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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"

27029 results found.

  1. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  2. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  3. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  4. radio observations of X-ray/GRB transient field
  5. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  6. Optical report on X-ray/GRB transient
  7. radio detection of X-ray/GRB transient
  8. BeppoSAX: A new fast X-ray transient
  9. GRB990510: photometric and spectroscopic observations with the VLT
  10. GRB 990510: optical linear polarization
  11. GRB 990510: optical observations
  12. GRB990510: X-ray afterglow
  13. VLT spectrum of GRB990510
  14. GRB 990510: BATSE Observations
  15. GRB 990510 Optical Observations
  16. GRB 990510 optical observations
  17. GRB 990510: BeppoSAX/GRBM observations
  18. GRB990510: NFI X-ray source
  19. GRB 990510 optical observations
  20. GRB 990123, optical monitoring
  21. GRB 990506: BATSE Observations
  22. GRB 990510: Final BeppoSAX-WFC Coordinates
  23. GRB 990506, optical observations
  24. GRB990506 observation plan
  25. Refined IPN error box for GRB990506
  26. GRB 990506: Limits on the possible optical transient
  27. GRB 990506, optical observations
  28. IPN localization for GRB990506
  29. GRB 970228: Redshift and properties of the host galaxy
  30. GRB990321 IPN TRIANGULATION
  31. GRB 990316 Optical Observations
  32. GRB 990316, Radio observations
  33. GRB 990316, Optical observations
  34. GRB990316, Optical observations
  35. GRB 990316 optical observations
  36. GRB990316: simultaneous optical observation
  37. ASM/IPN error box for GRB 990308 (BATSE #7457)
  38. GRB 990308a and GRB 990308b
  39. GRB990308 (Trig. 7457), optical observations
  40. GRB990308, Possible new SGR~0209+70
  41. GRB981220, IPN localization
  42. GRB 990217, radio observations
  43. GRB990217: BeppoSAX/GRBM data
  44. GRB990123 observations
  45. GRB990217 Optical observation
  46. GRB990123, Optical Observation
  47. GRB 990123: Discovery of the Probable Host Galaxy
  48. GRB 990123: Reduced HST Images
  49. GRB19990123 observations
  50. GRB 990123: Updated Keck Spectroscopy Results
  51. GRB990123, Optical observation
  52. GRB990123, is the "radio flare" due to an inhomogeneous medium?
  53. GRB990123, Upcoming HST Service Observations
  54. GRB 990123: New Constraints on Possible Foreground Galaxies
  55. GRB990123 Optical Observations
  56. GRB990123, Probability of gravitational lensing
  57. GRB 990123: Detection of the IR Transient, and the Light Curve Fits
  58. GRB 990123: Continued Radio Observations
  59. GRB990123, Preliminary Lens Search Results
  60. On the Lensing Interpretation of GRB 990123
  61. Search for Potential Images of GRB 990123
  62. Search for Potential Images of GRB 990123
  63. GRB990123, Optical BVRI Observations
  64. GRB 990123: near-infrared observations.
  65. GRB990123, OSSE observations
  66. GRB990123: NIR Observation
  67. GRB990123, ASCA X-ray observation of afterglow
  68. "GRB 990123: New BV Observations"
  69. GRB 990123 Optical Follow-Up
  70. GRB 990123: BATSE Observations
  71. GRB 990123 Keck Spectrum update
  72. GRB990123 IPN annulus
  73. GRB 990123 : Multiple and Distorted Images of the Host Galaxy?
  74. GRB990123 Optical Observations
  75. GRB 990123 Spectroscopic Redshifts
  76. GRB 990123: New Optical Observations, Decay Measure
  77. GRB 990123: Possible Gravitationally Lensed Burst?
  78. GRB 990123 optical observations
  79. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  80. GRB 990123 radio observations
  81. GRB 990123, new radio source
  82. GRB 990123: Optical Decay Slope
  83. GRB 990123 r-band photometry
  84. GRB 990123 Optical Follow-up
  85. GRB990123, early optical counterpart detection
  86. GRB990123 Optical Observation
  87. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  88. GRB 990123: Bright New Source, Possible Optical Transient
  89. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  90. Optical Observations of GRB 981220
  91. GRB 981226: radio variable
  92. GRB981220, Optical Observations
  93. GRB 981220 Optical observations
  94. GRB 981226 Optical Observations
  95. GRB 980613: Spectroscopy of the host galaxy
  96. GRB981226, sub-millimeter observations
  97. GRB981220, sub-millimeter observations
  98. GRB981226 BeppoSAX follow up
  99. GRB 981226 radio observations
  100. GRB 981226

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