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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.

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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"
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submitter:"Judith Racusin"

10922 results found.

  1. GRB 040624: optical observations at TNG and VLT
  2. IPN Summary of SGR1806-20 Activity in 2004
  3. SGR 1806-20: no IR variability of the proposed counterparts
  4. GRB 040511: NIR observations with REM
  5. IBAS GRB Alerts n.1785 to 1791
  6. GRB 040511: Second Epoch Optical Observations
  7. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  8. IPN triangulation of GRB040425 (=H3183)
  9. On Line Availability of Archival HETE Fregate Data and Lightcurves
  10. GRB 040423 (=H3175): A Long GRB Localized by HETE
  11. IBAS GRB alerts 1739, 1740, 1741
  12. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  13. GRB 040403: Optical Observations
  14. GRB 040403: optical observations
  15. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  16. IBAS GRB Alert 1694
  17. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  18. GRB 040323: a long GRB detected with INTEGRAL
  19. IBAS GRB alerts 1679, 1680, 1681
  20. IBAS Alert 1678: not a GRB
  21. MASTER: RXTE GRB040308 optical observation
  22. IBAS results on a burst from SGR1806-20
  23. INTEGRAL detection of activity from SGR1806-20
  24. RXTE GRB040229 optical observation: no candidate
  25. IPN triangulation of GRB040228 (H3066, H3067)
  26. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  27. GRB 040223: Deep NIR NTT observations
  28. GRB 040223: REM IJK Observations
  29. GRB 040223: a long GRB detected with INTEGRAL
  30. Follow-up on IBAS GRB Alert 1379
  31. GRB040106: optical observations with REM+ROSS
  32. GRB 040106: Optical observations
  33. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  34. GRB 031220: Subaru observation
  35. GRB 031220: Optical observation at Tokyo Tech
  36. GRB031203, improved XMM position
  37. GRB 031203: Optical/IR Astrometry
  38. IPN/HETE localization of GRB031203B (=H2949; large error box)
  39. XMM-Newton Observation of GRB031203
  40. GRB031203: K' Photometry of the likely GRB host
  41. XMM-Newton Observation of GRB031203
  42. GRB 031203: IR NTTobservations do not confirm REM detection
  43. GRB 031203: IR REM Observations
  44. GRB 031203: A long GRB detected with INTEGRAL
  45. IPN triangulation of GRB031130 (large error box)
  46. IPN triangulation of GRB031120 (two large error boxes)
  47. GRB 031111B (= H2925) : Kyoto Optical Observation
  48. IPN/HETE localization of GRB031109 (=H2917; large error box)
  49. GRB 031111: Optical observations
  50. SN 2003jd (SN/GRB?) -- X-ray Observations
  51. HETE Prompt GRB Spectral Analyses
  52. IPN triangulation of GRB031111 (=H2924): small error box
  53. XRF031109 (=H2919): A very long XRF localized by HETE
  54. GRB030929/SN2003jd association unlikely based on IPN localiztion
  55. IPN triangulation of GRB031027 (small error box)
  56. Lulin optical follow-up observations of GRB031026
  57. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  58. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  59. XRF 030723: Subaru Optical Observations
  60. IPN triangulation of GRB031004A (short/hard; annulus)
  61. XRF 030824: observations at CFHT
  62. IPN triangulation of GRB030926 (short/hard; large error box)
  63. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  64. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  65. GRB030913: Subaru Optical Observations
  66. GRB030913: OT's limit by MASTER
  67. GRB030913 (=H2849): Confirmation of the Flight Localization
  68. Magellan Observations of GRB030725 (=H2779)
  69. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  70. IPN triangulation of GRB030822 (annulus)
  71. GRB030823: optical observation at Tokyo Tech
  72. IPN triangulation of GRB030821 (=H2814; refined error box)
  73. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  74. Summary of recent IPN and HETE detections of SGR bursts
  75. IPN triangulation of GRB030814 (annulus)
  76. 030813 SGR event (Konus-Wind observation)
  77. SGR 1808-20 (=H2802): A Possible new SGR
  78. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  79. IPN/HETE summary of recent bursts from SGR1806-20
  80. XRF030723: Re-analysis of ROTSE-III early images
  81. IPN triangulation of GRB030725 (=H2779; small error box)
  82. XRF030723 (=H2777): Second Epoch Magellan Observations
  83. IPN triangulation of GRB030726 (large error box)
  84. XRF 030723: confirmation of fading optical counterpart
  85. XRF030723(=H2777): Chandra Observations
  86. Magellan Observations of XRF030723 (=H2777)
  87. GRB030723: Upper limits from historical observations
  88. GRB030725, possible optical transient
  89. GRB030725 (=H2779): A Bright GRB Localized by HETE
  90. XRF030723 (= H2777): Chandra Observations Scheduled
  91. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  92. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  93. GRB030329: RTT150 optical observations
  94. IPN detection of renewed activity from SGR1806-20
  95. HETE detection of burst from SGR1806-20
  96. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  97. GRB 030528: Optical Observations
  98. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  99. GRB030528: Chandra TOO Planned
  100. GRB030528(=H2724): Revised SXC Localization

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