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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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10919 results found.

  1. GRB 040511: NIR observations with REM
  2. IBAS GRB Alerts n.1785 to 1791
  3. GRB 040511: Second Epoch Optical Observations
  4. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  5. IPN triangulation of GRB040425 (=H3183)
  6. On Line Availability of Archival HETE Fregate Data and Lightcurves
  7. GRB 040423 (=H3175): A Long GRB Localized by HETE
  8. IBAS GRB alerts 1739, 1740, 1741
  9. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  10. GRB 040403: Optical Observations
  11. GRB 040403: optical observations
  12. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  13. IBAS GRB Alert 1694
  14. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  15. GRB 040323: a long GRB detected with INTEGRAL
  16. IBAS GRB alerts 1679, 1680, 1681
  17. IBAS Alert 1678: not a GRB
  18. MASTER: RXTE GRB040308 optical observation
  19. IBAS results on a burst from SGR1806-20
  20. INTEGRAL detection of activity from SGR1806-20
  21. RXTE GRB040229 optical observation: no candidate
  22. IPN triangulation of GRB040228 (H3066, H3067)
  23. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  24. GRB 040223: Deep NIR NTT observations
  25. GRB 040223: REM IJK Observations
  26. GRB 040223: a long GRB detected with INTEGRAL
  27. Follow-up on IBAS GRB Alert 1379
  28. GRB040106: optical observations with REM+ROSS
  29. GRB 040106: Optical observations
  30. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  31. GRB 031220: Subaru observation
  32. GRB 031220: Optical observation at Tokyo Tech
  33. GRB031203, improved XMM position
  34. GRB 031203: Optical/IR Astrometry
  35. IPN/HETE localization of GRB031203B (=H2949; large error box)
  36. XMM-Newton Observation of GRB031203
  37. GRB031203: K' Photometry of the likely GRB host
  38. XMM-Newton Observation of GRB031203
  39. GRB 031203: IR NTTobservations do not confirm REM detection
  40. GRB 031203: IR REM Observations
  41. GRB 031203: A long GRB detected with INTEGRAL
  42. IPN triangulation of GRB031130 (large error box)
  43. IPN triangulation of GRB031120 (two large error boxes)
  44. GRB 031111B (= H2925) : Kyoto Optical Observation
  45. IPN/HETE localization of GRB031109 (=H2917; large error box)
  46. GRB 031111: Optical observations
  47. SN 2003jd (SN/GRB?) -- X-ray Observations
  48. HETE Prompt GRB Spectral Analyses
  49. IPN triangulation of GRB031111 (=H2924): small error box
  50. XRF031109 (=H2919): A very long XRF localized by HETE
  51. GRB030929/SN2003jd association unlikely based on IPN localiztion
  52. IPN triangulation of GRB031027 (small error box)
  53. Lulin optical follow-up observations of GRB031026
  54. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  55. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  56. XRF 030723: Subaru Optical Observations
  57. IPN triangulation of GRB031004A (short/hard; annulus)
  58. XRF 030824: observations at CFHT
  59. IPN triangulation of GRB030926 (short/hard; large error box)
  60. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  61. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  62. GRB030913: Subaru Optical Observations
  63. GRB030913: OT's limit by MASTER
  64. GRB030913 (=H2849): Confirmation of the Flight Localization
  65. Magellan Observations of GRB030725 (=H2779)
  66. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  67. IPN triangulation of GRB030822 (annulus)
  68. GRB030823: optical observation at Tokyo Tech
  69. IPN triangulation of GRB030821 (=H2814; refined error box)
  70. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  71. Summary of recent IPN and HETE detections of SGR bursts
  72. IPN triangulation of GRB030814 (annulus)
  73. 030813 SGR event (Konus-Wind observation)
  74. SGR 1808-20 (=H2802): A Possible new SGR
  75. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  76. IPN/HETE summary of recent bursts from SGR1806-20
  77. XRF030723: Re-analysis of ROTSE-III early images
  78. IPN triangulation of GRB030725 (=H2779; small error box)
  79. XRF030723 (=H2777): Second Epoch Magellan Observations
  80. IPN triangulation of GRB030726 (large error box)
  81. XRF 030723: confirmation of fading optical counterpart
  82. XRF030723(=H2777): Chandra Observations
  83. Magellan Observations of XRF030723 (=H2777)
  84. GRB030723: Upper limits from historical observations
  85. GRB030725, possible optical transient
  86. GRB030725 (=H2779): A Bright GRB Localized by HETE
  87. XRF030723 (= H2777): Chandra Observations Scheduled
  88. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  89. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  90. GRB030329: RTT150 optical observations
  91. IPN detection of renewed activity from SGR1806-20
  92. HETE detection of burst from SGR1806-20
  93. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  94. GRB 030528: Optical Observations
  95. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  96. GRB030528: Chandra TOO Planned
  97. GRB030528(=H2724): Revised SXC Localization
  98. GRB 030329: optical observations
  99. GRB030528 (H2724): A long GRB localized by HETE
  100. GRB 030329: HST ACS Observations of the Host

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