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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').
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.

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

5513 results found.

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

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