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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').
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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"

32544 results found.

  1. GRB 040624: R-band observations
  2. GRB 040624, optical observations
  3. GRB 030329: Rebrightening of hyperluminal ejecta.
  4. IPN Summary of SGR1806-20 Activity in 2004
  5. GRB040511: Retraction of redshift identification
  6. SGR 1806-20: no IR variability of the proposed counterparts
  7. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  8. Activivty of SGR 1806-20
  9. GRB 040511, very fast decay?
  10. GRB 030324: Detection and Color of Host Galaxy
  11. GRB 040511: NIR observations with REM
  12. GRB040511: Redshift identifcation
  13. GRB 040511: Optical limit
  14. GRB040511: Candidate optical/NIR afterglow
  15. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  16. GRB 040511: Second Epoch Optical Observations
  17. GRB 040511: Optical observations
  18. GRB 040511: Optical Observations
  19. GRB040511: Optical Observations
  20. GRB040511: Optical Observations
  21. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  22. IPN triangulation of GRB040425 (=H3183)
  23. On Line Availability of Archival HETE Fregate Data and Lightcurves
  24. GRB040422, optical observations at Loiano
  25. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  26. GRB040422, BVRcIc field calibration
  27. GRB040422: optical and NIR observations at the VLT
  28. GRB 040403, deep optical observations
  29. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  30. GRB 040403: Optical Observations
  31. GRB 040403 Optical Observations
  32. GRB 040403: Optical observations
  33. GRB 040403: optical observations
  34. GRB 040403: Optical Observations
  35. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  36. GRB040323: NIR Observations and Variable Object
  37. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  38. GRB 040323, a dark GRB ?
  39. GRB040223: Deep NIR NTT data re-analysis
  40. GRB 040223: XMM-Newton results
  41. GRB040223, improved XMM position
  42. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  43. GRB 031203, possible supernova
  44. IBAS results on a burst from SGR1806-20
  45. GRB 040228 Optical observations
  46. IPN triangulation of GRB040228 (H3066, H3067)
  47. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  48. GRB 040223: Deep NIR NTT observations
  49. GRB 040223 : Optical observation (non-detection)
  50. XMM-Newton Images of GRB 040223
  51. GRB 040223, VLA observations
  52. GRB 040223: REM IJK Observations
  53. GRB 040223 XMM-Newton observation ...
  54. GRB 031203 XMM-Newton observation
  55. GRB031111, optical observations
  56. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  57. GRB031203: Chandra Observations
  58. GRB040106, follow-up radio observations
  59. GRB040106: refined X-ray transient position
  60. Follow-up on IBAS GRB Alert 1379
  61. SN 2003dh/GRB030329 late-time optical spectroscopy
  62. GRB040106, Radio Observations
  63. GRB040106, likely optical afterglow
  64. GRB040106: Second Epoch Optical Observations
  65. GRB 031220: Optical observations of Chandra X-ray sources
  66. XMM-Newton Images of GRB 040106
  67. GRB040106: optical observations with REM+ROSS
  68. GRB031220: observation at Univercity of Miyazaki
  69. GRB 040106: Optical observations
  70. XMM-Newton observation of GRB040106
  71. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  72. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  73. GRB 031203 I-band monitoring
  74. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  75. GRB 2974 follow-up observations
  76. GRB031203, improved XMM position
  77. GRB 031203: SMARTS optical monitoring
  78. GRB 021203: A Normal GRB viewed far off axis?
  79. GRB 031203: Variable Radio Source
  80. GRB 031203: Magellan spectrum of possible GRB host
  81. GRB 031203: Optical/IR Astrometry
  82. GRB031203 K prime photometry: correction to galaxy coordinates
  83. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  84. XMM-Newton Observation of GRB031203
  85. GRB031203: K' Photometry of the likely GRB host
  86. XMM-Newton Observation of GRB031203
  87. GRB 031203: Radio detection
  88. GRB 031203: Further reports on December 4 observations
  89. GRB 031203: IR NTTobservations do not confirm REM detection
  90. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  91. GRB 031203: Apparent Spectral Break
  92. GRB031203: Planned XMM-Newton observation II
  93. GRB 031203: IR REM Observations
  94. GRB031203: Optical Observations
  95. GRB 031203 XMM-Newton observation
  96. GRB 031203: Optical/IR SMARTS Observations
  97. GRB031203: Planned XMM-Newton observation
  98. GRB031111A, prompt optical observations
  99. GRB 031111, Radio observations
  100. GRB 031111: Optical observations

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