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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.

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"
body:"GRB"
submitter:"Judith Racusin"

23415 results found.

  1. XMM-Newton Observations of GRB031203: Preliminary Images
  2. IPN/HETE localization of GRB031203B (=H2949; large error box)
  3. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  4. XMM-Newton Observation of GRB031203
  5. XMM-Newton Observation of GRB031203
  6. GRB 031203: IR NTTobservations do not confirm REM detection
  7. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  8. GRB 031203: Apparent Spectral Break
  9. GRB031203: Planned XMM-Newton observation II
  10. GRB 031203: IR REM Observations
  11. GRB031203: Optical Observations
  12. GRB 031203 XMM-Newton observation
  13. GRB 031203: Optical/IR SMARTS Observations
  14. GRB031203: Planned XMM-Newton observation
  15. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  16. IPN triangulation of GRB031201 (large error box)
  17. IPN triangulation of GRB031130 (large error box)
  18. GRB 030329: Planned XMM-Newton Observation
  19. IPN triangulation of GRB031120 (two large error boxes)
  20. GRB 031111B (= H2925) : Kyoto Optical Observation
  21. IPN detection of activity from SGR1806-20
  22. IPN triangulation of GRB031114 (large error box)
  23. IPN triangulation of GRB031107 (two large error boxes)
  24. GRB 031111, optical observations
  25. IPN triangulation of GRB031111 (=H2924): small error box
  26. IPN triangulation of GRB031108 (large error box)
  27. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  28. GRB030929/SN2003jd association unlikely based on IPN localiztion
  29. IPN triangulation of GRB031027 (small error box)
  30. IPN triangulation of GRB031026B (large error box)
  31. Lulin optical follow-up observations of GRB031026
  32. SN 2003jd (SN/GRB?), Radio Observations
  33. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  34. GRB 031026: Further Ic Observations
  35. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  36. IPN triangulation of GRB031024 (single error box)
  37. GRB031026 : KISO optical follow-up observation
  38. IPN triangulation of GRB031024 (annulus)
  39. IPN triangulation of GRB031020 (large error box)
  40. GRB030329: radio observations at RT-22 (CrAO)
  41. IPN triangulation of GRB031016 (two large error boxes)
  42. IPN triangulation of GRB031014 (annulus)
  43. XRF 030824: additional observations at CFHT
  44. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  45. IPN triangulation of GRB031008 (annulus)
  46. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  47. IPN detection of continued activity from SGR1806-20
  48. IPN triangulation of GRB031007 (two large error boxes)
  49. XRF 030723: Subaru Optical Observations
  50. IPN triangulation of GRB031004B (annulus)
  51. IPN triangulation of GRB030929 (short/hard; annulus)
  52. XRF 030824: Early follow-up observation at Kiso observatory
  53. IPN triangulation of GRB030926 (short/hard; large error box)
  54. IPN triangulation of GRB030922B (large error box)
  55. XRF 030723: Detection of the likely host galaxy
  56. IPN triangulation of GRB030922A (large error box)
  57. IPN triangulation of GRB030921 (large error box)
  58. IPN triangulation of GRB030919 (large error box)
  59. GRB030922 triangulation (annulus)
  60. GRB030913: Subaru Optical Observations
  61. GRB030913: OT's limit by MASTER
  62. GRB030921 triangulation (annulus)
  63. GRB 030913, optical candidate
  64. GRB 030913, BOOTES observations
  65. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  66. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  67. IPN triangulation of GRB030908 (annulus)
  68. XRF030824: Optical observations
  69. IPN triangulation of GRB030903 (large error box)
  70. IBAS detection of bursts from SGR 1806-20
  71. IPN triangulation of GRB030831 (annulus)
  72. IPN triangulation of GRB030830 (large error box)
  73. IPN triangulation of GRB030827 (large error box)
  74. IPN triangulation of GRB030822 (annulus)
  75. GRB030823: optical observations
  76. GRB030823: optical observation at Tokyo Tech
  77. Lulin follow-up observations of GRB030823
  78. IPN triangulation of GRB030821 (=H2814; refined error box)
  79. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  80. IPN triangulation of GRB030814 (annulus)
  81. IPN detection of continued activity from SGR1806-20
  82. GRB 030817 = H2808 TAROT optical observations
  83. SGR 1808-20 (=H2802): A Possible new SGR
  84. IPN triangulation of GRB030808 (two large error boxes)
  85. IPN triangulation of GRB030806 (large burst; large error box)
  86. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  87. XRF030723, BVRcIc field photometry update
  88. IPN triangulation of GRB030801 (large error box)
  89. GRB021206 optical counterpart upper limit
  90. IPN triangulation of GRB030731 (annulus)
  91. IPN triangulation of GRB030725 (=H2779; small error box)
  92. IPN triangulation of GRB030726 (large error box)
  93. IPN triangulation of GRB030722 (large error box)
  94. IPN triangulation of GRB030721 (large error box)
  95. XRF030723 Radio Observations
  96. XRF 030723: confirmation of fading optical counterpart
  97. XRF030723(=H2777): Chandra Observations
  98. GRB030723: Upper limits from historical observations
  99. XRF030723: Palomar observations and proposed counterpart
  100. XRF030723, BVRcIc field photometry correction

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