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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"

32702 results found.

  1. GRB 981220 Optical Observations
  2. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  3. BeppoSAX NFI Observation of GRB980425
  4. GRB980425 Optical Follow-up
  5. GRB980425: X-ray revised positions
  6. GRB980703 Very Long Baseline Interferometry
  7. GRB970508 optical observations
  8. Optical Observations of the Host Galaxy of GRB 980519
  9. GRB980519, Optical Observations
  10. GRB980703, Host galaxy multicolor photometry
  11. GRB 980703 (NFI observations)
  12. GRB980703 optical photometry
  13. GRB 980703: BATSE Observations
  14. GRB980703 optical observations
  15. GRB980703: Radio transient
  16. GRB980703 H-band Observations
  17. GRB 980703: Spectrum of the proposed optical counterpart
  18. RXTE Observation of GRB 980706
  19. GRB980703: Spectrum of the proposed optical counterpart
  20. GRB980703 Transient Optical Follow-Up
  21. GRB980703: LOTIS observation at early times
  22. GRB980613 Optical Observations
  23. GRB 980703
  24. GRB980703 (I band observations)
  25. GRB 980703 H-band Observations
  26. GRB980703: radio source/optical transient
  27. BeppoSAX NFI observations of GRB 980703
  28. GRB980519 observation report
  29. Radio observations of SGRs
  30. GRB 980613 Near-IR observations
  31. GRB980613, optical observations
  32. GRB 980613: Optical transient and its host galaxy
  33. SGR1627-41, RXTE/ASM observations
  34. SGR1627-41, Refined IPN annulus location
  35. GRB 980613: Detection of the probable host galaxy
  36. Reduced error box of SGR 1627-41
  37. SGR1627-41, BeppoSAX-GRBM detections
  38. GRB 980613 Optical Observations
  39. GRB 980613 optical observations
  40. GRB980613 Optical Observations
  41. GRB980613 observations from Palomar
  42. GRB 980613 new optical/IR observations
  43. GRB971214 Secondary Standards
  44. GRB980519 Secondary Standards
  45. SGR1900+14
  46. GRB 980519 Optical Observations
  47. GRB980519 optical observations
  48. GRB980519 I-band observations
  49. GRB 980519
  50. GRB980519 optical observations
  51. GRB 980519 Optical Observations
  52. GRB980519 BATSE Observations
  53. GRB970519, optical follow-up at Schmidt Calern
  54. GRB980519 optical observations
  55. GRB980519 Optical Observations
  56. GRB980519 Optical Observations
  57. GRB980519 IPN POSITION
  58. GRB980519 Optical Observations
  59. GRB 980519 Optical Observations
  60. GRB980519 optical observations
  61. GRB980515, BeppoSAX IAUC to be submitted
  62. GRB980519, BeppoSAX-WFC updated position
  63. GRB 980425 Radio Light Curve
  64. GRB 980425 Brightness Temperature
  65. BSAX Observations of GRB980425 field
  66. IPN web site of GRBs
  67. GRB980425 BATSE observations
  68. SAX J0840.7+2248 Optical Observations
  69. GRB 980425 optical observations
  70. GRB980425: optical obs.
  71. GRB980425: Radio Observations
  72. GRB 980425 optical observations
  73. GRB980326, optical observations
  74. GRB980326, optical observations
  75. GRB980329, Fading IR counterpart to radio source
  76. GRByymmdd, Announcement of automation
  77. GRB980326 IPN annulus
  78. GRB980329
  79. GRB980329 Keck K-band observations
  80. GRB980329 sub-millimeter observations
  81. GRB980329 IPN annulus
  82. GRB980329 optical observations
  83. GRB980329 near-IR observations
  84. GRB980329 optical observations
  85. GRB980326 optical observations
  86. GRB980326 optical observations
  87. GRB970508 SAO RAS optical observations
  88. GRB 971214: Redshift from Keck Observations
  89. Near-IR follow-up on GRB 971227
  90. GRB971214: Keck R & I-band Observations
  91. GRB 971227: Optical Observations
  92. Optical Observations of the GRB 971227 field
  93. GRB971227: Plaskett R-band observations
  94. GRB 971227: Optical clarifications
  95. GRB971227: LOTIS observations
  96. GRB971214: Optical Observations and Calibrations
  97. Optical Observations of GRB 971214 at Keck
  98. GRB 971024: Refined analysis by USNOFS Observations
  99. GRB 971024: USNO Observations
  100. GRB 970925: BATSE Localization

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