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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"

28232 results found.

  1. XRF040912, BVRcIc field calibration
  2. XRF040916, BVRcIc field calibration
  3. GRB040916: Archival optical observations
  4. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  5. GRB040916: Optical observations
  6. GRB040912 (= H3557): Chandra Observations Scheduled
  7. GRB 040912: Optical Observations
  8. GRB/XRF040912,optical observations
  9. GRB 040912, BVRI observations
  10. Optical observations of field of GRB040912
  11. HETE 3557: Optical observations
  12. GRB040903 - A XRF?
  13. GRB040827: analysis of the XMM-Newton observation
  14. GRB040903, REM near-IR observation
  15. Very bright burst detected from SGR 1806-20
  16. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  17. Possible GRB 040903 - further analysis
  18. GRB 040827 - Radio Observations
  19. XMM-Newton Images of GRB 040827
  20. GRB 040827: optical and NIR observations at the VLT
  21. GRB 040827: UKIRT - 2nd epoch K-band imaging
  22. GRB 040827: 2nd epoch of Magellan K-band imaging
  23. GRB 040827: K imaging - no evidence of variability
  24. GRB 040827: Detection of NIR afterglow
  25. GRB040827 XMM-Newton observation
  26. GRB040825A: optical limit before GRB
  27. GRB 040825B: Optical observations
  28. GRB 040827 : Planned XMM-Newton observation
  29. GRB040825B, BVRcIc field photometry
  30. GRB040825A, BVRcIc field photometry
  31. GCN GRB OBSERBATION REPORT
  32. GRB 040825A,optical observations
  33. GRB040825A: optical observations
  34. GRB040825B: optical observations
  35. MASTER: GRB040825b optical observation
  36. GRB 040825: Optical observations
  37. XRF040812: possible afterglow second Chandra observation
  38. GRB 040812: Second epoch CXO Observations
  39. GRB040823,optical observation
  40. XRF040812: GMRT observations
  41. XRF 040812: optical observation at VLT
  42. GRB 040812: Optical counterparts of CXO sources
  43. XRF040812: possible afterglow
  44. CXO observation of GRB 040812
  45. GRB 040812: radio observations
  46. GRB040812, optical/IR observations
  47. GRB 040812: a long GRB detected by INTEGRAL
  48. XRF040701: Optical Observations at ESO
  49. GRB 040730, infrared observations
  50. GRB 040730: a long GRB detected with INTEGRAL
  51. Ongoing activity of SGR 1806-20
  52. GRB040624: optical monitoring at TNG
  53. XRF 040701 - optical observations of the decaying Chandra source
  54. XRF040701: Second-Epoch Chandra Observations
  55. XRF040701: VLA Observations
  56. XRF040701: First-Epoch Chandra Observations
  57. GRB040624, optical observations
  58. GRB040706:observation at University of Miyazaki
  59. Optical Observations of GRB040624
  60. GRB 040624: optical observations at TNG and VLT
  61. MASTER: GRB 040624 optical observation after 0,48d
  62. GRB 040624, optical observations
  63. GRB 040624 - A long GRB detected with INTEGRAL
  64. GRB 030329: Rebrightening of hyperluminal ejecta.
  65. IPN Summary of SGR1806-20 Activity in 2004
  66. SGR 1806-20: no IR variability of the proposed counterparts
  67. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  68. SGR 1806-20, potential NIR counterpart
  69. GRB 040606: Optical observations
  70. MASTER: HETE Alert 3274 optical observation
  71. Activivty of SGR 1806-20
  72. GRB 040511, very fast decay?
  73. GRB 030324: Detection and Color of Host Galaxy
  74. GRB 040511: NIR observations with REM
  75. GRB040511: Candidate optical/NIR afterglow
  76. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  77. GRB 040511: Second Epoch Optical Observations
  78. GRB 040511: Optical observations
  79. GRB 040511: Optical Observations
  80. GRB040511: Optical Observations
  81. GRB040511: Optical Observations
  82. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  83. GRB 040423 (=H3175): A Long GRB Localized by HETE
  84. GRB040422 : I-band follow-up observation at Lulin Observatory
  85. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  86. GRB040422, BVRcIc field calibration
  87. GRB 040422,optical observation
  88. GRB 040422: a long GRB detected with INTEGRAL
  89. GRB 040403, deep optical observations
  90. MASTER: HETE Alert 3163, 3167 technical optical observation
  91. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  92. GRB 040403: Optical observations
  93. GRB 040403: a long GRB detected with INTEGRAL
  94. GRB040323: NIR Observations and Variable Object
  95. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  96. GRB 040323, a dark GRB ?
  97. GRB 040323: a long GRB detected with INTEGRAL
  98. GRB040223: Deep NIR NTT data re-analysis
  99. GRB 040223: XMM-Newton results
  100. GRB040223, improved XMM position

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