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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"

45470 results found.

  1. GRB 040106 : a long GRB detected with INTEGRAL
  2. IPN triangulation of an intermediate burst from SGR1806-20
  3. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  4. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  5. GRB031225a triangulation (annulus)
  6. IPN triangulation of GRB031219 (large error box)
  7. GRB031220: Palomar Observations
  8. GRB 031220 : Kyoto Optical Observation
  9. GRB 031220: Subaru observation
  10. GRB 031220: Optical observation at Tokyo Tech
  11. GRB031220: ROTSE-IIIb Optical Limits
  12. GRB031220 : Optical Observation of Lulin Observatory
  13. GRB 031203 I-band monitoring
  14. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  15. GRB 2974 follow-up observations
  16. GRB031203, improved XMM position
  17. GRB 031203: Discovery of a dust echo
  18. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  19. GRB030921 triangulation (annulus)
  20. GRB 031203: SMARTS optical monitoring
  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. IPN/HETE localization of GRB031203B (=H2949; large error box)
  27. GRB031203 K prime photometry: correction to galaxy coordinates
  28. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  29. XMM-Newton Observation of GRB031203
  30. GRB 031203: Deep NIR NTT & VLT observations
  31. GRB031203: K' Photometry of the likely GRB host
  32. XMM-Newton Observation of GRB031203
  33. GRB 031203: Radio detection
  34. GRB 031203: Further reports on December 4 observations
  35. GRB 031203: IR NTTobservations do not confirm REM detection
  36. GRB031203 : Optical Observation of Lulin Observatory
  37. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  38. GRB 031203: Apparent Spectral Break
  39. GRB031203: Planned XMM-Newton observation II
  40. GRB 031203: IR REM Observations
  41. GRB031203: Optical Observations
  42. GRB 031203 XMM-Newton observation
  43. GRB 031203: Optical/IR SMARTS Observations
  44. GRB031203: Planned XMM-Newton observation
  45. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  46. GRB 031203: further analysis of INTEGRAL data
  47. GRB 031203: A long GRB detected with INTEGRAL
  48. IPN triangulation of GRB031201 (large error box)
  49. IPN triangulation of GRB031130 (large error box)
  50. GRB031111A, prompt optical observations
  51. GRB 030329: Planned XMM-Newton Observation
  52. IPN triangulation of GRB031120 (two large error boxes)
  53. GRB 031111B (= H2925) : Kyoto Optical Observation
  54. IPN/HETE localization of GRB031109 (=H2917; large error box)
  55. IPN detection of activity from SGR1806-20
  56. GRB 031111, Radio observations
  57. IPN triangulation of GRB031114 (large error box)
  58. IPN triangulation of GRB031107 (two large error boxes)
  59. GRB 031111: Optical observations
  60. GRB 031111, optical observations
  61. SN 2003jd (SN/GRB?) -- X-ray Observations
  62. HETE Prompt GRB Spectral Analyses
  63. IPN triangulation of GRB031111 (=H2924): small error box
  64. XRF031109 (=H2919): A very long XRF localized by HETE
  65. IPN triangulation of GRB031108 (large error box)
  66. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  67. GRB030929/SN2003jd association unlikely based on IPN localiztion
  68. IPN triangulation of GRB031027 (small error box)
  69. IPN triangulation of GRB031026B (large error box)
  70. Lulin optical follow-up observations of GRB031026
  71. SN 2003jd (SN/GRB?), Radio Observations
  72. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  73. GRB 031026: Further Ic Observations
  74. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  75. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  76. IPN triangulation of GRB031024 (single error box)
  77. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  78. GRB 031026: Ic Observations
  79. GRB031026 : KISO optical follow-up observation
  80. IPN triangulation of GRB031024 (annulus)
  81. IPN triangulation of GRB031020 (large error box)
  82. GRB030329: radio observations at RT-22 (CrAO)
  83. IPN triangulation of GRB031016 (two large error boxes)
  84. IBAS alert 1180 refers to a burst from SGR 1806-20
  85. HETE Prompt GRB Light Curves and Color-Color Diagrams
  86. IPN triangulation of GRB031014 (annulus)
  87. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  88. XRF 030824: additional observations at CFHT
  89. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  90. IPN triangulation of GRB031008 (annulus)
  91. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  92. IPN detection of continued activity from SGR1806-20
  93. IPN triangulation of GRB031007 (two large error boxes)
  94. XRF 030723: Subaru Optical Observations
  95. IPN triangulation of GRB031004B (annulus)
  96. IPN triangulation of GRB031004A (short/hard; annulus)
  97. IPN triangulation of GRB030929 (short/hard; annulus)
  98. A burst from SGR 1806-20 detected with IBAS
  99. XRF 030824: Early follow-up observation at Kiso observatory
  100. XRF 030824: observations at CFHT

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