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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"

42949 results found.

  1. IPN Summary of SGR1806-20 Activity in 2004
  2. GRB040511: Retraction of redshift identification
  3. SGR 1806-20: no IR variability of the proposed counterparts
  4. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  5. SGR 1806-20, potential NIR counterpart
  6. GRB 040606: Optical observations
  7. MASTER: HETE Alert 3274 optical observation
  8. Activivty of SGR 1806-20
  9. IPN triangulation of an intense intermediate burst from SGR1806-20
  10. GRB 040511, very fast decay?
  11. GRB 030324: Detection and Color of Host Galaxy
  12. GRB 040511: NIR observations with REM
  13. GRB040511: Redshift identifcation
  14. GRB 040511: Optical limit
  15. GRB040511: Candidate optical/NIR afterglow
  16. IBAS GRB Alerts n.1785 to 1791
  17. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  18. GRB 040511: Second Epoch Optical Observations
  19. IBAS GRB Alerts 1781-4
  20. GRB 040511: Optical observations
  21. GRB 040511: Optical Observations
  22. GRB040511: Optical Observations
  23. GRB040511: Optical Observations
  24. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  25. IBAS GRB Alert number 1774: NOT a real GRB
  26. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  27. IBAS Alerts 1771 and 1772: NOT a real GRB
  28. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  29. IPN triangulation of GRB040425 (=H3183)
  30. On Line Availability of Archival HETE Fregate Data and Lightcurves
  31. GRB040422: optical observations at Xinglong Observatory
  32. GRB040422: optical observations at CrAO
  33. GRB 040423 (=H3175): A Long GRB Localized by HETE
  34. GRB040422, optical observations at Loiano
  35. GRB040422 : I-band follow-up observation at Lulin Observatory
  36. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  37. GRB040422, BVRcIc field calibration
  38. GRB040422: optical and NIR observations at the VLT
  39. GRB 040422: a long GRB detected with INTEGRAL
  40. GRB 040403, deep optical observations
  41. MASTER: HETE Alert 3163, 3167 technical optical observation
  42. INTEGRAL-SPI/ACS GRB data: timing correction
  43. IBAS GRB alerts 1739, 1740, 1741
  44. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  45. GRB 040403: Optical Observations
  46. GRB 040403: Optical observations
  47. GRB 040403: optical observations
  48. GRB 040403: Optical Observations
  49. GRB 040403: a long GRB detected with INTEGRAL
  50. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  51. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  52. IBAS GRB Alert 1694
  53. GRB040323: NIR Observations and Variable Object
  54. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  55. GRB 040323, a dark GRB ?
  56. short hard GRB 040322
  57. GRB 040323: a long GRB detected with INTEGRAL
  58. IBAS GRB alerts 1679, 1680, 1681
  59. GRB 040223: XMM-Newton results
  60. IBAS Alert 1678: not a GRB
  61. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  62. GRB 031203, possible supernova
  63. MASTER: RXTE GRB040308 optical observation
  64. IBAS results on a burst from SGR1806-20
  65. INTEGRAL detection of activity from SGR1806-20
  66. RXTE GRB040229 optical observation: no candidate
  67. GRB 040228 Optical observations
  68. IPN triangulation of GRB040228 (H3066, H3067)
  69. GRB040228 : KISO optical follow-up observation
  70. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  71. GRB 040223: Deep NIR NTT observations
  72. GRB 040223 : Optical observation (non-detection)
  73. XMM-Newton Images of GRB 040223
  74. GRB 040223, VLA observations
  75. GRB 040223: REM IJK Observations
  76. GRB 040223 XMM-Newton observation ...
  77. GRB 031203 XMM-Newton observation
  78. GRB 040223: further offline analysis
  79. GRB 040223: a long GRB detected with INTEGRAL
  80. GRB031111, optical observations
  81. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  82. GRB031203: Chandra Observations
  83. GRB040106, follow-up radio observations
  84. GRB040106: refined X-ray transient position
  85. Follow-up on IBAS GRB Alert 1379
  86. IBAS GRB alert 1379
  87. SN 2003dh/GRB030329 late-time optical spectroscopy
  88. GRB040106, Radio Observations
  89. GRB040106, likely optical afterglow
  90. GRB040106: Second Epoch Optical Observations
  91. GRB 031220: Optical observations of Chandra X-ray sources
  92. XMM-Newton Images of GRB 040106
  93. GRB040106: optical observations with REM+ROSS
  94. GRB031220: observation at Univercity of Miyazaki
  95. GRB 040106: Optical observations
  96. XMM-Newton observation of GRB040106
  97. GRB 040106 : peak flux
  98. GRB 040106 : a long GRB detected with INTEGRAL
  99. IPN triangulation of an intermediate burst from SGR1806-20
  100. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources

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