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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"

43683 results found.

  1. GRB050525a: HST Observations
  2. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  3. H3804: A Possible New XRB Detected by HETE
  4. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  5. XRF 050509c: Optical monitoring
  6. Konus-Wind observation of an intermediate burst from SGR 1806-20
  7. IBAS Alert #2512 is NOT a GRB
  8. XRF050509c: Radio Detection
  9. GRB 050416(a): Host Galaxy Redshift Determination
  10. GRB 050607: MDM Observation
  11. GRB 050607 optical decay
  12. GRB 050607: RTT150 optical observations
  13. GRB050607: refined analysis of prompt REM observations
  14. Swift/UVOT observations of GRB050607
  15. GRB 050607: PROMPT VRcIc Observations
  16. GRB050607: KAIT optical limits
  17. GRB 050525a, Mid-Infrared Observations
  18. GRB 050607: Optical decay and spectral slope
  19. GRB 050607 - XRT refined data analysis
  20. Optical Afterglow of GRB 050607
  21. GRB050607: Swift Detection of a long GRB
  22. GRB050607: P60 Observations
  23. GRB050607: prompt REM observations
  24. GRB 050603: prediction of t_break
  25. Limits on a SN in the field of GRB 050509b
  26. GRB 050603: Redshift
  27. GRB 050603 - XRT data analysis of the first day
  28. Konus-Wind observation of GRB 050603
  29. GRB 050603: Analysis of UVOT data
  30. GRB050603: Fading Afterglow observed by Swift UVOT
  31. GRB050603, submillimetre observations
  32. GRB 050603: Swift XRT Position
  33. GRB050603: Radio Detection
  34. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  35. GRB 050603: Afterglow Identification from LCO
  36. GRB 050603: INTEGRAL shows it is not a short GRB
  37. Swift/BAT Detection of GRB050603
  38. GRB 050408: jet break in the XRT light curve
  39. GRB 050525a, infrared observations
  40. GRB 050525a, SMARTS optical/IR afterglow observations
  41. GRB050528, XRT observations
  42. GRB050528: updated Liverpool Telescope limits
  43. Swift-BAT GRB 050528: a soft burst
  44. Update on Swift-BAT GRB 050528 (Trigger 130679)
  45. GRB050528: BOOTES optical candidate (retraction)
  46. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  47. GRB050528: BOOTES optical candidate
  48. Possible GRB050528: no candidate from Liverpool Telescope
  49. Swift-BAT detection of possible GRB 050528
  50. GRB050525a: Radio Observations
  51. GRB 050509b: refined XRT/Chandra afterglow position analysis
  52. GRB 050525: RTT150, Optical observations
  53. GRB050525a: optical upper limits
  54. GRB 050525a: SARA Observations
  55. GRB 050525B: Swift-BAT observations
  56. GRB 050525: MITSuME Optical Observation in VRI
  57. GRB 050525a: MDM Observations
  58. GRB050525A,optical observation
  59. GRB050525: Super-LOTIS observations
  60. GRB 050525, spectral lag pseudo-redshift
  61. GRB 050525a: Gemini/GMOS Spectra
  62. GRB050306: optical afterglow not confirmed
  63. GRB 050525A: BOOTES simultaneous optical observations
  64. GRB 050525A: Swift-BAT refined analysis
  65. GRB050525: Optical observations
  66. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  67. GRB 050525: pseudo-redshift
  68. Swift/UVOT UV and optical detections of GRB 050525
  69. Konus-Wind observation of GRB 050525
  70. GRB 050525: TAROT observations of the early afterglow
  71. INTEGRAL detection of GRB 050525
  72. GRB 050525, infrared observations
  73. GRB 050525: Optical observation
  74. GRB 050525: observatons of the optical afterglow
  75. GRB050525: ROTSE-III Refined Analysis
  76. GRB 050525 - Very Bright, Not Short
  77. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  78. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  79. XRF050522: NIR observations of XRT candidate
  80. XRF 050522: Swift XRT refined analysis
  81. XRF050522: Radio Observations
  82. Swift/UVOT observation of XRF 050522
  83. GRB 050509A: Further I-band imaging
  84. GRB050522,optical observation
  85. GRB050520,optical observation
  86. XRF 050522: Continued NIR P200 Monitoring
  87. RBO Observations of GRB050522
  88. Recent GRB BVRcIc field photometry
  89. GRB050520: Radio Observations
  90. XRF 050522: Swift XRT observation
  91. XRF050522, BVRcIc field photometry
  92. XRF050522: Optical Observations
  93. XRF050522: Near-infrared Observations
  94. XRF 050522: KAIT observations
  95. XRF 050522 detected with INTEGRAL
  96. GRB 050520: VLT/ULTRACAM observations
  97. Swift UVOT Observations of GRB 050520
  98. GRB 050520: Swift XRT refined analysis
  99. XRF050509C: Chandra Afterglow Detection
  100. XRF 050509c: Swift XRT Upper Limit

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