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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.

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

19254 results found.

  1. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  2. GRB 031203: Apparent Spectral Break
  3. GRB 031203: IR REM Observations
  4. GRB 031203: further analysis of INTEGRAL data
  5. IPN triangulation of GRB031114 (large error box)
  6. XRF031109 (=H2919): A very long XRF localized by HETE
  7. IPN triangulation of GRB031108 (large error box)
  8. GRB030929/SN2003jd association unlikely based on IPN localiztion
  9. IPN triangulation of GRB031027 (small error box)
  10. Lulin optical follow-up observations of GRB031026
  11. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  12. IPN triangulation of GRB031024 (single error box)
  13. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  14. IPN triangulation of GRB031024 (annulus)
  15. IPN triangulation of GRB031020 (large error box)
  16. HETE Prompt GRB Light Curves and Color-Color Diagrams
  17. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  18. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  19. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  20. XRF 030824: observations at CFHT
  21. IPN triangulation of GRB030926 (short/hard; large error box)
  22. IPN triangulation of GRB030922B (large error box)
  23. XRF 030723: Detection of the likely host galaxy
  24. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  25. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  26. IPN triangulation of GRB030921 (large error box)
  27. IPN triangulation of GRB030919 (large error box)
  28. GRB 030913: ROTSE-3c Optical Observations
  29. GRB030913: AAVSO optical observations
  30. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  31. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  32. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  33. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  34. IPN triangulation of GRB030903 (large error box)
  35. IBAS detection of bursts from SGR 1806-20
  36. IPN triangulation of GRB030827 (large error box)
  37. GRB030823: optical observations
  38. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  39. IPN detection of continued activity from SGR1806-20
  40. 030813 SGR event (Konus-Wind observation)
  41. SGR 1808-20 (=H2802): A Possible new SGR
  42. IPN triangulation of GRB030808 (two large error boxes)
  43. IPN triangulation of GRB030806 (large burst; large error box)
  44. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  45. XRF 030723: Detection of a rebrightening in the optical afterglow
  46. IPN triangulation of GRB030801 (large error box)
  47. GRB021206 optical counterpart upper limit
  48. GRB 030725: optical observations.
  49. IPN triangulation of GRB030726 (large error box)
  50. IPN triangulation of GRB030721 (large error box)
  51. XRF 030723: confirmation of fading optical counterpart
  52. XRF030723(=H2777): Chandra Observations
  53. GRB030725 (=H2779): A Bright GRB Localized by HETE
  54. XRF030723 (= H2777): Chandra Observations Scheduled
  55. XRF030723, optical observations
  56. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  57. Konus-Wind detection of the bursts from SGR1806-20 region
  58. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  59. IPN triangulation of GRB030717 (annulus)
  60. IPN triangulation of GRB030714 (two large error boxes)
  61. IPN triangulation of GRB030715 (two large error boxes)
  62. IPN detection of renewed activity from SGR1806-20
  63. GRB030706 triangulation (single large error box)
  64. GRB030329, optical observation in May
  65. IPN triangulation of GRB030626 (single large error box)
  66. IPN triangulation of GRB030626 (two large error boxes)
  67. GRB030329: second XMM-Newton observation
  68. GRB030329 -- RATAN-600 data in April-May
  69. Final IPN error ellipse for GRB021206 (the polarized GRB)
  70. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  71. IPN triangulation of GRB030606 (two alternate error boxes)
  72. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  73. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  74. GRB 030528: tentative NIR counterpart
  75. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  76. GRB030329, SPM optical observations
  77. GRB030528: Chandra TOO Planned
  78. GRB030528(=H2724): Revised SXC Localization
  79. GRB030528 (H2724): A long GRB localized by HETE
  80. GRB 030329: Correction to GCN 2254
  81. GRB 030329: Optical Observations
  82. GRB 030416: Optical Observations
  83. GRB030329, Optical observations
  84. GRB030329: XMM-Newton observation
  85. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  86. IPN triangulation of GRB030519B=H2716 (small error box)
  87. HETE GRB030329, correction to Rc Observations in Loiano
  88. IPN triangulation of GRB030509B (annulus)
  89. IPN triangulation of GRB030509 (small errror box)
  90. IPN triangulation of GRB030509 - correction
  91. IPN triangulation of GRB030509 (single error box)
  92. GRB030329, BVRI photometry
  93. GRB030429, refiend optical brightness
  94. GRB 030329: Optical limit (contemporaneous photography)
  95. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  96. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  97. GRB030429: RTT150 optical observations, a possible host galaxy
  98. GRB030501, optical observation
  99. GRB030501 triangulation (correction to GCN 2194)
  100. GRB030329: RTT150 optical observations and upper limit for a host

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