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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"

32689 results found.

  1. GRB 040827: optical and NIR observations at the VLT
  2. GRB 040827: UKIRT - 2nd epoch K-band imaging
  3. GRB 040827: 2nd epoch of Magellan K-band imaging
  4. GRB 040827: K imaging - no evidence of variability
  5. GRB 040827: Detection of NIR afterglow
  6. GRB 040827: Possible detection of optical afterglow
  7. GRB 040827: RTT150 optical observations
  8. MASTER: GRB040827 possible OT
  9. GRB 040825B: Optical observations
  10. GRB040827 optical observations
  11. GRB 040827 - Refined position
  12. GRB040825B, BVRcIc field photometry
  13. GCN GRB OBSERBATION REPORT
  14. GRB040825B: optical observations
  15. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  16. GRB040825B: Correction to GCN 2657
  17. XRF040812: possible afterglow second Chandra observation
  18. GRB 040812: Second epoch CXO Observations
  19. XRF040812: GMRT observations
  20. XRF 040812: optical observation at VLT
  21. GRB 040812: Optical counterparts of CXO sources
  22. XRF040812: possible afterglow
  23. CXO observation of GRB 040812
  24. IPN/HETE localizations of GRB040810 (=H3489)
  25. GRB 040812: Keck and LCO optical observations
  26. GRB 040812: Keck and LCO observations
  27. GRB 040812: radio observations
  28. GRB040812, optical/IR observations
  29. XRF040701: Optical Observations at ESO
  30. IPN/HETE triangulation of GRB040802 (=H3485)
  31. GRB 040730, infrared observations
  32. GRB 040730: Optical observations
  33. Ongoing activity of SGR 1806-20
  34. GRB040624: optical monitoring at TNG
  35. XRF 040701 - optical observations of the decaying Chandra source
  36. XRF040701: Second-Epoch Chandra Observations
  37. XRF040701: VLA Observations
  38. XRF040701: Magellan Spectroscopy of Chandra Source #2 Associated Galaxy
  39. XRF040701: First-Epoch Chandra Observations
  40. GRB040709 J,H-band observations
  41. GRB040624, optical observations
  42. XRF 040701, optical observations
  43. GRB 040624: optical observations
  44. Optical Observations of GRB040624
  45. GRB 040624: optical observations at TNG and VLT
  46. GRB 040624: R-band observations
  47. GRB 040624, optical observations
  48. GRB 030329: Rebrightening of hyperluminal ejecta.
  49. IPN Summary of SGR1806-20 Activity in 2004
  50. GRB040511: Retraction of redshift identification
  51. SGR 1806-20: no IR variability of the proposed counterparts
  52. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  53. Activivty of SGR 1806-20
  54. GRB 040511, very fast decay?
  55. GRB 030324: Detection and Color of Host Galaxy
  56. GRB 040511: NIR observations with REM
  57. GRB040511: Redshift identifcation
  58. GRB 040511: Optical limit
  59. GRB040511: Candidate optical/NIR afterglow
  60. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  61. GRB 040511: Second Epoch Optical Observations
  62. GRB 040511: Optical observations
  63. GRB 040511: Optical Observations
  64. GRB040511: Optical Observations
  65. GRB040511: Optical Observations
  66. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  67. IPN triangulation of GRB040425 (=H3183)
  68. On Line Availability of Archival HETE Fregate Data and Lightcurves
  69. GRB040422, optical observations at Loiano
  70. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  71. GRB040422, BVRcIc field calibration
  72. GRB040422: optical and NIR observations at the VLT
  73. GRB 040403, deep optical observations
  74. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  75. GRB 040403: Optical Observations
  76. GRB 040403 Optical Observations
  77. GRB 040403: Optical observations
  78. GRB 040403: optical observations
  79. GRB 040403: Optical Observations
  80. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  81. GRB040323: NIR Observations and Variable Object
  82. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  83. GRB 040323, a dark GRB ?
  84. GRB040223: Deep NIR NTT data re-analysis
  85. GRB 040223: XMM-Newton results
  86. GRB040223, improved XMM position
  87. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  88. GRB 031203, possible supernova
  89. IBAS results on a burst from SGR1806-20
  90. GRB 040228 Optical observations
  91. IPN triangulation of GRB040228 (H3066, H3067)
  92. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  93. GRB 040223: Deep NIR NTT observations
  94. GRB 040223 : Optical observation (non-detection)
  95. XMM-Newton Images of GRB 040223
  96. GRB 040223, VLA observations
  97. GRB 040223: REM IJK Observations
  98. GRB 040223 XMM-Newton observation ...
  99. GRB 031203 XMM-Newton observation
  100. GRB031111, optical observations

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