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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"

38000 results found.

  1. MASTER: HETE Alert 3274 optical observation
  2. Activivty of SGR 1806-20
  3. IPN triangulation of an intense intermediate burst from SGR1806-20
  4. GRB 040511, very fast decay?
  5. GRB 030324: Detection and Color of Host Galaxy
  6. GRB 040511: NIR observations with REM
  7. GRB040511: Redshift identifcation
  8. GRB 040511: Optical limit
  9. IBAS GRB Alerts n.1785 to 1791
  10. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  11. GRB 040511: Second Epoch Optical Observations
  12. IBAS GRB Alerts 1781-4
  13. GRB 040511: Optical observations
  14. GRB 040511: Optical Observations
  15. GRB040511: Optical Observations
  16. GRB040511: Optical Observations
  17. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  18. IBAS GRB Alert number 1774: NOT a real GRB
  19. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  20. IBAS Alerts 1771 and 1772: NOT a real GRB
  21. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  22. IPN triangulation of GRB040425 (=H3183)
  23. GRB040422: optical observations at CrAO
  24. GRB 040423 (=H3175): A Long GRB Localized by HETE
  25. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  26. GRB040422, BVRcIc field calibration
  27. GRB 040422,optical observation
  28. GRB 040422: a long GRB detected with INTEGRAL
  29. GRB 040403, deep optical observations
  30. INTEGRAL-SPI/ACS GRB data: timing correction
  31. IBAS GRB alerts 1739, 1740, 1741
  32. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  33. GRB 040403: Optical Observations
  34. GRB 040403 Optical Observations
  35. GRB 040403: Optical observations
  36. GRB 040403: optical observations
  37. GRB 040403: Optical Observations
  38. GRB 040403: a long GRB detected with INTEGRAL
  39. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  40. IBAS GRB Alert 1694
  41. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  42. GRB 040323, a dark GRB ?
  43. short hard GRB 040322
  44. GRB 040323: a long GRB detected with INTEGRAL
  45. IBAS GRB alerts 1679, 1680, 1681
  46. GRB040223: Deep NIR NTT data re-analysis
  47. GRB 040223: XMM-Newton results
  48. GRB040223, improved XMM position
  49. IBAS Alert 1678: not a GRB
  50. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  51. GRB 031203, possible supernova
  52. GRB 040228 Optical observations
  53. IPN triangulation of GRB040228 (H3066, H3067)
  54. GRB040228 : KISO optical follow-up observation
  55. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  56. GRB 040223: Deep NIR NTT observations
  57. GRB 040223 : Optical observation (non-detection)
  58. XMM-Newton Images of GRB 040223
  59. GRB 040223, VLA observations
  60. GRB 040223: REM IJK Observations
  61. GRB 040223 XMM-Newton observation ...
  62. GRB 031203 XMM-Newton observation
  63. GRB 040223 : Planned XMM-Newton observation
  64. GRB 040106 : Planned XMM-Newton observation
  65. GRB 040223: further offline analysis
  66. GRB 040223: a long GRB detected with INTEGRAL
  67. Follow-up on IBAS GRB Alert 1379
  68. IBAS GRB alert 1379
  69. SN 2003dh/GRB030329 late-time optical spectroscopy
  70. GRB040106, likely optical afterglow
  71. GRB040106: Second Epoch Optical Observations
  72. GRB 031220: Optical observations of Chandra X-ray sources
  73. XMM-Newton Images of GRB 040106
  74. GRB040106: optical observations with REM+ROSS
  75. GRB031220: observation at Univercity of Miyazaki
  76. GRB 040106: Optical observations
  77. GRB 040106 : Planned XMM-Newton observation
  78. GRB 040106 : peak flux
  79. GRB 040106 : a long GRB detected with INTEGRAL
  80. IPN triangulation of an intermediate burst from SGR1806-20
  81. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  82. GRB031225a triangulation (annulus)
  83. IPN triangulation of GRB031219 (large error box)
  84. GRB031220: Palomar Observations
  85. GRB 031220 : Kyoto Optical Observation
  86. GRB 031220: Subaru observation
  87. GRB 031220: Optical observation at Tokyo Tech
  88. GRB031220 : Optical Observation of Lulin Observatory
  89. GRB 031203 I-band monitoring
  90. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  91. GRB 2974 follow-up observations
  92. GRB 031203: Discovery of a dust echo
  93. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  94. GRB030921 triangulation (annulus)
  95. GRB 031203: SMARTS optical monitoring
  96. GRB 021203: A Normal GRB viewed far off axis?
  97. GRB 031203: Variable Radio Source
  98. GRB 031203: Magellan spectrum of possible GRB host
  99. GRB 031203: Optical/IR Astrometry
  100. IPN/HETE localization of GRB031203B (=H2949; large error box)

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