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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"

12318 results found.

  1. GRB030329: RTT150 optical observations and upper limit for a host
  2. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  3. GRB030329: RTT150 optical observations and upper limit for a host
  4. GRB030329 observed as a sudden ionospheric disturbance (SID)
  5. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  6. GRB030418: Upper limits from recent and historical observations.
  7. GRB030329: HET spectroscopic monitoring
  8. GRB030328: R upper limit after 6 hours by MASTER
  9. GRB 030329: Light curve observed during the change of its slope.
  10. GRB 030329: Optical pre-Imaging
  11. GRB 030329: Upper limit from 5.6 hours before trigger
  12. GRB030329: Upper limits from recent and historical observations.
  13. RXTE detection of GRB 030329 afterglow
  14. GRB 030328: OT photometry
  15. GRB030323: Upper limits from recent and historical observations.
  16. IPN upper limit to a GRB associated with SN2003L
  17. GRB 030227: Optical limit at RIKEN
  18. GRB030226: Analysis of Chandra data
  19. GRB030227: Kiso optical upper limit
  20. GRB 030226: R band polarimetric observations
  21. GRB 20030226: Upper limits from recent and historical observations
  22. GRB 030226 simultaneous optical observations
  23. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  24. GRB030115 submm upper limit
  25. GRB 030115, simultaneous observations by BOOTES-1
  26. GRB 021211: R-band observations at late-time
  27. GRB021211, radio observations
  28. GRB021211: APO optical observations
  29. SUB-MM SEARCH FOR GRB 021211
  30. GRB 021211 Milagro GeV/TeV Observations
  31. GRB021211 - Upper limits from recent and historical observations
  32. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  33. GRB 021201: BOOTES simultaneous optical observations
  34. GRB 021004 submm observations
  35. GRB 021004 submm observations
  36. GRB 021004 - Unusual Radio-to-Submm Spectrum
  37. GRB021004: not fading anymore?
  38. GRB 021004: polarimetric observations
  39. IRAM Millimeter detection of GRB 021004
  40. GRB 021004: Optical observations at RIKEN
  41. GRB021004: Upper limits from recent and historical observations
  42. GRB 020813 multiband optical observations
  43. GRB 020625, optical observations
  44. AXP 1E2259+586: quasi-simultaneous optical observation
  45. GRB 020531, INT+WFC deep optical upper limits
  46. GRB 020531, simultaneous optical observations
  47. GRB 020418, optical/near-IR observations
  48. GRB020531: Upper Limit for Detection of Two TAROT Sources
  49. GRB020331: Optical Observations of Afterglow Candidate
  50. GRB011212: Optical Observations
  51. SN 2002ap - peak brightness date (SN/GRB?)
  52. GRB 020322: Optical Observations
  53. GRB 020305: Optical observations
  54. Type Ic SN2002bl (SN/GRB?) Radio Observations
  55. GRB020127: Further VLA Observations of Possible Counterparts
  56. IPN Upper Limits to a GRB Associated With SN2002ap
  57. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  58. GRB011212, Optical Observations
  59. Optical polarization observations for GRB011211
  60. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  61. GRB 011121: J-band observations
  62. GRB010921 - Milagro GeV/TeV Observations
  63. GRB 011121: HST Scheduled
  64. GRB 011030 R band observations
  65. GRB 011030 I-band Observation
  66. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  67. GRB010921, optical observations
  68. GRB000418: HST/STIS Second-epoch Observations
  69. GRB010214, optical observations
  70. SGR 1900+14, Chandra observations
  71. GRB 010222 - HEGRA GeV/TeV Observations
  72. GRB010220 optical obsercations
  73. Sub-millimeter Excess/GRB 010222
  74. GRB 010222
  75. GRB010220, Radio and Optical Observations
  76. GRB 010214: X-Ray afterglow
  77. Optical Observations of GRB 001018 at Keck
  78. GRB001120, optical observations
  79. GRB 001109: deep JHK upper limits
  80. GRB000630, Optical Observations
  81. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  82. GRB000210, Radio Observations
  83. GRB 991208, radio observations
  84. GRB991216 radio observations
  85. GRB991106: BeppoSAX/BATSE results
  86. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  87. GRB991014 BATSE Observations
  88. Infrared and Optical Observations of GRB990705
  89. GRB 990506, optical observations
  90. ASM/IPN error box for GRB 990308 (BATSE #7457)
  91. GRB990123, Optical observation
  92. GRB 990123: Continued Radio Observations
  93. GRB 990123: near-infrared observations.
  94. GRB990123: NIR Observation
  95. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  96. GRB 990123, new radio source
  97. GRB 981226: radio variable
  98. GRB981220, Correction to GCN 179
  99. GRB981220, Optical Observations
  100. GRB 981220 Optical observations

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