TITLE:   GCN CIRCULAR
NUMBER:  29647
SUBJECT: INTEGRAL SPI-ACS on 2021-03-12 (04)11-08:15) are due to calibration activity
DATE:    21/03/12 08:42:05 GMT
FROM:    Carlo Ferrigno at IAAT/ISDC  <carlo.Ferrigno@unige.ch>

C. Ferrigno (ISDC/UniGE, Switzerland)

The INTEGRAL SPI-ACS undergoes a calibration phase each six month 
approximately. Due to technical issues,
the alert monitor was not switched off on 2021-03-12 from 4 to 8:20 UT. 
As a consequence, the series of alerts in this
time frame are of instrumental origin. We apologize for the disturbance 
this might have caused.