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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').
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"

16162 results found.

  1. GRB 030329: optical observations
  2. GRB 030329/SN 2003dh: Jitter Episode
  3. GRB 030528, Teramo optical observation
  4. GRB 030528 Bisei optical observation
  5. GRB030528 (H2724): A long GRB localized by HETE
  6. GRB 030329: Optical Observations
  7. GRB 030528: Optical observations at RIKEN
  8. GRB 030528 (=H2724) Kyoto optical observation
  9. GRB 030416: Optical Observations
  10. GRB 030329: optical photometry at various french observatories
  11. GRB 030329: optical photometry at Belesta observatory (France)
  12. GRB030329, Optical observations
  13. GRB 030329: HST ACS Observations of the Host
  14. GRB 030329 Optical Observations
  15. GRB030329: XMM-Newton observation
  16. GRB030324: Further Observations of the Candidate Optical Afterglow
  17. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  18. GRB 030418: Second Epoch Optical Observations with Magellan
  19. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  20. GRB 030329: Optical limit (contemporaneous imaging)
  21. GRB030329: RTT150 optical observations
  22. GRB030329, BVRI photometry
  23. GRB030429, refiend optical brightness
  24. GRB 030329: Optical limit (contemporaneous photography)
  25. GRB030418, BVRcIc field photometry
  26. GRB030429, BVRcIc field photometry
  27. GRB030429: RTT150 optical obs., correction to GCN 2208
  28. GRB 030329: High-Resolution Spectroscopy of the Host
  29. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  30. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  31. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  32. GRB030429: RTT150 optical observations, a possible host galaxy
  33. GRB030329: RTT150 optical observations and upper limit for a host
  34. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  35. GRB030501, optical observation
  36. GRB030501 observation report
  37. GRB030329: RTT150 optical observations and upper limit for a host
  38. GRB 030429: Radio Observations
  39. GRB 030429: redshift from VLT spectroscopy
  40. GRB 030329 Optical Observations
  41. GRB030328, optical observation
  42. GRB030429: Optical Observations
  43. GRB030501: TAROT candidate afterglow present in archival images
  44. GRB030429, possible optical counterpart
  45. GRB030425: CrAO optical observation
  46. GRB 030329 Oprical observations in Rozhen observatory
  47. GRB 030324: Radio Observations
  48. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  49. GRB030329, SPM optical observations (Correction)
  50. GRB030329, SPM optical observations
  51. GRB 030329: Spectral Evolution of SN 2003dh
  52. Optical Observations of GRB 030418 with Magellan
  53. GRB 030329: optical spectropolarimetry at VLT
  54. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  55. GRB030329: optical polarization
  56. GRB030329, optical observation
  57. ROTSE-III prompt optical detections of GRB 030418
  58. GRB030418: Upper limits from recent and historical observations.
  59. GRB 030418: Optical afterglow
  60. GRB 030418: Finder for afterglow candidate
  61. GRB 030418: Optical afterglow candidate
  62. GRB 030329 OT position
  63. GRB030329: Optical Observations
  64. GRB030329, UBVRI polarimetry, R-polarization
  65. GRB 030329: SARA Optical Observations
  66. OT GRB 030329: early spectrum
  67. GRB030324: Candidate Optical Afterglow (Erratum)
  68. GRB030324: Candidate Optical Afterglow
  69. GRB 030413: Optical Observations
  70. GRB 030329 Rc observations
  71. GRB030329, optical position
  72. GRB 030329 VLBA Observations
  73. GRB 030329, light curve flattens
  74. GRB 030329: VLT V-band photometry
  75. GRB030329: RTT150 optical observations
  76. GRB030329: Near Infrared Observations at Gunma
  77. GRB030329: HET spectroscopic monitoring
  78. Kiso observation of the GRB030329 at April 6
  79. GRB 030329, color evolution
  80. GRB030328, UBVRcIc field photometry
  81. GRB030329: Optical observcations
  82. GRB030329: BV photographic observations
  83. GRB 030329 Optical observations
  84. GRB 030329, color evolution
  85. GRB 030329: possible color change
  86. GRB030329: RTT150 optical observations
  87. GRB030329: Kiso B and R band observations
  88. GRB030329: RTT150 optical observation
  89. GRB 030329: SARA Optical Observations
  90. GRB 030329: SARA Optical Observations
  91. GRB030329: Optical observations
  92. SDSS 0.5m PT observations of GRB030329 (correction)
  93. SDSS 0.5m PT observations of GRB030329
  94. GRB 030329, Optical observations
  95. GRB030329, cessation of fading
  96. GRB030329: final R-band light curve by MASTER
  97. GRB 030329: SARA Optical Observations
  98. GRB 030329: SARA Optical Observations
  99. GRB030329, optical observation
  100. GRB030329, optical observation

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