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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"

37998 results found.

  1. IPN triangulation of an intense intermediate burst from SGR1806-20
  2. GRB 040511, very fast decay?
  3. GRB 030324: Detection and Color of Host Galaxy
  4. GRB 040511: NIR observations with REM
  5. GRB040511: Redshift identifcation
  6. GRB 040511: Optical limit
  7. IBAS GRB Alerts n.1785 to 1791
  8. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  9. GRB 040511: Second Epoch Optical Observations
  10. IBAS GRB Alerts 1781-4
  11. GRB 040511: Optical observations
  12. GRB 040511: Optical Observations
  13. GRB040511: Optical Observations
  14. GRB040511: Optical Observations
  15. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  16. IBAS GRB Alert number 1774: NOT a real GRB
  17. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  18. IBAS Alerts 1771 and 1772: NOT a real GRB
  19. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  20. IPN triangulation of GRB040425 (=H3183)
  21. GRB040422: optical observations at CrAO
  22. GRB 040423 (=H3175): A Long GRB Localized by HETE
  23. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  24. GRB040422, BVRcIc field calibration
  25. GRB 040422,optical observation
  26. GRB 040422: a long GRB detected with INTEGRAL
  27. GRB 040403, deep optical observations
  28. INTEGRAL-SPI/ACS GRB data: timing correction
  29. IBAS GRB alerts 1739, 1740, 1741
  30. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  31. GRB 040403: Optical Observations
  32. GRB 040403 Optical Observations
  33. GRB 040403: Optical observations
  34. GRB 040403: optical observations
  35. GRB 040403: Optical Observations
  36. GRB 040403: a long GRB detected with INTEGRAL
  37. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  38. IBAS GRB Alert 1694
  39. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  40. GRB 040323, a dark GRB ?
  41. short hard GRB 040322
  42. GRB 040323: a long GRB detected with INTEGRAL
  43. IBAS GRB alerts 1679, 1680, 1681
  44. GRB040223: Deep NIR NTT data re-analysis
  45. GRB 040223: XMM-Newton results
  46. GRB040223, improved XMM position
  47. IBAS Alert 1678: not a GRB
  48. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  49. GRB 031203, possible supernova
  50. GRB 040228 Optical observations
  51. IPN triangulation of GRB040228 (H3066, H3067)
  52. GRB040228 : KISO optical follow-up observation
  53. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  54. GRB 040223: Deep NIR NTT observations
  55. GRB 040223 : Optical observation (non-detection)
  56. XMM-Newton Images of GRB 040223
  57. GRB 040223, VLA observations
  58. GRB 040223: REM IJK Observations
  59. GRB 040223 XMM-Newton observation ...
  60. GRB 031203 XMM-Newton observation
  61. GRB 040223 : Planned XMM-Newton observation
  62. GRB 040106 : Planned XMM-Newton observation
  63. GRB 040223: further offline analysis
  64. GRB 040223: a long GRB detected with INTEGRAL
  65. Follow-up on IBAS GRB Alert 1379
  66. IBAS GRB alert 1379
  67. SN 2003dh/GRB030329 late-time optical spectroscopy
  68. GRB040106, likely optical afterglow
  69. GRB040106: Second Epoch Optical Observations
  70. GRB 031220: Optical observations of Chandra X-ray sources
  71. XMM-Newton Images of GRB 040106
  72. GRB040106: optical observations with REM+ROSS
  73. GRB031220: observation at Univercity of Miyazaki
  74. GRB 040106: Optical observations
  75. GRB 040106 : Planned XMM-Newton observation
  76. GRB 040106 : peak flux
  77. GRB 040106 : a long GRB detected with INTEGRAL
  78. IPN triangulation of an intermediate burst from SGR1806-20
  79. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  80. GRB031225a triangulation (annulus)
  81. IPN triangulation of GRB031219 (large error box)
  82. GRB031220: Palomar Observations
  83. GRB 031220 : Kyoto Optical Observation
  84. GRB 031220: Subaru observation
  85. GRB 031220: Optical observation at Tokyo Tech
  86. GRB031220 : Optical Observation of Lulin Observatory
  87. GRB 031203 I-band monitoring
  88. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  89. GRB 2974 follow-up observations
  90. GRB 031203: Discovery of a dust echo
  91. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  92. GRB030921 triangulation (annulus)
  93. GRB 031203: SMARTS optical monitoring
  94. GRB 021203: A Normal GRB viewed far off axis?
  95. GRB 031203: Variable Radio Source
  96. GRB 031203: Magellan spectrum of possible GRB host
  97. GRB 031203: Optical/IR Astrometry
  98. IPN/HETE localization of GRB031203B (=H2949; large error box)
  99. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  100. GRB 031203: Deep NIR NTT & VLT observations

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