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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"

45719 results found.

  1. GRB050709, optical observations
  2. GRB050709: A Possible Short-Hard GRB Localized by HETE
  3. PROMPT Rc Observations of GRB 050709
  4. GRB 050525a: PROMPT VRcIc Detections
  5. GRB 050525a: ARC 3.5-meter Optical and NIR Observations
  6. GRB 050525a: ARC 3.5-Meter SPIcam Field Calibration
  7. GRB 050626 optical observations
  8. GRB 050626: Swift XRT observations
  9. GRB 050701
  10. GRB 050701, optical observations
  11. GRB 050408: ARC 3.5-meter NIR Observations
  12. GRB 050701: Refined XRT analysis
  13. Swift UVOT observations of GRB 050701
  14. GRB050701: Swift-BAT Refined analysis
  15. GRB 050701: Swift XRT afterglow position
  16. Swift trigger 143708 is really GRB 050701
  17. GRB 050607, radio observations
  18. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  19. GRB 050626 - Correction to GCN 3552
  20. GRB 050626 - a long GRB detected with INTEGRAL
  21. GRB 050525A: Swift Late-Time Decay Rate
  22. GRB050525a: HST Observations
  23. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  24. H3804: A Possible New XRB Detected by HETE
  25. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  26. XRF 050509c: Optical monitoring
  27. Konus-Wind observation of an intermediate burst from SGR 1806-20
  28. IBAS Alert #2512 is NOT a GRB
  29. XRF050509c: Radio Detection
  30. GRB 050416(a): Host Galaxy Redshift Determination
  31. GRB 050607: MDM Observation
  32. GRB 050607 optical decay
  33. GRB 050607: RTT150 optical observations
  34. GRB050607: refined analysis of prompt REM observations
  35. Swift/UVOT observations of GRB050607
  36. GRB 050607 : Lulin R-band observation
  37. GRB 050607: PROMPT VRcIc Observations
  38. GRB 050607: RAPTOR-S Early Optical Limits
  39. GRB050607: KAIT optical limits
  40. GRB 050525a, Mid-Infrared Observations
  41. GRB 050607: Optical decay and spectral slope
  42. GRB 050607: MDM Observations
  43. GRB050607,optical observation
  44. GRB 050607 - XRT refined data analysis
  45. Optical Afterglow of GRB 050607
  46. GRB050607 optical limit by "Pi of the Sky"
  47. GRB050607: Swift Detection of a long GRB
  48. GRB050607: P60 Observations
  49. GRB050607: prompt REM observations
  50. GRB 050603: prediction of t_break
  51. Limits on a SN in the field of GRB 050509b
  52. GRB 050603: Redshift
  53. GRB 050603 - XRT data analysis of the first day
  54. Konus-Wind observation of GRB 050603
  55. GRB 050603: Analysis of UVOT data
  56. GRB050603: Fading Afterglow observed by Swift UVOT
  57. GRB050603, submillimetre observations
  58. GRB 050603: Swift XRT Position
  59. GRB050603: Radio Detection
  60. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  61. GRB 050603: Afterglow Identification from LCO
  62. GRB 050603: INTEGRAL shows it is not a short GRB
  63. Swift/BAT Detection of GRB050603
  64. GRB 050408: jet break in the XRT light curve
  65. GRB 050525a, infrared observations
  66. GRB 050525a, SMARTS optical/IR afterglow observations
  67. GRB050528, XRT observations
  68. Correction to GCN Circ 3502 on GRB 050528
  69. GRB050528: updated Liverpool Telescope limits
  70. Swift-BAT GRB 050528: a soft burst
  71. Update on Swift-BAT GRB 050528 (Trigger 130679)
  72. GRB050528: BOOTES optical candidate (retraction)
  73. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  74. GRB050528: BOOTES optical candidate
  75. Possible GRB050528: no candidate from Liverpool Telescope
  76. Swift-BAT detection of possible GRB 050528
  77. GRB050525a: Radio Observations
  78. GRB 050509b: refined XRT/Chandra afterglow position analysis
  79. GRB 050525: RTT150, Optical observations
  80. GRB050525a: optical upper limits
  81. GRB 050525a: SARA Observations
  82. GRB 050525B: Swift-BAT observations
  83. GRB 050525: MITSuME Optical Observation in VRI
  84. GRB 050525a: MDM Observations
  85. GRB050525A,optical observation
  86. GRB 050525 : Lulin optical afterglow observations
  87. GRB050525: Super-LOTIS observations
  88. GRB 050525, spectral lag pseudo-redshift
  89. GRB 050525a: Gemini/GMOS Spectra
  90. GRB050306: optical afterglow not confirmed
  91. GRB 050525: BART optical observation
  92. GRB 050525A: BOOTES simultaneous optical observations
  93. GRB 050525A: Swift-BAT refined analysis
  94. GRB050525: Optical observations
  95. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  96. GRB 050525: pseudo-redshift
  97. Swift/UVOT UV and optical detections of GRB 050525
  98. Konus-Wind observation of GRB 050525
  99. GRB 050525: TAROT observations of the early afterglow
  100. INTEGRAL detection of GRB 050525

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