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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"

28229 results found.

  1. INTEGRAL detection of activity from SGR1806-20
  2. RXTE GRB040229 optical observation: no candidate
  3. GRB 040228 Optical observations
  4. GRB040228 : KISO optical follow-up observation
  5. GRB 040223: Deep NIR NTT observations
  6. GRB 040223 : Optical observation (non-detection)
  7. XMM-Newton Images of GRB 040223
  8. GRB 040223, VLA observations
  9. GRB 040223: REM IJK Observations
  10. GRB 040223 XMM-Newton observation ...
  11. GRB 031203 XMM-Newton observation
  12. GRB 040223: further offline analysis
  13. GRB031111, optical observations
  14. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  15. GRB031203: Chandra Observations
  16. GRB040106: refined X-ray transient position
  17. SN 2003dh/GRB030329 late-time optical spectroscopy
  18. GRB 031220: Optical observations of Chandra X-ray sources
  19. XMM-Newton Images of GRB 040106
  20. GRB031220: observation at Univercity of Miyazaki
  21. XMM-Newton observation of GRB040106
  22. GRB 040106 : peak flux
  23. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  24. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  25. GRB031220: Palomar Observations
  26. GRB 031220 : Kyoto Optical Observation
  27. GRB 031220: Subaru observation
  28. GRB 031220: Optical observation at Tokyo Tech
  29. GRB 2974 follow-up observations
  30. GRB031203, improved XMM position
  31. GRB 021203: A Normal GRB viewed far off axis?
  32. XMM-Newton Observations of GRB031203: Preliminary Images
  33. GRB 031203: Variable Radio Source
  34. GRB 031203: Magellan spectrum of possible GRB host
  35. GRB 031203: Optical/IR Astrometry
  36. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  37. XMM-Newton Observation of GRB031203
  38. GRB031203: K' Photometry of the likely GRB host
  39. XMM-Newton Observation of GRB031203
  40. GRB 031203: IR NTTobservations do not confirm REM detection
  41. GRB031203 : Optical Observation of Lulin Observatory
  42. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  43. GRB 031203: Apparent Spectral Break
  44. GRB031203: Planned XMM-Newton observation II
  45. GRB 031203: IR REM Observations
  46. GRB031203: Optical Observations
  47. GRB 031203 XMM-Newton observation
  48. GRB031203: Planned XMM-Newton observation
  49. GRB 031203: further analysis of INTEGRAL data
  50. GRB 030329: Planned XMM-Newton Observation
  51. GRB 031111B (= H2925) : Kyoto Optical Observation
  52. IPN triangulation of GRB031114 (large error box)
  53. GRB 031111, optical observations
  54. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  55. GRB030929/SN2003jd association unlikely based on IPN localiztion
  56. IPN triangulation of GRB031027 (small error box)
  57. Lulin optical follow-up observations of GRB031026
  58. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  59. IPN triangulation of GRB031024 (single error box)
  60. IPN triangulation of GRB031024 (annulus)
  61. IPN triangulation of GRB031020 (large error box)
  62. XRF 030824: additional observations at CFHT
  63. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  64. XRF 030723: Subaru Optical Observations
  65. XRF 030824: Early follow-up observation at Kiso observatory
  66. XRF 030824: observations at CFHT
  67. IPN triangulation of GRB030922B (large error box)
  68. XRF 030723: Detection of the likely host galaxy
  69. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  70. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  71. IPN triangulation of GRB030921 (large error box)
  72. IPN triangulation of GRB030919 (large error box)
  73. GRB030913: Subaru Optical Observations
  74. GRB 030913, optical candidate
  75. GRB 030913, BOOTES observations
  76. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  77. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  78. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  79. XRF030824: Optical observations
  80. IPN triangulation of GRB030903 (large error box)
  81. IPN triangulation of GRB030827 (large error box)
  82. GRB030823: optical observations
  83. GRB030823: optical observation at Tokyo Tech
  84. Lulin follow-up observations of GRB030823
  85. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  86. IPN detection of continued activity from SGR1806-20
  87. GRB 030817 = H2808 TAROT optical observations
  88. SGR 1808-20 (=H2802): A Possible new SGR
  89. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  90. XRF 030723: Detection of a rebrightening in the optical afterglow
  91. XRF030723, BVRcIc field photometry update
  92. IPN triangulation of GRB030801 (large error box)
  93. GRB021206 optical counterpart upper limit
  94. IPN triangulation of GRB030726 (large error box)
  95. IPN triangulation of GRB030721 (large error box)
  96. XRF030723 Radio Observations
  97. XRF 030723: confirmation of fading optical counterpart
  98. XRF030723(=H2777): Chandra Observations
  99. GRB030723: Upper limits from historical observations
  100. XRF030723: Palomar observations and proposed counterpart

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