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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"

43000 results found.

  1. PROMPT Rc Observations of GRB 050709
  2. GRB 050525a: PROMPT VRcIc Detections
  3. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  4. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  5. GRB 050626: Swift XRT observations
  6. GRB 050701
  7. GRB 050701, optical observations
  8. GRB 050408: ARC 3.5-meter NIR Observations
  9. GRB 050701: Refined XRT analysis
  10. Swift UVOT observations of GRB 050701
  11. GRB050701: Swift-BAT Refined analysis
  12. GRB 050701: Swift XRT afterglow position
  13. Swift trigger 143708 is really GRB 050701
  14. GRB 050607, radio observations
  15. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  16. GRB 050626 - Correction to GCN 3552
  17. GRB 050626 - a long GRB detected with INTEGRAL
  18. GRB050525a: HST Observations
  19. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  20. H3804: A Possible New XRB Detected by HETE
  21. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  22. Konus-Wind observation of an intermediate burst from SGR 1806-20
  23. IBAS Alert #2512 is NOT a GRB
  24. XRF050509c: Radio Detection
  25. GRB 050416(a): Host Galaxy Redshift Determination
  26. GRB 050607: MDM Observation
  27. GRB 050607 optical decay
  28. GRB 050607: RTT150 optical observations
  29. GRB050607: refined analysis of prompt REM observations
  30. Swift/UVOT observations of GRB050607
  31. GRB 050607: PROMPT VRcIc Observations
  32. GRB 050607: RAPTOR-S Early Optical Limits
  33. GRB050607: KAIT optical limits
  34. GRB 050525a, Mid-Infrared Observations
  35. GRB 050607: Optical decay and spectral slope
  36. GRB 050607: MDM Observations
  37. GRB 050607 - XRT refined data analysis
  38. GRB050607 optical limit by "Pi of the Sky"
  39. GRB050607: P60 Observations
  40. GRB050607: prompt REM observations
  41. GRB 050603: prediction of t_break
  42. Limits on a SN in the field of GRB 050509b
  43. GRB 050603: Redshift
  44. GRB 050603 - XRT data analysis of the first day
  45. Konus-Wind observation of GRB 050603
  46. GRB 050603: Analysis of UVOT data
  47. GRB050603, submillimetre observations
  48. GRB 050603: Swift XRT Position
  49. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  50. GRB 050603: Afterglow Identification from LCO
  51. GRB 050603: INTEGRAL shows it is not a short GRB
  52. Swift/BAT Detection of GRB050603
  53. GRB 050408: jet break in the XRT light curve
  54. GRB 050525a, infrared observations
  55. GRB 050525a, SMARTS optical/IR afterglow observations
  56. GRB050528, XRT observations
  57. Swift-BAT GRB 050528: a soft burst
  58. Update on Swift-BAT GRB 050528 (Trigger 130679)
  59. GRB050528: BOOTES optical candidate (retraction)
  60. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  61. GRB050528: BOOTES optical candidate
  62. Possible GRB050528: no candidate from Liverpool Telescope
  63. Swift-BAT detection of possible GRB 050528
  64. GRB050525a: Radio Observations
  65. GRB 050509b: refined XRT/Chandra afterglow position analysis
  66. GRB 050525: RTT150, Optical observations
  67. GRB050525a: optical upper limits
  68. GRB 050525a: SARA Observations
  69. GRB 050525B: Swift-BAT observations
  70. GRB 050525: MITSuME Optical Observation in VRI
  71. GRB 050525a: MDM Observations
  72. GRB050525A,optical observation
  73. GRB 050525 : Lulin optical afterglow observations
  74. GRB050525: Super-LOTIS observations
  75. GRB 050525, spectral lag pseudo-redshift
  76. GRB 050525a: Gemini/GMOS Spectra
  77. GRB 050525: BART optical observation
  78. GRB 050525A: BOOTES simultaneous optical observations
  79. GRB 050525A: Swift-BAT refined analysis
  80. GRB050525: Optical observations
  81. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  82. Swift/UVOT UV and optical detections of GRB 050525
  83. Konus-Wind observation of GRB 050525
  84. GRB 050525: TAROT observations of the early afterglow
  85. INTEGRAL detection of GRB 050525
  86. GRB 050525, infrared observations
  87. GRB 050525: Optical observation
  88. GRB 050525: observatons of the optical afterglow
  89. GRB050525: ROTSE-III Refined Analysis
  90. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  91. XRF050522: NIR observations of XRT candidate
  92. XRF 050522: Swift XRT refined analysis
  93. Swift/UVOT observation of XRF 050522
  94. GRB 050509A: Further I-band imaging
  95. XRF 050522: Continued NIR P200 Monitoring
  96. RBO Observations of GRB050522
  97. GRB050509b: optical observations
  98. Recent GRB BVRcIc field photometry
  99. GRB050520: Radio Observations
  100. XRF 050522: Swift XRT observation

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