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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"

32569 results found.

  1. GRB 040812: Optical counterparts of CXO sources
  2. XRF040812: possible afterglow
  3. CXO observation of GRB 040812
  4. IPN/HETE localizations of GRB040810 (=H3489)
  5. GRB 040812: Keck and LCO optical observations
  6. GRB 040812: Keck and LCO observations
  7. GRB 040812: radio observations
  8. GRB040812, optical/IR observations
  9. XRF040701: Optical Observations at ESO
  10. IPN/HETE triangulation of GRB040802 (=H3485)
  11. GRB 040730, infrared observations
  12. GRB 040730: Optical observations
  13. Ongoing activity of SGR 1806-20
  14. GRB040624: optical monitoring at TNG
  15. XRF 040701 - optical observations of the decaying Chandra source
  16. XRF040701: Second-Epoch Chandra Observations
  17. XRF040701: VLA Observations
  18. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  19. XRF040701: First-Epoch Chandra Observations
  20. GRB040709 J,H-band observations
  21. GRB040624, optical observations
  22. XRF 040701, optical observations
  23. GRB 040624: optical observations
  24. Optical Observations of GRB040624
  25. GRB 040624: optical observations at TNG and VLT
  26. GRB 040624: R-band observations
  27. GRB 040624, optical observations
  28. GRB 030329: Rebrightening of hyperluminal ejecta.
  29. IPN Summary of SGR1806-20 Activity in 2004
  30. GRB040511: Retraction of redshift identification
  31. SGR 1806-20: no IR variability of the proposed counterparts
  32. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  33. Activivty of SGR 1806-20
  34. GRB 040511, very fast decay?
  35. GRB 030324: Detection and Color of Host Galaxy
  36. GRB 040511: NIR observations with REM
  37. GRB040511: Redshift identifcation
  38. GRB 040511: Optical limit
  39. GRB040511: Candidate optical/NIR afterglow
  40. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  41. GRB 040511: Second Epoch Optical Observations
  42. GRB 040511: Optical observations
  43. GRB 040511: Optical Observations
  44. GRB040511: Optical Observations
  45. GRB040511: Optical Observations
  46. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  47. IPN triangulation of GRB040425 (=H3183)
  48. On Line Availability of Archival HETE Fregate Data and Lightcurves
  49. GRB040422, optical observations at Loiano
  50. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  51. GRB040422, BVRcIc field calibration
  52. GRB040422: optical and NIR observations at the VLT
  53. GRB 040403, deep optical observations
  54. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  55. GRB 040403: Optical Observations
  56. GRB 040403 Optical Observations
  57. GRB 040403: Optical observations
  58. GRB 040403: optical observations
  59. GRB 040403: Optical Observations
  60. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  61. GRB040323: NIR Observations and Variable Object
  62. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  63. GRB 040323, a dark GRB ?
  64. GRB040223: Deep NIR NTT data re-analysis
  65. GRB 040223: XMM-Newton results
  66. GRB040223, improved XMM position
  67. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  68. GRB 031203, possible supernova
  69. IBAS results on a burst from SGR1806-20
  70. GRB 040228 Optical observations
  71. IPN triangulation of GRB040228 (H3066, H3067)
  72. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  73. GRB 040223: Deep NIR NTT observations
  74. GRB 040223 : Optical observation (non-detection)
  75. XMM-Newton Images of GRB 040223
  76. GRB 040223, VLA observations
  77. GRB 040223: REM IJK Observations
  78. GRB 040223 XMM-Newton observation ...
  79. GRB 031203 XMM-Newton observation
  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. SN 2003dh/GRB030329 late-time optical spectroscopy
  87. GRB040106, Radio Observations
  88. GRB040106, likely optical afterglow
  89. GRB040106: Second Epoch Optical Observations
  90. GRB 031220: Optical observations of Chandra X-ray sources
  91. XMM-Newton Images of GRB 040106
  92. GRB040106: optical observations with REM+ROSS
  93. GRB031220: observation at Univercity of Miyazaki
  94. GRB 040106: Optical observations
  95. XMM-Newton observation of GRB040106
  96. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  97. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  98. GRB 031203 I-band monitoring
  99. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  100. GRB 2974 follow-up observations

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