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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"

28119 results found.

  1. GRB 031203 XMM-Newton observation
  2. GRB 040223: further offline analysis
  3. GRB031111, optical observations
  4. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  5. GRB031203: Chandra Observations
  6. GRB040106: refined X-ray transient position
  7. SN 2003dh/GRB030329 late-time optical spectroscopy
  8. GRB 031220: Optical observations of Chandra X-ray sources
  9. XMM-Newton Images of GRB 040106
  10. GRB031220: observation at Univercity of Miyazaki
  11. XMM-Newton observation of GRB040106
  12. GRB 040106 : peak flux
  13. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  14. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  15. GRB031220: Palomar Observations
  16. GRB 031220 : Kyoto Optical Observation
  17. GRB 031220: Subaru observation
  18. GRB 031220: Optical observation at Tokyo Tech
  19. GRB 2974 follow-up observations
  20. GRB031203, improved XMM position
  21. GRB 021203: A Normal GRB viewed far off axis?
  22. XMM-Newton Observations of GRB031203: Preliminary Images
  23. GRB 031203: Variable Radio Source
  24. GRB 031203: Magellan spectrum of possible GRB host
  25. GRB 031203: Optical/IR Astrometry
  26. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  27. XMM-Newton Observation of GRB031203
  28. GRB031203: K' Photometry of the likely GRB host
  29. XMM-Newton Observation of GRB031203
  30. GRB 031203: IR NTTobservations do not confirm REM detection
  31. GRB031203 : Optical Observation of Lulin Observatory
  32. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  33. GRB 031203: Apparent Spectral Break
  34. GRB031203: Planned XMM-Newton observation II
  35. GRB 031203: IR REM Observations
  36. GRB031203: Optical Observations
  37. GRB 031203 XMM-Newton observation
  38. GRB031203: Planned XMM-Newton observation
  39. GRB 031203: further analysis of INTEGRAL data
  40. GRB 030329: Planned XMM-Newton Observation
  41. GRB 031111B (= H2925) : Kyoto Optical Observation
  42. IPN triangulation of GRB031114 (large error box)
  43. GRB 031111, optical observations
  44. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  45. GRB030929/SN2003jd association unlikely based on IPN localiztion
  46. IPN triangulation of GRB031027 (small error box)
  47. Lulin optical follow-up observations of GRB031026
  48. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  49. IPN triangulation of GRB031024 (single error box)
  50. IPN triangulation of GRB031024 (annulus)
  51. IPN triangulation of GRB031020 (large error box)
  52. XRF 030824: additional observations at CFHT
  53. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  54. XRF 030723: Subaru Optical Observations
  55. XRF 030824: Early follow-up observation at Kiso observatory
  56. XRF 030824: observations at CFHT
  57. IPN triangulation of GRB030922B (large error box)
  58. XRF 030723: Detection of the likely host galaxy
  59. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  60. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  61. IPN triangulation of GRB030921 (large error box)
  62. IPN triangulation of GRB030919 (large error box)
  63. GRB030913: Subaru Optical Observations
  64. GRB 030913, optical candidate
  65. GRB 030913, BOOTES observations
  66. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  67. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  68. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  69. XRF030824: Optical observations
  70. IPN triangulation of GRB030903 (large error box)
  71. IPN triangulation of GRB030827 (large error box)
  72. GRB030823: optical observations
  73. GRB030823: optical observation at Tokyo Tech
  74. Lulin follow-up observations of GRB030823
  75. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  76. IPN detection of continued activity from SGR1806-20
  77. GRB 030817 = H2808 TAROT optical observations
  78. SGR 1808-20 (=H2802): A Possible new SGR
  79. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  80. XRF 030723: Detection of a rebrightening in the optical afterglow
  81. XRF030723, BVRcIc field photometry update
  82. IPN triangulation of GRB030801 (large error box)
  83. GRB021206 optical counterpart upper limit
  84. IPN triangulation of GRB030726 (large error box)
  85. IPN triangulation of GRB030721 (large error box)
  86. XRF030723 Radio Observations
  87. XRF 030723: confirmation of fading optical counterpart
  88. XRF030723(=H2777): Chandra Observations
  89. GRB030723: Upper limits from historical observations
  90. XRF030723: Palomar observations and proposed counterpart
  91. GRB030725 (=H2779): A Bright GRB Localized by HETE
  92. XRF030723 (= H2777): Chandra Observations Scheduled
  93. XRF030723, BVRcIc field photometry correction
  94. XRF030723, ROTSE-III Early Observations
  95. XRF030723, BVRcIc field photometry
  96. XRF 030723, optical observations
  97. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  98. Konus-Wind detection of the bursts from SGR1806-20 region
  99. SGR 1806-20, submm observations
  100. RXTE PCA Observations of SGR1806-20 Region

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