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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"

37755 results found.

  1. GRB 050701: Swift XRT afterglow position
  2. Swift trigger 143708 is really GRB 050701
  3. GRB 050607, radio observations
  4. GRB 050626 - Correction to GCN 3552
  5. GRB 050626 - a long GRB detected with INTEGRAL
  6. GRB 050525A: Swift Late-Time Decay Rate
  7. H3804: A Possible New XRB Detected by HETE
  8. XRF 050509c: Optical monitoring
  9. IBAS Alert #2512 is NOT a GRB
  10. GRB 050416(a): Host Galaxy Redshift Determination
  11. GRB 050607: MDM Observation
  12. GRB 050607 optical decay
  13. GRB 050607: RTT150 optical observations
  14. GRB 050607 : Lulin R-band observation
  15. GRB 050607: PROMPT VRcIc Observations
  16. GRB 050607: RAPTOR-S Early Optical Limits
  17. GRB 050525a, Mid-Infrared Observations
  18. GRB 050607: Optical decay and spectral slope
  19. GRB 050607: MDM Observations
  20. GRB050607,optical observation
  21. GRB 050607 - XRT refined data analysis
  22. Optical Afterglow of GRB 050607
  23. GRB050607 optical limit by "Pi of the Sky"
  24. GRB050607: Swift Detection of a long GRB
  25. GRB050607: P60 Observations
  26. GRB 050603: prediction of t_break
  27. Limits on a SN in the field of GRB 050509b
  28. GRB 050603: Redshift
  29. GRB 050603 - XRT data analysis of the first day
  30. Konus-Wind observation of GRB 050603
  31. GRB 050603: Analysis of UVOT data
  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. GRB 050408: jet break in the XRT light curve
  38. GRB 050525a, infrared observations
  39. GRB 050525a, SMARTS optical/IR afterglow observations
  40. Correction to GCN Circ 3502 on GRB 050528
  41. GRB050528: updated Liverpool Telescope limits
  42. Swift-BAT GRB 050528: a soft burst
  43. Update on Swift-BAT GRB 050528 (Trigger 130679)
  44. GRB050528: BOOTES optical candidate (retraction)
  45. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  46. GRB050528: BOOTES optical candidate
  47. Possible GRB050528: no candidate from Liverpool Telescope
  48. Swift-BAT detection of possible GRB 050528
  49. GRB050525a: Radio Observations
  50. GRB 050509b: refined XRT/Chandra afterglow position analysis
  51. GRB 050525: RTT150, Optical observations
  52. GRB050525a: optical upper limits
  53. GRB 050525a: SARA Observations
  54. GRB 050525B: Swift-BAT observations
  55. GRB 050525: MITSuME Optical Observation in VRI
  56. GRB 050525a: MDM Observations
  57. GRB050525A,optical observation
  58. GRB 050525 : Lulin optical afterglow observations
  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 050525: BART optical observation
  64. GRB 050525A: BOOTES simultaneous optical observations
  65. GRB 050525A: Swift-BAT refined analysis
  66. GRB050525: Optical observations
  67. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  68. GRB 050525: pseudo-redshift
  69. Swift/UVOT UV and optical detections of GRB 050525
  70. Konus-Wind observation of GRB 050525
  71. GRB 050525: TAROT observations of the early afterglow
  72. INTEGRAL detection of GRB 050525
  73. GRB 050525, infrared observations
  74. GRB 050525: Optical observation
  75. GRB 050525: observatons of the optical afterglow
  76. GRB050525: ROTSE-III Refined Analysis
  77. GRB 050525 - Very Bright, Not Short
  78. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  79. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  80. XRF050522: NIR observations of XRT candidate
  81. XRF050522: Radio Observations
  82. GRB 050509A: Further I-band imaging
  83. GRB050522,optical observation
  84. GRB050520,optical observation
  85. XRF 050522: Continued NIR P200 Monitoring
  86. RBO Observations of GRB050522
  87. GRB050509b: optical observations
  88. Recent GRB BVRcIc field photometry
  89. GRB050520: Radio Observations
  90. XRF050522, BVRcIc field photometry
  91. XRF050522: Optical Observations
  92. XRF 050522: KAIT observations
  93. XRF 050522 detected with INTEGRAL
  94. GRB 050520: VLT/ULTRACAM observations
  95. Swift UVOT Observations of GRB 050520
  96. GRB 050520: Swift XRT refined analysis
  97. RBO Observations of GRB050520
  98. GRB 050520: P200 Observations
  99. GRB050520: Liverpool Telescope follow-up
  100. GRB 050520: TAROT optical limit

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