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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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

42638 results found.

  1. GRB 040323, a dark GRB ?
  2. short hard GRB 040322
  3. GRB 040323: a long GRB detected with INTEGRAL
  4. IBAS GRB alerts 1679, 1680, 1681
  5. GRB040223: Deep NIR NTT data re-analysis
  6. GRB 040223: XMM-Newton results
  7. GRB040223, improved XMM position
  8. IBAS Alert 1678: not a GRB
  9. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  10. GRB 031203, possible supernova
  11. MASTER: RXTE GRB040308 optical observation
  12. IBAS results on a burst from SGR1806-20
  13. INTEGRAL detection of activity from SGR1806-20
  14. GRB 040228 Optical observations
  15. IPN triangulation of GRB040228 (H3066, H3067)
  16. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  17. GRB 040223: Deep NIR NTT observations
  18. GRB 040223 : Optical observation (non-detection)
  19. XMM-Newton Images of GRB 040223
  20. GRB 040223, VLA observations
  21. GRB 040223: REM IJK Observations
  22. GRB 040223 XMM-Newton observation ...
  23. GRB 031203 XMM-Newton observation
  24. GRB 040223: further offline analysis
  25. GRB 040223: a long GRB detected with INTEGRAL
  26. GRB031111, optical observations
  27. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  28. GRB031203: Chandra Observations
  29. GRB040106, follow-up radio observations
  30. GRB040106: refined X-ray transient position
  31. IBAS GRB alert 1379
  32. SN 2003dh/GRB030329 late-time optical spectroscopy
  33. GRB040106, Radio Observations
  34. GRB040106, likely optical afterglow
  35. GRB040106: Second Epoch Optical Observations
  36. GRB 031220: Optical observations of Chandra X-ray sources
  37. GRB040106: optical observations with REM+ROSS
  38. GRB031220: observation at Univercity of Miyazaki
  39. GRB 040106: Optical observations
  40. XMM-Newton observation of GRB040106
  41. GRB 040106 : peak flux
  42. GRB 040106 : a long GRB detected with INTEGRAL
  43. IPN triangulation of an intermediate burst from SGR1806-20
  44. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  45. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  46. GRB031225a triangulation (annulus)
  47. IPN triangulation of GRB031219 (large error box)
  48. GRB031220: Palomar Observations
  49. GRB 031220 : Kyoto Optical Observation
  50. GRB 031220: Optical observation at Tokyo Tech
  51. GRB 031203 I-band monitoring
  52. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  53. GRB 2974 follow-up observations
  54. GRB031203, improved XMM position
  55. GRB 031203: Discovery of a dust echo
  56. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  57. GRB030921 triangulation (annulus)
  58. GRB 021203: A Normal GRB viewed far off axis?
  59. GRB 031203: Variable Radio Source
  60. GRB 031203: Magellan spectrum of possible GRB host
  61. GRB 031203: Optical/IR Astrometry
  62. IPN/HETE localization of GRB031203B (=H2949; large error box)
  63. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  64. XMM-Newton Observation of GRB031203
  65. GRB 031203: Deep NIR NTT & VLT observations
  66. GRB031203: K' Photometry of the likely GRB host
  67. XMM-Newton Observation of GRB031203
  68. GRB 031203: Radio detection
  69. GRB 031203: IR NTTobservations do not confirm REM detection
  70. GRB031203 : Optical Observation of Lulin Observatory
  71. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  72. GRB 031203: Apparent Spectral Break
  73. GRB 031203: IR REM Observations
  74. GRB031203: Optical Observations
  75. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  76. GRB 031203: further analysis of INTEGRAL data
  77. GRB 031203: A long GRB detected with INTEGRAL
  78. IPN triangulation of GRB031201 (large error box)
  79. IPN triangulation of GRB031130 (large error box)
  80. GRB 030329: Planned XMM-Newton Observation
  81. IPN triangulation of GRB031120 (two large error boxes)
  82. GRB 031111B (= H2925) : Kyoto Optical Observation
  83. IPN/HETE localization of GRB031109 (=H2917; large error box)
  84. IPN detection of activity from SGR1806-20
  85. GRB 031111, Radio observations
  86. IPN triangulation of GRB031114 (large error box)
  87. IPN triangulation of GRB031107 (two large error boxes)
  88. GRB 031111: Optical observations
  89. GRB 031111, optical observations
  90. SN 2003jd (SN/GRB?) -- X-ray Observations
  91. HETE Prompt GRB Spectral Analyses
  92. IPN triangulation of GRB031111 (=H2924): small error box
  93. XRF031109 (=H2919): A very long XRF localized by HETE
  94. IPN triangulation of GRB031108 (large error box)
  95. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  96. GRB030929/SN2003jd association unlikely based on IPN localiztion
  97. IPN triangulation of GRB031027 (small error box)
  98. IPN triangulation of GRB031026B (large error box)
  99. SN 2003jd (SN/GRB?), Radio Observations
  100. SN 2003jd (SN/GRB?) - possible association with GRB 030929

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