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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"

28239 results found.

  1. Correction to IPN error box for GRB000419
  2. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  3. GRB000416 BRJK observations
  4. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  5. GRB 000408, optical observations
  6. GRB 991208, UBVRI field photometry
  7. GRB000408, lotis optical observations
  8. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  9. GRB000301C - Addendum to GCN 623
  10. GRB 000323, optical observations
  11. GRB 000326: Optical Observations
  12. GRB000326, Radio observations
  13. GRB000313, Radio observations
  14. GRB 000313 - optical transient in the BATSE error box
  15. GRB 000307, Optical Observations
  16. GRB 000307, BVRI Field Photometry
  17. GRB 000301C: A Precise Redshift Determination
  18. GRB 000301C, Optical Observation
  19. GRB 000301C: HST/STIS CCD Imaging of the field
  20. IPN error box for GRB000307
  21. GRB000301C, optical R-band observations
  22. GRB 000301C Optical Observations
  23. GRB 000301C: K' Observations
  24. GRB000301C OT candidate optical observations
  25. GRB000301C - Host galaxy not detected in R (?)
  26. Optical observations of GRB000301c
  27. GRB000301C, Radio observations
  28. GRB000301C, Radio observations
  29. GRB000301C, near-infrared observations (JHK' imaging)
  30. GRB 000301c near-IR observations
  31. GRB 000301C, UBVRI field photometry
  32. GRB 000301C: OT confirmed
  33. GRB000301c optical observations
  34. GRB000301C, optical observations
  35. GRB000301C
  36. GRB 000301C : Optical Candidate
  37. GRB000301C: RXTE/ASM and IPN localizations
  38. GRB000226 [IPN Position]
  39. HST Observations of GRB 990712
  40. GRB 000214 near-IR observations
  41. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  42. GRB000210, Radio Observations
  43. GRB 000115, BVRI field photometry
  44. GRB000214: BeppoSAX GRBM and WFC Detection
  45. Optical observations of GRB000210
  46. GRB000210 X-ray afterglow
  47. GRB000214: X-ray afterglow candidate
  48. GRB000214 refined BeppoSAX-WFC position
  49. GRB 000210: BATSE Observations
  50. Optical observations of the Chandra X-ray source for GRB000210
  51. GRB000210, Radio Observations
  52. IPN triangulation of GRB000210
  53. GRB000210: possible afterglow detection with BeppoSAX NFI
  54. GRB000201, Radio Observations
  55. GRB000210: BeppoSAX GRBM and WFC Detection
  56. SAX_WFC_GRB_NOTICE
  57. SAX_WFC_GRB_NOTICE
  58. GRB000201 Optical Observations
  59. GRB 000201: TAROT optical observations
  60. GRB 991208, radio observations
  61. BATSE+IPN location of GRB000131
  62. IPN localization of GRB000131
  63. GRB 000126, optical observations
  64. BATSE Observations of GRB000115
  65. Second RXTE Observation of GRB 000115
  66. GRB991216, UBVRIJHK field photometry
  67. GCN resumes full operations
  68. GRB 991216 VLBA Observations
  69. GRB 991216: J band spectrophotometry
  70. GRB 991216: Detection of the Host and/or Absorber Galaxy
  71. IPN localization of GRB991226
  72. GRB 991216 RXTE ASM Observations
  73. GRB 991216: Updated BATSE parameters
  74. GRB 991217 (SAX J2303.2+0015) Optical observations
  75. Chandra observation of the X-ray afterglow of GRB991216
  76. GRB 991216, optical observations
  77. GRB 991216 Optical spectroscopy/imaging
  78. SAX J2303.2+0015 Optical observations
  79. IR observations of GRB991216
  80. GRB 991217 (SAX J2303.2+0015) Optical observations
  81. GRB991216 Optical and infrared observations of Beethoven Burst
  82. GRB 991216 Radio Observations
  83. GRB 991208 Keck Spectroscopy
  84. GRB 991208 Infrared Detection
  85. GRB991216
  86. GRB 991216--Summary of RXTE Observations
  87. GRB 991216 Optical Observations
  88. GRB 991216, optical observations
  89. GRB 991208 SAO-RAS Spectroscopy
  90. SAX J2303.2+0015: an x-ray/GRB?
  91. GRB 991216, Optical Transient
  92. GRB991216 ('Beethoven Burst') B, R, and K Observations
  93. GRB991216, infrared observations
  94. GRB 991208 optical observations
  95. GRB 991216 Optical Observation
  96. GRB 991216: Extremely bright BATSE burst
  97. R-band Observations of GRB991208 at TNG
  98. GRB991208, optical observations
  99. GRB 991208, Optical Observation
  100. GRB991208, optical observations

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