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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"

32578 results found.

  1. GRB040825B, BVRcIc field photometry
  2. GCN GRB OBSERBATION REPORT
  3. GRB040825B: optical observations
  4. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  5. GRB040825B: Correction to GCN 2657
  6. XRF040812: possible afterglow second Chandra observation
  7. GRB 040812: Second epoch CXO Observations
  8. XRF040812: GMRT observations
  9. XRF 040812: optical observation at VLT
  10. GRB 040812: Optical counterparts of CXO sources
  11. XRF040812: possible afterglow
  12. CXO observation of GRB 040812
  13. IPN/HETE localizations of GRB040810 (=H3489)
  14. GRB 040812: Keck and LCO optical observations
  15. GRB 040812: Keck and LCO observations
  16. GRB 040812: radio observations
  17. GRB040812, optical/IR observations
  18. XRF040701: Optical Observations at ESO
  19. IPN/HETE triangulation of GRB040802 (=H3485)
  20. GRB 040730, infrared observations
  21. GRB 040730: Optical observations
  22. Ongoing activity of SGR 1806-20
  23. GRB040624: optical monitoring at TNG
  24. XRF 040701 - optical observations of the decaying Chandra source
  25. XRF040701: Second-Epoch Chandra Observations
  26. XRF040701: VLA Observations
  27. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  28. XRF040701: First-Epoch Chandra Observations
  29. GRB040709 J,H-band observations
  30. GRB040624, optical observations
  31. XRF 040701, optical observations
  32. GRB 040624: optical observations
  33. Optical Observations of GRB040624
  34. GRB 040624: optical observations at TNG and VLT
  35. GRB 040624: R-band observations
  36. GRB 040624, optical observations
  37. GRB 030329: Rebrightening of hyperluminal ejecta.
  38. IPN Summary of SGR1806-20 Activity in 2004
  39. GRB040511: Retraction of redshift identification
  40. SGR 1806-20: no IR variability of the proposed counterparts
  41. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  42. Activivty of SGR 1806-20
  43. GRB 040511, very fast decay?
  44. GRB 030324: Detection and Color of Host Galaxy
  45. GRB 040511: NIR observations with REM
  46. GRB040511: Redshift identifcation
  47. GRB 040511: Optical limit
  48. GRB040511: Candidate optical/NIR afterglow
  49. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  50. GRB 040511: Second Epoch Optical Observations
  51. GRB 040511: Optical observations
  52. GRB 040511: Optical Observations
  53. GRB040511: Optical Observations
  54. GRB040511: Optical Observations
  55. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  56. IPN triangulation of GRB040425 (=H3183)
  57. On Line Availability of Archival HETE Fregate Data and Lightcurves
  58. GRB040422, optical observations at Loiano
  59. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  60. GRB040422, BVRcIc field calibration
  61. GRB040422: optical and NIR observations at the VLT
  62. GRB 040403, deep optical observations
  63. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  64. GRB 040403: Optical Observations
  65. GRB 040403 Optical Observations
  66. GRB 040403: Optical observations
  67. GRB 040403: optical observations
  68. GRB 040403: Optical Observations
  69. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  70. GRB040323: NIR Observations and Variable Object
  71. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  72. GRB 040323, a dark GRB ?
  73. GRB040223: Deep NIR NTT data re-analysis
  74. GRB 040223: XMM-Newton results
  75. GRB040223, improved XMM position
  76. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  77. GRB 031203, possible supernova
  78. IBAS results on a burst from SGR1806-20
  79. GRB 040228 Optical observations
  80. IPN triangulation of GRB040228 (H3066, H3067)
  81. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  82. GRB 040223: Deep NIR NTT observations
  83. GRB 040223 : Optical observation (non-detection)
  84. XMM-Newton Images of GRB 040223
  85. GRB 040223, VLA observations
  86. GRB 040223: REM IJK Observations
  87. GRB 040223 XMM-Newton observation ...
  88. GRB 031203 XMM-Newton observation
  89. GRB031111, optical observations
  90. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  91. GRB031203: Chandra Observations
  92. GRB040106, follow-up radio observations
  93. GRB040106: refined X-ray transient position
  94. Follow-up on IBAS GRB Alert 1379
  95. SN 2003dh/GRB030329 late-time optical spectroscopy
  96. GRB040106, Radio Observations
  97. GRB040106, likely optical afterglow
  98. GRB040106: Second Epoch Optical Observations
  99. GRB 031220: Optical observations of Chandra X-ray sources
  100. XMM-Newton Images of GRB 040106

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