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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"

37165 results found.

  1. GRB 030324: Detection and Color of Host Galaxy
  2. GRB 040511: NIR observations with REM
  3. GRB040511: Redshift identifcation
  4. GRB 040511: Optical limit
  5. GRB040511: Candidate optical/NIR afterglow
  6. IBAS GRB Alerts n.1785 to 1791
  7. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  8. GRB 040511: Second Epoch Optical Observations
  9. IBAS GRB Alerts 1781-4
  10. GRB 040511: Optical observations
  11. GRB 040511: Optical Observations
  12. GRB040511: Optical Observations
  13. GRB040511: Optical Observations
  14. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  15. IBAS GRB Alert number 1774: NOT a real GRB
  16. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  17. IBAS Alerts 1771 and 1772: NOT a real GRB
  18. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  19. IPN triangulation of GRB040425 (=H3183)
  20. On Line Availability of Archival HETE Fregate Data and Lightcurves
  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. GRB040323: NIR Observations and Variable Object
  40. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  41. GRB 040323, a dark GRB ?
  42. short hard GRB 040322
  43. GRB 040323: a long GRB detected with INTEGRAL
  44. IBAS GRB alerts 1679, 1680, 1681
  45. GRB040223: Deep NIR NTT data re-analysis
  46. GRB 040223: XMM-Newton results
  47. GRB040223, improved XMM position
  48. IBAS Alert 1678: not a GRB
  49. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  50. GRB 031203, possible supernova
  51. GRB 040228 Optical observations
  52. IPN triangulation of GRB040228 (H3066, H3067)
  53. GRB040228 : KISO optical follow-up observation
  54. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  55. GRB 040223: Deep NIR NTT observations
  56. GRB 040223 : Optical observation (non-detection)
  57. XMM-Newton Images of GRB 040223
  58. GRB 040223, VLA observations
  59. GRB 040223: REM IJK Observations
  60. GRB 040223 XMM-Newton observation ...
  61. GRB 031203 XMM-Newton observation
  62. GRB 040223 : Planned XMM-Newton observation
  63. GRB 040106 : Planned XMM-Newton observation
  64. GRB 040223: further offline analysis
  65. GRB 040223: a long GRB detected with INTEGRAL
  66. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  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. XMM-Newton observation of GRB040106
  78. GRB 040106 : Planned XMM-Newton observation
  79. GRB 040106 : peak flux
  80. GRB 040106 : a long GRB detected with INTEGRAL
  81. IPN triangulation of an intermediate burst from SGR1806-20
  82. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  83. GRB031225a triangulation (annulus)
  84. IPN triangulation of GRB031219 (large error box)
  85. GRB031220: Palomar Observations
  86. GRB 031220 : Kyoto Optical Observation
  87. GRB 031220: Subaru observation
  88. GRB 031220: Optical observation at Tokyo Tech
  89. GRB031220: ROTSE-IIIb Optical Limits
  90. GRB031220 : Optical Observation of Lulin Observatory
  91. GRB 031203 I-band monitoring
  92. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  93. GRB 2974 follow-up observations
  94. GRB 031203: Discovery of a dust echo
  95. GRB031214 triangulation (annulus), [repost of GCN2487, subject corrected]
  96. GRB030921 triangulation (annulus)
  97. GRB 031203: SMARTS optical monitoring
  98. GRB 021203: A Normal GRB viewed far off axis?
  99. GRB 031203: Variable Radio Source
  100. GRB 031203: Magellan spectrum of possible GRB host

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