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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20559 results found.

  1. GRB980519, HST/STIS observations of the host galaxy
  2. GRB000607, Radio Observations
  3. GRB000604 - Optical observations
  4. GRB000604, optical observations
  5. GRB000528, optical observations at ESO
  6. GRB 000604 optical observations
  7. GRB 000418: Detection of the Host Galaxy
  8. GRB000604, optical observations, comparison with DPOSS
  9. GRB000528, Radio Observations
  10. GRB000529: Optical Observations
  11. GRB000519: Optical observations
  12. GRB000528: BeppoSAX GRBM observations
  13. GRB 000528 Optical Observations
  14. Re: GRB000508B : Optical observations
  15. GRB 000418, Optical observation
  16. GRB000508B, optical photometry
  17. Possible GRB-related phenomenon
  18. GRB 000424 Optical Observations
  19. GRB000418, UBVRI field photometry update
  20. The redshift of GRB 000418
  21. GRB000424, optical observations
  22. GRB 000418, Optical Observation
  23. GRB000424 Optical Observations
  24. GRB000424, optical observations
  25. GRB000424, optical observations
  26. GRB 000424, Optical Observations
  27. GRB 000418, Optical Observation
  28. GRB000418, near-infrared observations
  29. GRB000416 Optical Observations
  30. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  31. GRB000416 BRJK observations
  32. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  33. Budget cuts in BeppoSAX operations: impact on GRB observations
  34. GRB 000408, optical observations
  35. GRB000408: Optical CCD Observations from MIRO
  36. GRB000408, lotis optical observations
  37. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  38. GRB000326 Optical Observations
  39. GRB000301C - Addendum to GCN 623
  40. GRB000301C - R magnitude lower limit
  41. GRB000326, Further VLA observations
  42. GRB 000323, optical observations
  43. GRB 000326: Optical Observations
  44. GRB000326, Radio observations
  45. GRB 000307 optical observations
  46. GRB000313, Radio observations
  47. GRB 000313 - optical transient in the BATSE error box
  48. GRB000301C - B and R photometry
  49. GRB 000307, Optical Observations
  50. GRB 000301C: A Precise Redshift Determination
  51. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  52. GRB 000301C: HST/STIS CCD Imaging of the field
  53. GRB 000301c: K' observations
  54. GRB000301C, optical R-band observations
  55. GRB000301c - R photometry and nearby faint source confirmation
  56. GRB 000301C, Optical Observation
  57. GRB 000301c: K' observations
  58. GRB 000301C Optical Observations
  59. GRB 000301C: K' Observations
  60. GRB000301C OT candidate optical observations
  61. GRB000301C - Host galaxy not detected in R (?)
  62. Optical observations of GRB000301c
  63. GRB000301C, Radio observations
  64. GRB000301C, Radio observations
  65. GRB000301C optical observations
  66. GRB000301C, near-infrared observations (JHK' imaging)
  67. GRB 000301c near-IR observations
  68. GRB000301C, optical observations
  69. GRB000301C, near-infrared observations (JHK' photometry)
  70. GRB000301c optical observations
  71. GRB 000301A, Radio Observations
  72. GRB000301C, optical observations
  73. GRB000301c, near-infrared observations
  74. Radio observations of the error box of GRB000301A
  75. HST Observations of GRB 990712
  76. GRB 000214 near-IR observations
  77. GRB 000115 Optical observations
  78. GRB 000214, Radio Observations
  79. GRB000210, Radio Observations
  80. Optical observations of GRB000210
  81. GRB 000210: BATSE Observations
  82. Optical observations of the Chandra X-ray source for GRB000210
  83. GRB000210, Radio Observations
  84. Optical candidate for GRB000210
  85. Chandra Observations of GRB000210 X-ray Afterglow
  86. GRB000201, Radio Observations
  87. Optical observations of GRB000131
  88. GRB000201 Optical Observations
  89. GRB 000201: TAROT optical observations
  90. GRB 000131 Optical Observations
  91. GRB000126 Optical Observations
  92. GRB 991208, radio observations
  93. GRB 000126, optical observations
  94. GRB000126, optical observations
  95. GRB 000115 Optical observations
  96. BATSE Observations of GRB000115
  97. GRB991216, UBVRIJHK field photometry
  98. GRB991216 late optical observation
  99. GRB 991216 VLBA Observations
  100. IPN error boxes for GRB991229

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