. Chandra Observations of GRB000210 X-ray Afterglow
  100. IPN triangulation of GRB000210

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