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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

5512 results found.

  1. GRB 050306: further TAROT optical data
  2. GRB 050306: TAROT optical observations
  3. GRB 050306,optical observation
  4. GRB 050306: Swift-BAT detection of a long burst
  5. GRB050215B: Late-Time Swift UVOT Observations
  6. PROMPT VRcIc Observations of GRB 050223
  7. GRB050223: No Swift UVOT Detection of Afterglow Emission
  8. GRB050223: ROTSE-III Optical Observations
  9. GRB 050223 Swift/BAT detection of a burst
  10. GRB 050223: Swift XRT Position
  11. GRB 050215b: Swift XRT Observations
  12. GRB 050209 Optical observations
  13. GRB 050209: Optical observation
  14. GRB 050202: Short burst detected by Swift-BAT
  15. GRB 050129: a weak long GRB detected with INTEGRAL
  16. GRB050126: Burst Parameters Measured by BAT
  17. GRB 050126: Prompt XRT detection and localization
  18. GRB050124,optical observation
  19. GRB050124: Updated Swift XRT Position and Fluxes
  20. GRB050124: Swift-BAT position of a double-peaked burst
  21. GRB050117: Palomar WIRC Ks-band observations
  22. GRB050117b: Swift-BAT detection of a weak burst
  23. Second Epoch VLA observations of SGR 1806-20
  24. GRB041223: optical and NIR observations with REM
  25. GRB041219: Confirmed NIR Afterglow
  26. GRB 041218: Optical Observation
  27. GRB 041211: Infrared Observations
  28. GRB 041211: KAIT observations
  29. SGR 1806-20 still active
  30. GRB040929,optical observation
  31. XRF 040912, identification of CXO sources
  32. GRB040916 (= H3558): A Long XRF Localized by HETE
  33. IBAS GRB Alerts 1978-1980
  34. GRB040903 - A XRF?
  35. GRB040903, REM near-IR observation
  36. Possible GRB 040903 - further analysis
  37. Bursting activity from SGR 1806-20 detected with IBAS
  38. GRB 040730: a long GRB detected with INTEGRAL
  39. GRB040709 J,H-band observations
  40. IPN Summary of SGR1806-20 Activity in 2004
  41. GRB 040606: Optical observations
  42. Activivty of SGR 1806-20
  43. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  44. GRB 040403: Optical Observations
  45. GRB 040403 Optical Observations
  46. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  47. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  48. GRB031220: observation at Univercity of Miyazaki
  49. GRB 031220: Optical observation at Tokyo Tech
  50. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  51. GRB 2974 follow-up observations
  52. GRB 031203: Discovery of a dust echo
  53. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  54. GRB031203: Optical Observations
  55. GRB031203: Planned XMM-Newton observation
  56. Lulin optical follow-up observations of GRB031026
  57. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  58. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  59. IBAS detection of bursts from SGR 1806-20
  60. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  61. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  62. GRB030329: RTT150 optical observations
  63. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  64. GRB030418: R optical observations
  65. GRB030528 (H2724): A long GRB localized by HETE
  66. GRB030329, Optical observations
  67. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  68. GRB030429: RTT150 optical observations, a possible host galaxy
  69. GRB030329: RTT150 optical observations and upper limit for a host
  70. GRB030329: RTT150 optical observations and upper limit for a host
  71. GRB030501 localized by INTEGRAL
  72. GRB030329: optical polarization
  73. GRB030329: 444 AAVSO Measurements
  74. GRB 030329: SARA Optical Observations
  75. IPN triangulation of GRB030414 (small error box)
  76. GRB 030329: possible color change
  77. GRB030329: Kiso B and R band observations
  78. GRB030329: More AAVSO VR obs
  79. GRB030328: R upper limit after 6 hours by MASTER
  80. GRB 030329: SARA Optical Observations
  81. GRB 030329, BVRI photometry
  82. GRB030329: final R-band light curve by MASTER
  83. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  84. GRB 030329: SARA Optical Observations
  85. GRB 030329, BRI photometry
  86. Further AAVSO V,B,R observations of GRB030329
  87. GRB 030329: SARA Optical Observations
  88. GRB 030329: Observations with ANDICAM
  89. GRB030329: further optical photometry and evidence for a light curve discontinuity
  90. GRB 030329: Correction to GCN 2056
  91. AAVSO V & R observations of GRB030329
  92. GRB 030329: optical observations
  93. GRB030329 15 GHz radio observation
  94. 030331 NOT A GRB
  95. GRB030329: R and B observations
  96. GRB030329, SPM optical observations
  97. GRB 030329: Optical Decay
  98. GRB030329: optical spectroscopy with the TNG
  99. GRB 030328 Optical Observations
  100. GRB030328: Decay index

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