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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"

23704 results found.

  1. Swift trigger 143708 is really GRB 050701
  2. GRB 050607, radio observations
  3. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  4. GRB 050626 - a long GRB detected with INTEGRAL
  5. GRB 050525A: Swift Late-Time Decay Rate
  6. GRB050525a: HST Observations
  7. H3804: A Possible New XRB Detected by HETE
  8. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  9. XRF 050509c: Optical monitoring
  10. Konus-Wind observation of an intermediate burst from SGR 1806-20
  11. XRF050509c: Radio Detection
  12. GRB 050416(a): Host Galaxy Redshift Determination
  13. GRB 050607: RTT150 optical observations
  14. GRB050607: refined analysis of prompt REM observations
  15. Swift/UVOT observations of GRB050607
  16. GRB 050607 : Lulin R-band observation
  17. GRB 050607: PROMPT VRcIc Observations
  18. GRB 050607: RAPTOR-S Early Optical Limits
  19. GRB050607: KAIT optical limits
  20. GRB 050525a, Mid-Infrared Observations
  21. GRB 050607 - XRT refined data analysis
  22. GRB050607: prompt REM observations
  23. Limits on a SN in the field of GRB 050509b
  24. GRB 050603 - XRT data analysis of the first day
  25. Konus-Wind observation of GRB 050603
  26. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  27. GRB 050408: jet break in the XRT light curve
  28. GRB050528, XRT observations
  29. Swift-BAT GRB 050528: a soft burst
  30. Update on Swift-BAT GRB 050528 (Trigger 130679)
  31. Swift-BAT detection of possible GRB 050528
  32. GRB 050509b: refined XRT/Chandra afterglow position analysis
  33. GRB 050525: RTT150, Optical observations
  34. GRB 050525a: SARA Observations
  35. GRB 050525B: Swift-BAT observations
  36. GRB 050525 : Lulin optical afterglow observations
  37. GRB 050525A: BOOTES simultaneous optical observations
  38. GRB 050525A: Swift-BAT refined analysis
  39. GRB050525: Optical observations
  40. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  41. Swift/UVOT UV and optical detections of GRB 050525
  42. Konus-Wind observation of GRB 050525
  43. GRB 050525: TAROT observations of the early afterglow
  44. INTEGRAL detection of GRB 050525
  45. GRB 050525: observatons of the optical afterglow
  46. GRB 050525 - Very Bright, Not Short
  47. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  48. XRF 050522: Swift XRT refined analysis
  49. GRB 050509A: Further I-band imaging
  50. GRB050509b: optical observations
  51. Recent GRB BVRcIc field photometry
  52. GRB050520: Radio Observations
  53. XRF 050522: Swift XRT observation
  54. XRF050522, BVRcIc field photometry
  55. XRF 050522 : Lulin observations
  56. XRF050522: Optical Observations
  57. XRF050522: Near-infrared Observations
  58. XRF 050522: KAIT observations
  59. XRF 050522 detected with INTEGRAL
  60. Swift UVOT Observations of GRB 050520
  61. GRB 050520: Swift XRT refined analysis
  62. XRF050509c: Radio Observations
  63. GRB 050520: P200 Observations
  64. GRB050520: Liverpool Telescope follow-up
  65. GRB 050520: TAROT optical limit
  66. GRB 050520: Swift XRT position
  67. GRB 050520: OSN optical observations
  68. GRB 050520 - A long GRB detected with INTEGRAL
  69. No Swift-BAT Lightcurves in real-time for next 3 weeks
  70. XRF 050509C: REM NIR and Optical refined analysis
  71. XRF 050509c optical afterglow
  72. GRB 050509B and short GRB-SN association? (corrected)
  73. GRB 050509B and short GRB-SN association?
  74. GRB 050509B: Subaru Optical Observations
  75. GRB050502b: Early Observation
  76. GRB050509b, Bok telescope B-band imaging
  77. GRB050509b, SDSS pre-burst observations
  78. GRB 050509b: Keck/Chandra Cross-Correlation
  79. GRB 050509b: Keck/Chandra Cross-Correlation
  80. GRB050509B: Optical/Infared observations
  81. GRB 050509b: Swift/UVOT follow-up measurements
  82. GRB050509B: Optical observations at the Very Large Telescope
  83. GRB 050509b: No Optical Variability in XRT Error Circle
  84. GRB 050509a: Swift-BAT refined analysis
  85. GRB 050505, early TAROT observation
  86. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  87. GRB050509c: REM NIR and Optical observations
  88. GRB 050505: SARA Observations
  89. Swift UVOT Follow-up Observations of GRB 050509B
  90. GRB 050509B, Optical Observations
  91. GRB 050509B: Swift/XRT refined analysis
  92. GRB050509a: Swift UVOT observations
  93. GRB 050509b: Optical observations
  94. GRB 050509b: Precision Astrometry
  95. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  96. GRB 050509A: Optical observations
  97. GRB 050509b: Optical Counterpart Candidate
  98. GRB050509b: Radio Observations
  99. GRB 050509b: PAIRITEL and WIYN Observations
  100. GRB 050509b: Swift-BAT refined analysis of the short hard burst

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