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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"

36139 results found.

  1. GRB 050525a, Mid-Infrared Observations
  2. GRB 050607: Optical decay and spectral slope
  3. GRB 050607: MDM Observations
  4. GRB050607,optical observation
  5. GRB 050607 - XRT refined data analysis
  6. Optical Afterglow of GRB 050607
  7. GRB050607 optical limit by "Pi of the Sky"
  8. GRB050607: Swift Detection of a long GRB
  9. GRB050607: P60 Observations
  10. GRB 050603: prediction of t_break
  11. Limits on a SN in the field of GRB 050509b
  12. GRB 050603: Redshift
  13. GRB 050603 - XRT data analysis of the first day
  14. Konus-Wind observation of GRB 050603
  15. GRB 050603: Analysis of UVOT data
  16. GRB 050603: Swift XRT Position
  17. GRB050603: Radio Detection
  18. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  19. GRB 050603: Afterglow Identification from LCO
  20. GRB 050603: INTEGRAL shows it is not a short GRB
  21. GRB 050408: jet break in the XRT light curve
  22. GRB 050525a, infrared observations
  23. GRB 050525a, SMARTS optical/IR afterglow observations
  24. Correction to GCN Circ 3502 on GRB 050528
  25. GRB050528: updated Liverpool Telescope limits
  26. Swift-BAT GRB 050528: a soft burst
  27. Update on Swift-BAT GRB 050528 (Trigger 130679)
  28. GRB050528: BOOTES optical candidate (retraction)
  29. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  30. GRB050528: BOOTES optical candidate
  31. Possible GRB050528: no candidate from Liverpool Telescope
  32. Swift-BAT detection of possible GRB 050528
  33. GRB050525a: Radio Observations
  34. GRB 050509b: refined XRT/Chandra afterglow position analysis
  35. GRB 050525: RTT150, Optical observations
  36. GRB050525a: optical upper limits
  37. GRB 050525a: SARA Observations
  38. GRB 050525B: Swift-BAT observations
  39. GRB 050525: MITSuME Optical Observation in VRI
  40. GRB 050525a: MDM Observations
  41. GRB050525A,optical observation
  42. GRB 050525 : Lulin optical afterglow observations
  43. GRB050525: Super-LOTIS observations
  44. GRB 050525, spectral lag pseudo-redshift
  45. GRB 050525a: Gemini/GMOS Spectra
  46. GRB050306: optical afterglow not confirmed
  47. GRB 050525: BART optical observation
  48. GRB 050525A: BOOTES simultaneous optical observations
  49. GRB 050525A: Swift-BAT refined analysis
  50. GRB050525: Optical observations
  51. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  52. GRB 050525: pseudo-redshift
  53. Swift/UVOT UV and optical detections of GRB 050525
  54. Konus-Wind observation of GRB 050525
  55. GRB 050525: TAROT observations of the early afterglow
  56. INTEGRAL detection of GRB 050525
  57. GRB 050525, infrared observations
  58. GRB 050525: Optical observation
  59. GRB 050525: observatons of the optical afterglow
  60. GRB050525: ROTSE-III Refined Analysis
  61. GRB 050525 - Very Bright, Not Short
  62. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  63. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  64. XRF050522: NIR observations of XRT candidate
  65. XRF050522: Radio Observations
  66. GRB 050509A: Further I-band imaging
  67. GRB050522,optical observation
  68. GRB050520,optical observation
  69. XRF 050522: Continued NIR P200 Monitoring
  70. RBO Observations of GRB050522
  71. GRB050509b: optical observations
  72. Recent GRB BVRcIc field photometry
  73. GRB050520: Radio Observations
  74. XRF050522, BVRcIc field photometry
  75. XRF050522: Optical Observations
  76. XRF 050522: KAIT observations
  77. XRF 050522 detected with INTEGRAL
  78. GRB 050520: VLT/ULTRACAM observations
  79. Swift UVOT Observations of GRB 050520
  80. GRB 050520: Swift XRT refined analysis
  81. RBO Observations of GRB050520
  82. GRB 050520: P200 Observations
  83. GRB050520: Liverpool Telescope follow-up
  84. GRB 050520: TAROT optical limit
  85. GRB 050520: Swift XRT position
  86. GRB 050520: VLT/ULTRACAM observations
  87. GRB 050520: OSN optical observations
  88. GRB 050520: BART optical limit
  89. GRB 050520 - A long GRB detected with INTEGRAL
  90. Swift-BAT trigger 122203 is not a real GRB
  91. GRB 050504: Swift XRT afterglow candidate has faded
  92. XRF 050509c optical afterglow
  93. GRB 050509B and short GRB-SN association? (corrected)
  94. GRB 050509B and short GRB-SN association?
  95. GRB 050509B: Subaru Optical Observations
  96. GRB050502b: Early Observation
  97. GRB050509b, Bok telescope B-band imaging
  98. Refined Chandra analysis of GRB 050509b
  99. GRB050509b, SDSS pre-burst observations
  100. GRB 050509b: Keck/Chandra Cross-Correlation

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