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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"
  1. GRB 040511: Optical limit
  2. GRB040511: Candidate optical/NIR afterglow
  3. IBAS GRB Alerts n.1785 to 1791
  4. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  5. GRB 040511: Second Epoch Optical Observations
  6. IBAS GRB Alerts 1781-4
  7. GRB 040511: Optical observations
  8. GRB 040511: Optical Observations
  9. GRB040511: Optical Observations
  10. GRB040511: Optical Observations
  11. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  12. IBAS GRB Alert number 1774: NOT a real GRB
  13. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  14. IBAS Alerts 1771 and 1772: NOT a real GRB
  15. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  16. IPN triangulation of GRB040425 (=H3183)
  17. On Line Availability of Archival HETE Fregate Data and Lightcurves
  18. GRB040422: optical observations at Xinglong Observatory
  19. GRB040422: optical observations at CrAO
  20. GRB 040423 (=H3175): A Long GRB Localized by HETE
  21. GRB040422, optical observations at Loiano
  22. GRB040422 : I-band follow-up observation at Lulin Observatory
  23. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  24. GRB040422, BVRcIc field calibration
  25. GRB 040422,optical observation
  26. GRB040422: optical and NIR observations at the VLT
  27. GRB 040422: a long GRB detected with INTEGRAL
  28. GRB 040403, deep optical observations
  29. MASTER: HETE Alert 3163, 3167 technical optical observation
  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. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  40. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  41. IBAS GRB Alert 1694
  42. GRB040323: NIR Observations and Variable Object
  43. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  44. GRB 040323, a dark GRB ?
  45. short hard GRB 040322
  46. GRB 040323: a long GRB detected with INTEGRAL
  47. IBAS GRB alerts 1679, 1680, 1681
  48. GRB040223: Deep NIR NTT data re-analysis
  49. GRB 040223: XMM-Newton results
  50. GRB040223, improved XMM position
  51. IBAS Alert 1678: not a GRB
  52. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  53. GRB 031203, possible supernova
  54. MASTER: RXTE GRB040308 optical observation
  55. IBAS results on a burst from SGR1806-20
  56. INTEGRAL detection of activity from SGR1806-20
  57. RXTE GRB040229 optical observation: no candidate
  58. GRB 040228 Optical observations
  59. IPN triangulation of GRB040228 (H3066, H3067)
  60. GRB040228 : KISO optical follow-up observation
  61. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  62. GRB 040223: Deep NIR NTT observations
  63. GRB 040223 : Optical observation (non-detection)
  64. XMM-Newton Images of GRB 040223
  65. GRB 040223, VLA observations
  66. GRB 040223: REM IJK Observations
  67. GRB 040223 XMM-Newton observation ...
  68. GRB 031203 XMM-Newton observation
  69. GRB 040223 : Planned XMM-Newton observation
  70. GRB 040106 : Planned XMM-Newton observation
  71. GRB 040223: further offline analysis
  72. GRB 040223: a long GRB detected with INTEGRAL
  73. GRB031111, optical observations
  74. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  75. GRB031203: Chandra Observations
  76. GRB040106, follow-up radio observations
  77. GRB040106: refined X-ray transient position
  78. Follow-up on IBAS GRB Alert 1379
  79. IBAS GRB alert 1379
  80. SN 2003dh/GRB030329 late-time optical spectroscopy
  81. GRB040106, Radio Observations
  82. GRB040106, likely optical afterglow
  83. GRB040106: Second Epoch Optical Observations
  84. GRB 031220: Optical observations of Chandra X-ray sources
  85. XMM-Newton Images of GRB 040106
  86. GRB040106: optical observations with REM+ROSS
  87. GRB031220: observation at Univercity of Miyazaki
  88. GRB 040106: Optical observations
  89. XMM-Newton observation of GRB040106
  90. GRB 040106 : Planned XMM-Newton observation
  91. GRB 040106 : peak flux
  92. GRB 040106 : a long GRB detected with INTEGRAL
  93. IPN triangulation of an intermediate burst from SGR1806-20
  94. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  95. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  96. GRB031225a triangulation (annulus)
  97. IPN triangulation of GRB031219 (large error box)
  98. GRB031220: Palomar Observations
  99. GRB 031220 : Kyoto Optical Observation
  100. GRB 031220: Subaru observation

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