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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"

45606 results found.

  1. INTEGRAL detection of activity from SGR1806-20
  2. RXTE GRB040229 optical observation: no candidate
  3. GRB 040228 Optical observations
  4. IPN triangulation of GRB040228 (H3066, H3067)
  5. GRB040228 : KISO optical follow-up observation
  6. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  7. GRB 040223: Deep NIR NTT observations
  8. GRB 040223 : Optical observation (non-detection)
  9. XMM-Newton Images of GRB 040223
  10. GRB 040223, VLA observations
  11. GRB 040223: REM IJK Observations
  12. GRB 040223 XMM-Newton observation ...
  13. GRB 031203 XMM-Newton observation
  14. GRB 040223 : Planned XMM-Newton observation
  15. GRB 040106 : Planned XMM-Newton observation
  16. GRB 040223: further offline analysis
  17. GRB 040223: a long GRB detected with INTEGRAL
  18. GRB031111, optical observations
  19. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  20. GRB031203: Chandra Observations
  21. GRB040106, follow-up radio observations
  22. GRB040106: refined X-ray transient position
  23. Follow-up on IBAS GRB Alert 1379
  24. IBAS GRB alert 1379
  25. SN 2003dh/GRB030329 late-time optical spectroscopy
  26. GRB040106, Radio Observations
  27. GRB040106, likely optical afterglow
  28. GRB040106: Second Epoch Optical Observations
  29. GRB 031220: Optical observations of Chandra X-ray sources
  30. XMM-Newton Images of GRB 040106
  31. GRB040106: optical observations with REM+ROSS
  32. GRB031220: observation at Univercity of Miyazaki
  33. GRB 040106: Optical observations
  34. XMM-Newton observation of GRB040106
  35. GRB 040106 : Planned XMM-Newton observation
  36. GRB 040106 : peak flux
  37. GRB 040106 : a long GRB detected with INTEGRAL
  38. IPN triangulation of an intermediate burst from SGR1806-20
  39. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  40. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  41. GRB031225a triangulation (annulus)
  42. IPN triangulation of GRB031219 (large error box)
  43. GRB031220: Palomar Observations
  44. GRB 031220 : Kyoto Optical Observation
  45. GRB 031220: Subaru observation
  46. GRB 031220: Optical observation at Tokyo Tech
  47. GRB031220: ROTSE-IIIb Optical Limits
  48. GRB031220 : Optical Observation of Lulin Observatory
  49. GRB 031203 I-band monitoring
  50. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  51. GRB 2974 follow-up observations
  52. GRB031203, improved XMM position
  53. GRB 031203: Discovery of a dust echo
  54. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  55. GRB030921 triangulation (annulus)
  56. GRB 031203: SMARTS optical monitoring
  57. GRB 021203: A Normal GRB viewed far off axis?
  58. XMM-Newton Observations of GRB031203: Preliminary Images
  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 K prime photometry: correction to galaxy coordinates
  64. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  65. XMM-Newton Observation of GRB031203
  66. GRB 031203: Deep NIR NTT & VLT observations
  67. GRB031203: K' Photometry of the likely GRB host
  68. XMM-Newton Observation of GRB031203
  69. GRB 031203: Radio detection
  70. GRB 031203: Further reports on December 4 observations
  71. GRB 031203: IR NTTobservations do not confirm REM detection
  72. GRB031203 : Optical Observation of Lulin Observatory
  73. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  74. GRB 031203: Apparent Spectral Break
  75. GRB031203: Planned XMM-Newton observation II
  76. GRB 031203: IR REM Observations
  77. GRB031203: Optical Observations
  78. GRB 031203 XMM-Newton observation
  79. GRB 031203: Optical/IR SMARTS Observations
  80. GRB031203: Planned XMM-Newton observation
  81. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  82. GRB 031203: further analysis of INTEGRAL data
  83. GRB 031203: A long GRB detected with INTEGRAL
  84. IPN triangulation of GRB031201 (large error box)
  85. IPN triangulation of GRB031130 (large error box)
  86. GRB031111A, prompt optical observations
  87. GRB 030329: Planned XMM-Newton Observation
  88. IPN triangulation of GRB031120 (two large error boxes)
  89. GRB 031111B (= H2925) : Kyoto Optical Observation
  90. IPN/HETE localization of GRB031109 (=H2917; large error box)
  91. IPN detection of activity from SGR1806-20
  92. GRB 031111, Radio observations
  93. IPN triangulation of GRB031114 (large error box)
  94. IPN triangulation of GRB031107 (two large error boxes)
  95. GRB 031111: Optical observations
  96. GRB 031111, optical observations
  97. SN 2003jd (SN/GRB?) -- X-ray Observations
  98. HETE Prompt GRB Spectral Analyses
  99. IPN triangulation of GRB031111 (=H2924): small error box
  100. XRF031109 (=H2919): A very long XRF localized by HETE

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