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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"

23619 results found.

  1. GRB 040323, a dark GRB ?
  2. GRB 040323: a long GRB detected with INTEGRAL
  3. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  4. GRB 031203, possible supernova
  5. MASTER: RXTE GRB040308 optical observation
  6. INTEGRAL detection of activity from SGR1806-20
  7. GRB 040228 Optical observations
  8. IPN triangulation of GRB040228 (H3066, H3067)
  9. GRB040228 : KISO optical follow-up observation
  10. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  11. GRB 040223, VLA observations
  12. GRB 040223: REM IJK Observations
  13. GRB 040223 XMM-Newton observation ...
  14. GRB 031203 XMM-Newton observation
  15. GRB 040223: a long GRB detected with INTEGRAL
  16. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  17. GRB040106, follow-up radio observations
  18. SN 2003dh/GRB030329 late-time optical spectroscopy
  19. GRB040106, Radio Observations
  20. GRB040106, likely optical afterglow
  21. GRB 031220: Optical observations of Chandra X-ray sources
  22. GRB040106: optical observations with REM+ROSS
  23. XMM-Newton observation of GRB040106
  24. GRB 040106 : a long GRB detected with INTEGRAL
  25. IPN triangulation of an intermediate burst from SGR1806-20
  26. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  27. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  28. IPN triangulation of GRB031219 (large error box)
  29. GRB031220: Palomar Observations
  30. GRB 031220 : Kyoto Optical Observation
  31. GRB 031220: Subaru observation
  32. GRB031220: ROTSE-IIIb Optical Limits
  33. GRB 031203 I-band monitoring
  34. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  35. GRB031203, improved XMM position
  36. GRB 031203: Discovery of a dust echo
  37. GRB 031203: SMARTS optical monitoring
  38. GRB 031203: Variable Radio Source
  39. GRB 031203: Optical/IR Astrometry
  40. IPN/HETE localization of GRB031203B (=H2949; large error box)
  41. XMM-Newton Observation of GRB031203
  42. GRB 031203: Deep NIR NTT & VLT observations
  43. GRB031203: K' Photometry of the likely GRB host
  44. XMM-Newton Observation of GRB031203
  45. GRB 031203: Further reports on December 4 observations
  46. GRB 031203: IR NTTobservations do not confirm REM detection
  47. GRB031203 : Optical Observation of Lulin Observatory
  48. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  49. GRB 031203: Apparent Spectral Break
  50. GRB031203: Planned XMM-Newton observation II
  51. GRB 031203: IR REM Observations
  52. GRB031203: Optical Observations
  53. GRB 031203 XMM-Newton observation
  54. GRB 031203: Optical/IR SMARTS Observations
  55. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  56. GRB 031203: A long GRB detected with INTEGRAL
  57. IPN triangulation of GRB031201 (large error box)
  58. IPN triangulation of GRB031130 (large error box)
  59. IPN triangulation of GRB031120 (two large error boxes)
  60. GRB 031111B (= H2925) : Kyoto Optical Observation
  61. IPN/HETE localization of GRB031109 (=H2917; large error box)
  62. IPN detection of activity from SGR1806-20
  63. GRB 031111, Radio observations
  64. IPN triangulation of GRB031114 (large error box)
  65. IPN triangulation of GRB031107 (two large error boxes)
  66. GRB 031111, optical observations
  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. GRB030929/SN2003jd association unlikely based on IPN localiztion
  71. IPN triangulation of GRB031027 (small error box)
  72. IPN triangulation of GRB031026B (large error box)
  73. Lulin optical follow-up observations of GRB031026
  74. SN 2003jd (SN/GRB?), Radio Observations
  75. GRB 031026: Further Ic Observations
  76. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  77. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  78. IPN triangulation of GRB031024 (single error box)
  79. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  80. GRB 031026: Ic Observations
  81. GRB031026 : KISO optical follow-up observation
  82. IPN triangulation of GRB031024 (annulus)
  83. IPN triangulation of GRB031020 (large error box)
  84. GRB030329: radio observations at RT-22 (CrAO)
  85. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  86. XRF 030824: additional observations at CFHT
  87. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  88. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  89. IPN triangulation of GRB031004B (annulus)
  90. IPN triangulation of GRB031004A (short/hard; annulus)
  91. A burst from SGR 1806-20 detected with IBAS
  92. XRF 030824: Early follow-up observation at Kiso observatory
  93. XRF 030824: observations at CFHT
  94. IPN triangulation of GRB030926 (short/hard; large error box)
  95. IPN triangulation of GRB030922B (large error box)
  96. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  97. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  98. IPN triangulation of GRB030922A (large error box)
  99. IPN triangulation of GRB030921 (large error box)
  100. IPN triangulation of GRB030919 (large error box)

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