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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"

42958 results found.

  1. XMM-Newton Images of GRB 040106
  2. GRB040106: optical observations with REM+ROSS
  3. GRB031220: observation at Univercity of Miyazaki
  4. GRB 040106: Optical observations
  5. XMM-Newton observation of GRB040106
  6. GRB 040106 : peak flux
  7. GRB 040106 : a long GRB detected with INTEGRAL
  8. IPN triangulation of an intermediate burst from SGR1806-20
  9. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  10. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  11. GRB031225a triangulation (annulus)
  12. IPN triangulation of GRB031219 (large error box)
  13. GRB031220: Palomar Observations
  14. GRB 031220 : Kyoto Optical Observation
  15. GRB 031220: Subaru observation
  16. GRB 031220: Optical observation at Tokyo Tech
  17. GRB031220: ROTSE-IIIb Optical Limits
  18. GRB031220 : Optical Observation of Lulin Observatory
  19. GRB 031203 I-band monitoring
  20. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  21. GRB 2974 follow-up observations
  22. GRB031203, improved XMM position
  23. GRB 031203: Discovery of a dust echo
  24. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  25. GRB030921 triangulation (annulus)
  26. GRB 031203: SMARTS optical monitoring
  27. GRB 021203: A Normal GRB viewed far off axis?
  28. GRB 031203: Variable Radio Source
  29. GRB 031203: Magellan spectrum of possible GRB host
  30. GRB 031203: Optical/IR Astrometry
  31. IPN/HETE localization of GRB031203B (=H2949; large error box)
  32. GRB031203 K prime photometry: correction to galaxy coordinates
  33. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  34. XMM-Newton Observation of GRB031203
  35. GRB 031203: Deep NIR NTT & VLT observations
  36. GRB031203: K' Photometry of the likely GRB host
  37. XMM-Newton Observation of GRB031203
  38. GRB 031203: Radio detection
  39. GRB 031203: Further reports on December 4 observations
  40. GRB 031203: IR NTTobservations do not confirm REM detection
  41. GRB031203 : Optical Observation of Lulin Observatory
  42. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  43. GRB 031203: Apparent Spectral Break
  44. GRB031203: Planned XMM-Newton observation II
  45. GRB 031203: IR REM Observations
  46. GRB031203: Optical Observations
  47. GRB 031203 XMM-Newton observation
  48. GRB 031203: Optical/IR SMARTS Observations
  49. GRB031203: Planned XMM-Newton observation
  50. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  51. GRB 031203: further analysis of INTEGRAL data
  52. GRB 031203: A long GRB detected with INTEGRAL
  53. IPN triangulation of GRB031201 (large error box)
  54. IPN triangulation of GRB031130 (large error box)
  55. GRB031111A, prompt optical observations
  56. IPN triangulation of GRB031120 (two large error boxes)
  57. GRB 031111B (= H2925) : Kyoto Optical Observation
  58. IPN/HETE localization of GRB031109 (=H2917; large error box)
  59. IPN detection of activity from SGR1806-20
  60. GRB 031111, Radio observations
  61. IPN triangulation of GRB031114 (large error box)
  62. IPN triangulation of GRB031107 (two large error boxes)
  63. GRB 031111: Optical observations
  64. GRB 031111, optical observations
  65. SN 2003jd (SN/GRB?) -- X-ray Observations
  66. HETE Prompt GRB Spectral Analyses
  67. IPN triangulation of GRB031111 (=H2924): small error box
  68. XRF031109 (=H2919): A very long XRF localized by HETE
  69. IPN triangulation of GRB031108 (large error box)
  70. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  71. GRB030929/SN2003jd association unlikely based on IPN localiztion
  72. IPN triangulation of GRB031027 (small error box)
  73. IPN triangulation of GRB031026B (large error box)
  74. Lulin optical follow-up observations of GRB031026
  75. SN 2003jd (SN/GRB?), Radio Observations
  76. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  77. GRB 031026: Further Ic Observations
  78. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  79. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  80. IPN triangulation of GRB031024 (single error box)
  81. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  82. GRB031026 : KISO optical follow-up observation
  83. IPN triangulation of GRB031024 (annulus)
  84. IPN triangulation of GRB031020 (large error box)
  85. GRB030329: radio observations at RT-22 (CrAO)
  86. IPN triangulation of GRB031016 (two large error boxes)
  87. IBAS alert 1180 refers to a burst from SGR 1806-20
  88. HETE Prompt GRB Light Curves and Color-Color Diagrams
  89. IPN triangulation of GRB031014 (annulus)
  90. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  91. XRF 030824: additional observations at CFHT
  92. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  93. IPN triangulation of GRB031008 (annulus)
  94. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  95. IPN detection of continued activity from SGR1806-20
  96. IPN triangulation of GRB031007 (two large error boxes)
  97. XRF 030723: Subaru Optical Observations
  98. IPN triangulation of GRB031004B (annulus)
  99. IPN triangulation of GRB031004A (short/hard; annulus)
  100. IPN triangulation of GRB030929 (short/hard; annulus)

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