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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"

37676 results found.

  1. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  2. GRB040422, BVRcIc field calibration
  3. GRB 040422,optical observation
  4. GRB 040422: a long GRB detected with INTEGRAL
  5. GRB 040403, deep optical observations
  6. INTEGRAL-SPI/ACS GRB data: timing correction
  7. IBAS GRB alerts 1739, 1740, 1741
  8. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  9. GRB 040403: Optical Observations
  10. GRB 040403 Optical Observations
  11. GRB 040403: Optical observations
  12. GRB 040403: optical observations
  13. GRB 040403: Optical Observations
  14. GRB 040403: a long GRB detected with INTEGRAL
  15. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  16. IBAS GRB Alert 1694
  17. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  18. GRB 040323, a dark GRB ?
  19. short hard GRB 040322
  20. GRB 040323: a long GRB detected with INTEGRAL
  21. IBAS GRB alerts 1679, 1680, 1681
  22. GRB040223: Deep NIR NTT data re-analysis
  23. GRB 040223: XMM-Newton results
  24. GRB040223, improved XMM position
  25. IBAS Alert 1678: not a GRB
  26. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  27. GRB 031203, possible supernova
  28. GRB 040228 Optical observations
  29. IPN triangulation of GRB040228 (H3066, H3067)
  30. GRB040228 : KISO optical follow-up observation
  31. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  32. GRB 040223: Deep NIR NTT observations
  33. GRB 040223 : Optical observation (non-detection)
  34. XMM-Newton Images of GRB 040223
  35. GRB 040223, VLA observations
  36. GRB 040223: REM IJK Observations
  37. GRB 040223 XMM-Newton observation ...
  38. GRB 031203 XMM-Newton observation
  39. GRB 040223 : Planned XMM-Newton observation
  40. GRB 040106 : Planned XMM-Newton observation
  41. GRB 040223: further offline analysis
  42. GRB 040223: a long GRB detected with INTEGRAL
  43. Follow-up on IBAS GRB Alert 1379
  44. IBAS GRB alert 1379
  45. SN 2003dh/GRB030329 late-time optical spectroscopy
  46. GRB040106, likely optical afterglow
  47. GRB040106: Second Epoch Optical Observations
  48. GRB 031220: Optical observations of Chandra X-ray sources
  49. XMM-Newton Images of GRB 040106
  50. GRB040106: optical observations with REM+ROSS
  51. GRB031220: observation at Univercity of Miyazaki
  52. GRB 040106: Optical observations
  53. GRB 040106 : Planned XMM-Newton observation
  54. GRB 040106 : peak flux
  55. GRB 040106 : a long GRB detected with INTEGRAL
  56. IPN triangulation of an intermediate burst from SGR1806-20
  57. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  58. GRB031225a triangulation (annulus)
  59. IPN triangulation of GRB031219 (large error box)
  60. GRB031220: Palomar Observations
  61. GRB 031220 : Kyoto Optical Observation
  62. GRB 031220: Subaru observation
  63. GRB 031220: Optical observation at Tokyo Tech
  64. GRB031220 : Optical Observation of Lulin Observatory
  65. GRB 031203 I-band monitoring
  66. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  67. GRB 2974 follow-up observations
  68. GRB 031203: Discovery of a dust echo
  69. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  70. GRB030921 triangulation (annulus)
  71. GRB 031203: SMARTS optical monitoring
  72. GRB 021203: A Normal GRB viewed far off axis?
  73. GRB 031203: Variable Radio Source
  74. GRB 031203: Magellan spectrum of possible GRB host
  75. GRB 031203: Optical/IR Astrometry
  76. IPN/HETE localization of GRB031203B (=H2949; large error box)
  77. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  78. GRB 031203: Deep NIR NTT & VLT observations
  79. GRB031203: K' Photometry of the likely GRB host
  80. GRB 031203: Radio detection
  81. GRB 031203: Further reports on December 4 observations
  82. GRB 031203: IR NTTobservations do not confirm REM detection
  83. GRB031203 : Optical Observation of Lulin Observatory
  84. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  85. GRB 031203: Apparent Spectral Break
  86. GRB 031203: IR REM Observations
  87. GRB031203: Optical Observations
  88. GRB 031203 XMM-Newton observation
  89. GRB 031203: Optical/IR SMARTS Observations
  90. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  91. GRB 031203: further analysis of INTEGRAL data
  92. GRB 031203: A long GRB detected with INTEGRAL
  93. IPN triangulation of GRB031201 (large error box)
  94. IPN triangulation of GRB031130 (large error box)
  95. GRB031111A, prompt optical observations
  96. GRB 030329: Planned XMM-Newton Observation
  97. IPN triangulation of GRB031120 (two large error boxes)
  98. GRB 031111B (= H2925) : Kyoto Optical Observation
  99. IPN/HETE localization of GRB031109 (=H2917; large error box)
  100. IPN detection of activity from SGR1806-20

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