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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"

42294 results found.

  1. GRB031203 : Optical Observation of Lulin Observatory
  2. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  3. GRB 031203: Apparent Spectral Break
  4. GRB031203: Planned XMM-Newton observation II
  5. GRB 031203: IR REM Observations
  6. GRB031203: Optical Observations
  7. GRB 031203 XMM-Newton observation
  8. GRB 031203: Optical/IR SMARTS Observations
  9. GRB031203: Planned XMM-Newton observation
  10. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  11. GRB 031203: A long GRB detected with INTEGRAL
  12. IPN triangulation of GRB031130 (large error box)
  13. GRB031111A, prompt optical observations
  14. GRB 031111B (= H2925) : Kyoto Optical Observation
  15. IPN/HETE localization of GRB031109 (=H2917; large error box)
  16. IPN detection of activity from SGR1806-20
  17. GRB 031111, Radio observations
  18. GRB 031111: Optical observations
  19. GRB 031111, optical observations
  20. SN 2003jd (SN/GRB?) -- X-ray Observations
  21. HETE Prompt GRB Spectral Analyses
  22. IPN triangulation of GRB031111 (=H2924): small error box
  23. XRF031109 (=H2919): A very long XRF localized by HETE
  24. IPN triangulation of GRB031108 (large error box)
  25. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  26. GRB030929/SN2003jd association unlikely based on IPN localiztion
  27. Lulin optical follow-up observations of GRB031026
  28. SN 2003jd (SN/GRB?), Radio Observations
  29. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  30. GRB 031026: Further Ic Observations
  31. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  32. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  33. IPN triangulation of GRB031024 (single error box)
  34. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  35. GRB 031026: Ic Observations
  36. GRB031026 : KISO optical follow-up observation
  37. GRB030329: radio observations at RT-22 (CrAO)
  38. HETE Prompt GRB Light Curves and Color-Color Diagrams
  39. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  40. XRF 030824: additional observations at CFHT
  41. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  42. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  43. IPN detection of continued activity from SGR1806-20
  44. XRF 030723: Subaru Optical Observations
  45. A burst from SGR 1806-20 detected with IBAS
  46. XRF 030824: Early follow-up observation at Kiso observatory
  47. XRF 030824: observations at CFHT
  48. IPN triangulation of GRB030926 (short/hard; large error box)
  49. XRF 030723: Detection of the likely host galaxy
  50. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  51. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  52. IPN triangulation of GRB030922A (large error box)
  53. GRB030913: Subaru Optical Observations
  54. GRB 030913: ROTSE-3c Optical Observations
  55. GRB030913: OT's limit by MASTER
  56. GRB030913, candidate afterglow observations
  57. GRB 030913, optical candidate
  58. GRB030913: AAVSO optical observations
  59. GRB 030913, BOOTES observations
  60. GRB030913 (=H2849): Confirmation of the Flight Localization
  61. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  62. Magellan Observations of GRB030725 (=H2779)
  63. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  64. GRB 030913: Optical limit at RIKEN
  65. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  66. XRF030824: Optical observations
  67. IPN triangulation of GRB030903 (large error box)
  68. IBAS detection of bursts from SGR 1806-20
  69. Radio Observations of SGR1806-20
  70. IPN triangulation of GRB030827 (large error box)
  71. GRB 030823 observation at Ouda
  72. XRF030824: Second-epoch Palomar observations
  73. XRF030824: optical observations
  74. GRB030823: optical observations
  75. GRB030823: Palomar observations
  76. XRF030824: Palomar observations
  77. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  78. GRB030823: optical observation at Tokyo Tech
  79. RAPTOR observations of GRB030823
  80. Lulin follow-up observations of GRB030823
  81. IPN triangulation of GRB030821 (=H2814; refined error box)
  82. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  83. IPN triangulation of GRB030814 (annulus)
  84. IPN detection of continued activity from SGR1806-20
  85. 030813 SGR event (Konus-Wind observation)
  86. GRB 030817 = H2808 TAROT optical observations
  87. SGR 1808-20 (=H2802): A Possible new SGR
  88. GRB 021206 Optical Observations
  89. IPN triangulation of GRB030806 (large burst; large error box)
  90. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  91. IPN/HETE summary of recent bursts from SGR1806-20
  92. XRF 030723: Detection of a rebrightening in the optical afterglow
  93. GRB030725: Optical observations
  94. XRF030723, BVRcIc field photometry update
  95. GRB021206 optical counterpart upper limit
  96. XRF030723: Re-analysis of ROTSE-III early images
  97. IPN triangulation of GRB030725 (=H2779; small error box)
  98. XRF030723 (=H2777): Second Epoch Magellan Observations
  99. GRB 030725: optical observations.
  100. GRB030725, optical transient observations

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